2014年思科认证：CCNA认证考试高分必备能力提升试题及答案3
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1. which type of switching reads in the entire frame before forwarding it?
a.) fast forward b.) tabling c.) cut-through d.) store-and-forward e.) inverse arp f.) routing
d store-and-forward is slower, but it checks the frame for errors before forwarding. this can actually help to improve overall network performance on noisy lines.
2. what is a characteristic of store and forward switches?
a.) they decrease latency. b.) they forward the frame before it is completely read. c.) they are the same a cut-through switching. d.) they read the entire frame and check crc before forwarding. e.) they work at wire speed.
d
3. what is the standard isdn term for a non-native analog telephone?
a.) et b.) le c.) te2 d.) te1 e.) ta c terminal equipment 2 (te2) does not support native digital isdn. the analog device will require an external analog to digital converter.
4. novell netware has an ethernet frame type called ethernet_802.3. what is the matching cisco command line keyword for this encapsulation method?
a.) arpa b.) snap c.) novell-ether d.) sap e.) dix f.) gns
c novell 802.2 = sap (contains 802.2 llc headers) novell 802.3 = novell-ether (netware proprietary) ethernet_ii = arpa (the internet standard) snap = snap (field type set to ’aa’)
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