Friday, August 24, 2007

Here are the answers to Wednesday's questions!

CCNA Certification:

Short answer: What is the decimal equivalent of the hex value Fa8?

Answer: We have 15 ("F") units of 256, 10 ("a") units of 16, and 8 units of 1.

3840 + 160 + 8 = 4008

CCNP Certification / BSCI Exam:

Which of the following statements are true regarding the expression of a single IPv6 address?

A. There is no limit on zero compression.

B. There is no limit on leading zero compression.

C. There is a limit on how many times you can use zero compression.

D. There is a limit on how many times you can use leading zero compression.

Answer: B, C. Zero compression is the act of replacing blocks of zeroes with double-colons and can only be used once in a single address. Leading zero compression is the act of dropping leading zeroes in a single block, and there is no limit in how many times you can do this in an IPv6 address. Just remember to leave at least one number in such a block!

CCNP Certification / BCMSN Exam:

Short answer: What command is used to place individual switch ports into an Etherchannel?

Extra credit: How many physical channels can be placed into an Etherchannel?

Answer(s): Use the channel-group command to place ports into an Etherchannel. To get the extra credit ;), you should know that you can place up to eight physical channels into an EC.

CCNP Certification / ISCW Exam:

Identify the true statements regarding Authentication Header.

A. AH uses IP protocol number 50.

B. AH uses IP protocol number 51.

C. AH authenticates the header.

D. AH does not authenticate the header.

E. AH encrypts the packet's payload.

F. AH does not encrypt the packet's payload.

Answers: B, C, F. AH uses protocol number 51, and it does authenticate the header - after all, it's Authentication Header! AH does not encrypt the payload itself, though.

CCNP Certification / ONT Exam:

What type of delay is defined as the amount of time it takes a packet to be transferred from the input interface of a router to the output interface?

A. Queueing delay

B. Propagation delay

C. Processing delay

D. Serialization delay

Answer: C. That might sound like queueing delay, but it's actually the description of a processing delay.

New questions posted later today!

To your success,

Chris Bryant
CCIE #12933

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