Cisco CCNA mock exam questions sample test – Question 409

.Which of the following commands could you use to verify the type of serial cable you are connected to (DCE or DTE)?

A. show interfaces
B. show controllers
C. show ip interface
D. show interface dce
E. show interface switchport

Correct Answer: B

Explanation:
The show controllers command provides hardware-related information used to troubleshoot and diagnose issues with Cisco router interfaces. The output of the command is as
follows:
routerA# show controllers serial 0
HD unit 1, idb = 0x1C44E8, driver structure at 0x1CBAC8
buffer size 1524 HD unit 1
V.35 DTE cable, clock rate 64000
The preceding output indicates that a V.35 DTE cable is currently connected to interface Serial 0, and that a clock rate of 64000 bps has been detected from the DCE (the other side
of the serial link). When the other end is a CSU/DSU, as is usually the case, the clock rate is provided by the CSU/DSU. The clocks stopped portion of the following output would
indicate that a clock rate has not been detected from the DCE:
routerA# show controllers serial 0
HD unit 1, idb = 0x1C44E8, driver structure at 0x1CBAC8
buffer size 1524 HD unit 1
V.35 DTE cable, clocks stopped
This condition would be rectified by configuring a clock rate on the DCE router.
The show interfaces, show ip interface, and show interface switchport commands do not display any hardware-related information, such as connected cable types.
The show interface dce command is incorrect because this is not a valid Cisco IOS command.
Objective:
WAN Technologies
Sub-Objective:
Describe WAN access connectivity options