Total length field: A 16-bit field that indicates the total length of the IP datagram it's attached to
Transmission Control Protocol (TCP): The data transfer protocol most commonly used in the fourth layer. This protocol requires an established connection between the client and server
Transport layer: The network layer that sorts out which client and server programs are supposed to get the data
Twisted pair cable: The most common type of cabling used for connecting computing devices. It features pairs of copper wires that are twisted together
U
Unicast transmission: A unicast transmission is always meant for just one receiving address
URG flag: One of the TCP control flags. URG is short for urgent. A value of one here indicates that the segment is considered urgent and that the urgent pointer field has more data about this
Urgent pointer field: A field used in conjunction with one of the TCP control flags to point out particular segments that might be more important than others
User Datagram Protocol (UDP): A transfer protocol that does not rely on connections. This protocol does not support the concept of an acknowledgement. With UDP, you just set a destination port and send the data packet
V
Virtual LAN (VLAN): It is a technique that lets you have multiple logical LANs operating on the same physical equipment
VLAN header: A piece of data that indicates what the frame itself is. In a data packet it is followed by the EtherType
Module 5 Glossary
New terms and their definitions: Course 2 Module 5
Ad-Hoc network: A network configuration without supporting network infrastructure. Every device involved with the ad-hoc network communicates with every other device within range, and all nodes help pass along messages
Asymmetric Digital Subscriber Line (ADSL): A device that establishes data connections across phone lines and different speeds for uploading and downloading data
