* Flow control: adjust and confirm data flow rate for successful transmission.
* Error Control: a way to recover corrupted data .
Telnet = 23 and DNS = 53
using telnet we can take command mode in the system , it work's under port no 23
A socket is an abstraction that represents an endpoint of communication. Most applications that consciously use TCP and UDP do so by creating a socket of the appropriate type and then performing a series of operations on that socket. The operations that can be performed on a socket include control operations (such as associating a port number with the socket, initiating or accepting a connection on the socket, or destroying the socket) data transfer operations (such as writing data through the socket to some other application, or reading data from some other application through the socket) and status operations (such as finding the IP address associated with the socket).
TCP includes several mechanisms that attempt to sustain good data
transfer rates while avoiding placing excessive load on the
network. TCP's "Slow Start", "Congestion Avoidance", "Fast
Retransmit" and "Fast Recovery" algorithms are summarised in RFC
2001. TCP also mandates an algorithm that avoids "Silly Window
Syndrome" (SWS), an undesirable condition that results in very
small chunks of data being transferred between sender and
receiver. SWS Avoidance is discussed in RFC 813. The "Nagle
Algorithm", which prevents the sending side of TCP from flooding
the network with a train of small frames, is described in RFC
896.
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