PLANET SGS-5220-24P2X - Manual (Page 371)

User’s Manual of SGS-5220 Series
Virtual LAN. A method to restrict communication between switch ports. VLANs can be used for the following
applications:
VLAN unaware switching: This is the default configuration. All ports are VLAN unaware with Port VLAN ID 1 and
members of VLAN 1. This means that MAC addresses are learned in VLAN 1, and the switch does not remove or
insert VLAN tags.
VLAN aware switching: This is based on the IEEE 802.1Q standard. All ports are VLAN 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 VLAN to which the frame belongs.
Voice VLAN
Voice VLAN is VLAN configured specially for voice traffic. By adding the ports with voice devices attached to voice
VLAN, we can perform QoS-related configuration for voice data, ensuring the transmission priority of voice traffic and
voice quality.
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 using 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
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