In a link with R = 1 Gbps packets are received at a rate of 20000 packets/s. If

Question

In a link with R = 1 Gbps packets are received at a rate of 20000 packets/s. If each packet is 12000 bits long, calculate the link utilization (E_t). A router has the routing table shown below. A packet arrives from port 4. Determine the output port (show steps) if the packet destination address is: 100.168.5.44 100.168.7.15 100.168.64.22 A 8000-Byte message must be transmitted over a connectionless network with d = 1500 Bytes and h = 40 Bytes. Packets must pass through 4 hops. Propagation plus processing time is 100 mu s per hop. Bit rate in line is 100 Mbps. Calculate the total time until message is received In order to reduce the total transmission time in (a), should the packet size be increased or reduced? Explain why.

Explanation / Answer

Given,

R = 1 Gbps = 1000Mbps

Each packet size = 12000 Bits

Receiving rate = 20000 Packets / Second

So, receiving rate would be 20000 X 12000 = 240000000 Bits / Second

                                                              = 240 Giga Bits/ Second

Now R = 1 Gbps and the receiving capacity is 240Gpbs

So the utilization factor is 100%

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