1. CIS 235: Networks Fall, 2007 Western State College Welcome to CIS 235 Computer Networks Fall, 2007 Prof Peterson

2. CIS 235: Networks Fall, 2007 Western State College The Protocol Stack: Application What sort of applications do we find at the application layer? What protocols run here? What services does this layer need from the one below? What is the data transmitted at this layer called? Where does this layer run?

3. CIS 235: Networks Fall, 2007 Western State College The Transport Layer What protocols run here? What services does this layer need from the one below? What is flow control? What is congestion control? What is the data transmitted at this layer called? Where is this layer implemented?

4. CIS 235: Networks Fall, 2007 Western State College The Network Layer What protocol runs at this layer? What service does this need from the next lower layer? What is the data transmitted called? What is the big thing that happens at the IP level? Where is this implemented?

5. CIS 235: Networks Fall, 2007 Western State College The Link Layer What service does this need from the next lower level? What determines the protocols at this layer? Where does this layer run? What is the data transmitted at this layer called?

6. CIS 235: Networks Fall, 2007 Western State College The Physical Layer What happens at this layer? What sort of concerns do we worry about at this level in the system?