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Protocols
Module 2512 – Unit 5.1.5
Definition
• A protocol is a set of rules for the transmission of
data devices. Without them, devices wouldn’t
understand one another and the extent of
computer networks would be severely restricted.
• Protocols involving communication between
computers of different types and platforms can
be broken down into LAN communication
protocols and access protocols.
• LAN protocols refer to network operating
systems. Access protocols determine how an
attached device communicates with the network
transmission medium (often cabling).
Protocols for Modem
Communication
• Sending & receiving computers must use
the same modem protocols and settings if
they can communicate. Also, both modems
must operate at the same speed.
For two devices to communicate the
following needs to be established:-
1.
2.
•
1.
2.
The data transmission rate. The rate is dictated by the
slower of the two.
Whether both devices may transmit to each other
simultaneously, or one direction at a time.
A protocol may also specify:The method by which each device will indicate that it
has finished sending or receiving a message
The method of data flow control. This ensures that
data transmission flows smoothly and the transmitting
device doesn’t send data more quickly than the
receiver can handle.
• Using the internet look up and give a
description of the following protocols:• HTTP
• TCP/IP
• SMTP
• FTP