CNIT 344: TCP & UDP Operations

TCP is _______ and __________

connection oriented, reliable

UDP is __________ and _________

connection less, not reliable

What is SCTP?

New protocol designed to offer reliable transmission over connectionless network

What does TCP do?

Provides a reliable host-to-host connection

What does TCP include controls for?

initiation, basic prioritization, flow control, congestion avoidance, and termination of connection

What is a sequence number in TCP?

The identifier of the segment being transmitted

What is an acknowledgement number?

The value of the next sequence number expected to be received

What are the control fields in a TCP header?

URG, ACK, PSH, RST, SYN, FIN

What is a window in TCP headers?

The number of data bytes beginning with the one indicated in the ACK # field that this device is able to accept

What is a checksum in TCP?

A 16-bit one’s complement of the one’s complement sum of the segment

What does UDP provide?

Minimal capabilities to deliver segments to a given destination

Why is UDP worse than TCP?

It lacks nearly all of the robust mechanisms used in TCP