470
Chapter 8
Troubleshooting ISDN
Answers to Review Questions
1.
C. q.931 runs on the D channel and is located at Layer 3.
2.
C. While D and E are partially correct, the BRI includes both B channels
and the D channel.
3.
D. More information is needed before the switch-type is configured.
4.
B, C. PPP is required for CHAP to work on ISDN. Usernames must be
defined on the routers for authentication purposes. The other options
are not required for proper CHAP operation.
5.
B. The subnet mask indicates only two hosts on the network. The only
other host allowed is 192.168.10.2.
6.
B, D. A faulty cable can be eliminated because the call would not suc-
ceed if there were a cable fault. Speeds are default.
7.
A, B, C, D. Any of these can be cause of the router not dialing.
8.
C. The interface must be specified to clear the call.
9.
A, D. CHAP was intended for password authentication and encryption.
10.
A. The correct syntax requires a hyphen.
11.
B. PPP is a required protocol for CHAP to function.
12.
B. One B channel may be used without the use of the other. The D
channel must be active to handle the call.
13.
B. The controller command shows the superframe information.
14.
C. The SPID is appended to the 10-digit phone number.
15.
D. The status command provides the necessary information.
16.
D. The timer is set for 2 minutes idle time.
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