TCP segment: A payload section of an IP datagram made up of a TCP header and a data section
TCP window: The range of sequence numbers that might be sent before an acknowledgement is required
Time-To-Live field (TTL): An 8-bit field that indicates how many router hops a datagram can traverse before it's thrown away
Time-To-Live field (TTL): An 8-bit field that indicates how many router hops a datagram can traverse before it's thrown away
Top Level Domain (TLD):The top level of the DNS or the last part of a domain name. For example, the “com” in www.weather.com
Total hops: The total number of devices data passes through to get from its source to its destination. Routers try to choose the shortest path, so fewest hops possible. The routing table is used to keep track of this
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
Two-factor authentication: A technique where more than just a username and password are required to authenticate. Usually, a short-lived numerical token is generated by the user through a specialized piece of hardware or software
TXT record:It stands for text and was originally intended to be used only for associating some descriptive text with a domain name for human consumption
Types of DNS servers: There are five primary types of DNS servers; caching name servers, recursive name servers, root name servers, TLD name servers, and authoritative name servers
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