What is one use of the router ID in OSPF routing?
- The router ID indicates the highest IPv4 address of all routers that are participating in OSPF routing.
- The router ID identifies the OSPF area.
- The router ID can be used to break a tie in the election process.
- The router ID indicates the router priority value.
Explanation: The OSPF router ID uniquely identifies each router within an OSPF area, and allows each router to participate in the election process in that area. On multiaccess networks, if there is no router priority value configured on the routers, and if there is a tie in the election, the router with the highest router ID is elected DR. The router priority value is a value chosen by the administrator and manually configured on the router. The administrator can manually configure the router ID, or the router can automatically assign itself its highest IPv4 loopback or physical address as the router ID. That interface has to be up but does not have to be participating in the OSPF process.
Exam with this question: CCNA 3 Module 2 Quiz - Single-Area OSPFv2 Configuration
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