Wednesday, July 23, 2008

Welcome back! It's Wednesday, July 23, and here are the answers to yesterday's Cisco practice exam questions!

CCNA Certification:

In the world of wireless networking, what's the basic difference between an ESS and a BSS?

Answer: While a Basic Service Set (BSS) will have a single AP, Extended Service Set WLANs (ESS) have multiple access points.

CCENT Certification:

Give the port numbers for each of these TCP-based protocols. (Answers are now listed.)

FTP, port 20 and 21
SMTP, port 25
Telnet, port 23
HTTP, port 80
DNS, port 53
POP3, port 110
NNTP, port 119

CCNA Security Certification / CCNP ISCW Exam:

In SDM, what does an asterisk indicate when it's used in a graphical representation of an ACL?

Answer: An asterisk represents the ACL option "any".

CCNP Certification / BSCI Exam:

What is the shortest possible legal representation of the following IP version 6 address?


Answer: If you have consecutive fields of zeroes, as that address does, they can be expressed with two colons.

It doesn't matter if you have two fields or eight, you can simply type two colons and that will represent all of the consecutive fields.

The key here is that you can only do this once in an IPv6 address. This is zero compression.

Original format: 1234:1234:0000:0000:0000:0000:3456:3434

Using zero compression: 1234:1234::3456:3434

CCNP Certification / BCMSN Exam:

The use of Dynamic ARP Inspection is used to defend our network's switches against what network attack?

Answer: DAI is used on switches to fight man-in-the-middle attacks. I'll have an illustrated tutorial on this subject on the main site next week.

CCNP / ONT Exam:

What are the four basic steps of the analog-to-digital signal conversion process?

Analog-to-digital steps:

Sample the analog signal
Quantize that sample
Encode the signal
Compress the samples (optional, helps to conserve bandwidth)

Be sure to read today's other blog posts for exciting news about the new CCNA certifications, especially the CCNA Security certification! I also have a new CCNA Security practice exam waiting for you on that page, along with the first in a series of SDM tutorials. Enjoy!

To your success,

Chris Bryant
CCIE #12933

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