Answers to Chapter 5 Q&A Section 407
Answers to Chapter 5 Q&A Section
1
Where is PPP typically implemented?
It is typically implemented on ISDN lines; however, it is also used in point-to-point
dedicated circuits.
2
What is the function of the LCP?
The PPP LCP provides a method of establishing, configuring, maintaining, and
terminating a point-to-point connection.
3
What is the difference between interactive and dedicated asynchronous implementations?
Interactive async implementations enable the dial-up user to see and access the router
prompt. Dedicated async implementations force the connection directly into a PPP
session.
4
List the 4 PPP LCP negotiable options.
The four options are Authentication, Callback, Compression, and Multilink.
5
List the two supported authentication types with PPP.
The two types are PAP and CHAP.
6
In PPP Callback implementations, which router is in charge of the authentication
challenge as well as the disconnect of the initial call?
The server router issues the authentication challenge and disconnects the call so that the
callback can be placed.
7
What command shows the status of individual B channels at any given time?
show dialer
8
What command enables the real-time viewing of CHAP communications?
debug ppp authentication
9
What command enables the real-time viewing of dial events?
debug dialer
10
Describe the PPP Callback procedure.
The client initiates a call to the server. The server answers and issues an authentication
challenge. If successful, the server disconnects and dials the client back. Once again,
authentication takes place. If successful, the call proceeds and data transfer can begin.
11
What are the supported compression types on Cisco routers?
The supported types are Stac, Predictor, MPPC, and TCP header compression.