V, W, X
VCSTACK Virtual Chassis Stacking - A feature of some Allied Telesis switches where through configuration, two or more switches act as a single switch
VLAN Virtual Local Area Network or Virtual LAN - Configured through software, a party of hosts who have similar sets of requirements communicate as if they belonged to the same broadcast domain, despite the location of the group of hosts
VRRP Virtual Router Redundancy Protocol - A router based application that allows a group of routers to act as one.
WI-Fi Wireless networking standard IEEE802.11. Most used varieties are 802.11.b (11Mb/s), 802.11.g (54Mb/s) and 802.11.N (up to 150Mb/s)
Wirespeed - The rate of data transfer/bandwidth that a networking device can achieve at the physical wire level.
XFP 10 Gigabit Small Form Factor Pluggable.