Tuesday, January 20, 2009

CCNA New DHCP Group of Four Questions updated on 09-Jan-2009

(Updated from real CCNA exam on 09-Jan-2009)

Refer to the exhibit. Using the information shown, answer the questions?

Question 1:

All hosts in the networks have been operational for several hours when the DHCP server goes down. What happens to the hosts that have obtained service from the DHCP server?

A - The hosts will not be able to communicate with any other hosts.
B - The hosts will continue to communicate normally for a period of time.
C - The hosts will be able to communicate with hosts outsides their own network
D - The hosts will only be able to communicate with other hosts by IP address not by hostname

Answer: B

Explanation:

DHCP often uses dynamic allocation mechanism to save IP addresses, which assigns an IP address to a client for a limited period of time. So when the DHCP server goes down, that client can still use the allocated IP address for a period of time


Question 2:

What is the purpose of the DHCP server?

A - to provide storage for email
B - to translate URLs to IP addresses
C - to translate IPv4 addresses to MAC addresses
D - to provide an IP configuration information to hosts

Answer: D

Explanation:

The main purpose of the DHCP server is to provide IP configuration parameters to hosts such as the default gateway, domain name, Domain Name System (DNS) server...


Question 3:

How is the message sent from a PC2 when is first powers on and attempts to contact the DHCP Server?

A - Layer 3 unicast
B - Layer 3 broadcast
C - Layer 3 multicast
D - Without any Layer 3 encapsulation


Answer: B

Explanation:

When a client boots up for the first time, it transmits a DHCPDISCOVER message on its local physical subnet. Because the client has no way of knowing the subnet to which it belongs, the DHCPDISCOVER is an all-subnets broadcast (destination IP address of 255.255.255.255, which is a layer 3 broadcast address). The client does not have a configured IP address, so the source IP address of 0.0.0.0 is used.
Question 4:
What is the default behavior of R1 when PC1 requests service from DHCP server?

A - Drop the request
B - Broadcast the request to P4S2 and P4S3
C - Forward the request to P4S2
D - Broadcast the request to P452, P4S3 and ISP

Answer: A

Explanation:

When PC1 requests service from DHCP server (for example, it requests an IP address), it sends a broadcast packet. But R1 router, by default, will not forward broadcast packet and drop it.

For your information, if you want to use the DHCP server from another network (like in this case) you can use the ip helper-address command which will make the router forward UDP broadcasts.

In the real exam you will be taken to a LAB simulation environment but it is, in fact, just a group of 4 multi-choice questions!

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Cisco WAAS v4.0.13 Vol1 - Student Guide

Download Link:

Scanned version of the official student guide (1st volume of 2)


Cisco Waas official student guide


Cisco Waas Lab Guide



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Cisco Pedia 3.1 IOS Command Dictionary

Cisco Pedia 3.1 IOS Command Dictionary

CCNA / CCNP / CCIE / Cisco Networking Commands 4,6 Mb

Ciscopedia is a collection of commands that are taught in Cisco Networking Academy courses. It includes information on where, when, why, and how to use the commands.It also includes examples for simple configurations.

Download Link:

Cisco Pedia 3.1 IOS Command Dictionary


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CBT CCNA Security 640-553

Are you an IT Pro responsible for network security? Do you have CCNA certification and want to take the next step in network security? Are you working towards CCSP certification? If any of these are you, this is the training you’re looking for.

Jump into security with Jeremy Cioara’s Cisco CCNA Security video series. Jeremy puts you in the mind of hackers and intruders and shows you how to defeat these black hats. Soon you’ll be recognizing different types of attackers and threats and eliminating the damage that can follows security breaches.

You’ll learn all about your security enemies –whether they’re hackers, phreakers, hacktivists, hobby hackers or script kiddies. And you’ll learn how these bad guys:

* Investigate your network
* Identify and target your operating system and applications
* Break into your system
* Steal logins, user names and passwords
* Create network backdoors so they can mount future attacks

Cisco Security gives you lots of great tools for discovering and defeating attackers. Self-Defending Network (SDN) helps you automatically identify threats, both internal and external. MARS (Monitoring Analysis & Response System) analyzes threats and identifies false alarms. In fact, Cisco Security provides you with tons of network protection, but doesn’t bury you with security alerts.

Jeremy’s videos move from one “cool topic” to the next — showing you the big picture involved in securing your network. By the time you’ve finished watching the full series, you’ll have a terrific foundation in Cisco security. And you’ll be respected for the confidentiality, integrity and availability that you bring to your organization’s network data.

This training is mapped to Cisco CCNA Security exam 640-533 IINS, so you’ll be ready to pass the certification test.


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Cisco CCNA Security exam 640-533 IINS part01

Cisco CCNA Security exam 640-533 IINS part02

Cisco CCNA Security exam 640-533 IINS part03

Cisco CCNA Security exam 640-533 IINS part04

Cisco CCNA Security exam 640-533 IINS part05

Cisco CCNA Security exam 640-533 IINS part06

Cisco CCNA Security exam 640-533 IINS part07

Cisco CCNA Security exam 640-533 IINS part08

Cisco CCNA Security exam 640-533 IINS part09

Cisco CCNA Security exam 640-533 IINS part10

Cisco CCNA Security exam 640-533 IINS part11

Cisco CCNA Security exam 640-533 IINS part12



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IPExpert CCIE Routing Switching V4

IPExpert CCIE Routing Switching Version 4.0.

The course is fast-paced, allowing you to learn details of topics, focusing on your specific areas of weakness, strengthen more familiar topics, and improve your speed. With the exam’s one-day format, it is critical that you master the basic elements such as switching technologies, IGPs, BGP and QoS prior to your lab attempt. Each student will have access to their own vRack of equipment consisting of 2800 and 3800 series routers, quad Catalyst 3550/3560s and the needed media types that you will see on your lab exam.


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password : netbks.com





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Cisco Security Agent v5.2.245

Cisco Security Agent (CSA) is a security software agent that provides threat protection for server and desktop computing systems. CSA agents can be managed by CiscoWorks VMS Management Center for Cisco Security Agents or can be standalone agents running on Cisco IP Communications application servers. Standalone agents for Cisco IP Communications application servers must be manually installed on the IP Communications application server.
A vulnerability exists in CSA agents that can allow a privilege escalation through locally executed software, providing a normal user or attacker with local system level privileges on a Windows workstation or server running managed or standalone CSA 4.5.0 or 4.5.1 agents.
Download Link:
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