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LAN switch types

 

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Q9. The Cisco Catalyst 1900 switches support which three LAN switch types? [Select 3].

A. Store-and-Forward

B. FragmentFree

C. InstaSwitch

D. FastForward

  Correct Answer: A, B, D

 

Explanation:

The Catalyst 1900 and 2820 series switches support three types of switching methods:

1. FastForward (Cut-through): In this type of switching, the packet is forwarded as soon as the destination address is read. This has least latency.

2. FragmentFree ( Modified cut-through): This type of switching is usefull when your network is experiencing large number of collisions. FragmentFree switching has a latency in between FastFoward and the Store-and-Forward.

3. Store-and-Forward: This method stores the entire frame and checks for errors before forwarding it on to another port. Store-and-forward has the highest latency compared with both FastForward and FragmentFree.

The default switching method used by Catalyst 1900 series switches is FastForward.

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