Wednesday, April 09, 2014






Here's your CCNA and CCENT Training Post for Tuesday, April 9!   (And yes, I know it finally posted on Wednesday -- I know what day it is but apparently Google doesn't. ;)  )


Before we get to today's questions, just a quick word about our fund drive for the Central Virginia Food Bank.


In April, we're donating $5 for every signup to my CCNA Video Boot Camp, and that's equivalent to 20 meals!

Our goal is a donation of $10,000.  Join us today, get your CCNA, and help us feed those who need a helping hand.   See you there!






On to today's practice exam and videos!


1. Of the following, which OSPF network type will NOT elect a DR nor a BDR?  (This assumes no intervention from the admin.)

A.  Broadcast

B.  NBMA

C.  point-to-point





2.  Flash Card question!   What are the OSPF hello and dead timer default settings for a Serial interface on an NBMA network?



3. When it comes to the OSPF RID, which of the following statements are true?

A.  Like most Cisco commands, you just enter it and it works, with no need to break OSPF adjacencies or reload the router.

B.  An interface does not have to be enabled with OSPF to have its IP address serve as an OSPF RID.

C. The command show ip ospf neighbor will display the OSPF RID of the neighbors.

D.  This value cannot be hardcoded.

Watch these vids from my YouTube channel after you check out today's answers, and again before you take your exams.  You can thank me later.  : ) 














Let's get to those answers!


1.  "C". By default, an OSPF point-to-point network will not elect a DR nor a BDR.   We may not want an OSPF NBMA network to perform these elections, but that's not the default behavior.


2.   Those default timers for a Serial interface running OSPF are 30 seconds for the Hello time and 120 seconds for the Dead time.


3. 

Statement 1: False. You have to reload the router or reset the OSPF adjacencies in order for an OSPF RID change to take effect.


Statement 2:  True.  An interface does not have to be running OSPF to have its own IP address serve as the OSPF RID.


Statement 3:  True. You can see your OSPF neighbors' RID with the show ip ospf neighbor command.


Statement 4:  False. You can hardcode it with the router-id command, keeping what you learned in Statement 1 in mind!

I'll see you Friday with a new video! 

Chris B.

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