Thursday, July 26, 2007

Here are the answers to Wednesday's Cisco routing and switching training questions!

CCNA Certification:

You have a hub-and-spoke network, and you plan to use the same DLCI number on all the spokes to reach the hub. Cisco's official name for this addressing scheme is ____________ .

Answer: global addressing.

CCNP Certification / BSCI Exam:

OSPF DRs and BDRs listen for network topology change notifications at the IP address ____________, and then send updates related to these changes at the IP address ____________.


CCNP Certification / BCMSN Exam:

You've just configured Uplinkfast on a switch. What is the priority of the switch?

Answer: Uplinkfast takes steps to ensure this switch will not become the root, and one of those steps is to raise the switch priority to 49,152.

CCNP Certification / ISCW Exam:

What protocol numbers do AH and ESP use?

Answers: Authentication Header (AH) uses IP protocol number 51, while Encapsulating Security Payload (ESP) uses IP protocol number 50.

CCNP Certification / ONT Exam:

Examine the following configuration. Assuming all packets being transmitted are 1400 bytes in size, how many packets will Queue 1 transmit before it's Queue 2's turn to send?

R1(config)#queue-list 1 queue 1 byte-count 3000
R1(config)#queue-list 1 queue 2 byte-count 2000
R1(config)#queue-list 1 queue 3 byte-count 1000
R1(config)#queue-list 1 queue 4 byte-count 1000

Answer: Three. After Q1 sends one 1400-byte packet, there are 1600 bytes left in its turn. After sending a second packet, there are 200 bytes left. In that circumstance, PQ will send another packet, since the queue is still under its limit. PQ will *not* fragment the packet, but will send it in its entirety.

New questions posted later today!

To your success,

Chris Bryant
CCIE #12933

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