Thursday, December 19, 2013

Here's your all-new CCNA  Training Post for Thursday, Dec. 19!

A new CCNP post follows later today!

Hey, I have a quick favor to ask before we get to today's questions....

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Thanks!  : )  Let's get to work on OSPF!

1.  What OSPF command would prevent Hello packets from being sent out a particular interface, while still allowing the network that interface resides on to be advertised to other routers?

2.  Where exactly would you configure that command?  (Don't say "On a Cisco router", that's not quite specific enough.)

3.  What is the exact command you would use on an Ethernet interface to double its default OSPF cost?

4.   You've just changed the OSPF reference bandwidth on a Cisco router.  What should you do next?

A.  Restart the router in order for the change to take effect.

B.  Restart the OSPF processes in order for the change to take effect.

C.  Ensure the reference bandwidth value you set on this router is the same on other OSPF routers in the same network.

D.  Use the default-information originate command to reset the OSPF costs.

5.  An OSPF router wants to advertise a default route to neighboring stub routers. Problem is, that router doesn't have a default route to advertise.  Which of the following single commands could you run in order to resolve this issue?

A.  default-information originate

B.  passive-interface

C.  redistribute static

D.  None of the above.

Answers right after this brief, important break!

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And now -- the answers!

1 and 2:  You'd use the passive interface command to do so, and that command is configured under the OSPF routing process, not on the interface itself:

router ospf 1
    passive-interface ethernet0

3.  The default OSPF cost of an Ethernet interface is 10, so you'd use the interface-level command ip ospf cost 20.

4.  "C".  You don't have to reload the router, but you should make sure the reference bandwidth is the same on all OSPF-speaking routers in your network.  The router will give you a warning about that, and I'll show you that info in a new Video Boot Camp later today!

5.  "D".  You need this full command:

default-information originate always

The "always" allows the router to advertise a default route that it doesn't actually have.

"default-information originate" by itself will advertise a default route IF the router actually has one, and the question said the router didn't have one. (That's why route redistribution wouldn't work, either.)

Great work!  See you later today with a new Video Boot Camp and on Friday with a new practice exam!

Always Be Passing,

Chris B.

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