There are several questions, h3c, please be answered by experts.

1, the port number 80 used by the http protocol.

2. you should choose C.

Because all ports of the hub share a bandwidth, only two ports can transmit data at the same time, and the other ports can only wait-so it has only one collision domain.

Hub is a broadcast mode. When one port is working properly, all other ports will hear this information.

3. Manually set the E0/ 1 interface as the passive interface under rip routing.

Router rip

Passive interface E0/ 1

In this way, the interface only receives and does not send rip routing update messages.

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