Monday, August 25, 2008

It's Monday, August 24, and it's time for the answers to Saturday's questions!

Be sure to read today's other blog posts for more practice exams and free tutorials, including a new CCNA Security tutorial!Here are today's questions.....

CCNA Certification And CCENT Certification:

We love redundancy, and the following switching diagram certainly gives us that!




Three questions for you:

What potential issue does this topology pose?

What protocol can help avoid that issue?

Assuming the switches are running at their defaults, what do we need to do to enable that protocol?

Answers: If these redundant paths are all open at the same time, we have the potential for switching loops to form. The Spanning-Tree Protocol (STP) helps to prevent these loops. If these Cisco switches are at their default, we don't need to do anything to enable STP - it's enabled by default.

CCNA Security Certification / CCNP ISCW Exam:

What is the net effect of the following configuration?

R1(config)#access-list 110 permit tcp any 10.0.0.0 0.255.255.255

R1(config)#ip tcp intercept list 110

Answer: To configure an ACL to define the source and destination of packets that should be subject to TCP Intercept, write the ACL and then apply it with the ip tcp intercept list command. Most likely, you'll specify a source of "any", as I did in the above example.


CCNP Certification / BSCI Exam:

What's the main difference between the following two BGP community values?

NO-EXPORT

NO-ADVERTISE

Answer:

NO-EXPORT: Marking a route with this community attribute prevents it from being advertised to an eBGP peer.


NO-ADVERTISE: Taking the previous community one step further, this community attribute prevents the route from being advertised to ANY other router.


CCNP Certification / BCMSN Exam:

What command will assign a MAC address of 11-22-33-44-55-66 to the virtual router in HSRP group 5?

Answer: On rare occasions, you may have to change the MAC address assigned to the virtual router. This is done with the standby mac-address command. Just make sure you're not duplicating a MAC address that's already on your network!


R2(config-if)#standby 5 mac-address 0000.1111.2222


CCNP / ONT Exam: (My ONT Study Package is now available - today's the last day to save money with my introductory discount!)

What's the basic purpose of Voice Activity Detection?

Answer: VAD detects voice activity, and perhaps more importantly, it detects when there is no voice activity. When there is no talking on a call using VAD, no audio packets are transmitted. Studies show that a normal conversation is 35 - 40% silence, VAD can give us big-time bandwidth savings as well as cutting down on overall traffic.

I'll have new questions here on the blog later today along with at least one new practice exam.

In the meantime, check today's other blog posts for new CCNA Security tutorials and a new CCNA / CCENT practice exam!

To your success,

Chris Bryant
CCIE #12933
http://www.thebryantadvantage.com/

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