Cisco Systems Intelligent Switching manual Layer, Multicast, Packet, Router, Server

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Layer 2

Glossary

Layer 2

The data link layer in the OSI Model. For Ethernet, this applies to the Ethernet frame that contains the Ethernet destination address, Ethernet source address and 802.1Q/1p fields. See also Layer 3.

Layer 3

The physical layer in the OSI Model. For TCP/IP, this applies to the IP packet that contains the IP destination address, IP source address and ToS byte. See also Layer 2.

Multicast

Single packet copied by the network and sent to a specific subset of network addresses.

Packet

A block of data with a “header” attached that can indicate what the packet con- tains and the destination where it is headed. Think of a packet as a data envelope, with the header acting as an address.

QoS

Quality of service. A set of intelligent features that enables the network to classify, mark, and prioritize traffic, reducing congestion and bringing order to the flow of data and services.

Router

A device that moves data between different network segments and can look into a packet header to determine the best path for the packet to travel. Routers can connect network segments that use different protocols. They also allow all users in a network to share a single connection to the Internet or WAN.

Server

A computer or even a software program that provides clients with services —such as file storage (file server), programs (application server), printer sharing (print server), fax (fax server) or modem sharing (modem server). See also Client.

Switch

A device that improves network performance by segmenting the network. When a switch port receives data packets, it forwards those packets only to the appropriate port for the intended recipient. This capability further reduces competition for bandwidth between the clients, servers, or workgroups connected to each switch port. See also Hub.

WAN

Wide-area network. Typically refers to a network that connects devices over greater distances, such as geographical regions. A WAN often connect two or more LANs together. See also LAN (Local Area Network).

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Contents Intelligent Switching for the Evolving Network Cisco Catalyst Switching Solutions Guideadaptation, and expansion Intelligent switchingfor the evolving network Easing network migration Catalyst An agent that precipitates or acceleratesanything? Q Why change A Because there really isn’t any alternativeQ Why start with intelligent switching? A Because of all the changes after thatand becoming more so every day Q How important A QoS is very importantis QoS? Q What about A Security needs to evolve withQ Why make the move to Gigabit Ethernet? A Because networks need room to growMedium-Sized Network Quality of ServiceNetwork Intelligence-from the Core to the Edge Small-Business NetworkA Lots of reasons-as lots of people can attest Q Why use Cisco Catalyst switches to ease network evolution?A Not at all-that’s a key advantage of these switches Q But anything this advanced must be difficult to deployA They’re part of the same team, just playing different positions Chassis Cisco CatalystStackables Deployment for IP Telephony and Wireless LAN Access Catalyst Wiring Closet Deployment ScenariosDeployment with Stackables Functionality For more information, contact Cisco, your Cisco reseller, or visit ConclusionBackbone AVVIDAvailability BandwidthGigabit Ethernet Inline PowerFrame InternetMulticast SwitchLayer PacketCatalyst An agent that precipitates or accelerates a reaction, development, or changeFor more information Americas Headquarters Corporate HeadquartersEuropean Headquarters Asia Pacific Headquarters