Network Communication Protocols

dingdongboomNetworking and Communications

Oct 27, 2013 (3 years and 1 month ago)

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Mr C Johnston

ICT Teacher

www.computechedu.co.uk



G055
-

Lecture 10

Network Protocols

Session Objectives


Understand the meaning and use of common protocol suites
used when networking computers including: TCP/IP, IPX/SPX,
NetBEUI, FTP, HTTP, SMTP

What Is A Protocol?


A protocol is a set of rules governing how computers
communicate,


A example of a protocol in real life is the rules of English


a
sentence must start with a capital letter and end with a
punctuation mark,


In networking a protocol defines: how data should be sent, how
its received and how computers acknowledge receipt of data,


To use a protocol software will need to be installed


these
often come as part of your OS or NIC driver,


All computers within a network must use the same protocol in
order for communication to take place.


Overview of Protocols
1


You need to know about the following protocols:


NetBIOS


Network basic input/output system
-

Written by IBM, extends
BIOS to support communication. Computers on a LAN communicate using either
session (connection between 2 machines) or broadcast to all machines (limited
message size)
.
Uses MAC addresses to identify each NIC on the network,


NetBEUI
-

NetBIOS Extended User Interface


extension of NetBIOS a LAN
protocol that allows data to be spilt into frames which can be sent separately
and reassembled by the receiving computer. Used by Microsoft home
networking for file sharing and printing and is more flexible and quicker than
NetBIOS. Uses MAC addresses to identify each NIC on the network,


IPX/SPX
-

Internet packet exchange/sequenced packet exchange


creates a connection between computers with directly on a LAN or by routing
data from one computer to another till it reaches its destination on a WAN. Used
on Novell Netware Networks and is capable of being used on the internet as is
routable but not universally supported so not really suitable. Uses MAC
addresses to identify each NIC on the network,


Overview of Protocols
2


TCP/IP


Transmission Control / Internet Protocol
-

protocol which is
capable of allowing data to be routed so suitable for both LANs and WANs (can
send data for same destination through different routes so very useful. Works
with different LAN technologies and is not OS dependant and because of this
was chosen as the protocol used on the internet in 1983. TCP deals with how
data will be spilt / sent (data transmission protocol), IP adds addressing
(addressing protocol)


FTP


File Transfer Protocol

-

a standard for moving files between computers
on a WAN. Software used to transfer files between machines and allows files to
be moved between different operating systems,


HTTP


Hypertext Transfer Protocol

-

defines how a web page is requested
(such as by hyperlink), how it is found and how it is displayed. Secure HTTP
(HTTPS) is an extension to the HTTP protocol that allows encryption and
authentication for extra security of transactions over the Internet,

Overview of Protocols
3


SMTP


Simple Mail Transfer Protocol
-

used in sending and receiving e
-
mail. Is limited in its ability to queue messages at the receiving end, so it is
usually used with one of two other protocols, POP3 or IMAP, that let the user
save messages in a server mailbox and download them periodically from the
server. In other words, users typically use a program that uses SMTP for sending
e
-
mail and either POP3 or IMAP for receiving e
-
mail.

TCP
-
IP Model

Transport

Transport

Network

Network

Application

Application

Link

Link

Topic Exercise


Complete the following reading:


A2 Text Book Pages pg 34,35,39


AVCE Unit 08 Book pg51
-
54
-

start @ chapter 3.14,


Make your own postcard revision notes on the different
protocols making sure your clearly describe each including the
protocols features, advantages and disadvantages,


Download and complete this topics past exam paper
questions


complete for next lesson.