My Netwok Dictionary

Route summarization or aggregation,  is a mechanism used to design networks that are more flexible and perform better. With route summarization  or aggregation, in a hierarchical routing infrastructure, one route in a routing table represents many routes.

Although some routing protocols summarize only at the boundaries of major network numbers, others support route summarization (aggregation) at any bit boundary. Variable-length subnet masks enable routing protocols to summarize on bit boundaries.

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By Diane Teare, Catherine Paquet.

Published by Cisco Press.

Series: Self-Study Guide.

Description:

* Provides a thorough introduction to campus switched network construction, support, and security
* Explains the fundamentals of multilayer switched network design and specific design features such as Spanning Tree Protocol, quality of service (QoS), and high availability
* Covers virtual LAN (VLAN) and InterVLAN Routing implementation
* Incorporates wireless client access and configuring campus switches to support voice technologies
* Uses extensive configuration examples and diagrams to solidify the explanations of topics
* Presents self-assessment review questions, configuration exercises, chapter objectives and summaries, and study tips to ensure information recall

Dwonload:Builder Cisco Multilayer Switch Network(BMSN)

DHCP snooping is a security feature for filtering untrusted DHCP messages, and can protect clients on the network from peering up with an unauthorized DHCP server. When enabled, it builds a table of MAC address, IP address, lease time, binding type, and interface information .

There is also an important difference between trusted and untrusted interfaces when talking about DHCP snooping. . An untrusted interface is an interface that is configured to receive messages from outside the network or firewall. A trusted interface is an interface that is configured to receive only messages from within the network. Read the rest of this entry »

CCNP ONT Official Exam Certification Guide

by Amir S. Ranjbar - CCIE No. 8669

Publisher: Cisco Press
Pub Date: May 21, 2007
Print ISBN-10: 1-58720-176-3
Print ISBN-13: 978-1-58720-176-9

This  official study guide helps you master all the topics on the CCNP ONT exam, including

1. Implementing a voice-over-IP (VoIP) network
2. Implementing QoS on converged networks
3. Specific IP QoS mechanisms for implementing the DiffServ QoS model
4. AutoQoS
5. Wireless security
6. Basic wireless management

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It is important to note that the ip helper-address command does not just forward DHCP requests. In fact, although you can configure it to forward any UDP broadcast you want, by default it will forward UDP broadcast packets for several different UDP ports to the specified address. In some cases, this unwanted traffic can cause problems on the network or DHCP server. Read the rest of this entry »

The traditional role of routers in DHCP has been simply to act as a proxy device.DHCP proxy function is still the most common for routers.

Initial DHCP request comes from a client that typically doesn’t have an IP address, it must find the server using a Layer 2 broadcast. So, if the router was not able to function as a proxy for these broadcasts, it would be necessary to put a DHCP server on every network segment. Read the rest of this entry »