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.
- Which of the following statements is/are true? P : An XML document with correct syntax as specified by W3C is called "Well Formed". Q : An XML documented validated against a DTD is both "Well formed" and "Valid". R : <x…
- A fully connected network topology is a topology in which there is a direct link between all pairs of nodes. Given a fully connected n network with nodes, the number of direct links n as a function of can be expressed as
- What is the name of the protocol that allows a client to send a broadcast message with its MAC address and receive an IP address in reply?
- You are designing a link layer protocol for a link with a bandwidth of 1 Gbps (109bits/second) over a fiber link with a length of 800 km. Assume the speed of light in this medium is 200000 km/second. What is the propaga…
- You need 500 subnets, each with about 100 usable host addresses per subnet. What network mask will you assign using a class B network address?
- Consider the following two statements with respect to IPv4 in computer networking : P: The loopback (IP) address is a member of the class B network. Q: The loopback (IP) address is used to send a packet from the host to…
- In the TCP/IP model, encryption and decryption are functions of the ____ layer.
- Which of the following statements is/are true with regard to various layers in the Internet stack? P: At the link layer, a packet of transmitted information is called a frame. Q: At the network layer, a packet of transm…
- What percentage % of the IPv4, IP address space do all class C addresses consume?
- The ability to inject packets into the Internet with a false source address is known as
- The RSA encryption algorithm also works in reverse, that is, you can encrypt a message with the private key and decrypt it using the public key. This property is used in
- Match the following Secret Key Algorithms (List I) with the Corresponding Key Lengths (List II) and choose the correct answer from the code given below.
- The four byte IP Address consists of
- Consider ISO-OSI network architecture reference model. Session layer of this model offers dialog control, token management and .________ as services.
- The Third Generation mobile phones are digital and based on
- Which of the following statement/s is/are true? (i) Firewalls can screen traffic going into or out of an organization. (ii) Virtual private networks can simulate an old leased network to provide certain desirable proper…
- A host is connected to a department network which is part of a university network. The university network, in turn, is part of the Internet. The largest network, in which the Ethernet address of the host is unique, is
- An ISP has the CIDR block 245.248.128.0/20. It wants to give half of it to organization A and a quarter to organization B, keeping the rest. Which is a valid allocation to A and B?
- Consider the following two statements : S1 : TCP handles both congestion and flow control S2 : UDP handles congestion but not flow control Which of the following options is correct with respect to the above statements (…
- Identify the correct sequence in which the following packets are transmitted on the network by a host when a browser requests a webpage from a remote server, assuming that the host has just been restarted.
- Everyone in a group of N people wants to communicate secretly with the N − 1 others using a symmetric key system, with no pair's traffic decodable by the others. The number of keys required in the system as a whole is
- A slotted ALOHA network transmits 200-bit frames using a shared channel with a 200 Kbps bandwidth. Find the throughput of the system, if the system (all stations put together) produces 250 frames per second :
- The period of a signal is 100 ms. Its frequency is _________.
- The dotted-decimal notation of the following IPV4 address in binary notation is _________.10000001 00001011 00001011 11101111
- Which of the following statements are true ? (a) Advanced Mobile Phone System (AMPS) is a second generation cellular phone system. (b) IS - 95 is a second generation cellular phone system based on CDMA and DSSS. (c) The…
- Match the following symmetric block ciphers with corresponding block and key sizes :
- Which of the following statements is/are true? (a) Three broad categories of Networks are (i) Circuit Switched Networks (ii) Packet Switched Networks (iii) Message Switched Networks (b) Circuit Switched Network resource…
- In Challenge-Response authentication the claimant ________.
- Decrypt the message “WTAAD” using the Caesar Cipher with key=15.
- To guarantee correction of up to t errors, the minimum Hamming distance d in a block code min must be ________.