CCNA 200-301 And 200-125 Flash Card Practice Exam: OSPF Adjacencies

Hey Bulldogs!

Time for an all-new CCNA 200-301 Flash Card-style Practice Exam!  Today’s topic —  the details of OSPF adjacencies (and a few other tidbits along the way, I’m sure!)

Flash Card-style study has proven to be the most effective method of retaining information, and this OSPF quiz will help you do just that for both the 200-301 and 200-125 exam versions.

For over 1000 CCNA Flash Cards you can use to prepare for exam success anytime and anywhere, check out my exclusive CCNA Flash Card set when you’re done here.   Right now, let’s get started on today’s exam!

Question 1:    Does an OSPF virtual link hold a Designated Router election?

Question 2:    What wildcard mask allows you to place a single IP address into an OSPF area?

Question  3:  What exactly is the meaning of “DROTHER” in the OSPF command output shown here?

OSPF DROTHERs

Question 4:  According to Cisco best practices, what is the maximum number of neighbors an OSPF router should have?

Question 5:  What command will hardcode your router’s OSPF RID to 3.3.3.3?

The answers along with full and never-boring explanations right after this quick ad for my never-boring CCNA 200-125 Video Boot Camp!   (If you’re working on the 200-301 exam, I’m debuting the course for that exam version in late January / early February.)

Chris Bryant's CCNA Video Boot Camp

And now….the answers!

Answer 1:   Simply put, no.  When you run show ip ospf neighbor and there’s a virtual link in place, you’ll see a dash where you would expect to see DR, BDR, or DROTHER.  This non-election  also occurs on OSPF point-to-point networks.

In the following, note the interface name references the virtual link (OSPF_VL0).

OSPF Virtual Link No DR BDR

Answer 2:  To enable OSPF on a single IP address, use a wildcard mask of 0.0.0.0 in the network command.  Here, I’ve placed five loopbacks into five separate areas using that mask.

Wildcard Mask 0.0.0.0

Answer 3:  An OSPF neighbor marked as DROTHER is neither the DR nor the BDR for that segment.   “DROTHER”  is really just shorthand for “other than a DR”.

Answer 4:  Cisco’s best practice is for an OSPF-enabled router to have no more than 60 neighbors.

Answer 5:  The command to hardcode an OSPF RID is router-id in OSPF configuration mode.  Note that this command does NOT take effect immediately.  You have to take one of two actions — either reload the router or clear the OSPF process.  The router will be kind enough to remind you of this,  but the exam won’t, so know this one cold.

Changing The OSPF RID

That’s it for this CCNA flash card practice exam, but there are many more to come. Visit my CCNA Practice Exam page for more, and be sure to check out my CCNA Flash Cards before you go!

Thanks for coming by!

Chris Bryant

CCIE #12933

“The Computer Certification Bulldog”