07年11月網(wǎng)絡工程師模擬試題（3）上午試卷

　　(63) A.地址欺騙

　　B.緩沖區(qū)溢出

　　C.強力攻擊

　　D.拒絕服務

　　●SNMP定義為依賴 (64) 數(shù)據(jù)報服務的應用層協(xié)議。

　　(64) A.TCP

　　B.UDP

　　C.IP

　　D.IPX

　　●為兩個對等的開放系統(tǒng)之間提供按"請求/應答"方式交換管理信息的協(xié)議是 (65) 。

　　(65) A.CMIS

　　B.CMIP機

　　C.CMIP

　　D.MIB-2

　　●Networks can be interconnected by different devices.In the physical layer，networks can be connected by (66) or Hubs，which just move the bits from one network to an identical network.One layer up we find bridgas and swiehes,which operate at data link layer.They can accept (67) ，examine the MAC address，and forward the frames to a different network while doing minor protocol translation in the process.In the network layer，we have routers that can connect two netwoks.If two networks have (68) network layer，the router may be able to translate between the packet formats.In the transport layer we find transport gateway，which can interface between the two transport connections.Finally，in the application layer，application gateways translate message (69) .As an example，gateways between Internet e-mail and X.400 e-mail must (70) the e-mail message and change various header fields.

　　(66) A.reapers

　　B.relays

　　C.connects

　　D.modems

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