Computer Networks - Computer Networks Section 2

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

  • 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.
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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

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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 ?

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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

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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 ?

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