07年11月网络工程师模拟试题（3）上午试卷

　　(63) A.地址欺骗

　　B.缓冲区溢出

　　C.强力攻击

　　D.拒绝服务

　　●SNMP定义为依赖 (64) 数据报服务的应用层协议。

　　(64) A.TCP

　　B.UDP

　　C.IP

　　D.IPX

　　●为两个对等的开放系统之间提供按"请求/应答"方式交换管理信息的协议是 (65) 。

　　(65) A.CMIS

　　B.CMIP机

　　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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