978-0789759825 Chapter 7

CompTIA Network+ N10-007 Cert Guide

Chapter 7 Wide-Area Networks

1) The following image is an example of what type of WAN connection?

A) ISDN network, packet-switched connection

B) Frame Relay network, circuit-switched connection

C) Frame Relay network, packet-switched connection

D) ISDN network, circuit switched connection

2) The data rate for a T3 link is ________.

A) 45.736 Mbps to 51.84 Mbps

B) 44.736 Mbps to 52.84 Mbps

C) 44.736 Mbps

D) 40 Mbps to 50 Mbps

3) Which of the following are not examples of wireless media?

A) Cellular phone

B) LTE

C) HSPA+

D) DSL

4) A common Layer 2 protocol used on dedicated leased lines is ________.

A) PPP

B) CHAP

C) TCP/IP

D) IPsec

5) If the bandwidth of an OC-1 link is 51.84 Mbps, what is the bandwidth of an OC-3 link?

A) 155 Mbps

B) 51.84 Mbps

C) 155.52 Mbps

D) 1.54 Mbps

6) Which is not a primary feature offered by Link Control Protocol (LCP)?

A) Looped-link detection

B) Error detection

C) Authentication

D) Packet detection

7) A demarc is the point in a telephone network where the maintenance responsibility passes

from a telephone company to the subscriber (unless the subscriber has purchased inside wiring

maintenance).

8) MPLS inserts a 32-bit header between Layer 2 and Layer 3 headers. Because this header is

________ between the Layer 2 and Layer 3 headers, it is sometimes referred to as a(n) ________

header.

A) inserted, insert

B) added, addon

C) inserted, proxy

D) shimmed, shim

9) Asynchronous Transfer Mode (ATM), a cell-switched connection technology that uses 53-

byte fixed-length cells, is often categorized as a packet-switched connection technology.

10) Which of the following is a common Layer 2 protocol that could run over a dedicated leased

line?

A) Transmission Control Protocol (TCP)

B) Point-to-Point Protocol (PPP)

C) Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX)

D) Routing Information Protocol (RIP)

11) A service level agreement (SLA) is used to specify the specific performance metrics (for

example, available bandwidth and maximum delay) that are guaranteed for a service over a

certain percentage of time.

12) What are the two different supported frame formats that are used when deploying a T1 leased

line?

A) Super Frame

B) Extended Super Frame

C) Multi Frame

D) Distributed Frame

13) What is the name of the digital modem device that is used to terminate a T1 circuit?

A) SmartJack

B) Network interface

C) CSU/DSU

D) ESU

14) What are the two commonly available PPP authentication mechanisms?

A) PAP

B) RADIUS

C) TACACS+

D) CHAP

15) What is the name of the protocol that is commonly used to authenticate devices that connect

via DSL?

A) SLIP

B) PPPoE

C) PPP

D) ROAM

16) What is the maximum distance that an ADSL modem (client) can be from a provider’s

DSLAM?

A) 14,000 feet

B) 15,000 feet

C) 18,000 feet

D) 22,000 feet

17) What is the theoretical maximum downstream speed of ADSL?

A) 4 Mbps

B) 1.544 Mbps

C) 52 Mbps

D) 8 Mbps

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18) What is the name of the specification that indicates the frequencies that are dedicated for data

transmission over cable lines?

A) DOCSIS

B) EIA/TIA 568a

C) SONET

D) IEEE 802.6

19) What is the name of a device that can be connected to a T1 line and can convert frame

formats and support remote diagnostics?

A) NI

B) SmartJack

C) CSU/DSU

D) BERT

20) Which type of ISDN circuit provides 23 B channels and 1 D channel?

A) BRI

B) IDSL

C) PRI

D) SDSL

21) What is the point in a telephone network where the maintenance responsibility passes from a

telephone company to the subscriber?

A) Local loop

B) Demarc

C) Telco

D) Central office

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Answer: B

Explanation: A demarc (also known as a “demarcation point” or a “demarc extension”) is the

point in a telephone network where the maintenance responsibility passes from a telephone

company to the subscriber (unless the subscriber has purchased inside wiring maintenance). The

demarc is typically located in a box mounted to the outside of a customer’s building (for

example, a residential home).

Chapter: Chapter 7: Wide Area Networks (WANs)

Remediation: Plain Old Telephone Service

22) Which ISDN endpoint is a device (such as an ISDN phone) that natively supports ISDN?

A) R reference point

B) U reference point

C) Terminal endpoint 1 (TE1)

D) Network termination 1 (NT1)

23) Dynamic Multipoint VPN (DMVPN) is a Cisco technology that automates the creation of

VPN connections in a WAN topology. In what type of WAN topology is DMVPN most

commonly used?

A) Point to point

B) Ring

C) Full mesh

D) Hub and spoke

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Explanation: A popular method of implementation for overlay networks today is the Dynamic

Multipoint VPN (DMVPN). This Cisco invention has the ability to automate the creation of VPN

connections in a WAN topology. While DMVPN can technically be used in any layout, it is most

often seen implemented with the popular hub-and-spoke (partial mesh) WAN topology.

Chapter: Chapter 7: Wide Area Networks (WANs)

Remediation: Overlay Networks

24) Optical carrier (OC) links can carry speeds far faster than more traditional WAN

technologies. What is the bandwidth of an OC-192 connection?

A) 51.48Mbps

B) 192Mbps

C) 622.08Gbps

D) 2.4Gbps

E) 9.6Gbps

25) A ______ ______ allows Internet telephony service providers to deliver telephony services

and unified communications applications offering voice, video, and other streaming media

applications such as desktop sharing, web conferencing, and shared whiteboard technologies.

A) CSU DSU

B) SIP trunk

C) Multilink interface

D) Multilayer switch

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Explanation: A SIP trunk allows Internet telephony service providers (ITSPs) to deliver

telephone services and unified communications to customers equipped with SIP-based private

branch exchange (IP-PBX) and unified communications facilities. Most unified communications

applications offer voice, video, and other streaming media applications such as desktop sharing,

web conferencing, and shared whiteboard technologies.

Chapter: Chapter 7: Wide Area Networks (WANs)

Remediation: SIP Trunk