Wednesday, February 12, 2014

Aaaaaaaaaand we're back! :)

Here are your CCNP SWITCH Flash Card Practice Exam Questions for Wednesday, Februarys 12!

We're hitting some Cisco switching fundamentals today.   Don't overlook these skills you picked up in your CCNA studies, because they just might pop up on your CCNP SWITCH exam, and success is all about mastering the fundamentals!

1.    For each of the following, tell me whether the statement applies to ISL, IEEE 802.1q, both, or neither.

A.    Understands and uses the concept of the native VLAN.

B.    It's Cisco-propietary.

C.    This protocol places a 4-byte header on the frame, with no additional overhead.

D.    Every frame is totally encapsulated.

2.    When dynamic VLANs are in use, what value determines the VLAN membership of a given host?

3.    Speaking of dynamic VLANs, a little protocol called VMPS just might come into play when you're using those.   Which protocol does VMPS use to listen to client requests?

Answers right after this quick, important message!

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And now... the answers!

Question 1: 

A.    Only dot1q understands and uses the native VLAN.  Frames destined for the native VLAN will have no additional overhead added as they're transmitted across the trunk -- not even that little 4-byte header that non-native VLAN frames will get from dot1q.

B.    ISL is Cisco-proprietiary; dot1q is the industry standard.

C.    Dot1q pops that 4-byte header onto a frame that is not destined for the native VLAN.

D.    This is one of ISL's major drawbacks.  ISL will fully encapsulate every frame before sending it across the trunk, whether that frame is destined for the native VLAN or not.

2.  Here's that MAC address again!  The host's MAC address will determine that host's VLAN membership when dynamic VLANs are in use.

3.  VMPS uses UDP to listen to client requests.

Weather permitting, we'll see you Thursday with more help on your CCNP certification.   

Always Be Passing,

Chris Bryant
CCIE #12933
"The Computer Certification Bulldog"

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