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18 Cards in this Set
- Front
- Back
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What size does a packet have to be to be considered a runt?
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less than 64 bytes
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What size does a packet have to be to be considered a giant?
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more than 1518 bytes
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What is fragment-free switching also known as?
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modified cut-through
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What are higher-end Cisco LAN switches known as? Why?
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multilayer switches- they operate at Layer 3 and sometimes above
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What switching method do higher-end Cisco LAN switches use by default?
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store-and-forward
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What do Cisco switches use to determine whether to switch between store-and-forward and cut-through switching?
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a user-defined error threshold
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What switching method has the most latency?
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store-and-forward
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What switching method has the least latency?
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cut-through
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Is latency for cut-through switching consistent?
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yes- only a set amount of data is read before forwarding
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Is latency for store-and-forward switching consistent?
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no- the entire packet (which may vary in size) must be read before forwarding
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What are the two types of switches?
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cut-through and store-and-forward
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How does a cut-through switch operate?
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it forwards packets as soon as the destination address is read
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What type of switch is faster?
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cut-through
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What layer do switches work at?
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Layer 2
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What are the 2 types of cut-through switching?
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fast-forward and fragment-free
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What are the advantages and disadvantages of fast-forward cut-through switching?
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has the lowest level of latency, but does not check for errors and is not good for networks with high collision rates
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How does fragment-free cut-through switching work?
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it filters out collision fragments, then forwards the packets
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What size are collision fragments?
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less than 64 bytes
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