Consider the transportation analogy in Section 6.1.1. If the passenger is analog

Question

Consider the transportation analogy in Section 6.1.1. If the passenger is analogous to a datagram, what is analogous to the link layer frame? If all the links in the Internet were to provide reliable delivery service, would the TCP reliable delivery service be redundant? Why or why not? What are some of the possible services that a link-layer protocol can offer to the network layer? Which of these link-layer services have corresponding services in IP? In TCP? Suppose two nodes start to transmit at the same time a packet of length L over a broadcast channel of rate R. Denote the propagation delay between the two nodes as d_prop. Will there be a collision if d_prop

Explanation / Answer

As we know,Transmission delay = L/R and

Propagation delay = d/s

Let us say dprop= n1/n2=1

because both nodes start to transmit at the same time .

Now , Efficiency will be 1/(1+5(1)/dtrans

Here dprop approaches 0 and efficiency approaches 1 and vice versa.

So there will be collision  in the sense that while a node is transmitting it will start to receive a packet from the other node.

The desirable properties of a broadcast medium of rate R bps:

–When only one node has data to send, that node has a throughput of R bps.

–When M nodes have data to send, each node should have R/M average rate

–Decentralized

–Simple and inexpensive to implement

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---