As a network engineer studying for the CCNA 200-301 exam, I know that understanding Open Shortest Path First (OSPF) is crucial to my success. OSPF is a routing protocol that enables routers to dynamically learn the best path to a destination network. To prepare for this topic, I've been reviewing many OSPF questions to make sure I fully understand the concepts.
I've come across one tricky OSPF question that asks, "What's the difference between OSPF passive and active interfaces?" While both types of interfaces can participate in OSPF routing, an active interface sends OSPF hello messages to discover neighboring routers, while a passive interface does not. By default, all interfaces on a Cisco router are active, so if you want to make an interface passive, you need to configure it explicitly.
Another challenging OSPF question is, "What's the significance of the OSPF router ID?" The router ID is a unique identifier for each router in an OSPF network. It is used to distinguish between routers and to elect the designated router (DR) and backup designated router (BDR) in multi-access networks. The router ID is usually the highest IP address on the router, but if there is no loopback interface, the highest active interface IP address is used.
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