BCA 4010 COMPUTER NETWORKING

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FALL 2015, ASSIGNMENT

PROGRAM	BCA (REVISED FALL 2012)
SEMESTER	4
SUBJECT CODE & NAME	BCA 4010 COMPUTER NETWORKING
CREDIT	4
BK ID	B0956
MAX.MARKS	60

Q1 What is OSI model? Explain all its layers with diagram.

Answer : The OSI, or Open System Interconnection, model defines a networking framework to implement protocols in seven layers. Control is passed from one layer to the next, starting at the application layer in one station, and proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.

There's really nothing to the OSI model. In fact, it's not even tangible. The OSI model doesn't do any functions in the networking process, It is a conceptual framework so we can better understand complex interactions that are happening. The OSI

Q 2 What is Message switching and Packet switching?

Answer : Message Switching

This technique was somewhere in middle of circuit switching and packet switching. In message switching, the whole message is treated as a data unit and is switching / transferred in its entirety.

A switch working on message switching, first receives the whole message and buffers it until there are resources available to transfer it to the next hop. If the next hop is not having enough resource to accommodate large size message, the

Q3. List the design issues related to Data Link Layer.

Answer : The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.[1] The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the physical layer.

Q4.  Briefly explain Point-to-Point Protocol.

Answer : PPP (Point-to-Point Protocol) is a protocol for communication between two computers using a serial interface, typically a personal computer connected by phone line to a server. For example, your Internet server provider may provide you with a PPP connection so that the provider's server can respond to your requests, pass them on to the Internet, and forward your requested Internet responses back to you. PPP uses the Internet protocol (IP) (and is designed to handle others). It is sometimes considered a member of the TCP/IP suite of protocols. Relative to the Open Systems Interconnection (OSI) reference model, PPP provides layer 2 (data-link layer) service. Essentially, it packages your computer's TCP/IP packets and forwards them to the server where they can actually be put on the Internet.

Q5. Briefly explain five parts of Multipurpose Internet Mail Extensions.

Answer : Multipurpose Internet Mail Extensions (MIME)

Description

·         Multipurpose Internet Mail Extensions (MIME) is an Internet protocol used to send audio, video, programs, graphics and other binary files.

·         MIME specifies how to convert the non-ASCII data into ASCII allowing it to remain compatible with existing email protocols.

·         MIME defines five additional email header fields:  MIME-Version, Content-Description, Content ID, Content-Transfer-Encoding, and Content-Type.

·         The Version field specifies the MIME version and informs the receiver that it is dealing with a MIME message.

Q6.  Distinguish between IPV4 and IPV6 addressing schemes

Answer : With the advent of Internet, there was a flow of information between the computers through Internet Protocol. IP Addresses were assigned to group of organizations/institutions to open up communication channels between computer networks. This kind of allocation was done through IPv4 Protocol. With the growing technology, there were growing demands of more such addresses for which the IPv4 was understated. Now, there has been news all around about IPv6 setup due to the scantiness of IPv4. But then what is it all about?

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