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Q9. The Cisco Catalyst 1900 switches support which three LAN switch types? [Select 3].
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A. Store-and-Forward B. FragmentFree C. InstaSwitch D. FastForward
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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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