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TestKing.640-875 (102Q)

Number: 640-875Passing Score: 800Time Limit: 120 minFile Version: 8.6


Cisco 640-875Building Cisco Service Provider Next-Generation Networks, Part 1 (SPNGN1)

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Sections1. IP Networks2. IPv4 and IPv6 Addressing3. Switched Network Technologies4. Routed Network Technologies5. IP Services6. Cisco Operating Systems and Platforms7. Transport Technologies8. Security in the Network9. Network Management10.Mix Questions


Exam A

QUESTION 1Which two commands can be used to enable LACP when configuring the interfaces for a 40 gigabit etherchannel? (Choose two.)

A. switch (config-if)# channel-group 1 mode activeB. switch (config-if)# channel-group 1 mode autoC. switch (config-if)# channel-group 1 mode desirableD. switch (config-if)# channel-group 1 mode passiveE. switch (config-if)# channel-group 1 mode LACP

Correct Answer: ADSection: Transport TechnologiesExplanation

Explanation/Reference:nice.

QUESTION 2Which two statements about Cisco IOS XR NTP configuration are true? (Choose two.)

A. A network device can obtain NTP time information in three ways: polling the NTP server, listening to NTP broadcasts, and listening to NTP multicasts.B. NTP authentication supports MD5, SHA1, or SHA2.C. Client mode is a peer-to-peer mode.D. The two types of poll-based NTP associations are client mode and symmetric active mode.E. The Cisco IOS-XR implementation of NTP supports stratum 1 service.F. In client mode, clients can dynamically learn the NTP sever IP address by listening to the NTP server broadcasts or multicasts.

Correct Answer: ADSection: Network ManagementExplanation

Explanation/Reference:Explanation:

QUESTION 3Refer to the exhibit.


Real 60Cisco 640-875 ExamA network administrator is setting up a new core router to be a secondary NTP server. What command would need to be added to NTP Client configuration shown?

A. NTP server 209.165.200.227 preferNTP server 209.165.200.226B. NTP server 209.165.200.227NTP server 209.165.200.226 secondaryC. NTP server 209.165.200.227 preferNTP server 209.165.200.226 backupD. NTP server 209.165.200.227NTP server 209.165.200.226 prefer

Correct Answer: ASection: Network ManagementExplanation

Explanation/Reference:good answer.



A new policy requires all configurations to be saved to flash and backed up to a TFTP server based off the hostname at 12:05am every day. Based upon theconfiguration, which two commands are required to accomplish this? (Choose two.)

A. kron occurrence daily-config-backup at 0:05 recurringpolicy-list backup-configB. kron occurrence daily-config-backup at 12:05 recurringpolicy-list backup-configC. kron policy-list backup-configcli write memorycli show running-config| redirect tftp://209.165.200.226/$h.cfgD. kron policy-list backup-configcli write memorycli show running-config| redirect tftp://209.165.200.226/$hostname.cfg

Correct Answer: ACSection: Network ManagementExplanation

Explanation/Reference:real answer.

QUESTION 5What is the measurement of the Cisco IP SLA Operation ICMP Pather Jitter?


A. Measures delay and jitter on networks utilizing UDP trafficB. Measures packet loss, jitter, and delay per hop in IP networks


C. Measures round-trip delay only in UDP traffic networksD. Measures IP networks-only round-trip delay

Correct Answer: BSection: Network ManagementExplanation

Explanation/Reference:valid answer.

QUESTION 6Which two commands are required to enter enable mode on a console port without entering a password? (Choose two.)

A. Privilege 15B. Input SSHC. Line VTY 0 4D. No loginE. Privilege 0

Correct Answer: ADSection: Network ManagementExplanation


QUESTION 7What is the Cisco recommended way to secure SNMPv2 community strings?

A. Configure complex community string names and avoid using default settingsB. Create multiple read/write strings to keep the attacker guessingC. Use access-lists to limit the amount of access to the community stringsD. Use SNMPv3 to limit the amount of memory overhead

Correct Answer: CSection: Network ManagementExplanation

Explanation/Reference:


Explanation:

QUESTION 8What is the Cisco IOS command to export IPv6 flows to Collector 209.165.200.200/24?

A. Switch(config)#ipv6 flow-export destination 209.165.200.200 9996B. Switch(config)#ip flow-export destination 209.165.200.200 9996C. Switch(config)#ip flow-export destination 209.165.200.200 255.255.255.0D. Switch(config)#ip flow-export destination fe08::0ABC:1 9996



QUESTION 9Which layer of the OSI Model does Label Distribution Protocol operate at?

A. Data LinkB. TransportC. ApplicationD. PresentationE. SessionF. Network



QUESTION 10A network engineer has been provided subnet 209.165.202.128/27. What is the last usable IP address in this network and what is the subnet mask?

A. 209.165.202.158 and 255.255.255.224B. 209.165.202.159 and 255.255.255.192


C. 209.165.202.158 and 255.255.255.192D. 209.165.202.128 and 255.255.255.192E. 209.165.202.128 and 255.255.255.224


Explanation/Reference:genuine answer.

QUESTION 11On Switch 5, which command would configure VLAN 5 as root?

A. switch5#spanning-tree vlan 5 priority 0B. switch5(config)#spanning-tree vlan 5 priority 61440C. switch5(config)#spanning-tree vlan 5 rootD. switch5(config)#spanning-tree vlan 5 priority 0E. switch5(config-if)#spanning-tree rootguard

Correct Answer: DSection: Network ManagementExplanation


QUESTION 12Which EIGRP feature in IOS, IOS-XE, and IOS-XR will prevent the EIGRP process from automatically forming a neighbor adjacency?

A. Access-listsB. Link speed and duplexC. MTU SizeD. Passive interfaceE. Bandwidth and delay

Correct Answer: DSection: Network Management


Explanation


QUESTION 13A Network Engineer configured NAT for external access but one individual at a time can access the external network. What NAT feature will allow all internaldevices to share the same NAT IP address?

A. Static mappingB. Overload featureC. NAT DHCP featureD. Default route statement



QUESTION 14Which command set is required to enable a remote SNMP query on an IOS-XR router?

A. control-planemanagement-planeinbandinterface allallow SNMPcommitB. control-planemanagement-planeinbandinterface allallow SNMPC. snmp server hostsnmp server contactsnmp-server community stringcommitD. snmp server hostsnmp server contactsnmp-server community string



QUESTION 15Which three statements correctly describe DSL-based Internet services for residential users? (Choose three.)


A. Most residential deployments use PPPoE encapsulation where the end user PC or the DSL CPE will require a PPP username and password configuration.B. Most residential deployments use PPPoA encapsulation where the DSL CPE device needs to provide Layer 3 routing functions.C. The most commonly installed DSL variant for residential deployments is ADSL.D. The most commonly installed DSL variant for residential deployments is SDSL.E. The most commonly installed DSL variant for residential deployments is HDSL.F. At the DSL service provider location, a DSLAM typically is used to terminate all the PPP connections of the DSL subscribers.G. At the DSL service provider location, a DSLAM is used to terminate and then aggregate the DSL connections over an ATM network.

Correct Answer: ACGSection: Mix QuestionsExplanation

Explanation/Reference:well explained answer.


Which layer(s) of the TCP/IP model operates end-to-end (Host A to Host B)?

A. Physical layerB. Link layerC. Transport and application layersD. Link and internet (network) layersE. Physical and link layers

Correct Answer: CSection: Mix QuestionsExplanation


QUESTION 17Which two applications require the network to have the least amount of jitter, delay, and packet loss? (Choose two.)


A. FTPB. SSHC. VoIPD. emailE. Cisco TelePresenceF. web browsing

Correct Answer: CESection: Mix QuestionsExplanation


QUESTION 18What is the default spanning-tree mode of an NNI port on a Cisco ME3400 switch?

A. Multiple spanning tree (mst)B. Per-vlan rapid spanning tree (rapid-pvst)C. Per-vlan spanning tree (pvst)D. IEEE 802.1D (stp)

Correct Answer: BSection: Mix QuestionsExplanation

Explanation/Reference:answer is specific.

QUESTION 19Which two statements about transparent bridging operations are true? (Choose two.)



A. A bridge builds its MAC address table dynamically using the spanning-tree protocol.B. A bridge operates at the data link layer.C. A bridge sends unknown unicast frames out on all ports except the incoming port.D. A bridge forwards traffic based on the destination IP address.E. All the ports on the bridge belong to the same collision domain.

Correct Answer: BCSection: Mix QuestionsExplanation




According to this show output, what are sticky MAC addresses?

Real 101Cisco 640-875 Exam

A. Dynamically learned MAC addresses on the port that are stored in the MAC address table and also in the start-up configurationB. Statically configured MAC addresses on the port that are stored in the MAC address tableC. Statically configured MAC addresses on the port that are stored in the start-up configurationD. Dynamically learned MAC addresses on the port that are stored in the running configuration

Correct Answer: DSection: Mix QuestionsExplanation


QUESTION 21Which two statements about NetFlow support on Cisco IOS XR are true? (Choose two.)

A. Cisco IOS XR supports NetFlow version 9 export format only.B. NetFlow version 9 is a flexible and extensible means to carry NetFlow records from a network node to a collector.C. IP flow is based on a set of four parameters only (source IP address, destination IP address, source port, and destination port).


D. A NetFlow flow is the bidirectional sequence of packets on a single interface.

Correct Answer: ABSection: Mix QuestionsExplanation

Explanation/Reference:answer is efficient.

QUESTION 22Using VLSM, how many /30 subnets can be derived from a single /27 Class C subnet?

A. 1B. 2C. 4D. 8E. 12F. 16


Explanation/Reference:answer is absolutely right.

QUESTION 23On Cisco IOS Switches, which port security violation mode results in frames from non-allowed MAC address being dropped, log message created, and SNMP trapsent?

A. ProtectB. RestrictC. ShutdownD. Err-disabledE. Log

Correct Answer: BSection: Mix Questions


Explanation


QUESTION 24Which statement about 10/40/100 GigabitEthernet interface configuration on Cisco IOS XR is true?

A. Use the negotiation auto command in interface configuration mode to enable link auto- negotiation to ensure that devices that share a link segment areautomatically configured with the highest performance.

B. The configuration supports only full-duplex operation.C. The range for MTU values is 64 bytes to 1518 bytes on the interface.D. The interface has no flow control configuration.



QUESTION 25Which statement about a root bridge in an STP domain is true?

A. It has the highest root ID in the STP domain.B. It has the lowest bridge ID in the STP domain.C. It contains non-designated ports.D. It contains root ports.E. It has the highest priority value.


Explanation/Reference:particular answer.

QUESTION 26Which Cisco IOS XR command displays traffic counters for an individual interface that is configured on the router?


A. RP/0/RSP0/CPU0:PE1(config)# show bundleB. RP/0/RSP0/CPU0:PE1# show interfaces GigabitEthernet 0/0/0/1C. RP/0/RSP0/CPU0:PE1# show controllers GigabitEthernet 0/0/0/1D. RP/0/RSP0/CPU0:PE1(admin)# show platformE. RP/0/RSP0/CPU0:PE1(admin)# show hw-module fpd location allF. RP/0/RSP0/CPU0:PE1# show interfaces brief


Explanation/Reference:Real 109

QUESTION 27

Select and Place:


Correct Answer:


Section: IP NetworksExplanation



QUESTION 28

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Correct Answer:


QUESTION 29

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QUESTION 30


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QUESTION 31

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QUESTION 32

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QUESTION 33

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Correct Answer:




QUESTION 34

Select and Place:


Correct Answer:

Section: IPv4 and IPv6 AddressingExplanation



QUESTION 35

Select and Place:

Correct Answer:


QUESTION 36

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QUESTION 37

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QUESTION 38Exhibit:

Select and Place:


Correct Answer:


Section: Switched Network TechnologiesExplanation


QUESTION 39


Hot Area:


Correct Answer:

Section: Network ManagementExplanation

Explanation/Reference:Routers d, f and g onlyCorrect network topology is Topology 2Use “show cdp neighbor” to check and determine the topology.

QUESTION 40

Select and Place:


Correct Answer:


Section: Mix QuestionsExplanation



QUESTION 41What is the term that refers to a device that has no Customer Equipment directly connected to it in a Service Provider network?

A. Provider Edge RouterB. Customer Edge RouterC. Non-customer Edge RouterD. Provider RouterE. Provider Edge Provider Router

Correct Answer: DSection: IP NetworksExplanation


QUESTION 42


Refer to the exhibit.

Host 3 on Network A is sending data to Host 8 on Network B. Which address is the default gateway of Host 3?

A. The address of the switch interface that is connected to router interface Fa0/0 Real 6Cisco 640-875 Exam

B. The address of the switch interface that is connected to router interface Fa0/1C. The address of the host that is connected to Network AD. The address of the host that is connected to Network BE. The address of the router interface Fa0/0F. The address of the router interface Fa0/1

Correct Answer: ESection: IP NetworksExplanation


QUESTION 43The PE and CE interfaces are in the UP/UP state. The junior Network Engineer has validated Layer 3 functionality by pinging the adjacent interface, however thecustomer is unable to access the provider network. What should be your next troubleshooting step?

A. Validate that the encapsulation method is utilizing Point-to-Point ProtocolB. Validate that the destination customer network is in the correct VRFC. Validate that the circuit clocking is inaccurate and needs to be synchronized on both sidesD. Check the physical connection between both devices to ensure stabilityE. Identify incorrect RADIUS configuration is present on the PE device


F. Check that an access-list is mis-configured on the loopback 0 interface and needs to be corrected

Correct Answer: BSection: IP NetworksExplanation


QUESTION 44What are two differences between WAN and LAN? (Choose two.)

A. The customer has explicit control of their own WAN.B. The customer can modify the service provider route distinguishers.C. The customer has explicit control of their LAN.D. The customer is aware of the infrastructure within the WAN.E. WANs will differ from LANs with attributes such as latency and distance.

Correct Answer: CESection: IP NetworksExplanation



QUESTION 45Which of the following correctly pairs the dotted decimal subnet mask with the correct number of binary bits that represent the subnet mask?

A. 255.255.255.192 and /25B. 255.255.255.248 and /28C. 255.255.255.224 and /26D. 255.255.255.248 and /27E. 255.255.255.240 and /28F. 255.255.255.240 and /16

Correct Answer: E




QUESTION 46What are two benefits of a star network topology? (Choose two.)

A. Disruption of the entire network is not required when adding new machines.B. Any problem which leaves the network inoperable can be traced to the central hub.C. This network type requires less cable as compared to linear bus topology.D. The performance of one of the numerous nodes cannot reflect on the performance of other nodes.E. The performance of the entire network is directly dependent on the performance of the hub.

Correct Answer: ABSection: IP NetworksExplanation

Explanation/Reference:to the point answer.

QUESTION 47You are having problems browsing to http://www.cisco.com from your laptop that is running Windows. Your laptop is connected directly to a default gateway, whichis a Cisco ISR G2 router. Which four options are the basic troubleshooting steps that you should use to troubleshoot this issue? (Choose four.)

A. Issue the ipconfig command from the Windows command line on your laptop to determine your laptop IP address and the default gateway IP address.B. Issue the ipconfig /all command from the Windows command line on your laptop to determine the DNS server IP address.C. Issue the ping {default gateway IP address} command from the Windows command line on your laptop to verify connectivity to the default gateway.D. Issue the ping {DNS server IP address} command from the Windows command line on your laptop to verify connectivity to the DNS server.E. Issue the ping tcp www.cisco.com 80 command from the Windows command line on your Real 10

Cisco 640-875 Examlaptop to verify TCP port 80 connectivity to the www.cisco.com server.

F. From the ISR G2 CLI, issue the ping tcp www.cisco.com 80 command to verify TCP port 80 connectivity to the www.cisco.com server.G. From the ISR G2 CLI, issue the ISR-G2#tracert www.cisco.com command to verify connectivity to the www.cisco.com server.H. From the ISR G2 CLI, issue the ISR-G2#nslookup www.cisco.com command to determine the IP address of the www.cisco.com server.

Correct Answer: ABCD



Explanation/Reference:excellent answer.

QUESTION 48Which statement about IPv6 global unicast addresses is true?

A. The first 3 bits is 001.B. The first 4 bits is 0011.C. The first 4 bits is 1111.D. The first 16 bits is FE80 in hex.E. The first 16 bits is FF00 in hex.F. The first 16 bits is 2002 in hex.G. The first 16 bits is 3FFE in hex.

Correct Answer: ASection: IPv4 and IPv6 AddressingExplanation


QUESTION 49


Select and Place:


Correct Answer:


Section: Routed Network TechnologiesExplanation



QUESTION 50


Correct Answer: Answer: Click on PE5:Section: Routed Network TechnologiesExplanation

Explanation/Reference:Config tInterface lo0ipv4 address 10.5.1.1/32ipv6 address 2001:db8:10:5:1::1/128commitinterface gi0/0/0/0no shutipv4 address 192.168.105.50/24ipv6 address 2001:db8:192:168:105::50/64


router eigrp 1address-family ipv4interface loopback0interface gi0/0/0/0address-family ipv6interface loopback0interface gi0/0/0/0commitVerify by pinging the ipv4 and ipv6 loopback IP addresses of CE5.

QUESTION 51

Select and Place:

Correct Answer:


Section: IP ServicesExplanation


QUESTION 52

Select and Place:


Correct Answer:


Section: IP ServicesExplanation


QUESTION 53

Select and Place:


Correct Answer:


Section: Cisco Operating Systems and PlatformsExplanation



QUESTION 54

Select and Place:


Correct Answer:


Section: Cisco Operating Systems and PlatformsExplanation



QUESTION 55Given the IP address of 209.168.200.155/27, which two options are the subnet that this IP address belongs to and the subnet broadcast IP address? (Choose two.)

A. 209.168.200.64 255.255.255.224B. 209.168.200.96 255.255.255.224C. 209.168.200.128 255.255.255.224D. 209.168.200.95E. 209.168.200.127F. 209.168.200.159

Correct Answer: CFSection: IPv4 and IPv6 AddressingExplanation

Explanation/Reference:appropriate answer.


QUESTION 56Which is a valid IPv6 Link Local address?

A. FF00::1B. 224.0.0.5::1C. FE80::1D. FE70::1E. 169.254.0.0/16

Correct Answer: CSection: IPv4 and IPv6 AddressingExplanation


QUESTION 57What is the size difference in bits between an IPv4 address and an IPv6 address?

A. 128B. 100C. 98D. 96E. 32

Correct Answer: DSection: IPv4 and IPv6 AddressingExplanation

Explanation/Reference:obvious answer.

QUESTION 58Given the subnet of 209.165.201.0/27, which subnet range will make the most efficient use of the address block for connecting to customer edge devices?

A. 209.165.201.1/32B. 209.165.201.1/31C. 209.165.201.1/30


D. 209.165.201.1/29E. 209.165.201.1/24

Correct Answer: BSection: IPv4 and IPv6 AddressingExplanation




Given the Class C IP network of 192.168.1.0, using VLSM, which five subnets meet the requirements in the exhibit? (Choose five.)

A. 192.168.1.0/27B. 192.168.1.32/27C. 192.168.1.48/27D. 192.168.1.48/28E. 192.168.1.64/28F. 192.168.1.80/28G. 192.168.1.80/29H. 192.168.1.88/30I. 192.168.1.96/30


Correct Answer: ABEFISection: IPv4 and IPv6 AddressingExplanation

Explanation/Reference:Answer: A,B,E,F,IExplanation:

QUESTION 60Which three statements about the ARP function are true? (Choose three.)

A. ARP is used to determine an IP address.B. An ARP request is broadcast at Layer 3.C. An ARP response is broadcast at Layer 2.D. ARP tables are maintained on Layer 3 devices.E. The destination MAC address of an ARP request is that of the ARP responder.F. ARP requests are broadcast at Layer 2.G. ARP resolves MAC addresses to NET addresses.H. ARP uses 0x0806 as the Type field in an Ethernet frame.

Correct Answer: DFHSection: Switched Network TechnologiesExplanation

Explanation/Reference:answer is justified.

QUESTION 61

Select and Place:


Correct Answer:

Section: Transport Technologies


Explanation


QUESTION 62

Select and Place:


Correct Answer:


Section: Transport TechnologiesExplanation



QUESTION 63


Hot Area:


Correct Answer:


Explanation/Reference:Gi0/0/0/2Correct network topology is Topology 2Use “show cdp neighbor” to check and determine the topology.

QUESTION 64


Hot Area:


Correct Answer:


Explanation/Reference:Fa0/21Correct network topology is Topology 2Use “show cdp neighbor” to check and determine the topology.

QUESTION 65When EIGRP is enabled on Cisco IOS XR, which EIGRP feature is on by default?

A. no auto-summaryB. stub routingC. unequal cost paths load-balancingD. no ip eigrp split-horizonE. eigrp authentication

Correct Answer: ASection: Routed Network TechnologiesExplanation

Explanation/Reference:suitable answer.




R1 and R2 are running RIPv1 for the 10.0.0.0 and 192.168.1.0 networks. No default or static routes have been configured on the routers. Which two statementsabout this topology are true? (Choose two.)

A. R1 summarizes the 10.1.1.0/24 subnet to 10.0.0.0/8 when it sends its RIPv1 routing updates to R2. R2 summarizes the 10.2.2.0/24 subnet to 10.0.0.0/8 when itsends its RIPv1 routing updates to R1.

B. To support this topology, R1 and R2 must be configured so that RIPv1 auto-summary is disabled.C. R1 sends information about the 10.1.1.0/24 subnet when it sends its RIPv1 routing updates to R2. R2 sends information about the 10.2.2.0/24 subnet when it

sends its RIPv1 routing updates to R1. Example of RIPv1 update from R1 to R2:RIP: build update entriesnetwork 10.1.1.0/24 metric 1D. Hosts on the 10.1.1.0/24 subnet are unable to communicate with hosts on the 10.2.2.0/24 subnet.E. R1 accepts the 10.2.2.0/24 RIPv1 routing updates from R2 and installs the 10.2.2.0/24 route in its routing table. R2 accepts the 10.1.1.0/24 RIPv1 routing

updates from R1 and installs the 10.1.1.0/24 route in its routing table.

Correct Answer: ADSection: Routed Network TechnologiesExplanation

Explanation/Reference:answer is correct.

QUESTION 67According to RFC 2080, which routing protocol is compatible with IPv6?

A. RIPv2B. OSPFC. RIP-NGD. EIGRPv6


E. OSPFv2F. EIGRP-NG

Correct Answer: CSection: Routed Network TechnologiesExplanation


QUESTION 68A customer uses OSPF as their Customer Edge routing protocol and remote sites are reporting 10.0.0.0/8 in the routing tables. What is most likely the mis-configuration in the redistribution?

A. Improper route summarization on CE routerB. Incorrect network statementC. Incorrect K value configuredD. Configuration missing subnets key wordE. Stub network is sending summarized routes

Correct Answer: DSection: Routed Network TechnologiesExplanation


QUESTION 69The network administrator is using a Windows PC application that is called putty.exe for remote communication to a switch for network troubleshooting. Which twoprotocols could be used during this communication? (Choose two).

A. SNMPB. HTTPC. TelnetD. RMONE. SSH

Correct Answer: CESection: Routed Network Technologies


Explanation

Explanation/Reference:sophisticated answer.

QUESTION 70With IPv6, for which purpose are router solicitation and router advertisement used?

A. Routing protocol updatesB. Routing protocol neighbor peeringsC. Router and prefix discoveryD. Layer 3 to Layer 2 address resolution (similar to IPv4 ARP)

Correct Answer: CSection: IP ServicesExplanation

Explanation/Reference:answer is great.

QUESTION 71Which Cisco IOS XR command presents a list of all interfaces, their Layer 3 address (if configured), and the status of the interface and protocol?

A. RP/0/RSP0/CPU0:PE1# show interface GigabitEthernet 0/0/0/1B. RP/0/RSP0/CPU0:PE1# show controllersC. RP/0/RSP0/CPU0:PE1(admin)# show hw-module fpd location allD. RP/0/RSP0/CPU0:PE1(config)# show bundleE. RP/0/RSP0/CPU0:PE1(admin)# show platformF. RP/0/RSP0/CPU0:PE1# show ipv4 interfaces brief

Correct Answer: FSection: Cisco Operating Systems and PlatformsExplanation

Explanation/Reference:most suitable answer.

QUESTION 72In Cisco IOS XR, which three operations is Admin mode used for? (Choose three.)


A. Secure Domain Router managementB. Configuration-register settingsC. Hostname configurationD. IOS XR software package upgradesE. Interface duplex settingsF. Domain-name configuration

Correct Answer: ABDSection: Cisco Operating Systems and PlatformsExplanation

Explanation/Reference:actual answer.

QUESTION 73Which Cisco IOS XR CLI command can you use to determine if the firmware on any of the line cards on the Cisco ASR 9000 Series Router needs to be upgraded?

A. RP/0/RSP0/CPU0:PE1#show platformB. RP/0/RSP0/CPU0:PE1(admin)#show platformC. RP/0/RSP0/CPU0:PE1#show hw-module fpd location allD. RP/0/RSP0/CPU0:PE1#show versionE. RP/0/RSP0/CPU0:PE1(admin)#show versionF. RP/0/RSP0/CPU0:PE1#show install active

Correct Answer: CSection: Cisco Operating Systems and PlatformsExplanation

Explanation/Reference:answer is complete.

QUESTION 74Which feature is used to protect the control plane of the router?



A. Port securityB. uRPFC. Routing protocol authenticationD. VRFE. SSHF. SSL

Correct Answer: CSection: Security in the NetworkExplanation

Explanation/Reference:answer is straight.

QUESTION 75Which statement about SSH is true?

A. It is a TCP/IP transport layer protocol.B. It uses TCP port number 22.C. It securely encrypts Telnet.D. It uses UDP port 23.E. Passwords are sent in clear text.F. It is an OSI network layer protocol.

Correct Answer: BSection: Security in the NetworkExplanation



agree with the answer.

QUESTION 76Which two statements are correct regarding routing protocol authentication? (Choose two.)

A. MD5 authentication can only be established between Internal BGP peers.B. Authentication can be established using keychains on one peer and MD5 hashing on the other.C. UDP port 179 is used for BGP session authentication.D. MD5 passwords are never sent to a peer.E. Routers authenticate each routing update packet received.F. BGP peers can be configured with different passwords.

Correct Answer: DESection: Security in the NetworkExplanation

Explanation/Reference:upgraded answer.

QUESTION 77Which three statements about the Cisco IOS XR task-based user authorization method are true? (Choose three.)

A. A user's association with a particular user group links that user to a particular set of task IDs. A user that is associated with a task ID can execute any operationassociated with that task ID.

B. Users can be assigned only to one user group.C. Every user group is associated with one or more task groups.D. Every task group is defined by a set of task IDs.E. Each user is assigned a privilege level.F. Each IOS XR CLI command is assigned a privilege level.G. A task ID maps the IOS XR command to a privilege level.

Correct Answer: ACDSection: Security in the NetworkExplanation



QUESTION 78What are the four steps to enable SSH v1 and v2 server on Cisco IOS XR routers? (Choose four.)

A. Configure a host name.B. Configure a domain name.C. Generate a crypto key pair.D. Import the router identity certificate and the CA root certificate to the router.E. Configure an ISAKMP policy.F. Bring up an SSH server using the ssh server command.

Correct Answer: ABCFSection: Mix QuestionsExplanation

Explanation/Reference:answer is sensual.

QUESTION 79Generally, which way is the fastest to open S3 and S4 service requests to the Cisco TAC?

A. Use the Smart Call Home feature.B. Use the online TAC Service Request Tool.C. Call Cisco TAC on the phone.D. Email Cisco TAC with a high-priority email.E. Export the related Syslog/NetFlow information to TAC directly.



QUESTION 80Which SNMPv2/SNMPv3 operation is not supported in Cisco IOS XR software?

A. get-bulkB. get-request


C. informD. trapE. set-request


Explanation/Reference:exact answer.

QUESTION 81What is the result of using the Cisco IOS copy tftp: run command?

A. The running configuration on the Cisco IOS device is backed up to the TFTP server.B. Only new configuration parameters from the saved configuration file on the TFTP server are added to the running configuration. No changes to any existing

configuration parameters in the running configuration are made.C. The running configuration on the Cisco IOS device is replaced with the saved configuration file on the TFTP server.D. The configuration stored in the TFTP server is merged with the running configuration on the Cisco IOS device.E. The saved configuration file from the TFTP server is copied to the target configuration.



QUESTION 82What is the SDH equivalent of the SONET STS-12 framing format?

A. SDH STM-1B. SDH STM-4C. SDH STM-12D. SDH STM-16E. SDH STM-64

Correct Answer: B


Section: Mix QuestionsExplanation

Explanation/Reference:rightful answer.

QUESTION 83What are the three RFC 1918 IPv4 private address ranges? (Choose three.)

A. 10.0.0.0 - 10.255.255.255B. 172.16.0.0 - 172.255.255.255C. 172.16.0.0 - 172.31.255.255D. 192.168.0.0 - 192.168.31.255E. 192.168.0.0 - 192.168.255.255

Correct Answer: ACESection: Mix QuestionsExplanation

Explanation/Reference:answer is complete.

QUESTION 84With a distance vector routing protocol like RIPv1, when is a route in the routing table placed in the "possibly down" state?

A. When a router receives an update from its neighbor router about a network in its routing table but with a worse metricB. When a router receives an update from its neighbor router about a network in its routing table but with a better metricC. When a router receives an update from its neighbor router indicating that a previously accessible network is now inaccessibleD. Whenever the router receives an update from its neighbor about a newly learned networkE. Whenever the router interface that is used to reach the remote network goes down



QUESTION 85


Given the CIDR address range of 200.165.160.0 to 200.165.191.255, what is the CIDR block?

A. 200.165.160.0/17B. 200.165.160.0/18C. 200.165.160.0/19D. 200.165.160.0/20E. 200.165.160.0/21



QUESTION 86Given these four Class B networks: 172.104.0.0, 172.105.0.0, 172.106.0.0, 172.107.0.0, what is the supernet (CIDR) address that summarizes these four Class Bnetworks?

A. 172.104.0.0/12B. 172.104.0.0/13C. 172.104.0.0/14D. 172.104.0.0/15



QUESTION 87What does a transparent LAN switch use to build its CAM table?

A. BPDU messages exchanged with neighbor bridgesB. STP messages exchanged with neighbor bridgesC. Dynamic routing protocol updates from neighbor bridgesD. Analysis of the source MAC address of incoming frames on the bridge ports





Using a single Class C network of 192.168.1.0/24 and VLSM, which two options specify the number of subnets that are needed to support this network and whatare the minimum sizes of the required subnets? (Choose two.)

A. 4 subnetsB. 6 subnetsC. 8 subnetsD. 26 subnetsE. 28 subnets


F. Two /30 subnets + one /28 subnets + one /29 subnetsG. Four /30 subnets + two /28 subnetsH. Six /30 subnets + two /28 subnetsI. Twenty six /30 subnetsJ. Twenty eight /30 subnets

Correct Answer: BGSection: Mix QuestionsExplanation

Explanation/Reference:good answer.

QUESTION 89Which option is enabled by default on Cisco IOS and IOS XE routers?

A. IPv6 unicast routingB. IPv4 unicast routingC. IPv6 and IPv4 unicast routingD. SSH serverE. HTTP serverF. SSH and HTTP serverG. AAA console login authentication


Explanation/Reference:authentic answer.

QUESTION 90On Cisco IOS XR, for which purpose is the turboboot procedure used?

A. To boot the router into ROM Monitor modeB. To install the IOS XR software from scratch using the ROM Monitor modeC. To install and boot up a PIED. To install and boot up a SMU


E. To perform an ISSUF. To speed up the time it takes to boot up the IOS XR router

Correct Answer: BSection: Cisco Operating Systems and PlatformsExplanation

Explanation/Reference:accurate.

QUESTION 91Which Cisco IOS XR CLI command displays the running state of each line card (including the fan tray) on the Cisco ASR 9000 Series Router?

A. RP/0/RSP0/CPU0:PE1#show platformB. RP/0/RSP0/CPU0:PE1(admin)#show platformC. RP/0/RSP0/CPU0:PE1#show hw-module fpd location allD. RP/0/RSP0/CPU0:PE1(admin)#show hw-module fpd location allE. RP/0/RSP0/CPU0:PE1#show versionF. RP/0/RSP0/CPU0:PE1(admin)#show version

Correct Answer: BSection: Cisco Operating Systems and PlatformsExplanation

Explanation/Reference:confirmed answer.

QUESTION 92Which three statements about Cisco IOS XR CLI operations are true? (Choose three.)

A. Cisco IOS XR uses a three-stage configuration method.B. Committed changes are persistent across reboots in Cisco IOS XR.C. The commit replace global configuration command replaces the contents of the running configuration with the target configuration.D. The save global configuration command saves the contents of target configuration to the running configuration.E. There is no concept of a startup-config in Cisco IOS XR.F. The clear global configuration command erases the entire current running configuration.G. The show running-config global configuration command displays the configuration that occurs if Real 43

Cisco 640-875 Exam


the contents of the uncommitted changed (target configuration) are committed to the running configuration.

Correct Answer: BCESection: Cisco Operating Systems and PlatformsExplanation


QUESTION 93Which two statements about Cisco IOS XE operations are true? (Choose two.)

A. Cisco IOS XE uses a two-stage configuration method.B. Using the commit global configuration command, all the committed changes will be persistent across reboots.C. The copy run start command makes the configuration changes persistent across reboots.D. The erase start command followed by the reboot command brings up the router without any configurations.E. There is no concept of a startup-config in Cisco IOS XE.

Correct Answer: CDSection: Cisco Operating Systems and PlatformsExplanation

Explanation/Reference:correct answer.

QUESTION 94Which Cisco IOS XR command is involved in enabling remote access?

A. RP/0/RSP0/CPU0:PE1(config)# router staticB. RP/0/RSP0/CPU0:PE1(config)# line console 0C. RP/0/RSP0/CPU0:PE1(config)# vrf defaultD. RP/0/RSP0/CPU0:PE1(config)# telnet ipv4 server max-servers 20E. RP/0/RSP0/CPU0:PE1(config)# username CISCO password LAB

Correct Answer: DSection: Cisco Operating Systems and PlatformsExplanation



selected answer is right.

QUESTION 95A network engineer has configured an interface with various commands including the no shutdown command on an IOS-XR device. Both sides of the interface havebeen validated and the cable has been tested. Which command does the network engineer need to input?

A. switch#copy running-configuration startup-configurationB. switch#commit configC. (config)#commitD. switch(config)#commit configE. switch#write memory

Correct Answer: CSection: Cisco Operating Systems and PlatformsExplanation


QUESTION 96Which component is integrated into the Cisco IPoDWDM interfaces?

A. ROADMB. transponderC. electrical cross connectD. E-O-E converterE. SONET/SDH controller

Correct Answer: BSection: Transport TechnologiesExplanation


QUESTION 97A Passive Optical Network is a point-to-multipoint FTTx network architecture that relies on which of the following?

A. Electrically powered optical splitters


B. Unpowered optical splitterC. Customer optical network terminalD. Network interface controller

Correct Answer: BSection: Transport TechnologiesExplanation

Explanation/Reference:true answer.




Based on the configurations shown, why is the serial link in up/down status?

A. Mismatch hostnamesB. Passwords are in plain textC. Mismatch of authentication typeD. Wrong configuration mode for command input

Correct Answer: CSection: Transport TechnologiesExplanation




Which statement about this show command output is true?

A. The S78 switch is performing remote-SPAN.B. All traffic that ports Fa0/1, Fa0/2, Fa0/3, and Fa0/4 send and receive is monitored.C. All traffic that port Gi0/1 sends and receives is monitored.D. The sniffer (network analyzer) should be connected to the Gi0/1 port.E. The SPAN destination interface replicates the source interface encapsulation method.

Correct Answer: DSection: Network ManagementExplanation

Explanation/Reference:defined answer.

QUESTION 100Which three statements about Cisco Discovery Protocol operations on a Cisco ME3400 switch are true? (Choose three.)

A. Cisco Discovery Protocol is enabled by default on NNI ports.B. Cisco Discovery Protocol is enabled by default on all NNI, ENI, and UNI ports.C. Cisco Discovery Protocol is disabled by default on ENI ports.


D. Cisco Discovery Protocol is not supported on NNI or ENI ports.E. Cisco Discovery Protocol is not supported on UNI ports.

Correct Answer: ACESection: Network ManagementExplanation

Explanation/Reference:finest answer.

QUESTION 101Currently, a Cisco IOS XR router is configured to send IP SLA probes to a network management station that is acting as the IP SLA target device. How can IP SLAmeasurement accuracy be improved and also provide additional statistics?

A. Use ICMP echo probes instead of UDP echo probes.B. Configure another Cisco router as the target and enable that other Cisco router for IP SLA Responder operations.C. Increase the rate (frequency) at which a specified IP SLA operation is sent into the network.D. Use UDP echo probes instead of ICMP echo probes and enable UDP echo service on the target network management station.E. Enable IP SLA Responder service on the target network management station.


Explanation/Reference:rightful.



Which three statements about this show output are true? (Choose three.)

A. Logging to the circular logging buffer has been disabled.B. All severity levels messages can be logged to the terminal lines other than the console.C. The logging facility has been set to "critical".D. Messages with Severity Levels 0, 1, and 2 are sent to the syslog server.E. 169 messages have been sent to the syslog server.



F. The logging buffer size is set to 8192 bytes.

Correct Answer: ABDSection: Network ManagementExplanation



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