Course overview - som.csudh.edu

Course overview - som.csudh.edu

The transport layer Skills: Concepts: layered protocols, transport layer functions, TCP and UDP protocols, isochronous applications This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Where does this topic fit? Internet concepts Applications Technology (communication) Implications

Internet skills Application development Content creation User skills TCP/IP from the outside Application Program, for example, a Web client A TCP/IP network

Application Program, for Example, a Web server The transport layer Layer Function Application Do useful work like Web browsing, email, and file transfer

Transport Transport data between application programs running on two hosts Internet Route packets between networks (inter network) Data link Send data within the local area network

Physical Specify hardware characteristics and ways to differentiate between ones and zeros Key TCP functions Establish connections Check for errors Reorder packets ACBABC

Slow transmission Which program (port)? (Transmission control protocol) ftp, web, send email, read email, iTunes, Which destination program (port)? Program 1

11101 TCP Program 2 Program n Key UDP functions Establish connections Which application

(port)? (Transmission control protocol) ftp, web, send email, read email, iTunes, UDP sounds lame Web clients and servers use TCP. File transfer clients and servers use TCP. But Streaming video clients and servers use UDP. Internet telephony clients and servers use UDP.

Why? Isochronous applications Summary ACBABC ftp, web, send email, read email, iTunes, Self study questions 1.

2. 3. 4. 5. 6. 7. 8. We mentioned five key functions of TCP what were they? UDP only performs two of those functions, which ones? What is the purpose of the port number in TCP header? Would UDP also use port numbers? Explain your answer. What is the purpose of the IP address in a TCP header?

Would UDP also use IP addresses? Explain your answer. Would a video conferencing application use UDP or TCP for transport? Explain your answer. We say that TCP makes connections. Making a connection is just two computers exchanging IP addresses and agreeing on which port numbers to use during their conversation. Explain that statement.

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