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Cisco uses a simple formula to calculate OSPF cost: The cost of the entire path is the sum of the costs of the outgoing interfaces along the path.
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To what does the 128 refer to in the router output above? The highest IP address of all loopback interfaces will be chosen -> Loopback 0 will be chosen as the router ID. Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router? Which address are OSPF hello packets addressed to on point-to-point networks? It uses multicast address 224.0.0.5 to establish OSPF neighbor relationship.Į is not correct because configure EIGRP on these routers (with a lower administrative distance) will force these routers to run EIGRP, not OSPF.ĭ and F are correct because these entries must match on neighboring routers: R1 and R3 are configured in different areas.Ī is not correct because the backbone area of OSPF is always Area 0.ī is not correct because R1 or R3 must be the DR or BDR -> it has to establish neighbor adjacency with the other.Ĭ is not correct because OSPF neighbor relationship is not established based on static routing. EIGRP is also configured on these routers with a lower administrative distance.į. The hello and dead interval timers are not set to the same values on R1 and R3.Į. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.ĭ. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.Ĭ. All of the routers need to be configured for backbone Area 1.ī. What are possible reasons for this problem? (Choose two)Ī. R1 is unable to establish an OSPF neighbor relationship with R3. Administrators can filter these LSAs to meet their requirements easily. For answer E, it allows extensive control of routing updates via Link-State Advertisement (LSA). It is simpler to configure than RIPv2.Īnswer A and C are obviously correct. It allows extensive control of routing updates.į. It increases routing overhead on the network.Į. It confines network instability to one area of the network.ĭ. It is used to route between autonomous systems.Ĭ. Which statements describe the routing protocol OSPF? (Choose three)ī. What is the default administrative distance of the OSPF routing protocol? Open Shortest Path First (OSPF) is a routing protocol developed for Internet Protocol (IP) networks by the Interior Gateway Protocol (IGP) working group of the Internet Engineering Task Force (IETF). All routers in the same OSPF area must have the same process ID if they are to exchange routing information. It is needed to identify a unique instance of an OSPF database.ĭ It is an optional parameter required only if multiple OSPF processes are running on the router.Į. Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two)Ĭ.
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If you are not sure about OSPF, please read my OSPF tutorial first. Note: Although OSPF topic is under ICND2 but some very basic OSPF questions are asked in the ICND1 so you should take some time to know about it. Premium Member: You can test your knowledge with these questions first via this link.