Computer Networks NYUS FCSIT Spring 2008 Igor TRAJKOVSKI, Ph.D. Associate Professor

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Presentation transcript:

Computer Networks NYUS FCSIT Spring 2008 Igor TRAJKOVSKI, Ph.D. Associate Professor

The Data Link Layer Chapter 3

Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control

TCP/IP Model The hybrid reference model to be used in this book.

Functions of the Data Link Layer Provide service interface to the network layer Dealing with transmission errors Regulating data flow Slow receivers not swamped by fast senders

Functions of the Data Link Layer (2) Relationship between packets and frames.

Services Provided to Network Layer (a) Virtual communication. (b) Actual communication.

Services Provided to Network Layer (2) Placement of the data link protocol.

Framing A character stream. (a) Without errors. (b) With one error.

Framing (2) (a) A frame delimited by flag bytes. (b) Four examples of byte sequences before and after stuffing.

Error Detection and Correction Error-Correcting Codes Error-Detecting Codes

Error-Correcting Codes Use of a Hamming code to correct burst errors.

Error-Detecting Codes Calculation of the polynomial code checksum.

A Protocol Using Go Back N Pipelining and error recovery. Effect on an error when (a) Receiver’s window size is 1. (b) Receiver’s window size is large.

The Data Link Layer in the Internet A home personal computer acting as an internet host.

PPP – Point to Point Protocol A simplified phase diagram for bring a line up and down.

PPP – Point to Point Protocol frame types.