Question

10. Consider a version of Internet in which each communication link capacity is greater than the sum of the input rates for all end systems in Internet. Is the flow control not necessary in this scenario? Explain.

Answer 1

Internet is a connection of computers which are linked with one another for the exchange of information. From one computer you can have access to another computer through telephone lines that have been linked together through a “network. The Internet provides a very fast and cost effective means of communication and information sharing. It provide wide range of communication.

A Communications Link is the communications channel that connects two or more communicating devices. It is the fundamental idea in the networking and the computers. This link may be an actual physical link or it may be a logical link that uses one or more actual physical links. Some types of communication links are listed below.

• Coaxial cables
• Fiber Optics
• Microwave Transmission
• Pairs
• Satellite Broadcast etc.

Network bandwidth is the capacity of a wired or wireless network communications link to transmit the maximum amount of data from one point to another over a computer network or internet connection in a given amount of time. Usually it is in seconds. The more bandwidth a data connection has, the more data it can send and receive at one time.

In data communications, flow control is the process of managing the rate of data transmission between two nodes to prevent a fast sender from overwhelming a slow receiver. It provides a mechanism for the receiver to control the transmission speed. It is important because it is possible for a sending computer to transmit information at a faster rate than the destination computer can receive and process it.

So if the communication link capacity is greater than the sum of input rates of all end systems in internet, then also the flow control is necessary. This is because flow control is all about making sure we don’t send more packets when the receive buffer is already full, as the receiver wouldn’t be able to handle them and would need to drop these packets. So the sender wait for some sort of an acknowledgement (ACK) before continuing to send more data. So the flow control is necessary. Two types of flow control techniques are,

• Stop-and-wait
• Sliding Window

* If you satisfied with the answer, Please give me a like.