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Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)or Hubs, which just
Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)or Hubs, which just
admin
2009-02-15
65
问题
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 bridges and swiches, 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.
选项
A、reapers
B、relays
C、connects
D、modems
答案
A
解析
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本试题收录于:
网络工程师上午基础知识考试题库软考中级分类
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