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# Computer Networks - Data Communication & Network Security

86:

The number of cross-points needed for 10 lines in a cross-point switch which is full duplex in nature and there are no self connection, is

 A. 100 B. 45 C. 50 D. 90 Answer Report Discuss Option: B Explanation : The number of cross points required for n lines in cross point switch which is full duplex in nature is n*(n-1) / 2 for 10 lines it is (10 * 9)/2 = 45 cross points.  Click on Discuss to view users comments. Write your comments here:
87:

A group of 2m - 1 routers are interconnected in a centralized binary tree. With router at each tree node. Router I communicates with router J by sending a message to the root of the tree. If root then sends the message back down J, the mean path length will be

 A. 2 (m - 2) B. 2 (2m - 1) C. m - 1 D. (2m - 1)/mJ Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. Write your comments here:
88:

A circuit switching network has the following characteristics :

Set up time = 5 sec
Propagation = 5 sec
Message size = 1 M bits
Data transmission rate = 1 M bits
Data transmission rate = 1
Kbps Number of hops = 10

When will the last bit of the message reach the receiver ?

 A. t = 520 sec B. t = 1000 ms C. t = 250 sec D. t = 1025 sec Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Ankit said: (2:57pm on Sunday 19th May 2013) what is the formula of calculation?? Write your comments here:
89:

Two networks each provide reliable connection-oriented service. One of them offers a reliable byte stream and the other offers a reliable message stream. A process writes 1024 bytes, then

 A. both networks will receive 2048 bytes as a single unit B. message stream network will receive 1024 bytes only at one time. But byte stream network will receive 2048 bytes as a single unit. C. message stream network receives 2048 bytes as a whole. But bytes stream 1024 bytes only at a time. D. both will receive 1024 bytes at one time since there is a gap between writes Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Write your comments here:
90:

A packet switching network (highly loaded) has  the following characteristics:

Propagation delay = 2 sec/hp.
Data transmission rate = 1.
Packet size = r bit = 512 bits.
Number of of hops = 10.

At what time the last bit of the last packet will reach the receiver ?

 A. 1024.5 sec B. 1038 sec C. 2048 sec D. 512 sec Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. Ankit said: (2:58pm on Sunday 19th May 2013) Formula?? rajat said: (5:22pm on Friday 25th August 2017) How is this solved explain please?? Write your comments here:

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