Netgear Switch L3 User Manual download pdf (Page 261)

7000 Series L3 Managed Switch Reference Manual for Software v2.0

Glossary C-25

USP

An abbreviation that represents Unit, Slot, Port.

UTP

Unshielded twisted pair is the cable used by 10BASE-T and 100BASE-Tx Ethernet networks.

Virtual Local Area Network

Operating at the Data Link Layer (Layer 2 of the OSI model), the VLAN is a means of parsing a single

network into logical user groups or organizations, as if they physically resided on a dedicated LAN segment

of their own. In reality, this virtually defined community may have individual members peppered across a

large, extended LAN. The VLAN identifier is part of the 802.1Q tag, which is added to an Ethernet frame by

an 802.1Q-compliant switch or router. Devices recognizing 802.1Q-tagged frames maintain appropriate

tables to track VLANs. The first three bits of the 802.1Q tag are used by 802.1P to establish priority for the

packet.

Virtual Router Redundancy Protocol

VRRP specifies an election protocol that dynamically assigns responsibility for a virtual router to one of the

VRRP routers on a LAN. The VRRP router controlling the IP address(es) associated with a virtual router is

called the Master, and forwards packets sent to these IP addresses. The election process provides dynamic

fail-over in the forwarding responsibility should the Master become unavailable. This allows any of the

virtual router IP addresses on the LAN to be used as the default first hop router by end-hosts. The advantage

gained from using VRRP is a higher availability default path without requiring configuration of dynamic

routing or router discovery protocols on every end-host.

VLAN

See “Virtual Local Area Network” on page 25.

VRRP

See “Virtual Router Redundancy Protocol” on page 25.

WAN

See “Wide Area Network” on page 26.

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Netgear Switch L3 User Manual Page 261