Payload: The actual data being transported, which is everything that isn't a header
Physical layer: It represents the physical devices that interconnect computers
Port: It is a 16-bit number that's used to direct traffic to specific services running on a networked computer
Preamble:The first part of an Ethernet frame, it is 8 bytes or 64 bits long and can itself be split into two sections
Presentation layer: It is responsible for making sure that the unencapsulated application layer data is actually able to be understood by the application in question
Protocol field:A protocol field is an 8-bit field that contains data about what transport layer protocol is being used
Protocol: A defined set of standards that computers must follow in order to communicate properly is called a protocol
PSH flag: One of the TCP control flags. PSH is short for push. This flag means that the transmitting device wants the receiving device to push currently- buffered data to the application on the receiving end as soon as possible
R
Router: A device that knows how to forward data between independent networks
Routing protocols: Special protocols the routers use to speak to each other in order to share what information they might have
RST flag: One of the TCP control flags. RST is short for reset. This flag means that one of the sides in a TCP connection hasn't been able to properly recover from a series of missing or malformed segments
S
Sequence number: A 32-bit number that's used to keep track of where in a sequence of TCP segments this one is expected to be
Server or Service: A program running on a computer waiting to be asked for data
Server: A device that provides data to another device that is requesting that data, also known as a client
Service type field: A eight bit field that can be used to specify details about quality of service or QoS technologies
