CCNA (And CCNP!) Practice Exam :
OSPF
Here's a practice exam and tutorial on OSPF for you CCNA candidates - and it wouldn't hurt you CCNP candidates to take it!
To raise the level of difficulty a bit, many of today's questions are short answer. You'll find the answers at the bottom of the page -- and when you're done with the exam, be sure to take our many other CCNA Practice Exams and check out our Cisco exam tutorials page!
Chris Bryant
CCIE #12999
"The Computer Certification Bulldog"
chris@thebryantadvantage.com
Question 1:
OSPF allows the logical segmentation of a large network into what kind of "subdivision"?
Question 2:
What's the default cost of a 56 kbps link in OSPF?
A. 1562
B. 1785
C. 10
D. 64
Question 3:
In CiscoLand, it's always a good idea to know more than one way to do something.
Let's say you want to double the default time that your local OSPF router will wait to declare a neighbor dead. The Hello packets keeping that adjacency alive are coming in through the Ethernet0 interface.
Name *two* different commands you could use to meet that requirement.
Question 4:
By default, OSPF will send Hello packets every 30 seconds out of which of the following interface types?
A. Serial
B. Ethernet
C. Both Serial and Ethernet
D. Neither one
Question 5:
Give two common names for the algorithm used by OSPF.
Question 6:
Describe the operation of Split Horizon in OSPF.
A. OSPF doesn't use SH.
B. LSAs entering an interface cannot be sent back out the same interface.
C. LSAs that are aging out are marked as unusable.
D. LSAs entering an interface can be advertised back out that same interface.
Question 7:
You're working with an OSPF hub-and-spoke network. What is true of the hub router?
A. It should be made the DR for that segment.
B. It should be made the BDR for that segment.
C. It really doesn't matter if it becomes the DR, BDR, or fills another role.
D. It must not become the DR or the BDR for that segment.
Answers right after this brief and important message!
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Answers:
1. You'll divide an OSPF network into areas.
2. The default cost of an OSPF 56kbps link is 1785.
3. The default OSPF Hello time of an Ethernet interface is 10 seconds, so to double it we need to set it to 20 seconds.
Yeah, I know, but I still had to say it. :)
The OSPF Hello time can be set with the ip ospf hello-time command. That's one way, and the most obvious:
ip ospf hello-time 20
Another OSPF default is that the Dead time is 4 times the Hello time. Therefore, if we set the Dead time to 80 seconds, the Hello time will dynamically adapt to that - and change to 20 seconds.
ip ospf dead-time 80
Those are both interface-level commands.
4. "A". The default Hello time on Serial links is 30 seconds.
5. Two common names for the OSPF algorithm: SPF and Dijkstra.
6. "A". OSPF doesn't use Split Horizon.
7. "A". You definitely want the hub router to become the DR.
Thanks for taking this practice exam.
Be sure to take our many other CCNA Practice Exams and check out our Cisco exam tutorials page!
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