Sunday, June 08, 2008

Here are the answers to yesterday's Cisco certification training questions!

Network+ questions return tomorrow, and Microsoft Server 2008 certification questions debut in August!

CCENT Certification:

Which of the following terms does NOT describe TCP?

A. best-effort delivery

B. guaranteed delivery

C. uses acknowledgement numbers

D. has no method of detecting lost segments

Answers: A, D. Those two terms describe UDP. TCP does have guaranteed delivery and it does have a method of detecting lost segments.

CCNA Certification:

What are the frame relay LMI types?

Answer: Cisco, ansi, and q933a. Cisco is the default.

CCNP Certification / BSCI Exam:

What port number does BGP use to create neighbor adjacencies?

Answer: That's TCP port 179. Make sure to leave that one unblocked by ACLs!

CCNP Certification / BCMSN Exam:

Classification and marking of data should be done at what layer of the Cisco switching model?

Answer: That should take place as close to the origination point of the data as possible, which means the Access layer.

CCNP Certification / ISCW Exam:

You notice that TCP keepalives are enabled on a router, and you want to disable this feature. What global configuration command will you need to use?

Answer: Use the no service tcp-keepalives command.

CCNP Certification / ONT Exam:

RED has three different modes of packet dropping. Name them.

Answers: "no drop", used when the number of packets in the queue is less than the minimum threshold; "random drop", used when the number of packets in the queue is between the minimum and maximum threshold values; "tail drop", used only when the number of packets exceeds the max threshold. Tail drop can lead to TCP Global Synchronization issues.

New questions posted later today, and links to new CCNA question sets posted on the main website can be found elsewhere in today's blog posts!

To your success,

Chris Bryant
CCIE #12933

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