1. Refer to the exhibit. Why are two OSPF designated routers identified on Core_Router?
A. Core_Router is connected to more than one multiaccess network.
B. The router at 208.149.23.130 is a secondary DR in case the primary fails.
C. Two router IDs have the same OSPF priority and are therefore tied for DR election.
D. The DR election is still underway and there are two contenders for the role.
Answer: A
解释一下:在Core-Router的邻居表中可以 看到有两个DR,但是当我们仔细看这两个DR连着的接口时,就很明白了,因为Core-Router连着两个多路访问链路,当然这两个多路访问链路中都需要选举出自己的DR来了。
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