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Sockets Programming in C using TCP/IP

Sockets Programming in C using TCP/IP TA: Awad A Younis Class: CS457 Fall 2014 Computer Networks: Consists of Machines Interconnected by communication channels Machines are Hosts and Routers Hosts run applications Routers forward information among communication channels Communication channels is a means of conveying sequences of bytes from one host to another (Ethernet, dial-up, satellite, etc.) Packets: Sequences of bytes that are constructed and interpreted by programs A packet contains Control information: oUsed by routers to figure out how to forward every packet. packet destination User data Protocol: An agreement about the packets exchanged by communicating programs and what they mean. A protocol tells how packets are structured owhere the distention information is located in the packet ohow big it is Protocols are designed to solve specific problems TCP/IP is such collection of solutions (protocol suite or family): oIP, TCP, UDP, DNS, ARP, HTTP, and many more How can we access the services provided by TCP/IP suite?

Server 1. Create a TCP socket using socket() 2. Assign a port number to the socket with bind() 3. Tell the system to allow connections to be made to that port using listen()

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