Tuesday, November 26, 2013


Here's your all-new CCNA and CCNP Training Post for Tuesday, November 26!


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Today's CCNA / CCENT Practice Exam Topic:  "Fundamentals Of Switching"

Let's get to it!   A little warmup first....


1.   The receipt of an "unknown unicast" frame results in which of the following actions by a Cisco switch?

A.  flood

B.  filter

C.  frame

D.  multicast




2.  Host A sends a frame addressed to Host B.   After the switch between those two devices receives that frame, the switch sends a copy of that frame out every single port except the one it came in on.

Host B successfully receives the frame and immediately responds to host A.

Assuming normal switch operation, which of the following are true of the frame sent from Host A to Host B?

Choose ALL that apply.


A.  That frame was an unknown unicast.

B.  The frame was flooded by the switch.

C.  The switch filtered the frame.

D.  The frame was a multicast.

E.   The frame was a broadcast.


3.  Match the Cisco switch processing method with the phrase that describes it.

The methods: 

Cut-through


Store-and-forward

Fragment-free

A.  No error detection capabilities

B.  High level of error detection

C.  The "middle ground" of error detection among these three methods


We'll get to the answers right after this incredibly brief message!


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Now let's get to those answers....


1.  "A".  An "unknown unicast" sounds like a contradiction in terms, but the "unknown" refers to the fact that the switch doesn't have an entry for this frame's unicast destination in its MAC table.  Therefore, that frame's going to be flooded.


2.  A, B.  This frame was a unknown unicast, and the switch flooded it.

How do we know it wasn't a broadcast frame?   The first line of the question mentions "... a frame addressed to Host B", which makes the frame a unicast.


3.  Cut-through switching has no error detection capabilities, store-and-forward has the greatest error detection capabilities of the three, and fragment-free is the middle ground.   

Fragment-free switching has some error-detection capabilities, but not as great as store-and-forward.

Be sure to scroll down in the blog for more practice exams, and I'll see you later today with a brand-new video!

See you then!

Chris B.



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