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