Thursday, September 18, 2008

It's Friday, September 19, and I've got a new YouTube video for you as well as the answers to yesterday's Cisco practice exam questions!

Here's a new YouTube video for you - this one covers a question I'm asked every day in email. "Should I take the one- or two-exam path to the CCNA?"

CCNA And CCENT Certification: The Path(s) To Success

Be sure to subscribe to my YouTube channel to be notified of every one of my upcoming Cisco certification videos!

Let's check out the answers to yesterday's questions...

CCNA Certification And CCENT Certification:

Short answer: You need to find out which end of a DTE/DCE cable is connected to a Cisco router. Problem is, the router cabinet is so packed with cables that you can't begin to see the lettering on the cable. (Not that this would ever happen, right?)

What command will give you this information, assuming the cable is connected to Serial0?

Answer: You can run show controller serial 0 to get that information. The DTE/DCE cable information is near the top of the command output.

CCNA Security Certification / CCNP ISCW Exam:

Name two major differences between RADIUS and TACACS+.

Answer: TACACS+ is Cisco-proprietary and is TCP-based, where RADIUS is an open-standard protocol and is UDP-based.

CCNP Certification / BSCI Exam:

What command resulted in the following output?

R3# ?

OSPF Process 1 internal Routing Table

Codes: i - Intra-area route, I - Inter-area route

i [64] via, Serial0, ABR/ASBR, Area 0, SPF 38
i [64] via, Serial0, ABR, Area 0, SPF 38

Answer: That's the output of show ip ospf border-routers.

CCNP Certification / BCMSN Exam:

You want to initialize a Cisco switch - totally. What commands should you run?

Answer: In addition to a write erase, you should run delete vlan.dat to get rid of any VLAN information.

CCNP / ONT Exam:

Name the two fixed-length processing delays, the two variable-length processing delay, and a brief description of each.

Variable-Length Delays:

Queuing Delay is the amount of time a packet spends in the exit queue before being transmitted.
Processing Delay is the time it takes the network device to move a packet from the incoming queue into the appropriate outgoing queue.

Fixed-Length Delays:

Serialization Delay is the time it takes to place the frame onto the physical medium.

Propagation Delay is the amount of time it takes for the bits to cross the physical media from the tranmission point to the point of reception.

I'll have more questions and answers for you later today!

To your success,

Chris Bryant
CCIE #12933

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