Exam 100-105 topic 1 question 233 discussion

Actual exam question from Cisco's 100-105

Question #: 233
Topic #: 1

[All 100-105 Questions]

Refer to the exhibit. A network technician is unable to ping from R1 to R2.
What will help correct the problem?

A. Ensure that the serial cable is correctly plugged in to the interfaces.
B. Apply the clock rate 56000 configuration command to the serial0/1 interface of R1.
C. Configure the serial0/1 interfaces on R1 and R2 with the no shutdown command.
D. Change the address of the serial0/1 interface of R1 to 192.1.1.4.
E. Change the subnet masks of both interfaces to 255.255.255.240.

Show Suggested Answer

Suggested Answer: A 🗳️

by paulosrsf at June 26, 2019, 5:27 p.m.

Comments

Submit Cancel

Chiaretta

5 years, 4 months ago

This question is very misleading and A is the right answer. The clockrate command is mandatory on back to back router connection using DTE/DCE cable. The clockrate have to be set on DCE side. In this case, is not specified if router are connected back to back or through ISP DCE's, and is not possible check by the configuration. In some cases is possible that protocol stay down due to cable misconnection. However, the question is asked in an unclear way.

upvoted 1 times

...

Agi

5 years, 5 months ago

The correct anser is C!

upvoted 1 times

...

esawormjr

5 years, 8 months ago

yes, thanx paulosrsf

upvoted 2 times

...

Quan

5 years, 10 months ago

I agree with the answer and the explanation of paulosrsf. Thanks !

upvoted 1 times

...

paulosrsf

5 years, 11 months ago

The correct answer is B. The two interfaces show UP for the layer 1. The problem is with layer 2 because of the message line protocol is down. If both interfaces are hardware up/protocol down, the problem is with encapsulation problems, like HDLC or PPP mismatch, or clock rate problems at the DCE.

upvoted 2 times

...