Sunday, February 16, 2014

Here's your CCNP ROUTE and TSHOOT Training Post for Sunday, February 16!

A very quick personal note....

Thanks for making my CCNP ROUTE Study Guide the #2 Top Rated Networking Book on Amazon!

Having my books rank so highly is truly a dream come true for me. Thanks for making it happen!

Let's get right to today's questions, and if the power stays on, a new video later today!

(Not really complaining about the power.  It could have been a whole lot worse!)

1.   You're troubleshooting an OSPF total stub area.   You notice the area 1 stub no-summary command on each router in that area.  Which of the following is true?

A.   You should remove the no-summary option from the non-ABR routers, as this can cause havoc with route redistribution.

B.   The no-summary option on the non-ABRs is the reason your adjacencies are down.

C.   This really isn't a problem, although the no-summary option is needed only on the ABR.

D.  This isn't the issue, since that full command is required on all the routers in the area.  If one router uses no-summary, they all have to.

2.  You're troubleshooting an OSPF stub area.   You note the area 2 stub command is present on all routers, with no options used.   Which of the following is true of this command?

A.   The area 2 stub command must be configured on all routers in that area.

B.   This command is needed only on the ABR, but it really doesn't hurt anything if you use it on the non-ABRs.

C.   The no-summary option should be used on all routers in any OSPF stub area.

D.   The no-summary option is needed on the ABR to create an OSPF stub area, but not on the other routers in the area.

3.   You're troubleshooting an OSPF point-to-point network and note there is no DR for that segment, nor a BDR.  What should you do about that?

A.  Nothing.  That's fine.

B.  Increase the OSPF interface priority on the router you want to become the DR, and the other will become the BDR.

C.  Decrease the OSPF interface priority on the desired DR.

D.  Use the router-id command to statically raise the RID on the router you want to become the BDR.

The answers after this very brief announcement!

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Let's get to those answers!

1.  C is correct.   When configuring an OSPF total stub area, the command doesn't need to be the same on all routers.  Only the ABR needs the no-summary option....

2.  ... but for regualar OSPF stub areas, the command will be the same on all routers.  You need the area 2 stub command on each router, or you'll lose your adjacencies.   OSPF neighbors must agree on the stub flag setting in order to form and keep adjacencies.  In this case, A is correct.

3.  Believe it or not, A is correct.   An OSPF point-to-point network will have no DR or BDR, and you'll see a dash in the output of show ip ospf neighbor where you'd expect to see DR, BDR, or DROTHER.

Yeah, I didn't believe it either the first time I heard that.   I'll post a video Sunday night to prove that I'm not crazy!

(Well, it might not go that far.  But it will prove what I said about the dash!)

Chris Bryant
CCIE #12933
"The Computer Certification Bulldog"

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Anonymous said...

What happened to the new website?

Chris Bryant said...

Launching in March, that I promise you! :)
Chris B.

Chris Bryant said...

Launching in March, that I promise you! :)
Chris B.

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