Cisco 6500 - Catalyst Series 10 Gigabit EN Interface Module Expansion Руководство по решению - Страница 13

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Glossary

Frame

The basic unit of Ethernet data traffic. An Ethernet frame can vary in size from

a minimum length of 64 bytes to a maximum length of 1522 bytes. An Ethernet

frame contains the Ethernet destination address, Ethernet source address,

802.1Q/1p fields, and TCP/IP packet.

Gigabit Ethernet

An extension of the Ethernet standard, offering speeds of 1 Gbps. That equals

1,000 Mbps —or 100 times the speed of standard Ethernet. See also Bandwidth,

Ethernet, and Fast Ethernet.

Hub

A device that interconnects clients and servers, simply repeating or amplifying the

signals between them. Hubs act as wiring "concentrators" in networks based on

star topologies, rather than bus topologies, in which computers are daisy-chained

together. See also Switch.

Inline Power

Inline power is 48-volt DC power delivered to terminal devices such as IP phones

over standard network cables, eliminating the need for separate power sources

such as wall outlets.

Internet

A massive global network, interconnecting countless computers and networks

worldwide. It is accessible from any computer with a modem or router connection

and the appropriate software.

Internet Protocol. A network layer protocol in the TCP/IP stack offering a connec-

tionless internetwork service. IP provides features for addressing, type-of-service

specification, fragmentation and reassembly, and security.

IP Routing

Unlike static routing, where traffic patterns are established by the network admin-

istrator and must be manually adjusted, IP routing is dynamic. When a packet

begins its journey through the network, its entire route is not known. Instead,

it progresses through the network one "hop" at a time, and at each interval the

network automatically calculates the ideal route to the next stop along the way.

This improves network performance and availability.

IP Telephony

The transmission of voice and fax telephone calls over data networks using the

Internet Protocol.

IP Video

The transmission of video images over data networks using the Internet Protocol.

LAN

Local-area network. Typically, a network or group of network segments confined

to one building or a campus. See also WAN (Wide Area Network).