1. What is the default OSPF network for the following media types: Ethernet, Token Ring, and FDDI?
Highlight for answer: Broadcast
2. What OSPF router type connects one or more areas to the backbone and acts as a gateway for interarea traffic?
Highlight for Answer: Area Border Router (ABR)
3. To be in compliance with the BGP synchronization rule, there must be a match for the prefix in the IP routing table in order for an internal BGP (iBGP) path to be considered a valid path. What additional criteria must an OSPF route meet?Highlight for answer: The OSPF router ID must match the BGP router ID of the iBGP neighbor.
4. Give at least two possible reasons as to why the prefix 126.96.36.199/24 is experiencing a RIB-failure:
R1> sh ip bgp
BGP table version is 5, local router ID is 188.8.131.52
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
Origin codes: i – IGP, e – EGP, ? – incomplete
Network Next Hop Metric LocPrf Weight Path
r> 184.108.40.206/24 10.1.1.2 0 110 0 300 i
*> 220.127.116.11/24 10.1.1.2 0 160 0 300 i
Highlight for answer: Generally this is due to the existence of a route with a lower AD in the IP routing table. This can also be due to a memory error or the number of routes in VRF exceeding the route-limit configured under the VRF instance (outside of the scope of the Routing and Switching lab…)
5. What is the difference between OSPF neighbor and adjacencies?
Highlight for answer: A neighbor is another OSPF router that is attached to one of the first router’s directly connected links.
An OSPF adjacency is a conceptual link to a neighbor over which LSAs can be sent.
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