chapter 4 dns
DESCRIPTION
Windows Server 2008 Network Infrastructure Chapter 4 DNSMatching DefinitionsTRANSCRIPT
Ch4
Dns benefits:
Scalability- Because dns is capable of distributing workload across several databases or computers, it can scale to handle any level of name resolutions reqired.
Constancy-Hostnames Remain constant
Ease of Use-Users Access computers using easy to remember names such as www.microsoft.com rather than a numerical ip addresss.
Simplicity- users need to learn only on naming convention to find resources on either the internet or intranet.
Caching server hosts no zones
Standard zone-text based zone file
Filebacked zone
Three types of zones
-primary
-secondary
-stub
Standard primary zone- hosts a read/write copy of the dns zone in which resource records are created and managed. Only one server can host and load the master copy of the zone; no additional primary servers for the zone are permitted and only the server hosting the primary zone is allowed to accept dynamic updates and process.
Standard secondary zone- a copy of the zone file may be stored on one or more servers to balance network load, provide falut tolerance or avoid forcing queries across slow, wan link.is a read only copy of standard primary dns zone.
Fullzone transfer (axfr)= entire contents of the zone is copied form the primary server to the secondary server during each zone transfer.
Incremental zone transfer(ixfr)-in which only changed info is transmitted after an initial axfr. In order to cut down on bandwidth usage.
Reverse lookup-196.158.63.2 = www.helloworld.net
Stub zone-contains only those resources records necessary to identify the authorative
Storing a zone benefits=
1. Fault tolerance
2. Security
3. Zones are multimaster
4. Efficient replication
5. Maintain use of 2ndary zones
Dacl(distortionary access control list)- enables you to specify which users and groups may modify the dns zones.
3 replication scopes ways:
-to all dc in the domain.
-To all dc that are dns servers in the local domain. Aka domain dns zones application partition
-to all dc that are also dns servers in the entire forest also known as forest dns zones application.
*The following events triggers zone transfers:
1. A transfer is manually imitated using the console at the secondary server.
2. Zone refreshed interval expires
3. Dns server service is started at he secondary server
4. The master server notifies the secondary server of a zone change or changes.
Question 1
1 out of 1 points
To conserve disk space, DNS servers store only the most recent updates.Answer
Selected Answer: True
Correct Answer: True
Question 2
0 out of 1 points
The primary DNS server for a zone is not required to perform an incremental zone transfer.Answer
Selected Answer: False
Correct Answer: True
Question 3
1 out of 1 points
For replication of Active Directory–integrated zones, DNS notification is needed.Answer
Selected Answer: False
Correct Answer: False
Question 4
0 out of 1 points
Scavenging is enabled by default.Answer
Selected Answer: True
Correct Answer: False
Question 5
1 out of 1 points
As long as the TTL for a cached resource record does not expire, a DNS server can continue to cache and use the resource record again when answering queries by its clients that match these resource records.Answer
Selected Answer: True
Correct Answer: True
Question 6
0 out of 1 points
In a Windows Server 2008 network, the primary means of locating network devices and network services is through the use of __________.Answer
Selected Answer:TCP/IP
Correct Answer:DNS
Question 7
0 out of 1 points
In what year was DNS introduced?Answer
Selected Answer:1983
Correct Answer:1984
Question 8
0 out of 1 points
Which of the following is not considered a top-level domain?Answer
Selected Answer:
coop
Correct Answer:.nato
Question 9
1 out of 1 points
What type of zone might a DNS server host?Answer
Selected Answer:primary
Correct Answer:primary
Question 10
1 out of 1 points
Which of the following is not a forward or reverse lookup zone type?Answer
Selected Answer:integrated
Correct Answer:integrated
Question 11
1 out of 1 points
Which zone hosts a read/write copy of the DNS zone in which resource records are created and managed?Answer
Selected Answer:standard primary zone
Correct Answer:standard primary zone
Question 12
0 out of 1 points
Which zone is a copy of a zone that contains only those resource records necessary to identify the authoritative DNS servers for that zone?Answer
Selected Answer:standard secondary zone
Correct Answer:stub zone
Question 13
1 out of 1 points
Which zone enables a host to determine another host’s name based on its IP address?Answer
Selected Answer:reverse lookup zone
Correct Answer:reverse lookup zone
Question 14
0 out of 1 points
What are two types of Active Directory–integrated zones?Answer
Selected Answer:standard and secondary
Correct Answer:forward and reverse
Question 15
1 out of 1 points
Active Directory–integrated zones follow what type of update model?Answer
Selected Answer:multimaster
Correct Answer:multimaster
Question 16
0 out of 1 points
Where are zone transfers initiated?Answer
Selected Answer:stub server
Correct Answer:secondary server
Question 17
1 out of 1 points
Which operating system does not support zone transfers?Answer
Selected Answer:Windows NT
Correct Answer:Windows NT
Question 18
1 out of 1 points
DNS zone file resource records are represented as __________.Answer
Selected Answer:text entries
Correct Answer:text entries
Question 19
1 out of 1 points
Which of the following is a 32-bit integer representing the maximum time, in seconds, that a DNS server or client caches this resource record before it is discarded?Answer
Selected Answer:TTL
Correct Answer:TTL
Question 20
0 out of 1 points
After sending a zone transfer request, which option shows how long (in seconds) the zone’s secondary server waits before sending another request?Answer
Selected Answer:Minimum TTL
Correct Answer:Retry
Question 21
0 out of 1 points
What is the length of time that the DNS service waits before retrying a query made during a recursive lookup?Answer
Selected Answer:5 seconds
Correct Answer:3 seconds
Question 22
0 out of 1 points
What is the length of time that the DNS service waits before failing a recursive lookup that has been retried?Answer
Selected Answer:7 seconds
Correct Answer:15 seconds
Question 23
0 out of 1 points
A conditional forwarder in an Active Directory environment can be replicated to any of the following except all __________.Answer
Selected Answer:DNS servers in the forest
Correct Answer:domain controllers in the forest
Question 24
1 out of 1 points
You can use the DNS console to manually or automatically test DNS servers by submitting all of the following queries __________.Answer
Selected Answer:both B and C
Correct Answer:both B and C
Question 25
1 out of 1 points
Nslookup can be used for which of the following?Answer
Selected Answer:all of the above
Correct Answer:all of the above
Question 26
8 out of 10 points
Match description to technology name.Answer
QuestionCorrect Match
Selected Match
A DNS zone stored in Active Directory can take advantage of increased security by modifying its __________ access control list.
B.discretionary
B.discretionary
An Active Directoryintegrated __________ lookup zone is used for resolving an IP address to a name and is similar to the standard in-addr.arpa zone.
E.reverse
E.reverse
A DNS server on a network is designated as a(n) __________ by having the other DNS servers in the network forward the queries they cannot resolve locally to that DNS server.
I.forwarder
I.forwarder
__________ forwarding enables a DNS server to forward queries to other DNS servers based on the DNS domain names in the queries.
A.Conditional
A.Conditional
The __________ command uses the local server to get the address of the server to which it must switch.
G.lserver
G.lserver
__________ is provided as a built-in command-line tool for managing DNS servers in Windows Server 2008.
C.
Dnscmd
D.dnscmd
DNS round __________ is a load-balancing mechanism used by DNS servers to share and distribute network resource loads.
J.robin
J.robin
The process of mapping an IP address to a computer name is called name __________.
H.resolution
H.resolution
You can add additional NS records by using DNS Manager or the __________ command-line tool.
D.dnscmd
C.
Dnscmd
When you are in interactive mode, you can also use the __________ command to configure Nslookup options that determine how the resolver carries out queries.
F.Set
F.Set
Question 27
8 out of 8 points
Match the description to the terminology.Answer
Question Correct Match Selected Match
What is a hierarchical, tree-structured list of DNS host names, starting at an unnamed root that is used for all DNS operations?
G.
DNS namespace
G.
DNS namespace
What is a read-only copy of the standard primary DNS zone?
C.standard secondary zone
C.standard secondary zone
What are zones that are stored in Active Directory referred to as?
A.
Active Directory–integrated zones
A.
Active Directory–integrated zones
What is the complete or partial transfer of all data in a zone from the primary DNS server hosting the zone to a secondary DNS server hosting a copy of the zone?
H.
zone transfer
H.
zone transfer
What is an update to the original DNS protocol specification that permits a means of initiating notification to secondary servers when zone changes occur?
B.
DNS Notify
B.
DNS Notify
What resource record indicates the starting point or original point of authority for information stored in a zone?
D.
SOA
D.
SOA
What type of resource record specifies a server that is willing to act as a mail server for a DNS name?
E.MX
E.MX
What resource records enable you to specify the location of servers that provide a specific network service over a specific protocol and in a specific domain?
F.SRV
F.SR