Friday, August 29, 2008

It's Friday, August 29, and here are the answers to yesterday's Cisco practice exam questions!

Be sure to read today's other blog posts for links to new practice exam and tutorials, including my Cisco Certification Tutorials page - over 200 Cisco tutorials, practice exams, and articles are just waiting for you!

Here are the answers to yesterday's questions, which were all short answer.

CCNA Certification And CCENT Certification:

Short answer: Describe the potential issue created by the following command.

R2#debug ip packet
IP packet debugging is on

Answer: This is a powerful debug that can result in overwhelming the router's CPU if there's quite a bit of traffic running when you activate the debug. You may not even be able to enter undebug all !

CCNA Security Certification / CCNP ISCW Exam:

Short answer: Define the term dictionary attack.

Answer: You know how some programs require alphanumeric passwords, and / or numbers to appear in the password as well? That's because the average person will set a non-numeric password of 7 characters or less on average, and it's that tendency that a dictionary attack attempts to take advantage of.

A basic dictionary attack attempts to guess a key or password by using words with 7 characters or less. There are different kinds of dictionary attacks, and I'll have them covered in my upcoming CCNA Security Study Guide.

If you want to do some reading on them now, visit this Wikipedia page:

Wikipedia Dictionary Attack Page

CCNA Wireless:

Describe the major purpose of both Yagi and Omni antennae, and the main difference between the two with regards to signal strength.

Answer: A Yagi antenna (technically, the full name is "Yagi-Uda antenna") sends its signal in a single direction, which means it must be aligned correctly and kept that way. Yagi antennas are sometimes called directional antennas, since they send their signal in a particular direction. In contrast, an Omni antenna sends a signal in all directions.

The unidirectional signal a Yagi antenna sends makes it particularly helpful in bridging the distance between Wireless Access Points. The multidirectional signal sent by Omni antennas help connect hosts to WAPs, including roaming laptop users.

CCNA Voice:

Short answer: Define the term packetization period.

Answer: Packetization period is the actual amount of voice that's encapsulated in each packet. Measured in milliseconds, the normal packetization period is 20 ms. If the packetization period is shortened, the resulting packets are smaller; if this period is lengthened, the packets will be larger.

CCNP Certification / BSCI Exam:

What OSPF device(s) send Type 2 LSAs?

Answer: Type 2 LSAs are sent out by the DR only.

CCNP Certification / BCMSN Exam:

Name the three violation options available with port security, and name the action taken by the switch for each option.

Answer: The default is shutdown, and it's just what it sounds like - the port is placed into error-disabled state and manual intervention is needed to reopen the port. An SNMP trap message is also generated.

Protect mode simply drops the offending frames, while restrict mode drops the offending frames and will generate both an SNMP trap notification and syslog message regarding the violation.

CCNP / ONT Exam: (My ONT Study Package is now available!)

You're using the WCS to add a wireless controller to your network. What menu path should you take?

Answer: Select Configure, then Controllers, then Add Controllers from the drop-down box, as shown in these illustrations from my ONT Study Package.

I'll have new questions for you later today!

In the meantime, spend some time at my Cisco CCNA, CCNP, and CCENT tutorials page - that page has links to over 200 Cisco practice exams, tutorials, artciles, and videos are on the way
To your success,

Chris Bryant
CCIE #12933

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