FTP: An older method used for transferring files from one computer to another, but you still see it in use today
Full duplex: The capacity of devices on either side of a networking link to communicate with each other at the exact same time
Fully qualified domain name: When you combine all the parts of a domain together
H
Half-duplex:It means that, while communication is possible in each direction, only one device can be communicating at a time
Handshake: A way for two devices to ensure that they're speaking the same protocol and will be able to understand each other
Header checksum field: A checksum of the contents of the entire IP datagram header
Header length field: A four bit field that declares how long the entire header is. It is almost always 20 bytes in length when dealing with IPv4
Hexadecimal: A way to represent numbers using a numerical base of 16
Hub: It is a physical layer device that broadcasts data to everything computer connected to it
I
IANA: The Internet Assigned Numbers Authority, is a non-profit organization that helps manage things like IP address allocation
Identification field: It is a 16-bit number that's used to group messages together
Instantiation: The actual implementation of something defined elsewhere
Interface: For a router, the port where a router connects to a network. A router gives and receives data through its interfaces. These are also used as part of the routing table
Interior gateway: Interior gateway protocols are used by routers to share information within a single autonomous system
Internet Protocol (IP): The most common protocol used in the network layer
Internet Service Provider (ISP): A company that provides a consumer an internet connection
Internetwork: A collection of networks connected together through routers - the most famous of these being the Internet
