题目内容
（请给出正确答案）
[单选题]
A ____ can connect two LANs, a LAN and a WAN, or two WANs.
A.repeater
B.bridge
C.switch
D.router
提问人：网友liqi8889
发布时间：2022-01-07
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A、L ＞ L1 + L2
B、L = L1 + L2
C、L ＜ L1 + L2
D、All the 3 results are possible
题目内容
（请给出正确答案）
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第2题
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A．The hub
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第10题
从供选择的答案中，选出最确切的解答。 Networks can be interconnected by different devices. In the phys
从供选择的答案中，选出最确切的解答。
Networks can be interconnected by different devices. In the physical layer, networks can be connected by(1)or hubs, which just move the bits from one network to an identical network. One layer up we fine bridges and switches, which operate at data link layer. They can accept(2)，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 networks. If two networks have(3)network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message(4). As an example, gateways between Intemet E-mail and X.400 E-mail must(5)the E-mail message and change various header fields.
