Scenario 9-2 673
11
If a routing loop occurred so that IP packets destined to 168.11.12.66 were routed between
routers continually, what stops the packet from rotating forever? Are any notification
messages sent when the routers notice what is happening? If so, what is the message(s)?
12
Describe the role of R1 relating to TCP error recovery for an FTP connection between
PC11 and PC21.
13
Define integrated multiprotocol routing.
14
Describe how R2 learns that R1's IP address is 168.11.123.201.
15
What does NBMA stand for?
16
When does IGRP use split-horizon rules on interfaces with Frame Relay encapsulation?
17
What effect does the no keepalive interface subcommand have on Frame Relay
interfaces?
18
If just the VC between R1 and R3 needed to use encapsulation of ietf, what configuration
changes would be needed?
19
What command lists the total number of Status Enquiry messages received on a Frame
Relay interface?
20
List examples of two ISDN function groups.
21
What type of ISDN channel is used for signaling?
Solutions to Scenario 9-2, Part C--Verification and Questions
The answers to the questions for Scenario 9-2, Part C are as follows:
1
The show ip protocol command (refer to Example 9-13) gives this information.
2
The show ip interface brief command (refer to Example 9-12) gives this information.
3
The show ip route and show ipx route commands list the metric values (refer to
Examples 9-5 and 9-6). The metric value for each IP subnet is the second of the two
numbers inside brackets. Two IPX metrics are located between brackets for IPX routes:
the number of timer ticks and the number of hops.
4
The show ipx servers command (refer to Example 9-14) lists this information.
5
The debug ip igrp transaction command provides debug output with details of the IGRP
updates. The output immediately follows the IGRP: sending update to 255.255.255.255
via Serial0 (168.11.123.201) message in Example 9-12. Notice that all four routes are
advertised because split horizon is disabled on the serial interface when no subinterfaces
are used.
ch09.fm Page 673 Monday, March 20, 2000 5:23 PM