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aware. Ports connected to VLAN aware switches are members of multiple VLANs and
transmit tagged frames. Other ports are members of one VLAN, set up with this Port VLAN
ID, and transmit untagged frames.
Provider switching: This is also known as Q-in-Q switching. Ports connected to subscribers
are VLAN unaware, members of one VLAN, and set up with this unique Port VLAN ID. Ports
connected to the service provider are VLAN aware, members of multiple VLANs, and set up
to tag all frames. Untagged frames received on a subscriber port are forwarded to the provider
port with a single VLAN tag. Tagged frames received on a subscriber port are forwarded to the
provider port with a double VLAN tag.
VLAN ID
VLAN ID
is a 12-bit field specifying the
W
WEP
WEP
is an acronym for Wired Equivalent Privacy. WEP is a deprecated algorithm to secure
IEEE 802.11 wireless networks. Wireless networks broadcast messages use radio, so are more
susceptible to eavesdropping than wired networks. When introduced in 1999, WEP was
intended to provide confidentiality comparable to that of a traditional wired network
(Wikipedia).
WiFi
WiFi
is an acronym for Wireless Fidelity. It is meant to be used generically when referring of
any type of 802.11 network, whether 802.11b, 802.11a, dual-band, etc. The term is
promulgated by the Wi-Fi Alliance.
WPA
WPA
is an acronym for Wi-Fi Protected Access. It was created in response to several serious
weaknesses researchers had found in the previous system , Wired Equivalent Privacy (WEP).
WPA implements the majority of the IEEE 802.11i standard, and was intended as an
intermediate measure to take the place of WEP while 802.11i was prepared. WPA is
specifically designed to also work with pre-WPA wireless network interface cards (through
firmware upgrades), but not necessarily with first generation wireless access points. WPA2
implements the full standard, but will not work with some older network cards (Wikipedia).
WPA-PSK
WPA-PSK
is an acronym for Wi-Fi Protected Access - Pre Shared Key. WPA was designed to
enhance the security of wireless networks. There are two flavors of WPA: enterprise and
personal. Enterprise is meant for use with an IEEE 802.1X authentication server, which
distributes different keys to each user. Personal WPA utilizes less scalable 'pre-shared key'
(PSK) mode, where every allowed computer is given the same passphrase. In PSK mode,
security depends on the strength and secrecy of the passphrase. The design of WPA is based on
VLAN
to which the frame belongs.
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