Data Communication and Computer Networks – Previous Year Questions
241 questions from past UGC NET Paper 2 – Computer Science papers, each with the correct answer. Open any question for its explanation.
Topic-wise mock tests
- In standard Ethernet with a transmission rate of 10 Mbps, the length of the medium is 2500 m and the frame size is 512 bits. The propagation speed of a signal in the cable is 2 × 10⁸ m/s. The transmission delay and prop…
- How many more routers can the packet travel to?
- What is the protocol of the payload being carried by the packet?
- What is the size of the datagram?
- What is the header size?
- What is the efficiency of this datagram?
- Match List I (line-coding scheme) with List II (average bandwidth)List I List II A. NRZ-L I. B = N/4 B. 2B1Q II. B = N/8 C. 4D-PAM5 III. B = N/3 D. MLT-3 IV. B = N/2
- Which of the following are types of interface in an ATM network? A. User-to-user B. User-to-network C. Network-to-network D. Host-to-network E. User-to-host Choose the correct answer from the options given below:
- An IPv4 packet has arrived with the first few hexadecimal digits shown below. How many hops can this packet travel before being dropped, and to which upper-layer protocol does the data belong? (54000018 00100110 040601……
- Match List I with List IIList I List II A. Channelization protocol I. ALOHA B. Bit-oriented protocol II. TDMA C. Random-access protocol III. Reservation D. Controlled-access protocol IV. HDLC
- What is the total delay (latency) for a frame of 10 million bits sent on a link with 20 routers, each having a queuing time of 2 μs and a processing time of 1 μs? The link is 5000 km long, the speed of light in the link…
- Services provided by the Point-to-Point Protocol (PPP): A. Frame format B. Establishment of the link C. Flow control D. Sequence numbering E. Authentication Choose the correct answer from the options given below:
- What is the order of the following fields in a Frame Relay frame format? A. Flag B. FCS C. Address D. Information Choose the correct answer from the options given below:
- The sequence of fields in an IP datagram header will be: A. Flags B. Options C. Protocol D. Identification E. Service type Choose the correct answer from the options given below:
- IP is responsible for ______ communication while TCP is responsible for ______ communication.
- According to the Nyquist theorem, to reproduce the original analog signal, a necessary condition is that:
- Which protocol is used to acquire the MAC address of a host whose IP address is known?
- In CRC coding, the data word is 111111, the divisor is 1010 and the remainder is 110. Which of the following is the codeword?
- In the Go-Back-N protocol, Sf (first outstanding packet) = 3 and Sn (next packet to send) = 7. After receiving the packet with AckNo = 6, the value of Sn is ______
- What is the minimum Hamming distance in a block code if we want to be able to detect up to S errors?
- A network uses distance-vector routing. Router R has neighbours X, Y and Z at distances 3, 2 and 5. Their vectors report distances to router P of 7, 6 and 5, and to router Q of 4, 6 and 8, respectively. Which statements…
- A router's table has subnets 12.20.164.0/22 → R1, 12.20.170.0/23 → R2, 12.20.168.0/23 → Interface 0, 12.20.166.0/23 → Interface 1 and a default → R3. Which of the following prefixes can collectively be used to correctly…
- Hosts P and Q are connected through router R. The MTU of link P–R is 1500 bytes and of R–Q is 820 bytes. A TCP segment of 1400 bytes is sent from P to Q with IP identification 0x1234; the IP header is 20 bytes and DF is…
- Match List I with List IIList I List II A. Physical Layer I. Transforming the raw bits into frames for transmission B. Data Link Layer II. Control and monitoring of subnet C. Network Layer III. Transmission of raw bits…
- Arrange the following steps of RSA key generation in the correct order: A. Choose an integer e such that 1 < e < λ(n) B. Compute n = p × q C. Find d ≡ e⁻¹ (mod λ(n)) D. Choose two large prime numbers p and q E. Compute…
- Given the Ethernet address 010110100001000101010101000110001010101000001111 in binary, what is the address in hexadecimal notation?
- A computer on a 10 Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 2 Mbps. It is initially filled to capacity with 16 megabits. What is the maximum duration for which the computer ca…
- In standard Ethernet with a transmission rate of 10 Mbps, assume the length of the medium is 2500 m and the size of a frame is 512 bytes. The propagation speed of a signal in the cable is 2 × 108 m/s. Calculate the tran…
- In CRC coding, if the data word is 111111, the divisor is 1010 and the remainder is 110, which of the following codewords is true?
- Hosts P and Q are connected through a router R. The MTU of link P–R is 1500 bytes and of link R–Q is 820 bytes. A TCP segment of 1400 bytes is sent from P to Q through R with IP identification 0x1234. The IP header is 2…