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8/13/2019 CIT212

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Assessment Results

Item Feedback Report

CCNA Exploration: Accessing the WAN (Version 4.0) - EWAN

Chapter 1

Below is the feedback on items for which you did not receive full credit. Some interactive items may not display yourresponse.

Subscore: Domain Know ledge - Weighted Score

1 At which two layers of the OSI model does a (Choose two.)

Correct

Response

Your

Response

Physical Layer

Data Link Layer

Network Layer

Transport Layer

Presentation Layer

Application Layer

This item references content from the followingareas:CCNA Exploration: Accessing the WAN

1.2.1 WAN Technology Overview

2 Which three WAN devices can be found in the cloud? (Choose t

Correct Response

Your Response

ATM switches

core routers

CSU/DSU

Ethernet switches

Frame Relay switches

repeaters

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1.2.1 WAN Technology Overview

3 Which networking device is typically used to concentratethe dial-in and dial-out traffic of multiple users to and froma network?

Correct Response

Your Response

core router

access server

Frame Relay switch

ATM switch


1.2.2 WAN Physical Layer Concepts

4 Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data, voice,and video all on the same infrastructure?

Correct Response

Your Response

Time Division Multiplexing (TDM)

metro Ethernet

Integrated Services Digital Network (ISDN)

Public Switched Telephone Network (PSTN)


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1.3.5 Internet Connection Options

5 Which two features are identified with Frame Relayconnections? (Choose two.)

Correct Response

Your Response

53-byte cells

DLCI

DSLAM

PVC

SPID

This item references content from the following areas:CCNA Exploration: Accessing the WAN

1.3.4 Packet Swtiched Connection Options

6 Which WAN technology uses a fixed payload of 48 bytesand is transported across both switched and permanent

virtual circuits?Correct Response

Your Response

ATM

ISDN

Frame Relay

metro Ethernet

This item references content from the following areas:

CCNA Exploration: Accessing the WAN


7 What are two advantages of an analog PSTN WANconnection? (Choose two.)

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Correct Response

Your Response

low cost

availability

traffic encryption

available bandwidth

support for voice and video


1.3.3 Circuit Switched Connection Options

8 What three terms are associated with ISDN PRI?(Choose three.)

Correct Response

Your Response

cell

DLCI

circuit switching

packet switching

data bearer channels

time-division multiplexing



9 What can cause a reduction in available bandwidth on acable broadband connection?

Correct Response

Your Response

smaller cells

number of subscribers

committed information rate

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distance from the central office of the provider



10 What type of connectivity is established when VPNs areused from the remote site to the private network?

Correct Response

Your Response

PVCs

DLCIs

tunnels

dedicated Layer 2 links



11 A U.S. company requires a WAN connection used only totransfer sales data from individual stores to the homeoffice. All transfers will occur after business hours. Therequired bandwidth for this connection is estimated to beless than 38 kbps. Which type of connection requires theleast investment for this company?

Correct Response

Your Response

ATM

ISDN

analog dialup

T1 Leased Line


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12 For digital lines, which device is used to establish thecommunications link between the customer equipmentand the local loop?

Correct Response

Your Response

CSU/DSU

Frame Relay switch

ISDN switch

modem

PBX switch



13 Which term describes a device that will put data on thelocal loop?

Correct Response

Your Response

DLCI

DTE

DCE

BRI

PRI



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14 Which switching type will allow the communication devicesin the provider network to be shared and only allocated toan individual subscriber during data transfer?

Correct

Response

Your

Response

circuit-switched

dedicated switched lines

frame-switched

packet-switched


1.2.4 WAN Switching Concepts

15 A company needs a WAN connection that is capable oftransferring voice, video, and data at a minimum data rateof 155 Mbps. Which WAN connection is the best choice?

Correct Response

Your Response

X.25

DSL

ATM

ISDN BRI

ISDN PRI



16 Which two devices are commonly used as datacommunications equipment? (Choose two.)

Correct Response

Your Response

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modem

router

CSU/DSU

ISDN switch

Ethernet switch



17 Which statement is true of the functionality of the layers inthe hierarchical network model?

Correct Response

Your Response

The purpose of the access layer is to provide very high bandwidthcommunications between network devices.

Most security screening to prevent unauthorized entry to the networkhappens at the core layer.

Untrusted external connections are segmented from the rest of thenetwork at all three levels.

The distribution layer aggregates WAN connections at the edge ofthe campus.


1.1.3 The Evolving Network Model

18 Which statement is true about data connectivity between acustomer and a service provider?

Correct Response

Your Response

Normally the CSU/DSU is the designated demarcation point for theservice provider but not the customer.

The segment between the demarcation point and the central office isknown as the "last mile."

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The local loop is the segment between the CSU/DSU and the serial

port on a router.

Putting data on the local loop is the responsibility of the DTE.



19 Which statement is true about the differences between aWAN and a LAN?

Correct Response

Your Response

WANs generally support higher bandwidth than LANs support.

A WAN link typically traverses shorter geographic distances than aLAN link traverses.

A WAN often relies on the services of carriers, such as telephone orcable companies, but a LAN does not.

All WAN implementations generally use the same Layer 2 protocolbut there are many accepted LAN Layer 2 protocols in use.



1.1.1 Introducing Wide Area Networks (WANs)

20 Why is the call setup time of a circuit-switched WANimplementation considered a drawback?

Correct Response

Your Response

Routing protocols are incompatible with this function.

It restricts the communication sent to voice traffic only.

A telephone must be used to initially start transferring data.

Data cannot be transferred until a circuit has been established.

This item references content from the followingareas:

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21 Which statement about WAN protocols is correct?

Correct Response

Your Response

ATM differs from other WAN protocols in that it uses variably sizedpackets.

Most WAN protocols use HDLC or a variant of HDLC as a framingmechanism.

The frame header consists of the frame check sequence and cyclicredundancy check.

ISDN differs from Frame Relay, HDLC, and ATM in that it is packet-switched rather than circuit-switched technology.


1.2.3 WAN Data Link Layer Concepts

22 What is an advantage of packet-switched technology over

circuit-switched technology?

Correct Response

Your Response

Packet-switched networks are less susceptible to jitter than circuit-switched networks are.

Packet-switched networks can efficiently use multiple routes inside aservice provider network.

Packet-switched networks do not require an expensive permanentconnection to each endpoint.

Packet-switched networks usually experience lower latency than

circuit-switched networks experience.



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