UGC NET · PAPER 2
UGC NET Paper 2 Computer Science – Unit 9: Data Communication and Computer Networks PYQ (June 2024 Re-Exam)
Q4. In a token ring network the transmission speed is 10⁷ bps and the propagation speed is 200 m/μs. The 1-bit delay in this network is equivalent to
- 20 m
- 30 m
- 50 m
- 40 m
Q14. Match List I with List II
| List I | List II |
|---|---|
| (A) Representation of bits | (I) Transport layer |
| (B) Physical Address | (II) Physical layer |
| (C) Logical Address | (III) Network layer |
| (D) Segmentation and reassembly | (IV) Data link layer |
- (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
- (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
- (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
- (A)-(I), (B)-(IV), (C)-(III), (D)-(II)
Q17. Consider a CSMA/CD network that transmits data at 100 Mbps over a 1 km cable with no repeater. If the minimum frame size required for this network is 1250 bytes, what is the signal speed (km/sec) in the cable?
- 8000
- 16000
- 12000
- 20000
Q19. Host A (on a TCP/IPv4 network) sends an IP datagram D to host B (also on a TCP/IPv4 network). Assume no error occurred during transmission of D. When D reaches B, which of the following header fields may differ from those of the original datagram D?
(A) TTL
(B) Checksum
(C) Fragment offset
(D) Source IP
(E) Destination IP
Choose the correct answer from the options given below:
(A) TTL
(B) Checksum
(C) Fragment offset
(D) Source IP
(E) Destination IP
Choose the correct answer from the options given below:
- (A) and (B) Only
- (A), (B) and (C) Only
- (A), (B), (C) and (D) Only
- (A), (B), (C) and (E) Only
Q32. Match List I (IP Address) with List II (Class)
| List I | List II |
|---|---|
| (A) 10.20.30.40 | (I) Class E |
| (B) 210.20.30.3 | (II) Class B |
| (C) 180.30.100.10 | (III) Class A |
| (D) 252.5.15.11 | (IV) Class C |
- (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
- (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
- (A)-(I), (B)-(II), (C)-(IV), (D)-(III)
- (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
Q56. Arrange the following steps in proper sequence for the typical process of a DNS query:
(A) Query authoritative DNS server
(B) Query local DNS server
(C) Local DNS server checks cache
(D) Query root DNS server
(E) Query TLD DNS server
Choose the correct answer from the options given below:
(A) Query authoritative DNS server
(B) Query local DNS server
(C) Local DNS server checks cache
(D) Query root DNS server
(E) Query TLD DNS server
Choose the correct answer from the options given below:
- (A), (C), (E), (B), (D)
- (E), (A), (C), (B), (D)
- (A), (B), (C), (D), (E)
- (B), (C), (D), (E), (A)
Q58. A class B network on the Internet has a subnet mask of 255.255.248.0. What is the maximum number of hosts per subnet?
- 1022
- 1023
- 2046
- 2047
Q68. Consider the three-way handshake during TCP connection establishment between hosts A and B. Let S and R be the random 32-bit initial sequence numbers chosen by A and B respectively. A sends a TCP segment with SYN = 1, SEQ = S and ACK bit = 0, and B accepts the connection request. Which of the following represents the information in the TCP header sent by B to A?
- SYN = 1, SEQ = S+1, ACK bit = 0, ACK number = R, FIN = 0
- SYN = 0, SEQ = R, ACK bit = 1, ACK number = S+1, FIN = 0
- SYN = 1, SEQ = R, ACK bit = 1, ACK number = S+1, FIN = 0
- SYN = 1, SEQ = R, ACK bit = 1, ACK number = S, FIN = 0
Q69. Two computers A and B are configured as follows: A has IP address 203.197.2.53 and subnet mask 255.255.128.0; B has IP address 203.197.75.201 and subnet mask 255.255.192.0. Which one of the following statements is true?
- A and B both assume they are on the same network
- B assumes A is on the same network, but A assumes B is on a different network
- A assumes B is on the same network, but B assumes A is on a different network
- A and B both assume they are on different networks
Q80. Consider the following statements:
(A) In IPv4 addressing, a block of addresses can be defined as x.y.z.t/n, in which x.y.z.t defines one of the addresses and /n defines the mask.
(B) The first address in the block can be found by setting the rightmost 32 − n bits to 0s.
(C) Class C addresses are used for multicast communication.
(D) There are five classes in IPv4 addressing.
(E) Supernetting combines several networks into one large network.
Choose the correct answer from the options given below:
(A) In IPv4 addressing, a block of addresses can be defined as x.y.z.t/n, in which x.y.z.t defines one of the addresses and /n defines the mask.
(B) The first address in the block can be found by setting the rightmost 32 − n bits to 0s.
(C) Class C addresses are used for multicast communication.
(D) There are five classes in IPv4 addressing.
(E) Supernetting combines several networks into one large network.
Choose the correct answer from the options given below:
- (A), (B) and (C) Only
- (A), (B), (D) and (E) Only
- (A), (C), (D) and (E) Only
- (C), (D) and (E) Only