Data Link Control

1
Data Link Control

• Line Discipline
• Flow Control
• Error Control

2
Figure 10-1
Functions of Data Link Layer
3
Figure 10-2
4
Figure 10-3
5
Figure 10-4
ENQ/ACK
6
Figure 10-5
ENQ/ACK
7
Figure 10-6
Multipoint Discipline
8
Figure 10-7
Select
9
Figure 10-8
Poll
10
Figure 10-9
Flow control set of procedures that tells the
sender how much data it can transmit before it
must wait for an acknowledgement from the receiver
11
Figure 10-10
Stop and Wait
12
Figure 10-11
Sliding Window
13
Figure 10-12
Sender Sliding Window
14
Figure 10-13
Receiver Sliding Window
15
Figure 10-14
Sliding Window Example
16
Figure 10-14-continued
Sender
17
Figure 10-14-continued
Receiver
18
Figure 10-15
19
Figure 10-16
Damaged Frame
20
Figure 10-17
Lost Frame
21
Figure 10-18
Lost ACK
22
Damaged Frame
Figure 10-19
23
Figure 10-20
Lost Frame
24
Figure 10-21
Lost ACK
25
Figure 10-22
Selective Reject
26
Reference

• Data Communications and Networking, 2nd ed.by
  Behrouz A. Forouzan