Administering Cisco QOS for IP Networks by Wayne Lawson

By Wayne Lawson

AVVID (Architecture for Voice, Video, and built-in Data), the most recent improvement from Cisco platforms is redefining the way in which companies converse. AVVID permits companies to transmit voice, info, and video over a unmarried built-in structure, while long ago 3 separate platforms have been required.Administering Cisco AVVID purposes is a qualified reference detailing the suggestions, strategies, and techniques for using Cisco software program to configure and keep Cisco networks and infrastructures. It contains thorough discussions of serious issues equivalent to, Cisco CallManager model 3.0, Cisco Unified Open community trade 4.1E (uOne), WebLine and GeoTel product software program, Cisco QoS coverage Manger 1.1 in addition to many different QoS gains, and Cisco IOS network-wide software program. permits IP expert to get forward during this becoming box.

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It is important to understand what a DoS attack is before we attempt to minimize its impact. A DoS attack is an attack on a network that monopolizes the network and server resources so that no other host can participate on the network, or, if they do, the network or service becomes very slow. There are three general types of DoS attacks : Smurf, SYN floods, and Fraggle. com 33 110_QoS_01 34 2/13/01 6:35 PM Page 34 Chapter 1 • Cisco IOS Feature Review to tie up the servers and the network. The Fraggle attack uses a flood of broadcasts, like a Smurf attack, but it uses UDP echo requests instead of ICMP echo requests.

We would be wasting IP addresses if we could not use a /32 mask. Standard Access Control Lists (ACLs) Network administrators have always faced the dilemma of allowing appropriate access while at the same time denying unwanted traffic. Access Control Lists (ACLs) enable administrators to shape and manage network traffic, prioritize queuing groups, route and service filtering, as well as heighten network security. All of these issues are critical when designing a network or administering an existing network.

Extended Access Control Lists (ACLs) When network requirements extend beyond the capabilities of standard Access Control Lists, you may need to implement extended Access Control Lists to meet the needs of your network. Extended Access Control Lists are more robust and granular than standard Access Control Lists, which permits network administrators to implement more jurisdictions over a network. Extended Access Control Lists provide added capability by offering filtering of both source and destination addresses.

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