Answers to Chapter 6 Q&A Section 409
7
Write out the commands to define only Telnet and FTP as interesting traffic for DDR.
The following commands define only Telnet and FTP as interesting traffic for DDR:
access-list 100 permit tcp any any eq 23
access-list 100 permit tcp any any eq 20
access-list 100 permit tcp any any eq 21
dialer-list 1 protocol ip list 100
8
List two of the most common encapsulations available for use on BRI interfaces.
Two of the most common encapsulations available for use on BRI interfaces are PPP and
HDLC.
9
An interface that has been configured not to send routing updates is known as what type
of interface?
The interface is a passive interface.
10
When using rotary groups, what should determine the dialer interface number?
The logical dialer interface number must match the rotary-group number defined on each
physical interface.
11
What technology is used to provide redundancy for WAN links?
Dial backup is used to provide redundancy.
12
DDR traditionally involves the use of static routes. If static routes are not desired, what
technology can be implemented?
You can implement snapshot routing.
13
What information is required of the telco to implement PRI implementations?
The telco must provide the switch type, the framing, and the line code.
14
List the options available for T1 and E1 framing and line code configuration.
The available options are T1 = AMI/B8ZS and SF/ESF, E1 = AMI/HDB3, and
CRC4/No-CRC4.
15
List the command to have the router forward all incoming voice calls to internal MICA
technology modems.
isdn incoming-voice modem
Answers to Chapter 6 Q&A Section
1
List the two most common implementations of ISDN.
The two most common implementations are BRI and PRI.