BTEC LEVEL 3 IT UNIT 9 A2

Maheen Hannan 6709 11049




BTEC LEVEL 3 IT UNIT 9: ASSESSMENT 2
Computer network theory.




ST FRANCIS XAVIER COLLEGE




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,Maheen Hannan 6709 11049


Contents
Introduction ............................................................................................................................................ 2
What is the assessment about? .......................................................................................................... 2
The context. ........................................................................................................................................ 2
Task 1 ...................................................................................................................................................... 3
Describe why different network standard and protocols are necessary (P2) .................................... 3
The context. .................................................................................................................................... 3
Importance of different standards and protocols. ......................................................................... 3
Task 2 ...................................................................................................................................................... 8
Describe typical services provided by networks. (P5) ........................................................................ 8
The context. .................................................................................................................................... 8
Network services............................................................................................................................. 8
Task 3 .................................................................................................................................................... 14
Evaluate typical services available from a network operating system directory service (D2) ......... 14
The context. .................................................................................................................................. 14
AD and P2P .................................................................................................................................... 14




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,Maheen Hannan 6709 11049




Introduction

What is the assessment about?
This is an assessment for the Level 3 BTECT IT course Unit 9. This unit is based about computer
networks. Throughout this assessment I will show an understanding of the different types of
network, the associated protocols and standards and the key components required for a network.



The context.
As an SFX IT student you use the college network much of the time and you make use of
many network services provided by the college. You must explain what services are in use
when the following happens.
A student enters an SFX Computer room with the permission of the class teacher. The
computers are turned off on entry. The teacher tells the student to complete the
assignment that he has to hand in by the end of the week.




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, Maheen Hannan 6709 11049


Task 1
Describe why different network standard and protocols are necessary (P2)

The context.
Most Local Area Networks work using the TCP/IP protocol, which is not one single protocol
but a large suite of protocols that are used to provide different jobs and services on a
network.
Importance of different standards and protocols.
TCP/IP, Transmission control protocol/Internet protocol, is a set of communication
protocols used in all networks, they allow users to connect to networks and communicate
within the network. This protocol allows devices in a network to connect to one another.
This means that due to this network protocol, devices on a network are able to
communicate with each other.
This protocol uses rules that are in-cooperated into network protocols and are based on a
set of events and methods that occur when connected to a network. One base for the rules,
is how errors are checked, solved and/or formed. For example, the TCP/IP has protocols that
provide security rules or errors (Error 404, 403, 503 etc...) that show an error when files are
trying to be access without the correct authority. Another base rule for TCP/IP protocols are
indications. For example, how a device will indicate when it has finished sending data or
when it has received data.
As the TCP/IP protocols has many protocol, the fundamental protocols are TCP
(Transmission control protocol) and IP (internet protocol). The TCP protocols allows a
network to be formed, the TCP allows two hosts to connect and form a network. For
example, the TCP is used in the internet whenever two host computers are connected, such
as a file sharing event. Furthermore, the TCP allows data to be sent over from one host to
another through the network in the same order that it was sent, in addition to this, TCP
allows (somewhat) guarantees that the data is sent and will be received in the same order
that it was sent.
In addition to TCP, the other fundamental protocol used in the IP, Internet protocol. The IP
is a protocol used to specify data packet formats across a network. The IP allows data
packets to be sent and received without their having to be any connection between the
hosts connected. It simply receives and sends data packets to the where it is needed.
TCP/IP similarly works like the OSI as they both have certain standards, protocols and layers
that are the same. Where the TCP/IP has only four layers; Application, Transport, Network
and Network Interface, the OSI layer model has seven layers, four of which are different.
The OSI layer consists of the layers, Application, Presentation, Session, Transport, Network,
Data-link and Physical.
In contrast to the two layer models, the Application layer for the TCP/IP is equal/similar to
the Application, Presentation and Session layers of the OSI layer. In addition to this


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