IT430

IT430 E-Commerce
Assignment No: 01 Fall 2009


Question # 1
At which layer lost packets are traced?
ANS:
Session Layer is the 3rd Layer from sender side and 5th layer from the receiver side of International organization for standard’s (ISO) model. This layer instructs to create communication link between the sending and receiving machine via combination of protocols. The modes of communication are simplex, half-duplex and full-duplex.

v Simplex means communication in one direction only.
v Half-duplex means communication in two directions but one party can send data at a time.
v Full-duplex means communication in two directions while both parties are able to send data at the same time.
It also places special checkpoints on data packets to trace any lost packets.

Question # 2
Write down three benefits of switching to IP Version 6.
ANS:
As the IP version 6 is the latest version then the IP version 4 so, no doubt it will be more improved one then the older version; here are three basic benefits that we can derive by switching to the IP version 6

1) Large address space.
2) Improved security
3) Better routing.
4) New header format
5) Efficient and hierarchical addressing and routing infrastructure
6) Stateless and state-full address configuration
7) Built-in security
8) Better support for quality of service (QoS)

Question # 3
You have four computers and a switch, you want to make a network of these computers using switch, which networking topology you will use?
ANS:
In this case when I have four computers and a switch to make a network using the switch, I’ll go for the STAR TOPOLGY. As I know that the switch is a computer networking device that connects network segments. It commonly refers to a network bridge that processes and routes data at the Data link layer of the OSI model. The switch which process data at the network layer is referred as Multilayer switches how ever it is generally not intelligent such as hub but the small network like 4 computers network can be easily made by using a switch in the star topology.

Diagram:
In this diagram have four computers and a switch