UNIT 9 COMPUTER NETWORKS ASSIGNMENT TASKS Assignment 1 AIMS: To know the types of network systems and related standards and

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Oct 26, 2013 (3 years and 10 months ago)

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UNIT 9


COMPUTER
NETWORKS


ASSIGNMENT TASKS


Assignment 1



AIMS:


To know the types of network systems and related standards and
protocols


CRITERIA:


P1



Describe the types of networks available and how they relate to

particular network standards an
d protocols


P2



Describe, using examples, why different network standards and

protocols are necessary


P3




E
xplain the key components required for client workstations to
connect to a network and access network resources


P4

-


E
xplain the function of

interconnection devices


M1



C
ompare the benefits and disadvantages of peer
-
to
-
peer network
and client/server networks




























Task 1: Description of the Types of Networks:


1.

TYPES OF NETWORK


1.

LANs


Local Area Networks



Provide a
definition of a LAN


What are they used for?


How are they structured?


What is a VLAN?


2.

WANs


Wide Area Networks



Provide a definition of a WAN


(The interconnection of various types of LANs)


Provide examples including Janet & the Internet


3.

WAN Technol
ogies



Provide a description of a
Frame Relay


Explain what a packet
-
switched network structure is?


Provide a simple example diagram of a Frame relay

configuration



ATM


Asynchronous Transfer Mode



Provide a definition


What are the differences and a
dvantages over
Frame Relay



MPLS


Multi Protocol Labelled Switching



Provide a brief description


Explain differences to ATM and Frame Relay


4.

VANs


Value Added Networks




Explain the usage of VANs


How are they used by home users and commercial

organ
isations?


5.

MANs


Metropolitan Area Network


PANs


Personal Area Networks



Brief des
criptions of these network types




2.

NETWORK TOPOLOGY

(see Powerpoint)



The structure or layout of the communications network.


Each system has a
physical

and a

logic
al

topology



For each of the following topologies
:

1.

Provide a diagrammatic representation of the layout

2.

Provide a brief description of the layout

3.

List the main advantages and disadvantages of the topology



Topologies:

1.

Bus Topology

2.

Ring Topology

3.

Star Topol
ogy

4.

Mesh Topology

5.

Tree Topology


3.

NETWORK ACCESS METHODS



Describe with the aid of a diagram how devices access the
network to

send data for the following two configurations:


1.

TOKEN RING:



Connection of devices in a logical ring


Data carried by a sof
tware token


Accessing the free token


Sending data to other devices in the ring



What are the advantages and disadvantages of this method.


2.

ETHERNET:



CSMA/CD


Carrier Sense Multiple Access / Collision Detection


CSMA/CA


/ Collision Avoidance



Liste
ning / sensing when channel free to send data


Two devices sending at the same time can cause a collision


Back

off time before resending data




In CA (Wireless systems)


detection of other signals
before


sending


4.

OSI 7 LAYER MODEL

(See Powerpoint &
Handout)



TCP/IP 4 LAYER MODEL
(See Powerpoint & Handout)




5.

FACTORS IN CHOOSING A NETWORK TO MEET BUSINESS

NEEDS


1.

Technical expertise in maintenance

2.

Current available technology

3.

Region / area where network is to be implemented

4.

What technologies are s
upported in that area

5.

Costs

6.

Size required

7.

Speed required

8.

Traffic requirements


usage of the network & number of users


6.

NETWORK PROTOCOLS AND STANDARDS



For effective network communication the system and its devices

require a range of protocols to pro
vide consistency and reliability


Each protocol is used for a different purpose depending on what data is

transmitted



TCP/IP



Transmission Control Protocol / Internet Protocol



Inter
-
communication between LANs and WANs (eg Internet)




Provide a diagr
am to
show the TCP/IP 4 layer model and show

how it is related to the OSI 7 layer model. Show the range of

protocols associated with each of these 4 layers



Provide a brief description of the following protocols



FTP


File Transfer Protocol



HTTP


Hypertext Transfer Protocol



POP 3


Post Office Protocol



SMTP


Simple Mail Transfer Protocol



DNS


Domain name System



TCP


Transmission Control Protocol



UDP


User Datagram Protocol



IP


Internet Protocol



ICMP


Internet Control Messaging P
rotocol



DHCP


Dynamic Host Configuration Protocol



ARP

& RARP



Address Resolution Protocol



What is the App
leT
alk suite of protocols?



The following are known as the
Application Layer Protocols

for using

the Internet or email:


HTTP


FTP


SMTP


DNS


DHCP



6.

LAN STANDARDS



IEEE


Institute of Electrical & Electronic Engineers


To maintain LAN standards for the communication at OSI layer 2



Briefly describe each of the following standards:




IEEE 802.2


Management of Ethernet Data Packets



IEEE

802.3


Definition of MAC Addressing (NIC)



IEEE 802.5


Token Passing Management



Provide a description of
FDDI




FDDI



Fibre Distributed Data Interface


7.

WIRELESS TECHNOLOGIES



T
he following standards for connectionless

systems:




IEEE 802.11


Wireless Standards (WiFi)

Bluetooth



3G / 4G (Mobile Phone Technology)



InfraRed Standards


IrDa





8.

NETWORK DEVICES

(Purpose
-
Features)



Workstations

Computer terminal, Mobile phone,
PDA, Blackberry, Laptop, Television,
Game console, Internet telep
hone




Servers
:


File Servers


Files, Data, Application Software

Web Servers


Web Sites, Data, Communication, E
-
Commerce


Email Servers


Communications


Print Servers


Shared printing


Security Servers


Proxy or Firewall access


Address Servers


DNS

/ DHCP



Network Interface Cards (NICs)


UTP network cards


Wireless adapters


Bluetooth transceivers


Fibre optic cards


External adapters


dongles


PXE


Remote booting






9.

INTERCONNECTION DEVICES (Purpose & Features)



Routers


Switches


Wireless
Access points


(modem)


(hub)


(repeater)


(bridge)


(gateway)


10.

CONNECTORS & CABLING



Leased Lines


Dedicated Lines


Media


UTP / STP, Coaxial, Fibre Optic cabling


Wireless


Microwave


Satellite


Mobile Technology




Cable connection standards


11.

SOFTWARE



Network Operating Systems:


Peer to Peer


Client Server



Virus checking


Firewalls


Email Client




Commercial Systems