IGNOU solved assignments BCA 5th sem

Hello I want to know about IGNOU solved assignments BCA 5th sem of Computer Network ( CS-68 ).So can you provide me that ?

Here I am giving you IGNOU solved assignments BCA 5th sem of of Computer Network:

1) (a) What do you understand by the term computer network?
List the key component of a network. (5 Marks)
Ans:
A network is a group of computers and computing devices interlinked each together, so that user can send the data from one computer to another computer. It is a medium to connect the people over the world.

A computer network, often simply referred to as a network, is a collection of hardware
components and computers interconnected by communication channels that allow sharing of resources and information.
Advantage
Data sharing.
Device sharing.
On-line education.
On-demand video.
On-line banking.
News broadcasting.

Key Components are:-
I. Router: - Routers are devices (computer) which contain software that helps to determine
the best path from the existing (available path) path. It is used to connect similar or
dissimilar network (LAN or WAN). A router between two LANs receives message from
both networks, checks their destinations. And transmit the message to required LAN.

II. Gateway: - it is used to connect totally dissimilar network. It performs protocol
conversion for all seven OSI layer. It can recover e-mail message in one format and
convert it into another format. We can connect system with different protocol, Language,
and architecture with gateway.

III. Repeaters: A repeater is an electronic device that receives a signal, cleans it from the
unnecessary noise, regenerates it and retransmits it at a higher power level, or to the other
side of an obstruction, so that the signal can cover longer distances without degradation.
In most twisted pair Ethernet configurations, repeaters are required for cable which runs
longer than 100 meters. Repeaters work on the Physical Layer of the OSI model.

IV. Hubs: A network hub contains multiple ports. When a packet arrives at one port, it is
copied unmodified to all ports of the hub for transmission. The destination address in the
frame is not changed to a broadcast address. It works on the Physical Layer of the OSI
model.

V. Switches: A network switch is a device that forwards and filters OSI layer 2 datagrams (chunk of data communication) between ports (connected cables) based on the MAC addresses in the packets. This is distinct from a hub in that it only forwards the frames to the ports involved in the communication rather than all ports connected. A switch breaks the collision domain but represents itself a broadcast domain. Switches make forwarding decisions of frames on the basis of MAC addresses.

Protocols are:-
ARP (ADDRESS RESULATION PROTOCOL):- it is used to find physical address of
machine, if IP address is known.

RARP (REVERSE ADDRESSRESULATION PROTOCON):- It is used to find the IP
address of machine when physical address is known.

ICMP (INRENET CONT ROL MESSAGE PROTOCOL):- It is responsible for best
effort delivery. In case of massage failure it is used to send a notification to sender.

IP (INTERNET PROTOCOL):[It is used to find destination address where data to be
sent.

SMTP: -It is used to transfer a mail from one network to another network.

FTP (FILE TRANSFER PROTOCOL):- It is used to transfer a file from one computer to
another computer.

DNS (DOMAIN NAME SYSTEM):- It describes the domain of website where sites are
stored in particular domain. For example= .com, .org, .in.

WWW (WORLD WIDE WEB):- it is a world web directly, where web sites are
associated with it.

HTTP (HYPRETEXT TRANSFER PROTOCOL):- It is used to transfer all linked file of
web-site.

TELNET:-It stands for tele network. It is a computer or computing device that is used for
remote login. It accesses the user ID and password and makes connection with server.

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Contact details:
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IGNOU Road, Maidan Garhi, New Delhi, Delhi 110068 ‎
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