Answers to Chapter 4 Q&A Section 405
14
In what configuration mode must you be to configure the physical properties of an
asynchronous interface?
You must be in line configuration mode.
15
What does it mean when the signal pin RTS is asserted?
It means that the DTE has available buffer space.
16
What is the command to manually begin a chat script named remcon?
start-script remcon
17
When should modem autoconfigure discovery be used, and what are the ramifications of
doing so?
modem autoconfigure discovery should be used only when you are physically not near
the modem and do not know what type it is. After autoconfigure learns the modem type,
the modem should be configured to reduce the CPU usage on the router.
18
What command would you use to add an entry to the modemcap database called
newmodem?
modemcap edit type newmodem
19
Which interface type provides clocking for a line?
DCE provides clocking for a line.
20
List four reasons why you would use a chat script.
You would use it to initialize a modem, provide a modem with a dial string, log in to a
remote system, or execute a set of commands on a remote system.
21
What command can be used to determine whether Serial 0 is the DCE or DTE?
show controller S0
22
What command lists the transmit and receive speeds for the asynchronous ports on
the router?
show line
23
On which pins does the DTE device send and receive?
It transmits on pin 2 and receives on pin 3.
24
Which of the following would trigger a chat script start?
a. Line reset
b. DDR