Friday, October 25, 2013

Here's your free CCNA and CCENT practice exam for Friday, October 25!

Be sure to scroll down in the blog and tackle all the practice exams I posted this week, and I'll see you over the weekend with another new exam!

Let's get to today's exam!

1.   A trunk between two Cisco switches is using IEEE 802.1q as its trunking protocol.  What kind of traffic will be totally untagged by the switch forwarding traffic across the trunk?

A. All traffic will be untagged.

B.  No traffic will be untagged.

C.  Only traffic destined for the native VLAN will be tagged.

D.  Traffic destined for the native VLAN will not be tagged, but all other traffic will be.

2.  There's a problem with one of our WAN connections.   The output of "show interface serial 0/0" gives us this information:

"Serial 0/0 is up, line protocol is down"

Assuming there is only one issue with the connection, which of the following is the most likely culprit?

A.  There's a loose cable.

B.  One of the interfaces involved has been closed.

C.  Clockrate is not being supplied by the DCE.

D.  STP has been finetuned by someone who didn't quite know what they were doing.

3.   What is the shortest legal expression of the IP Version 6 loopback address?

4.   What command can you use to restrict Telnet access to a Cisco router on the basis of the source IP address of the incoming authentication attempt?

Answer and explanations right after this brief, important message!

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And now... the answers!

1.  "D".  With dot1q, traffic destined for the native VLAN will not be tagged.

2.  "C".  The combination of the interface being physically up and logically down tells us the cable is fine, and the interfaces are open - there is no physical issue.   

This combination is caused by the lack of a keepalive such as a Frame Relay LMI -- and by a missing clockrate!

3.   The IPv6 loopback address's shortest legal expression is ::1. (The period at the end of that sentence is not part of the expresssion.)

4.  Watch this one -- on the VTY lines, we use access-class rather than access-group.

Thanks for taking today's practice exam, and I'll see you on YouTube and Udemy!

Chris B.

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