Switching Method

One type of frame switching uses low-latency forwarding and then switches to a
higher-latency error checking mode when an error threshold is exceeded. What is
the name of this frame switching mode?

A. store and forward
B. fragment-free
C. adaptive cut-through
D. fast-forward

Answer: C

Explanation: Adaptive cut-through is a modified form of cut-through switching in
which the switch waits for the collision window (64 bytes) to pass before forwarding.
It means that each frame will be checked into the data field to make sure no
fragmentation has occurred.

I picked... B.. Is it really C?

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Comments

mwgood

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2600/c26userg/token.htm#15147

mzinz

Yeah, it is.

The key, or the way that they make it clear, is when the question says that the method "switches" and begins scanning a larger portion of the frames. If it receives too many errors, it begins adapting.

agustinchernitsky

Fragment free waits for the first bytes (can't remember how many) of the frame to see if its fragmented.

cut-through doesn't care about anything...

tuscani

THanks... Interesting.. I am this many months into my studies and this is the first I have heard of the adaptive version.. Just when you think you have studied it all!

agustinchernitsky

Waittttttttt!

I re-checked my book... since as you... I didn't like the adaptive stuff. According to my info, 3 types of switching:

Cut-through (or FastForward according to Cisco).
FragmentFree (Modified Cut-Through)
Store-and-forward.

So, your answer should be... D

EdTheLad

agustinchernitsky wrote:

Waittttttttt!

I re-checked my book... since as you... I didn't like the adaptive stuff. According to my info, 3 types of switching:

Cut-through (or FastForward according to Cisco).
FragmentFree (Modified Cut-Through)
Store-and-forward.

So, your answer should be... D

Dont make the assumption that everything you need for the exam is in your book! Multiple sources are a must.

agustinchernitsky

I agree... but I surely forgot about the FastForward name