Time for another new CCNA / CCENT practice exam!  

Let's get started! 

Match the following frame forwarding decisions with each scenario described below.

A.   filtering

B.   forwarding

C.   flooding


The scenarios:

1.   The incoming frame is an "unknown unicast"


2.   The switch's MAC table indicates that the source and destination MAC addresses of the incoming frame are one and the same.


3.   The switch has an entry in its MAC table for the MAC destination address of the incoming frame


4.   The switch does not have an entry in its MAC table for that same MAC destination address


Answers right after this brief, important message!




The answers right after this brief, important message!

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And now... the answers!

1.  (C).  If a frame is an "unknown unicast", it's flooded. 


2.  (A).  When the source and destination MAC address are found off the same port, the switch will filter the frame -- a fancy way of saying the switch will drop that frame.

3.  (B).  If the switch has an entry for the destination MAC, the frame will be forwarded.


4.  (C).  If the switch doesn't have an entry for that value, the frame is flooded.  (This is the definition of an unknown unicast).


Here's a video from my YouTube channel to give you more help with switching. Enjoy the video, and I'll see you on YouTube and Udemy!

Chris B.

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