CCNA考題分析-交換機(jī)轉(zhuǎn)發(fā)時(shí)延簡(jiǎn)析

字號(hào):

問(wèn)題:
    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 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