Question 96➡| NTA UGC NET November 2017 Paper-3 Suppose we want to download text documents at the rate of 100 pages per second. Assume that a page consists of an average of 24 lines with 80 characters in each line. What is the required bit rate of the channel?
i ➥ 192 kbps
ii ➥ 512 kbps
iii ➥ 1.248 Mbps
iv ➥ 1.536 Mbps
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Answer: IV
Explanation: bit rate: The number of bits that are conveyed or processed per unit of time.
Given, Download rate = 100 pages per second each page consists = 24 lines per page each line consists = 80 characters per line
Question 100➡| NTA UGC NET November 2017 Paper-3 The address of a class B host is to be split into subnets with a 6 – bit subnet number. What is the maximum number of subnets and maximum number of hosts in each subnet?
Question 101➡| NTA UGC NET November 2017 Paper-3 Which of the following statements are true? (a) The fragmentation fields in the base header section of IPv4 have moved to the fragmentation extension header in IPv6. (b) The authentication extension header is new in IPv6. (c) The record route option is not implemented in IPv6.
Question 102➡| NTA UGC NET November 2017 Paper-3 Which of the following routing technique / techniques is / are used in distributed systems ? (a) Fixed Routing (b) Virtual Routing (c) Dynamic Routing
Q103➡| NTA UGC NET November 2017 Paper-3 Which speed up could be achieved according to Amdahl’s Law for infinite number of processes if 5% of a program is sequential and the remaining part is ideally parallel ?
Q105➡| NTA UGC NET January 2017 Paper-2 The maximum size of the data that the application layer can pass on to the TCP layer below is ______.
i ➥ 216 bytes
ii ➥ 216 bytes + TCP header length
iii ➥ 216 bytes – TCP header length
iv ➥ 215 byte.
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Answer: Any Size (Marks to all ) Explanation: Application Layer – Any size Transport Layer – 65515 byte Network layer – 65535 byte Data link layer – 1500 byte Note: Actually it works on any size, but given options are wrong.
Q107➡| NTA UGC NET January 2017 Paper-2 Distance vector routing algorithm is a dynamic routing algorithm. The routing tables in distance vector routing algorithm are updated______.
i ➥ Automatically
ii ➥ by server
iii ➥ by exchanging information with neighbor nodes
Q109➡| NTA UGC NET January 2017 Paper-2 Which of the following is/are true w.r.t. applications of mobile computing ? (A) Travelling of salesman (B) Location awareness services
Q111➡| NTA UGC NET January 2017 Paper-3 Station A uses 32 byte packets to transmit messages to station B using sliding window protocol. The round trip delay between A and B is 40 milliseconds and the bottleneck bandwidth on the path between A and B is 64 kbps. The optimal window size of A is ________.
Q112➡| NTA UGC NET January 2017 Paper-3 Let G(x) be generator polynomial used for CRC checking. The condition that should be satisfied by G(x) to correct odd numbered error bits, will be:
Q113➡| NTA UGC NET January 2017 Paper-3 In a packet switching network, if the message size is 48 bytes and each packet contains a header of 3 bytes. If 24 packets are required to transmit the message, the packet size is_________.
Q114➡| NTA UGC NET January 2017 Paper-3 In RSA public key cryptosystem suppose n = p ∗ q where p and q are primes. (e, n) and (d, n) are public and private keys respectively. Let M be an integer such that o < M < n and φ(n) = (p – 1)(q – 1). Which of the following equations represent RSA public key cryptosystem ? I. C ≡ Me(mod n) M ≡ (C)d(mod n) II. ed ≡ 1(mod n) III. ed ≡ 1(mod φ (n)) IV. C ≡ Me(mod φ (n)) M ≡ Cd(mod φ (n))
Q115➡| NTA UGC NET January 2017 Paper-3 A node X on a 10 Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 2 Mbps. Token bucket is initially filled with 16 megabits. The maximum duration taken by X to transmit at full rate of 10 Mbps is____secs.
Q117➡| NTA UGC NET July 2016 Paper-2 In a fully-connected mesh network with 10 computers, total______number of cables are required and_____number of ports are required for each device.
Q118➡| NTA UGC NET July 2016 Paper-2 In TCP/IP Reference model, the job of_____layer is to permit hosts to inject packets into any network and travel them independently to the destination.
i ➥ Physical
ii ➥ Transport
iii ➥ Application
iv ➥ Host-to-network
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Answer:(Marks to all ) Explanation: Correct Answer is – Internet layer
Q119➡| NTA UGC NET July 2016 Paper-2 If there are N people in the world and are using secret key encryption/decryption for privacy purpose, then number of secret keys required will be:
Q120➡| NTA UGC NET July 2016 Paper-2 Optical fiber uses reflection to guide light through a channel, in which angle of incidence is __ the critical angle.
Q121➡| NTA UGC NET July 2016 Paper-2 An attacker sits between customer and Banker, and captures the information from the customer and retransmits to the banker by altering the information. This attack is called as __.
Q122➡| NTA UGC NET July 2016 Paper-3 Suppose transmission rate of a channel is 32 kbps. If there are ‘8’ routes from source to destination and each packet p contains 8000 bits. Total end to end delay in sending packet P is_____.
Q123➡| NTA UGC NET July 2016 Paper-3 Consider the following statements : A. High speed Ethernet works on optic fiber. B. A point to point protocol over Ethernet is a network protocol for encapsulating PPP frames inside Ethernet frames. C. High speed Ethernet does not work on optic fiber. D. A point to point protocol over Ethernet is a network protocol for encapsulating Ethernet frames inside PPP frames. Which of the following is correct ?
Q124➡| NTA UGC NET July 2016 Paper-3 In CRC checksum method, assume that given frame for transmission is 1101011011 and the generator polynomial is G(x) = x4 + x + 1. After implementing CRC encoder, the encoded word sent from sender side is________.
Q125➡| NTA UGC NET July 2016 Paper-3 A slotted ALOHA network transmits 200 bits frames using a shared channel with 200 kbps bandwidth. If the system (all stations put together) produces 1000 frames per second, then the throughput of the system is _.
Q126➡| NTA UGC NET July 2016 Paper-3 An analog signal has a bit rate of 8000 bps and a baud rate of 1000. Then analog signal has__________signal elements and carry______data elements in each signal.
Q127➡| NTA UGC NET July 2016 Paper-3 The plain text message BAHI encrypted with RSA algorithm using e = 3, d = 7 and n = 33 and the characters of the message are encoded using the values 00 to 25 for letters A to Z. Suppose character by character encryption was implemented. Then, the Cipher Text message is____________.
i ➥ ABHI
ii ➥ HAQC
iii ➥ IHBA
iv ➥ BHQC
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Answer: (Marks to all ) “BANR” Explanation: Upload Soon
Q130➡| NTA UGC NET August 2016 Paper-3 A network with bandwidth of 10 Mbps can pass only an average of 12,000 frames per minute with each frame carrying an average of 10,000 bits. What is the throughput of this network ?
Q132➡| NTA UGC NET August 2016 Paper-3 Which of the following protocols is used by email server to maintain a central repository that can be accessed from any machine ?
Q133➡| NTA UGC NET August 2016 Paper-3 An attacker sits between the sender and receiver and captures the information and retransmits to the receiver after some time without altering the information. This attack is called as______.
Q134➡| NTA UGC NET August 2016 Paper-3 If link transmits 4000 frames per second and each slot has 8 bits, the transmission rate of circuit of this TDM is _______.
Q135➡| NTA UGC NET August 2016 Paper-3 Given the following statements: (A) Frequency Division Multiplexing(FDM) is a technique that can be applied when the bandwidth of a link is greater than combined bandwidth of signals to be transmitted. (B) Wavelength Division Multiplexing (WDM) is an analog multiplexing Technique to combine optical signals. (C) WDM is a Digital Multiplexing Technique. (D) TDM is a Digital Multiplexing Technique. Which of the following is correct?
Q136➡| NTA UGC NET August 2016 Paper-3 A pure ALOHA Network transmits 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is __.
Q138➡| NTA UGC NET August 2016 Paper-3 Assume that we need to download text documents at the rate of 100 pages per minute. A page is an average of 24 lines with 80 characters in each line and each character requires 8 bits. Then the required bit rate of the channel is______.
i ➥ 1.636 Kbps
ii ➥ 1.636 Mbps
iii ➥ 3.272 Mbps
iv ➥ 3.272 Kbps
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Answer: (Marks to all ) 25.6Kbps Explanation: Upload Soon
Q139➡| NTA UGC NET August 2016 Paper-3 Encrypt the plain text Message “EXTRANET” using Transposition cipher technique with the following key: Using ‘Z’ as bogus character.
Q142➡| NTA UGC NET December 2015 Paper-2 Four channels are multiplexed using TDM. If each channel sends 100 bytes/second and we multiplex 1 byte per channel, then the bit rate for the link is_________.
