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As always, my Flash Card questions give you no multiple choice answers. (Neither will a Cisco router or switch!)
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Tease over. Let's get the job done!
1. You have four routers on an OSPF broadcast network. There are no issues with adjacencies or timers. Once the network has converged, how many routers will have full adjacencies with all other routers on that segment?
2. Of our EIGRP friends bandwidth, MTU, delay, and load, which ones figure into the default OSPF route calculation formula?
3. Of the hello timer, dead timer, and stub flag setting, which must match in order for an OSPF adjacency to form?
4. Here's the partial output of an important OSPF command. Name the command.
Link ID ADV Router Age Seq#
126.96.36.199 188.8.131.52 1435 0x80000002
184.108.40.206 220.127.116.11 1436 0x80000003
18.104.22.168 22.214.171.124 1436 0x80000003
5. Name the command that resulted in this output. (Not all output shown, and this is an EXCELLENT troubleshooting command. Hint hint.)
Serial0 is up, line protocol is up
Internet Address 126.96.36.199/24, Area 0
Process ID 1, Router ID 188.8.131.52, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 184.108.40.206, Interface address 220.127.116.11
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:14
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Let's check out the answers to today's free CCNA and CCENT practice exam....
1. The only routers that will have a full adjacency to all other routers on the OSPF broadcast network are the DR and BDR. The DROthers will form a 2-way adjacency with those routers.
Sounds odd? It did to me, too. Watch this video from my CCNA And CCENT Video Training channel on YouTube for a demo on live Cisco routers!
2. The OSPF route calculation formula is Cost = Reference / Bandwidth, so that narrows it down to bandwidth!
3. The OSPF hello timer, dead timer, and stub flag setting must ALL match in order to form and maintain an OSPF adjacency.
4. The command we ran to get that output was show ip ospf database.
5. That's the output of show ip ospf interface with the Serial0 option, which gave me info on that interface only. That's a great command to use to check your OSPF Hello and Dead timers, the OSPF process ID in use, and many other important OSPF values.
Thanks for taking today's free exam! I'll see you Wednesday with another one, and at least one new video!