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# Electronic Communication Essay

1176 words - 5 pages

Chapter 2 Solutions

Minimum frame size is the same as the maximum round-trip delay on the LAN.
1. Maximum round-trip delay = (2 x max. I-way propagation delay) + repeater delay = (500 x 5 x 2)/200) + 25 (seconds = 50 (seconds
At 10 Mbps, generated bytes = 50 Mbps x 10 (sec = 500 bits ~ 64 bytes, which is the minimum frame size.

2. Maximum round-trip delay is the time it takes a bit to traverse between two farthest end stations. Add to this two traversals of repeater, 1 (s each way.

Max. R-T delay = (400 /2 x 108) + 2 = 4( sec.

Min. number of bits to detect collision = 4 x 10-6 x 109 = 4000 bits.

Minimum bytes is the next higher 2n bytes is 512 bytes.

4. The twelve stations are divided between three subnets, with four stations in each. We need to add one 3-port bridge (in practice, a 4-port bridge), a simple version being one workstation with NICs, each connected to one of three subnets. Ports 5, 10, and 15 for the three LANs, LAN1,LAN2, and LAN3 respectively are connected to the bridge. The fourth port of the bridge is depicted as connected to external network.

Figure for Exercise 4

The traffic in each subnet will be about 1.7 Mbps, i.e., utilization factor of 17%

5. Traffic on the hub I/O of server = 16 x 10 x 0.5 Mbps = 80 Mbps. Hence, use a 100 Mbps half-duplex mode of operation for the server as shown .

Figure for Exercise 5

6. Traffic on the server I/O of the hub = 100x 16 x 0.8
= 128 Mbps
In this case the server is connected to the hub using a full duplex 100 Mbps NIC.
An alternative is to split the hub into two subnets and have two half-duplex 100 Mbps I/O's to the server, each one serving one of the two subnets.

7. (a)

|IP Address |MAC Address |Port Number |
|145.50.50.11 |00-00-ID-00-00-0B |11 |
|145.50.50.12 |00-00-ID-00-00-0C |12 |
|145.50.50.13 |00-00-ID-00-00-0D |13 |
|145.50.60.11 |00-00-ID-00-00-15 |21 |
|145.50.60.22 |00-00-ID-00-00-16 |22 |
|145.50.60.23 |00-00-ID-00-00-17 |23 |

(b)

|IP Address |MAC Address |Port Number |
|145.50.50.11 |00-00-ID-00-00-0B |11 |
|145.50.50.12 |00-00-ID-00-00-0C |12 |
|145.50.50.13 |00-00-ID-00-00-0D |13 |
|145.50.50.23 |00-00-ID-00-00-17 |23 |
|145.50.60.21 |00-00-ID-00-00-15 |21 |
|145.50.60.22 |00-00-ID-00-00-16 |22 |
8.

|IP Address |MAC Address |Port Number |
|130.30.40.1 |00-00-ID-00-00-64 |1 |
145.50.50.1100-00-ID-00-00-0B11
|145.50.50.12 |00-00-ID-00-00-0C |12 ...

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