Title: Class Outline 15
Course: KVCC CPT128 > Section: Class Outlines

Chapter 3

1.      The Data Link Layer

a.      What does it do

i.           Interface for the network layer

ii.           Transmission errors

iii.           Flow control

b.      Breaks bits into frames

2.      Network layer interface

a.      Pieces of data are passed from the network layer and then the data link layer transmits them to the destination and then given to the network layer on the other end.

b.      Types of connections

i.           Unacknowledged connectionless service – information is sent there is no acknowledgement from the end

1.      Example - Ethernet

ii.           Acknowledged connectionless service – no connection established but each individual frame is acknowledged so it knows what is sent.

1.      Example - Wireless

iii.           Acknowledged Connection oriented service – A connection is established, each frame numbered and there is verification to their receipt. Each frame is received once and in the same order.

1.      Example – Satellite or long distance telephone

3.      Framing

a.      To transmit data, the network layer has to go over the physical layer. Noise can get in and change the values and due to this data is often broken into chunks called frames.

b.      When dealing with frames you have to establish a method to identify between frames

i.           Byte Count

ii.           Flag Byte with byte stuffing

iii.           Flag bits with bit stuffing

iv.           Physical layer coding violations

4.      Error Control

5.      Flow Control

Attached Files: | - KVCC CPT128_FundNetworkAdmin_Outline 15.pdf