Exam Prep Practice Questions


Question 1

CHAP requires which of the following to be configured? [Choose the two best answers.]

  • A. Telnet

  • B. Virtual Private Networking

  • C. Username

  • D. The secret password on the router

  • E. PPP

A1:

Answer: C, E . CHAP requires PPP and the username to be configured to allow for authentication.

Question 2

Which ISDN command will bring up the second B channel when the first has reached a load of approximately 50 percent?

  • A. isdn load-balance 50

  • B. isdn dialer load-threshold 50

  • C. dialer load-threshold 125

  • D. load 50 start

A2:

Answer: C . The dialer load-threshold 125 command will bring up the second B channel when the first reaches approximately 50 percent load. The command will accept a value of 1 to 255, with 1 being the lowest load and 255 being 100 percent load.

Question 3

To verify all three layers of an ISDN circuit prior to dialing, an administrator should use which of the following commands?

  • A. show ppp multilink

  • B. debug ppp

  • C. debug bri

  • D. show run

  • E. show isdn status

A3:

Answer: E . The show isdn status command provides the connection status of all three layers, as well as calls in progress.

Question 4

Which of the following is a valid North American SPID?

  • A. 172.16.1.1

  • B. 800.555.1.002

  • C. 300.106

  • D. 5551002

  • E. 91655510020100

A4:

Answer: E . The SPID is the complete phone number, including the area code, plus a 4-digit value added to the 7-digit dialer number, without punctuation. Some service providers add an additional two digit prefix to the number. However, the only valid answer above would be E.

Question 5

If you have a newly configured router and an ISDN call succeeds, but pings and other packets fail, which of the following can be the cause? [Choose all that apply.]

  • A. CHAP misconfiguration

  • B. PPP is not enabled

  • C. Incorrect line speeds are configured

  • D. Static routes are incorrectly configured

  • E. A faulty cable

A5:

Answer: A, B, C , and D . All of these causes are possibilities and should be checked. E is incorrect, because if the cable were faulty, the call would not succeed.

Question 6

If an ISDN router will not dial, which of the following is the likely problem? [Choose all that apply.]

  • A. Misconfigured SPID

  • B. A dialer list filter

  • C. Incorrect switch type

  • D. Power problem

  • E. Misconfigured dialer map

  • F. All of the above

A6:

Answer: F . All of these are possible causes of why the router will not dial.

Question 7

Which of the following are advantages of using CHAP authentication? [Choose the two best answers.]

  • A. Password authentication

  • B. Password encryption

  • C. Compression and encryption of data packets

  • D. Virtual LANs are attached to ISDN switched connections

A7:

Answer: A, B . CHAP is used for password authentication, and encrypts the password for more secure connections.

Question 8

Which of the following two command prompts can execute the isdn switch-type command?

  • A. User mode command prompt

  • B. Privilege EXEC Mode command prompt

  • C. Global configuration mode command prompt

  • D. Interface configuration mode command prompt

A8:

Answer: C, D . You can use the isdn switch-type command in the global or interface configuration modes.

Question 9

ISDN Basic Rate Interface (BRI) provides which of the following?

  • A. Two 64Kbps B channels and one 16Kbps D channel

  • B. Total bit rate of up to 768Kbps

  • C. Two 56Kbps B channels for data

  • D. 10Mbps on two channels and a third for control using 192Kbps

A9:

Answer: A . ISDN BRI provides B channels for data (64Kbps each) and one D channel (16Kbps) for clocking and control.

Question 10

Which one of the following ISDN-specific protocols is used to establish a Layer 2 connection?

  • A. q.921

  • B. PPP

  • C. CHAP

  • D. q.931

  • E. Ethernet

A10:

Answer: A . The q.921 protocol is used for Layer 2 connections. CHAP and PPP are not specific to ISDN. Ethernet is a Layer 1 topology, and q.931 is used for call connection establishment at Layer 3.

Question 11

On certain routers, if the switch type is unknown, which one of the following commands should you use?

  • A. isdn switch-type 0

  • B. isdn auto switch-type

  • C. config switch-type auto

  • D. isdn switch-type all

  • E. isdn autodetect

A11:

Answer: E . The isdn autodetect command instructs the router to detect the switch type. The other commands are all invalid commands.



CCNP CIT Exam Cram 2 (642-831)
CCNP CIT Exam Cram 2 (Exam Cram 642-831)
ISBN: 0789730219
EAN: 2147483647
Year: 2003
Pages: 213
Authors: Sean Odom

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