Tuesday, October 07, 2008

Here are the answers to Tuesday, October 7's Cisco practice exam questions!

CCNA Certification And CCENT Certification:

The Frame Relay command frame-relay map is appropriate for which of the following interface types?

A. physical interface, no subinterfaces

B. point-to-multipoint subinterface

C. point-to-point subinterface

D. loopback

Answer: A, B. On a PTP subinterface, you should use the frame-relay interface-dlci command. You would not configure frame relay commands on a loopback interface.

CCNA Security Certification / CCNP ISCW Exam:

What's the main difference between stateful and stateless packet filtering?

Answer: Stateless packet filtering only considers the values in the ACL - there's no attempt to determine if this packet is part of an already-existing connection, or attempting to create one. With protocols that use random port numbers at times - FTP, for example - there can be some real problems establishing a connection.

Stateful packet filtering does monitor the connection state, and that's particularly important when it comes to preventing TCP attacks. A stateful firewall will not only monitor the state of the TCP connection, but also the sequence numbers. Stateful firewalls accomplish this by keeping a session table, or state table.

CCNP Certification / BSCI Exam:

Which of the following ISIS router types can an L1/L2 router not form an adjacency with?

A. L2 in a different area

B. L1 in a different area

C. L1/L2, regardless of area

D. L1, regardless of area

Answer: B, D. L1/L2 routers can form adjacency with any L1 in the same area, L1/L2 in any area, and L2 in any area.

CCNP Certification / BCMSN Exam:

Which of the following are Uplinkfast restrictions?

A. Takes 1 - 3 minutes to transition

B. Cannot be configured on a root switch

C. Cannot be configured on a per-VLAN basis

D. Does not run on Cisco switches without special IOS add-on

Answer: B, C. Uplinkfast takes seconds, not minutes, and there's no IOS "add-on".

CCNP / ONT Exam:

Cisco recommends that you disable compression if the CPU usage reaches what percentage?

Answer: 40%.

More questions later today, and be sure to read today and yesterday's blog posts for links to new CCNA/CCNP videos and a new CCNA Security tutorial!

To your success,

Chris Bryant
CCIE #12933

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