Thursday, November 06, 2008

It's Thursday, November 6, and here are the answers to Wednesday's questions!

CCNA Certification And CCENT Certification:

Describe each of the three major steps in the TCP three-way handshake.

Answer: In a nutshell....

1. Client sends SYN segment

2. Server responds with SYN-ACK segment

3. Client responds with ACK segment, three-way handshake concludes.

CCNA Security Certification / CCNP ISCW Exam:

What symmetric encryption algorithm is considered the strongest available today?

Answer: The Advanced Encryption Standard (AES).

CCNP Certification / BSCI Exam:

What is the private range of BGP Autonomous System numbers?

Answer: 64512 - 65535.

CCNP Certification / BCMSN Exam:

What is the net effect of the following two commands?

SW2(config)#errdisable recovery cause all
SW2(config)#errdisable recovery interval 300

Answer: The router can now "self-recover" from a port going into err-disabled state regardless of cause. Otherwise, the port would need to be manually reenabled. The interval is expressed in seconds, so there will be a five-minute interval before that self-recovery.

CCNP / ONT Exam:

Which of the following accurately describes WEP?

A. uses static keys

B. offers one- and two-way authentication

C. strong encryption

D. uses clear-text keys

Answer: A, D. WEP offers only one-way authentication, and this encryption scheme is anything but strong!

More questions later today!

To your success,

Chris Bryant

CCIE #12933

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