Glossary H


Gigabit EtherChannel

See: Fast EtherChannel.

Gigabit Ethernet

1000Mbps version of the IEEE 802.3. FastEthernet offers a speed increase of 10 times that of the 10BaseT Ethernet specification while preserving qualities such as frame format, MAC, mechanisms, and MTU.


Gateway Load Balancing Protocol: A protocol designed to provide redundancy of the client default gateway by using virtual addresses. In addition, the use of virtual MAC addresses allows all routers in a group to forward data. An alternative to HSRP. See also: AVF, AVG, and HSRP.


Get Nearest Server: On an IPX network, a request packet sent by a customer for determining the location of the nearest active server of a given type. An IPX network client launches a GNS request to get either a direct answer from a connected server or a response from a router disclosing the location of the service on the internetwork to the GNS. GNS is part of IPX and SAP. See also: IPX and SAP.


A process that activates an interface that has been deactivated by the pruning process. It is initiated by an IGMP membership report sent to the router.


Generic Routing Encapsulation: A tunneling protocol created by Cisco with the capacity for encapsulating a wide variety of protocol packet types inside IP tunnels, thereby generating a virtual point-to-point connection to Cisco routers across an IP network at remote points. IP tunneling using GRE permits network expansion across a single-protocol backbone environment by linking multiprotocol subnetworks in a single-protocol backbone environment.

guard band

The unused frequency area found between two communications channels, furnishing the space necessary to avoid interference between the two.

CCNP. Building Cisco Multilayer Switched Networks Study Guide (642-811)
CCNP: Building Cisco Multilayer Switched Networks Study Guide (642-811)
ISBN: 078214294X
EAN: 2147483647
Year: 2002
Pages: 174
Authors: Terry Jack © 2008-2017.
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