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.
- In Go-back-N protocol, the values of f (Send = 3, S window, the first outstanding packet) n (Send window, the next packet to be send) =7, after receiving the packet with AckNo.6, the S value of n is _____
- Suppose that a corporate website appearance varies according to the department that owns various documents. All the documents need to follow the corporate look and feel. The HR department does not need a separate style…
- Consider a computer network using the distance vector routing algorithm in its network layer. The Objective is to find the shortest cost path from router R to routers P and Q. Assume that R does not initially know the s…
- An organization's routing table has: 12.20.164.0/255.255.252.0 → R1; 12.20.170.0/255.255.254.0 → R2; 12.20.168.0/255.255.254.0 → Interface 0; 12.20.166.0/255.255.254.0 → Interface 1; default → R3. Which prefixes can be…
- Consider two hosts P and Q are connected through a router (R). The maximum transfer unit (MTU) value of the link between (P) and (R) is 1500 bytes and between (R) and (Q) is 820 bytes. A TCP segment of size 1400 bytes i…
- Match List I with List II
- Arrange the following in the correct order which respect to key generation for RSA algorithm. 1 < e < λ A. Choose an integer e such that (n) n = p∗q B. Compute Key length d 1/e C. Find which is equal to p q D. Choose tw…
- Which one of the following allows the session to continue?
- A Computer on a 10Mbps network is regulated Q 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 c…
- Consider two hosts P and Q are connected through a router R. The maximum transfer unit (MTU) value of the link between P and R is 1500 bytes and between R and Q is 820 bytes. A TCP segment of size of 1400 bytes is trans…
- The Solution to Silly Window Syndrome problem is/are: I. Nagle's Algorithm Q II. Clark's Algorithm III. Jacobson's Algorithm IV. Piggy backing Algorithm
- Match List I with List II
- Rearrange the following sequence in the context of OSI Layers: I. Transforming the raw bits in the form of frame for transmission II. Transmission of raw bits over communication channel III. Handling user interfaces IV.…
- A TCP Server application is programmed to listen on port P on Host S. A TCP Client is connected to the TCP Server over the network. Considered that while TCP Connection is active the server is crashed and rebooted. Assu…
- Find first and last addresses of First subnet. q
- Find subnet mask. q
- Find first and last addresses of last subnet. Q
- Using RSA with p = 13, q = 5 and e = 7, the value of d and the cipher value of '6' with key (e, n) are
- The maximum achievable throughput is
- A classless address is given as 167.199.170.82/27. The number of addresses in the network is
- Match List I with List II. List I: (A) DES, (B) AES, (C) 3DES, (D) RSA. List II: (I) Key size 256, (II) Key size 1024, (III) Key size 56, (IV) Key size 168.
- Match List I with List II. List I: (A) BIND, (B) LISTEN, (C) ACCEPT, (D) SOCKET. List II: (I) Block the caller until a connection attempt arrives, (II) Give a local address to a socket, (III) Show willingness to accept…
- Match List I with List II. List I: (A) Physical layer, (B) Data link layer, (C) Network layer, (D) Presentation layer. List II: (I) Routing of signals, dividing outgoing messages into packets, acting as network controll…
- Which of the statements given below is/are correct? It is always important and useful to include an 'alt' attribute on 'img' tag in HTML because A. users who cannot see the image due to vision impairment can have a text…
- Match List I with List II. List I: A. Data link layer, B. Network layer, C. Transport layer, D. Session layer. List II: I. True end-to-end layer, II. Token management, III. Produce billing information, IV. Piggybacking.
- Given below are two statements Statement I: Telnet, Ftp, Http are application layer protocol Statement II: The Iridium project was planned to launch 66 low orbit satellites. In light of the above statements, choose the…
- Which of the following statement is False?
- In Ethernet when Manchester coding is used, the bit rate is__________
- The address of class B host is to be split into 6 bit subnets with ‐ subnet number. What is the maximum number of the subnets and the maximum number of hosts in each subnet?
- In electronic mail, which of the following protocols allows the transfer of multimedia?