| 1. |
When collection of various computers seems a single coherent system to its client, then it is called |
| A. | computer network |
| B. | distributed system |
| C. | networking system |
| D. | mail system |
| Answer» B. distributed system | |
| Explanation: a computer network is defined as a collection of interconnected computers which uses a single technology for connection. | |
| 2. |
Two devices are in network if |
| A. | a process in one device is able to exchange information with a process in another device |
| B. | a process is running on both devices |
| C. | pids of the processes running of different devices are same |
| D. | a process is active and another is inactive |
| Answer» A. a process in one device is able to exchange information with a process in another device | |
| Explanation: a computer network, or data network, is a digital telecommunications network which allows nodes to share resources. in computer networks, computing devices exchange data with each other using connections between nodes. the nodes have certain processes which enable them to share a specific type of data using a distinct protocol. | |
| 3. |
Which of the following computer networks is built on the top of another network? |
| A. | prior network |
| B. | chief network |
| C. | prime network |
| D. | overlay network |
| Answer» D. overlay network | |
| Explanation: an overlay network is a computer network that is built on top of another network. some examples of an overlay network are virtual private networks (vpn) and peer-to-peer networks (p2p). | |
| 4. |
In computer network nodes are |
| A. | the computer that originates the data |
| B. | the computer that routes the data |
| C. | the computer that terminates the data |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in a computer network, a node can be anything that is capable of sending data or receiving data or even routing the data to its destination. routers, computers and smartphones are some examples of network nodes. | |
| 5. |
Communication channel is shared by all the machines on the network in |
| A. | broadcast network |
| B. | unicast network |
| C. | multicast network |
| D. | anycast network |
| Answer» A. broadcast network | |
| Explanation: in a broadcast network, information is sent to all stations in a network whereas in a multicast network the data or information is sent to a group of stations in the network. in unicast network, information is sent to only one specific station. the broadcast address of the network is the last assigned address of the network. | |
| 6. |
Bluetooth is an example of |
| A. | personal area network |
| B. | local area network |
| C. | virtual private network |
| D. | wide area network |
| Answer» A. personal area network | |
| Explanation: bluetooth is a wireless technology used to create a wireless personal area network for data transfer up to a distance of 10 meters. it operates on 2.45 ghz frequency band for transmission. | |
| 7. |
A is a device that forwards packets between networks by processing the routing information included in the packet. |
| A. | bridge |
| B. | firewall |
| C. | router |
| D. | hub |
| Answer» C. router | |
| Explanation: a router is a networking device that forwards data packets between computer networks. routers perform the traffic directing functions on the internet. they make use of routing protocols like rip to find the cheapest path to the destination. | |
| 8. |
A list of protocols used by a system, one protocol per layer, is called |
| A. | protocol architecture |
| B. | protocol stack |
| C. | protocol suite |
| D. | protocol system |
| Answer» B. protocol stack | |
| Explanation: a protocol stack refers to a group of protocols that are running concurrently that are employed for the implementation of network protocol suite. each layer in the network model has to use one specific protocol from the protocol stack. | |
| 9. |
Network congestion occurs |
| A. | in case of traffic overloading |
| B. | when a system terminates |
| C. | when connection between two nodes terminates |
| D. | in case of transfer failure |
| Answer» A. in case of traffic overloading | |
| Explanation: network congestion occurs when traffic in the network is more than the network could handle. to avoid network congestion, the network management uses various open-loop and closed-loop congestion control techniques. | |
| 10. |
Which of the following networks extends a private network across public networks? |
| A. | local area network |
| B. | virtual private network |
| C. | enterprise private network |
| D. | storage area network |
| Answer» B. virtual private network | |
| Explanation: a virtual private network extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.vpn provides enhanced security and online anonymity to users on the internet. it is also used to unblock websites which are unavailable in certain regions. | |
| 11. |
Physical or logical arrangement of network is |
| A. | topology |
| B. | routing |
| C. | networking |
| D. | control |
| Answer» A. topology | |
| Explanation: topology in networks is the structure or pattern in which each and every node in the network is connected. there are many topologies in networking like bus, tree, ring, star, mesh, and hybrid topology. there is no particular best topology and a suitable topology can be chosen based on the kind of application of the network . | |
| 12. |
Which network topology requires a central controller or hub? |
| A. | star |
| B. | mesh |
| C. | ring |
| D. | bus |
| Answer» A. star | |
| Explanation: in star topology, no computer is connected to another computer directly but all the computers are connected to a central hub. every message sent from a source computer goes through the hub and the hub then forwards the message only to the intended destination computer. | |
| 13. |
topology requires a multipoint connection. |
| A. | star |
| B. | mesh |
| C. | ring |
| D. | bus |
| Answer» D. bus | |
| Explanation: in bus topology, there is a single cable to which all the network nodes are connected. so whenever a node tries to | |
| 14. |
Data communication system spanning states, countries, or the whole world is |
| A. | lan |
| B. | wan |
| C. | man |
| D. | pan |
| Answer» B. wan | |
| Explanation: wan is the abbreviation for wide area network. this network extends over a large geographical area. wans are used to connect cities, states or even countries. a wireless connection is required to build a wan. the best example of wan is the internet. | |
| 15. |
Data communication system within a building or campus is |
| A. | lan |
| B. | wan |
| C. | man |
| D. | pan |
| Answer» A. lan | |
| Explanation: lan is an abbreviation for local area network. this network interconnects computers in a small area such as schools, offices, residence etc. it is the most versatile kind of data communication system where most of the computer network concepts can be visibly used. | |
| 16. |
WAN stands for |
| A. | world area network |
| B. | wide area network |
| C. | web area network |
| D. | web access network |
| Answer» B. wide area network | |
| Explanation: wan is the abbreviation for wide area network. this network extends | |
| 17. |
In TDM, slots are further divided into |
| A. | seconds |
| B. | frames |
| C. | packets |
| D. | bits |
| Answer» B. frames | |
| Explanation: tdm is the abbreviation for time division multiplexing. it is technique for combining several low rate channels to a single high rate channel. for a certain time slot, the several channels could use the maximum bandwidth. each channel is inactive for a period of time too. some other multiplexing techniques are frequency division multiplexing and phase division multiplexing. | |
| 18. |
is the multiplexing technique that shifts each signal to a different carrier frequency. |
| A. | fdm |
| B. | tdm |
| C. | both fdm & tdm |
| D. | pdm |
| Answer» A. fdm | |
| Explanation: fdm is an abbreviation for frequency division multiplexing. this technique is used when the bandwidth of the channel is greater than the combined bandwidth of all the signals which are to be transmitted. the channel is active at all times unless a collision occurs with another channel trying to use the same frequency. some other multiplexing techniques are time division multiplexing and phase division multiplexing. | |
| 19. |
What is internet? |
| A. | a single network |
| B. | a vast collection of different networks |
| C. | interconnection of local area networks |
| D. | interconnection of wide area networks |
| Answer» B. a vast collection of different networks | |
| Explanation: internet is nothing but an interconnected computer network providing a variety of communication facilities, consisting of a huge amount of small networks using standardized communication protocols. | |
| 20. |
To join the internet, the computer has to be connected to a |
| A. | internet architecture board |
| B. | internet society |
| C. | internet service provider |
| D. | different computer |
| Answer» C. internet service provider | |
| Explanation: the isps (internet service providers) are the main agents through which every computer is connected to the internet. they are licensed to allot public ip addresses to its customers in order to connect them to the internet. | |
| 21. |
Internet access by transmitting digital data over the wires of a local telephone network is provided by |
| A. | leased line |
| B. | digital subscriber line |
| C. | digital signal line |
| D. | digital leased line |
| Answer» B. digital subscriber line | |
| Explanation: dsl (digital subscriber line) is the technology designed to use the existing telephone lines to transport high-bandwidth data to service subscribers. dsl was used to allow the early users access to the internet and it provides dedicated, point-to-point, public network access. | |
| 22. |
3 OVERVIEW OF INTERNET |
| A. | internet exchange point |
| B. | subscriber end point |
| C. | isp end point |
| D. | internet end point |
| Answer» A. internet exchange point | |
| Explanation: isps exchange internet traffic between their networks by using internet exchange points. isps and cdns are connected to each other at these physical locations are they help them provide better service to their customers. | |
| 23. |
Which of the following protocols is used in the internet? |
| A. | http |
| B. | dhcp |
| C. | dns |
| D. | dns, http and dns |
| Answer» D. dns, http and dns | |
| Explanation: http is used to browse all the websites on the world wide web, dhcp is used to allot ips automatically to the users on the internet, and dns is used to connect the users to the host servers on the internet based on the domain name. | |
| 24. |
Internet works on |
| A. | packet switching |
| B. | circuit switching |
| C. | both packet switching and circuit switching |
| D. | data switching |
| Answer» A. packet switching | |
| Explanation: packet switching is the method based on which the internet works. packet switching features delivery of packets of data between devices over a shared network. | |
| 25. |
Which one of the following is not an application layer protocol used in internet? |
| A. | remote procedure call |
| B. | internet relay chat |
| C. | resource reservation protocol |
| D. | local procedure call |
| Answer» C. resource reservation protocol | |
| Explanation: resource reservation protocol is a transport layer protocol used on the internet. it operates over ipv4 and ipv6 and is designed to reserve resources required by the network layer protocols. | |