Port Numbers
Numbers that are assigned to the source and destination at Layer 4 to uniquely identify the communication
Conversation Multiplexing
The combining of many different conversations into one data stream
Segment
A block of application data created to facilitate network transport
TCP
A connection-oriented reliable protocol that uses a 3-way handshake
UDP
A connectionless protocol that has little overhead and is used for communication data such as voice and video
Best Effort Delivery
A data delivery method that has no service guarantee
Session
A connection between systems
Connection-Oriented
Used to describe the reliable nature of TCP. The connection refers to the 3-way handshake required in TCP before data transmission.
Flow control
A mechanism that is used with TCP to control the amount of traffic that is sent from the source to the destination
Datagrams
The name of the UDP PDU
Source port
A value between 1024 and 65535 used to uniquely identify the source application or process on a local host
Destination port
A port value that uniquely identifies the destination application
Well-known ports
Port numbers in the range of 1-1024 that identify network applications that are well known such as web, email, and remote login applications
Dynamic ports
Ports that are dynamically assigned to communication sessions as needed and are typically in the numerical range of 1024 to 65535
Netstat
A utility that tracks TCP connections on network hosts