Chapter 12 - Implementing Point-to-Point WANs

Question 1

This telco terms refers to the gear that sits at their customer’s sites on the ends on the link.

Answer 1

Customer premise equipment (CPE)

Question 2

This device provides a function called clocking, in which it physically controls the speed and timing at which the router serial interface sends and receives each bit over the serial cable.

Answer 2

Channel service unit/data service unit (CSU/DSU)

Question 3

This is the short cable that connects the CSU and the router serial interface.

Answer 3

Serial cable

Question 4

What’s the bit rate of a DS0 line?

Answer 4

64 Kbps

Question 5

What’s the bit rate of a Fractional T1?

Answer 5

Multiples of 64 Kbps, up to 24X

Question 6

What’s the bit rate of a DS1 (T1)?

Answer 6

1.544 Mbps

Question 7

What’s the bit rate of a Fractional T3?

Answer 7

Multiples of 1.536 Mbps, up to 28X

Question 8

What’s the bit rate of a DS3 (T3)?

Answer 8

44.736 Mbps

Question 9

What are 2 main categories for PPP control protocols?

Answer 9

Link Control Protocol and Network Control Protocol

Question 10

What are 2 PPP authentication protocols?

Answer 10

PAP and CHAP

Question 11

Which is more secure - PAP or CHAP?

Answer 11

CHAP - It encrypts the username and password when sent between routers.

Question 12

Which router is configured with the clock rate command? The DTE or DCE?

Answer 12

DCE

Question 13

Which command would show the clock rate on Serial 0/0/0?

Answer 13

R1>show controllers Serial0/0/0