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information. Each of these pieces of information is known as TLV.
TKIP
TKIP
is an acronym for Temporal Key Integrity Protocol. It used in WPA to replace WEP with
a new encryption algorithm. TKIP comprises the same encryption engine and RC4 algorithm
defined for WEP. The key used for encryption in TKIP is 128 bits and changes the key used
for each packet.
U
UDP
UDP
is an acronym for User Datagram Protocol. It is a communications protocol that uses the
Internet Protocol (IP) to exchange the messages between computers.
UDP is an alternative to the Transmission Control Protocol (TCP) that uses the Internet
Protocol (IP). Unlike TCP, UDP does not provide the service of dividing a message into packet
datagrams, and UDP doesn't provide reassembling and sequencing of the packets. This means
that the application program that uses UDP must be able to make sure that the entire message
has arrived and is in the right order. Network applications that want to save processing time
because they have very small data units to exchange may prefer UDP to TCP.
UDP provides two services not provided by the IP layer. It provides port numbers to help
distinguish different user requests and, optionally, a checksum capability to verify that the data
arrived intact.
Common network applications that use UDP include the Domain Name System (DNS),
streaming media applications such as IPTV, Voice over IP (VoIP), and Trivial File Transfer
Protocol (TFTP).
UPnP
UPnP
is an acronym for Universal Plug and Play. The goals of UPnP are to allow devices to
connect seamlessly and to simplify the implementation of networks in the home (data sharing,
communications, and entertainment) and in corporate environments for simplified installation
of computer components
User Priority
User Priority
V
VLAN
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
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
is a 3-bit field storing the priority level for the 802.1Q frame.
1 and members of VLAN 1. This means that MAC addresses are learned
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