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問答題Neither external routes nor interarea routes will inject into this area. What is the area type and how can you configure it？

1.問答題一個(gè)不多于50臺主機(jī)的網(wǎng)絡(luò)，合適它的掩碼是多少？

2.問答題what is administrative distance.

3.問答題In multicast network how to select DR？ and what is the order？

4.問答題What field in IP packet is prevent the packet from a route to router forever？

5.問答題what is anycast address （Ipv6）？