Collision domain: A network segment where only one device can communicate at a time
Computer networking: The full scope of how computers communicate with each other
Connection-oriented protocol: A data-transmission protocol that establishes a connection at the transport layer, and uses this to ensure that all data has been properly transmitted
Connectionless protocol: A data-transmission protocol that allows data to be exchanged without an established connection at the transport layer. The most common of these is known as UDP, or User Datagram Protocol
Copper cable categories: These categories have different physical characteristics like the number of twists in the pair of copper wires. These are defined as names like category (or cat) 5, 5e, or 6, and how quickly data can be sent across them and how resistant they are to outside interference are all related to the way the twisted pairs inside are arranged
Crosstalk:Crosstalk is when an electrical pulse on one wire is accidentally detected on another wire
Cyclical Redundancy Check (CRC): A mathematical transformation that uses polynomial division to create a number that represents a larger set of data. It is an important concept for data integrity and is used all over computing, not just network transmissions
D
Data offset field:The number of the next expected segment in a TCP packet/datagram
Data packet: An all-encompassing term that represents any single set of binary data being sent across a network link
Datalink layer: The layer in which the first protocols are introduced. This layer is responsible for defining a common way of interpreting signals, so network devices can communicate
Demarcate:To set the boundaries of something
Demarcation point: Where one network or system ends and another one begins
Demultiplexing: Taking traffic that's all aimed at the same node and delivering it to the proper receiving service
