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Category > Communications Posted 26 Dec 2017 My Price 10.00

2. Link Layer Performance

2. Link Layer Performance

In the illustrated network, computers can only be located on either one of the two circles, C1or C2. All computers on C1 are connected to hub H1, and all computers on C2 are connectedto hub H2. No computer is located at the intersection of the two circles. The radius of eachcircle is 50 meters, and the maximum rate of all links is 1 Gbps. The propagation speed in themedium is 2×108meters/second.

 

 

(1) Assume that the network uses Slotted Aloha, where the length of each timeslot isequal to the transmission time of a single packet. Each computer generates 500packets per second with each packet being 1000 bytes. What is the throughput ofthe system if there are 10 computers on the network?

(2) In part (1), find the number of nodes in the system if about 30% of the timeslots isidle.

(3) In part (2), what is the expected delay for the successful transmission of eachpacket?

(4) What is the maximum number of nodes that can be supported in the network?

(5) What is the maximum number of nodes supported in the network if the Ethernetprotocol is used?

 

 

4. IP and Routing

(1) In the following figure, fill out the forwarding table at router A. Choose the shortestpath in this problem. The cost is the hop count (note, each network, labelled by cloud, is one hop).

 

Routing table at Router A

Destination Address

Cost

Interface

Next hop IP address

128.4.100.0/24

2

M1

128.5.101.10
       
       
       
       
       
       
       

 

(2) Is it possible to aggregate these addresses to have a smaller routing table? If so, towhat? If not, why not?

 

(3) Now assume that the whole network 128.4.100.0/24 breaks down, and assume thatthe routers are using Routing Information Protocol (RIP) with Poison Reverse. Howmany cycles of routing table updates does it take for A to find out that the network128.4.100.0/24 is unreachable? Show all the steps in the following table. Show eachentry as the pair (next router, cost).

 

iterations

Router A

Router B

Router C

Router D

Before the break

( B , 2 )

( — , 1 )

( D , 2 )

( — , 1 )

1

        

2

        

3

        

4

        

5

        

6

        

7

        

…

        

 

(4) If RIP without Poison Reverse is used, how many cycles does it take for A to learn thatthe network 128.4.100.0/24 is unreachable? Show all the steps in the following table.

iterations

Router A

Router B

Router C

Router D

Before the break

        

1

        

2

        

3

        

4

        

5

        

6

        

7

        

 

 

 

 

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CourseLover
(12)
Status NEW Posted 26 Dec 2017 02:12 PM My Price 10.00

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