Monday, October 27, 2008

It's Monday, October 27, and here are the answers to Saturday's questions!

Only 4 days until the release of my CCNA Security Exam Study Package- click that link to reserve the lowest price possible AND start studying immediately with the downloadable Preview Edition!

CCNA Certification And CCENT Certification:

You've having no trouble sending pings around your Frame Relay hub-and-spoke configuration, but you can't get RIP updates to arrive successfully at any of your routers. What's the most likely issue?

Answer: Since unicasts (pings) are going through and multicast/broadcast traffic is not, you likely left the broadcast option off the frame-relay map commands.

CCNA Security Certification / CCNP ISCW Exam:

Only 4 days until the release of my CCNA Security Study Package!

A Cisco IP Phone has some undesirable defaults when it comes to web access. What are they?

Answer: By default, no password is configured or required!

CCNP Certification / BSCI Exam:

What's the major difference between an OSPF Stub area and a Total Stub area?

Answer: With an OSPF stub area, you can have routes to other destinations in the area (O), inter-area routes (O IA), and a default inter-area route to reach the external destinations (O *IA).

With a total stub area, you'll see only routes to other networks in the total stub area (O) and a single default route used to reach all other destinations (O *IA).

CCNP Certification / BCMSN Exam:

Is there a difference between the actions taken by BPDU Guard and Root Guard when a port protected by either receives a BPDU?

Answer: Yes. And I should have asked you what that difference is! :)

If Root Guard detects a superior BPDU arriving on a port, that port is placed into root-inconsistent state.

If any BPDU comes in on a port that's running BPDU Guard, the port will be shut down and placed into error disabled state, shown on the switch as err-disabled.

CCNP / ONT Exam:

In Random Early Detection, what's the purpose of the Mark Probability Denominator?

Answer: RED will use three separate values to perform congestion detection:

Minimum Queue Threshold - This is when RED begins to drop packets.

Maximum Queue Threshold - At this level, RED is dropping as many packets as it can!

Mark Probability Denominator - Value used to decide by RED to decide exactly how many packets "as many packets as it can" is. For example, if the MPD is set to 100, one out of every 100 packets will be dropped when the queue average reaches the max queue threshold value.

More questions right here later today!

To your success,

Chris Bryant

CCIE #12933

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