Cisco試題:交換機(jī)轉(zhuǎn)發(fā)時(shí)延原因

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    What type of switching creates variable latency through the switch?
    A.Layer 4
    B.Store and Forward
    C.Cut-through
    D.Inverted
    E.Multiplexed
    F.Modified Cut-through
    Select the 1 best answer
    在交換機(jī)中什么交換方式,會(huì)引起時(shí)延。
    解答:
    因?yàn)樵诖鎯?chǔ)轉(zhuǎn)發(fā)中,交換機(jī)必須先把整個(gè)幀在轉(zhuǎn)發(fā)出去的時(shí)候都讀出來(lái),讀取大的數(shù)據(jù)幀比小的數(shù)據(jù)幀用時(shí)要多的多。所以在讀取時(shí)會(huì)引起時(shí)延。
    正確答案:B
    參考資料:
    Sybex CCNA 4.0 Chapter 1 -- Internetworking The OSI Reference Model - The Data Link layer