Q. If user A wants to send an encrypted message to user B. The plain text of A is encrypted with the .................

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Q. A ............... can forward or block packets based on the information in the network layer and transport layer header.

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Q. Which of the following addresses is used to deliver a message to the correct application program running on a host?

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Q. In substitution, a character in the plaintext is always changed to the same character in the ciphertext, regardless of its position in the text.

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Q. In classful addressing, the IP address 190.255.254.254 belongs to

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Q. In hierarchical routing with 4800 routers, what region and cluster sizes should be chosen to minimize the size of the routing table for a three layer hierarchy?

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Q. In IPv4 header, the field is needed to allow the destination host to determine which datagram a newly arrived fragment belongs to.

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Q. Using data p=3, q=11, n=pq, d=7  in RSA algorithm find the cipher text of the given plain text SUZANNE

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Q. A data file of 1,00,000 characters contains only the characters g-l, with the frequencies as indicated in table. Using the variable-length code by Huffman codes, the file can be encoded with

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Q. In a fully connected mesh network with n devices, there are ................ physical channels to link all devices.

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Q. The baud rate of a signal is 600 baud/second. If each signal unit carries 6 bits, then the bit rate of a signal is .................

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Q. Match the following:

a. Data link layer                      i. Flow control
b. Network layer                       ii. Node to node delivery
c. Transport layer                     iii. Mail services
d. Application layer                 iv. Routing

Codes:
      a   b    c   d

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Q. An image is 1024∗800 pixels with 3 bytes/pixel. Assume the image is uncompressed. How long does it take to transmit it over a 10-Mbps Ethernet ?

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Q. The .............. measures the relative strengths of two signals or a signal at two different points.

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Q. Which one of the following media is multidrop?

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Q. What is the baud rate of the standard 10 Mbps Ethernet ?

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Q. Binary symmetric channel uses

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Q. Hamming distance between 100101000110 and 110111101101 is

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Q. Given code word 1110001010 is to be transmitted with even parity check bit. The encoded word to be transmitted for this code is

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Q. Networks that use different technologies can be connected by using

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