Tuesday, July 10, 2007

Here are the answers to Monday's Cisco CCNA and CCNP practice questions!

Cisco CCNA Exam:

Short answer: In the MAC address aa-bb-cc-11-22-33, what portion is the OUI?

Answer: aa-bb-cc. The first half of the MAC address is the Organizationally Unique Identifier.

CCNP Certification / BSCI Exam:

Identify the optional transitive BGP attributes.

A. origin

B. next-hop



E. aggregator

F. atomic aggregate

G. community


Answer: E, G. Community and aggregator are the two transitive optional BGP attributes, "transitive" meaning that their values will be carried from one AS to another. MED is the only optional non-transitive attribute.

CCNP Certification / BCMSN Exam:

Short answer: Briefly describe the purpose and operation of DHCP Snooping.

Answer: DHCP Snooping is a method of detecting rogue DHCP servers and minimizing or eliminating their impact on the network. DHCP Snooping determines whether a DHCP device is trusted or untrusted, and only DHCP messages from trusted devices are passed through the switch.

CCNP Certification / ISCW Exam:

Short answer: What term is used to describe a router with some interfaces in a "normal" IP network, and other interfaces in a Multiprotocol Label Switching network?

Answer: This is an Edge Label Switch Router, or Edge LSR.

CCNP Certification / ONT Exam:

Short answer: What is the default DSCP setting?

Extra credit: Of the 8 bits in the ToS field, which bits comprise the DSCP?

Answers: The default DSCP setting is zero. From left to right, the first six bits of the ToS field comprise the DSCP value (the six "most significant bits").

Fresh-baked questions posted later today!

To your success,

Chris Bryant
CCIE #12933

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