Computer Awareness Study Material – Data Communication and Networking

Computer Awareness Study Material – Data Communication and Networking

Computer Awareness Study MaterialBanking AwarenessMarketing Aptitude

The term communication means sending or receiving information. When we communicate, we share information or data. A communication system can be defined as the collection of hardware and software that facilitates intersystem exchange of information between different devices.

Data Communication
It is the exchange of data between two devices using some form of transmission media. It includes the transfer of data or information and the method of preservation of data during the transfer process. Data is transferred from one place to another in the form of signals. There are three types of signals

1. Digital Signal In this signal, data is transmitted in electronic form of data, i.e. binary digits (0 or 1).
2. Analog Signal In this signal, data is transmitted in the form of radiowaves like in telephone line.
3. Hybrid Signal These signals have properties of both analog signal and digital signal.

Communication Channel
The communication channel refers to the direction of signal flow between two linked devices.

Types of Communication Channel
There are mainly three types of communication channel

• Simplex Channel In this channel, the flow of data is always in one direction, with no capability to support response in other direction. This communication is unidirectional. Only one of the communicating devices transmits information and the other can only receive it. e.g. Radio, Television, Keyboard, etc.
• Half Duplex Channel In this channel, the data can flow in both directions, but not at a same time. When one device transmits information, then other can only receive at that point of time, e.g. Walkie-Talkie.
• Full Duplex Channel In this channel, the flow of data is in both directions at a time, i.e. both stations can transmit and receive information simultaneously, e.g. Wireless handset (mobile phone).

Communication Media
Communication media of a network refer to the transmission media or the connecting media used in the network. It can be broadly defined as anything that can carry information from a source to destination. It refers to the physical media through which communication signals can be transmitted from one point to another.

Transmission media can be divided into two broad categories
Guided Media or Wired Technologies
The data signal in guided media is bound by the cabling system that guides the data signal along a specific path. It consists of a cable composed of metals like copper, tin or silver.
Basically, they are divided into three categories

• Ethernet Cable or Twisted Pair In this pair, wires are twisted together, which are surrounded by an insulating material and an outer layer called A twisted pair consists of two conductors (copper). One of the wires is used to carry signals to the receiver and the other is used only as a ground reference. It is used as a short distance communication, e.g. Local area networks use twisted pair cable.
• Co-axial Cable It carries the signal of higher frequency data communication through the network. It consists of a solid wire core surrounded by foil shielded or conducting braid or wire mesh, each separated by some insulator. It has a single inner conductor that transmits electric signals and the outer conductor acts as a ground and is wrapped in a sheath of teflon or PVC.
  Co-axial cable is commonly used in transporting multi-channel television signals in cities, e.g. Cable TV network.
  Optical fibres allow transmission over longer distance at higher bandwidth which is not affected by electromagnetic field. The speed of optical fibre is hundred of times faster than co-axial cables.
  
• Fibre Optic Cable It is made up of glass or plastic and transmits signals in the form of light from a source at one end to another. At the source, there are either Light Emitting Diodes (LEDs) or Laser Diodes (LDs), which modulate the data into light beam using frequency modulation techniques.
  

Unguided Media or Wireless Technologies
It is the transfer of information over a distance withput the use of enhanced electrical conductors or wires. When the computers in a network are interconnected and data is transmitted through waves, then they are said to be connected through unguided media.
Some commonly used unguided media of transmission are

1. Radiowave Transmission When two terminals communicate by using radio frequencies then such type of communication is known as radiowave transmission. This transmission is also known as Radio Frequency (RF) transmission. These are omnidirectional. Radiowaves, particularly those waves that propagate in the sky mode, can travel long distances. Each computer attaches to an antenna that can both send and receive radio transmission.
2. Microwave Transmission Microwaves are electromagnetic waves having frequencies range from 0.3 to 300 GHz. Microwaves are Microwaves have a higher frequency than that of radiowaves.
   Microwave is one of the fastest media for data transmission over communication channel. They can be aimed at a single direction instead of broadcasting in all direction. Microwave antenna placed on the top of buildings. It consists series of stations approx 30 miles apart. It is used in cellular network and television broadcasting.
3. Infrared Wave Transmission Infrared waves are the high frequency waves used for short-range communication. These waves do not pass through the solid-objects. They are mainly used in TV remote, wireless speakers.
4. Satellite Communication The communication across longer distances can be provided by combining radio frequency transmission with satellites. It works over a long distance and fast communication. Satellite communication amplifies signal received from one Earth station and again, retransmits to another Earth station, which can be located many thousands of miles away. It is used for communication to ships, vehicles, planes and handheld terminals.

Computer Network
It is a collection of two or more computers, which are connected together to share information and resources. Computer network is a combination of hardware and software that allows communication between computers over a network.

Benefits of Networking
Some of the benefits of network are discussed below

• File Sharing Networking of computer helps the users to share data files.
• Hardware Sharing Users can share devices such as printers, scanners, CD-ROM drives, hard drives, etc.
• Application Sharing Applications can be shared over the network and this allows implementation of client/server applications.
• User Communication This allows users to communicate using E-mail, newsgroups, video conferencing within the network.

Types of Computer Network
Computer network is broadly classified into various types

Local Area Network (LAN)
LAN is a small and single-site network. It connects network devices over a relatively short distance. It is a system in which computers are interconnected and the geographical area such as home, office, buildings, school may be within a building to 1 km. On most LANs, cables are used to connect the computers. LANs are typically owned, controlled and managed by a single person or organisation. They also use certain specific connectivity technologies, primarily Ethernet and Token Ring. LAN provides a sharing of peripherals in an efficient or effective way.

Wide Area Network (WAN)
A WAN is a geographically dispersed collection of LANs. A WAN like the Internet spans most of the world. A network device called a router connects LANs to a WAN.
Like the Internet, most WANs are not owned by any one organisation, but rather exist under collective or distributed ownership and management. WANs use technology like ATM, Frame Relay and X.25 for connectivity.

Metropolitan Area Network (MAN)
It is a data network designed for a town or city. It connects an area larger than a LAN, but smaller than a WAN, such as a city, with dedicated or high performance hardware.
Its main purpose is to share hardware and software resources by the various users. Cable TV network is an example of metropolitan area network. The computers in a MAN are connected using co-axial cables or fibre optic cables.

Personal Area Network (PAN)
PAN refers to a small network of communication. These are used in a few limited range, which is in reachability of individual person. Few examples of PAN are Bluetooth, wireless USB, Z-wave and Zig Bee.                ‘

Virtual Private Network (VPN)
VPN is a technology that is gaining popularity among large organisations that use the global Internet for both intra-and inter-organisation communications, but require privacy in their intra-organisation communication. VPN is a network that is private but virtual.
It is private because it guarantees privacy inside the organisation. It is virtual because it does not use real private WANs; the network is physically public but virtually private.

Network Devices
These devices are required to amplify the signal to restore the original strength of signal and to provide an interface to connect multiple computers in a network. There are many types of network devices used in networking.

Some of them are described below
Repeater
It is a device that operates only on the physical layer of OSI model. Repeaters have two ports and can connect two segments of a LAN. It amplifies the feeble signals when they are transported over a long distance so that the signal can be as strong as the original signal. A repeater boosts the signal back to its correct level.

Hub
It is like a repeater with multiple ports used to connect the network channels. It acts as a centralised connection to several computers with the central node or server. When a hub receives a packet of data at one of its ports from a network channel, it transmits the packet to all of its ports to all other network channel.

Gateway
It is an interconnecting device, which joins two different network protocols together. They are also known as protocol converters. It accepts packet formated for one protocol and converts the formated packet into another protocol.
The gateway is a node in a network which serves as a proxy server and a firewall system and prevents the unauthorised access. It holds the information from a Website temporarily, so that the repeated access to same Website or Web page could be directed to the proxy server instead of actual web server. Thus helps in reducing the traffic load.

Switch
It is a small hardware device that joins multiple computers together within one LAN. Switches work on the data link layer of the OSI model. It helps to reduce overall network traffic.
Switch forwards a data packet to a specific route by establishing a temporary connection between the source and the destination. There is a vast difference between a switch and a hub. A hub forwards each incoming packet (data) to all the hub ports, while a switch forwards each incoming packet to the specified recipient.

Router
It is a hardware device which is designed to take incoming packets, analyse the packets, moving and converting the packets to another network interface, dropping the packets, directing packets to the appropriate locations, etc.

Bridge
It serves a similar function as switches. A bridge filters data traffic at a network boundary. Bridges reduce the amount of traffic on a LAN by dividing it into two segments. Traditional bridges support one network boundary, whereas switches usually offer four or more hardware ports. Switches are sometimes called multiport bridges.

Modem
It is a device that converts digital signal to analog signal (modulator) at the sender’s site and converts back analog signal to digital signal (demodulator) at the receiver’s end, in order to make communication possible via telephone lines. A MODEM is always placed t weeen a telephone line and a computer.

Network Topology
The term ‘topology’ refers to the way a network is laid out, either physically or logically. Topology can be referred as the geometric arrangement of a computer system. Each computer system in a topology is known as node. Network topology is determined only by the configuration of connections between nodes. The most commonly used topology are described below

Bus Topology
It is such that there is a single line to which all nodes are connected. It is usually used when a network installation is small, simple or temporary. In bus topology, all the network components are connected with a same (single) line. Ethernet is commonly well protocol in networks connected by bus topology.
Advantages

1. All the nodes are connected directly, so very short cable length is required.
2. The architecture is very simple and linear.
3. Bus topology can be extended easily on either sides.

Disadvantages

1. In case of any fault in data transmission, fault isolation is very difficult. We have to check the entire network to find the fault.
2. Becomes slow with increase in number of nodes.
3. The entire network shuts down if there is an error occurs in the main cable.

Star Topology
In this network topology, the peripheral nodes are connected to a central node, which rebroadcasts all transmissions received from any peripheral node to all peripheral nodes across the network, including the originating node. A star network can be expanded by placing another star hub.
The protocols used in star topology are Ethernet, Token Ring and Local Talk.
Advantages

1. Installation of star topology is very easy as all the nodes are directly connected to the central node or server.
2. Easy to detect faults and remove it.
3. Failure of single system will not bring down the entire network.

Disadvantages

1. Requires more cable length than bus topology.
2. If hub or server fails, the entire network will be disabled.
3. Difficult to expand, as the new node has to connect all the way to central node.

Ring or Circular Topology
This topology is used in high-performance networks where large bandwidth is necessary.
The protocols used to implement ring topology are Token Ring and Fiber Distributed Data Interface (FDDI). In ring topology, data is transmitted in form of Token over a network. After passing through each node, the data returns to the sending node.
Advantages

1. Short cable length is required.
2. Suitable for optical fibre as the data flow in one direction.
3. It is less costly than star topology.

Disadvantages

1. Fault diagnosis is very difficult in a network formed using ring topology.
2. Failure of single computer affects the whole network.
3. Adding or removing the computers disturbs whole network activity.

Mesh Topology
It is also known as completely interconnected topology. In mesh topology, every node has a dedicated point-to-point link to every other node.
It provides a bi-directional link between each possible node. This type of network topology contains atleast two nodes with two or more paths between them. Mesh topology is robust because the failure of any one computer does not bring down the entire network.
Advantages

1. Excellent for long distance networking.
2. Communication possible through the alternate route, if one path is busy.
3. Its performance is not affected with heavy load of data transmission.

Disadvantages

1. Long wire/cable length, hence increase in the cost of installation and maintenance.
2. The hardware required to connect each link is expensive.

Tree Topology
This is a network topology in which nodes are arranged as a tree. The function of the central node in this topology may be distributed. A tree topology is an extension and variation of star topology. Its basic structure is like an inverted tree, where the root acts as a server. It allows more devices to be attached to a single hub.
Advantages

1. The tree topology simulates hierarchical flow of data. So, it is suitable for applications where hierarchical flow of data and control is required.
2. We can easily extend the network.
3. If one segment is damaged, other segments are not affected.

Disadvantages

1. Long cables are required.
2. There are dependencies on the root node.
3. If the central hub fails, the entire system breaks down.

Models of Computer Networking
There are mainly two models of computer networking

Peer-to-Peer Network
It is also known as P2P network. This computer network relies on computing power at the edges of a connection rather than in the network itself. It is used for sharing content like audio, video, data or anything in digital format. In P2P connection, a couple of computers is connected via a Universal Serial Bus (USB) to transfer files.
In peer-to-peer networking, each or every computer may be worked as server or client.

Client-Server Network
The model of interaction between two application programs in which a program at one end (client) requests a service from a program at the other end (server).
It is a network architecture which separates the client from the server. It is scalable architecture, where one computer works as server and others as client. Here, client acts as the active device and server behaves as passively.

OSI Model
Open System Interconnection (OSI) is a standard reference model for communication between two end users in a network. In 1983, the International Standards Organisation (ISO) published a document called Basic Reference Model for Open System Interconnection, which visualises network protocols as a seven layered model.
OSI is a layered framework for the design of network system that allows communication between all types of computer system. It is mainly consists of seven layers across a network as shown in table.
Seven Layers of OSI Model and their Functions

In OSI model, physical layer is the lowest layer which is implemented on both hardware and software and application layer is the highest layer.

Terms Related to Network

1. Multiplexing It is a technique used for transmitting signals simultaneously over a common medium. It involves single path and multiple channels for data communication.
2. Code Division Multiple Access (CDMA) It is a channel access method used by various radio communication technologies. CDMA employs spread spectrum technology and a special coding scheme, where each transmitter is assigned a code to allow multiple users to be multiplexed over the same physical channel.
3. Packet Switching It refers to method of digital networking communication that combined all transmitted data regardless of content, type or structure into suitable sized blocks, known as packets. Each packet has header information about the source, destination, packet numbering, etc.
4. Public Switched Telephone Network (PSTN) It is designed for telephone, which requires modem for data communication. It is used for FAX machine also.
5. Integrated Services Digital fretwork (ISDN) It is used for voice, video and data services. It uses digital transmission and combines both circuit and packet switching.
6. Ethernet It is a widely used technology employing a bus technology. An ethernet LAN consists of a single co-axial cable called Ether. It operates at 10 Mbps and provides a 48-bits address. Fast ethernet operates at 100 Mbps.

QUESTION BANK

1. To send data/message to and from computers the network software puts the message information in a

1. NIC
2. packet
3. trailer
4. header
5. None of these

2. Geometric arrangement of devices on the network is called

1. topology
2. protocols
3. media
4. LAN
5. None of these

3. LAN can use ………. architecture.

1. peer-to-peer
2. client and server
3. Both ‘1’ and ‘2’
4. Neither ‘1’ nor ‘2’
5. None of these

4. Wi-Fi uses

1. optical fibre
2. phase line
3. radiowaves
4. sound-waves
5. None of these

5. ………. is the transmission of data between two or more computers over communication links.

1. Communication
2. Networking
3. Data communication
4. Data networking
5. Information networking

6. Communication channel having ………… types.

1. 1
2. 2
3. 3
4. 4
5. None of these

7. In simplex channel, flow of data is

1. always in one direction
2. always in both direction
3. in both direction, but one at a time
4. All of the above
5. None of the above

8. A packet filtering firewall operates at which of the following OSI layers?

1. At the application layer
2. At the transport layer
3. At the network layer
4. At the gateway layer
5. Both ‘2’ and ‘3’

9. Which of the following refers to a small, single-site network?

1. PAN
2. DSL
3. RAM
4. USB
5. CPU

10. Which of the following topologies is not of broadcast type?

1. Star
2. Bus
3. Ring
4. All of these
5. None of these

11. ……. allows LAN users to share computer programs and data.

1. Communication server
2. Print server
3. File server
4. All of the above
5. None of the above

12. Ethernet uses

1. bus topology
2. ring topology
3. mesh topology
4. All of these
5. None of these

13. In a ring topology, the computer in possession of the………. can transmit data.

1. packet
2. data
3. access method
4. token
5. None of these

14. Network components are connected to the same cable in the ……….. topology.

1. star
2. ring
3. bus
4. mesh
5. tree

15. Two or more computers connected to each other for sharing information form

1. network
2. router
3. server
4. tunnel
5. pipeline

16. A device operating at the physical layer is called a

1. bridge
2. router
3. repeater
4. All of these
5. None of these

17. A protocol is a set of rules governing a time sequence of events that must take place

1. between peers
2. between an interface
3. between modems
4. across an interface
5. None of these

18. An inter-company network which used to distribute information, documents files and database, is called as

1. LAN
2. Switch
3. WAN
4. MAN
5. None of these

19. Which of the following is not a network device?

1. Router
2. Switch
3. Bus
4. Bridge
5. None of these

20. What is the use of bridge in network?

1. To connect LANs
2. To separate LANs
3. To control network speed
4. All of these
5. None of these

21. The first network that has planted the seeds of Internet was

1. ARPANET
2. NSFnet
3. V-net
4. I-net
5. None of these

22. Networking using fibre optic cable is done as

1. it has high bandwidth
2. it is thin and light
3. it is not affected by electromagnetic
4. All of the above
5. None of the above

23. What is the function of a modem?

1. Encryption and decryption
2. Converts data to voice
3. Converts analog signals to digitals and vice-versa
4. Serve as a hardware anti virus
5. None of the above

24. Which of the following is the fastest communication channel?

1. Radiowave
2. Micro wave
3. Optical fibre
4. All are operating at nearly the same propagation speed
5. None of the above

25. Which of the following is an advantage to using fibre optics data transmission?

1. Resistance to data theft
2. Fast data transmission rate
3. Low noise level
4. All of the above
5. None of the above

26. Encryption and decryption are the functions of

1. transport layer
2. session layer
3. presentai ion layer
4. All of these
5. None of these

27. The……… enables your computer to connect to other computer.

1. Video card
2. Sound card
3. Network Interface Card (NIC)
4. Controller card
5. None of the above

28. Switches work on which OSI layer?

1. Data link layer
2. Physical   layer
3. Transport layer
4. Network layer
5. Application layer

29. A(n) ………. area is a small group of computers and peripherals linked together in a small geographic area.

1. MAN
2. PAN
3. CAN
4. LAN
5. None of these

30. Which of the following is called small single site network?

1. LAN
2. DSL
3. RAM
4. USB
5. None of these

31. Which of the following is used for modulation and demodulation?

1. Modem
2. Protocols
3. Gateway
4. Multiplexer
5. None of these

32. In twisted pair, wires are twisted together, which are surrounded by an insulating material and an outer layer called

1. frame
2. cover
3. disk
4. block
5. jacket

33. These servers store and manage files for network users.

1. Authentication
2. Main
3. Web
4. File
5. None of these

34. Which of the following is the greatest advantage of co-axial cabling?

1. High security
2. Physical dimensions
3. Long distances
4. Easily tapped
5. All of the above

35. Which of the following is not a property of twisted-pair cabling?

1. Twisted-pair cabling is a relatively low- speed transmission
2. The wires can be shielded
3. The wires can be unshielded
4. Twisted-pair cable carries signals as light waves
5. All of the above

36. Servers are those computers which provide resources to other computers connected by [SBI Clerk 2009]

1. network
2. mainframe
3. super computer
4. client
5. None of these

37. What type of resource is most likely to be a shared common resource in a computer network? [Allahabad Bank Clerk 2010]

1. Printers
2. Speakers
3. Floppy disk drives
4. Keyboards
5. None of these

38. Which of the following is considered a broad band communication channel?  [SBI PO 2010]

1. Co-axial cable
2. Fibre optic cable
3. Microwave circuits
4. All of the above
5. None of the above

39. Hub is associated with …………  [SBI Clerk 2011]

1. bus
2. ring
3. star
4. mesh
5. All of these

40. Multiplexing involves………. path and ………….. channel.              [SBI Clerk 2011]

1. one, one
2. one, multiple
3. multiple, one
4. multiple, multiple
5. None of these

41. How many bits are there in the ethernet address?             [SBI Clerk 2011]

1. 64 bits
2. 48 bits
3. 32 bits
4. 16 bits
5. None of these

42. How many layers are in the TCP/IP model?  [SBI Clerk 2011]

1. 4 layers
2. 5 layers
3. 6 layers
4. 7 layers
5. None of these

43. The advantage of LAN is [SBI Clerk 2012]

1. sharing peripherals
2. backing up your data
3. saving all your data
4. accessing the Web
5. automatic printing of data

44. A combination of hardware and software that allows communication and electronic transfer of information between computers is a      [SBI Clerk 2012]

1. network
2. backup system
3. server
4. peripheral
5. modem

45. A device that connects to a network without the use of cables is said to be [IBPS Clerk 2012, RBI Grade B 2012]

1. distributed
2. cabled
3. centralised
4. open source
5. wireless

46. P2P is a ……….. application architecture.[IBPS Clerk 2012]

1. client/server
2. distributed
3. centralised
4. 1-tier
5. None of these

47. Which of the following represents the fastest data transmission speed?  [SBI Clerk 2012]

1. Bandwidth
2. bps
3. gbps
4. kbps
5. mbps

48. In OSI network architecture, the routing is performed by           [IBPS Clerk 2012]

1. network layer
2. data link layer
3. transport layer
4. session layer
5. None of these

49. A processor that collects the transmissions from several communication media and send them over a single line that operates at a higher capacity is called [RBI Grade B 2013]

1. multiplexer
2. bridge
3. hub
4. router
5. None of these

50. Which of the following items is not used in Local Area Networks (LANs)? [SSC CGL 2012]

1. Interface card
2. Cable
3. Computer
4. Modem

51. Which is the name of the network topology in which there are bi-directional links between each possible node? [SSC CGL 2012]

1. Ring
2. Star
3. Tree
4. Mesh

52. An alternate name for the completely interconnected network topology is  [SSC CGL 2012]

1. mesh
2. star
3. tree
4. ring

53. ……….. is the most important/powerful computer in a typical network.  [SBI PO 2013]

1. Desktop
2. Network client
3. Network server
4. Network station
5. Network switch

54. What is the function of a modem?   [RBI Grade B 2012]

1. Encryption and decryption
2. Converts data to voice and vice- versa
3. Converts analog signals to digitals and vice-versa
4. Serve as a hardware anti virus
5. None of the above

55. Networking using fibre optic cable is done as                      [RBI Grade B 2012]

1. it has high band width
2. it is thin and light
3. it is not affected by electro-magnetic interference/power surges etc
4. All of the above
5. None of the above

56. Bandwidth refers to [RBI Grade B 2013]

1. the cost of the cable required to implement a WAN
2. the cost of the cable required to implement a LAN
3. the amount of information a peer-to-peer network can store
4. the amount of information a communications medium can transfer in a given amount of time.
5. None of the above

57. Computer connected to a LAN can …………  [IBPS Clerk 2013]

1. run faster
2. share information and/or share peripheral equipment
3. go online
4. E-mail
5. None of the above

58. A USB communication device that supports duty encryption for scare wireless loss communication for notebook users is called              [IBPS Clerk 2013]

1. wireless switch
2. router
3. wireless hub
4. USB wireless is not work adaptor
5. None of the above

59. Which of the following terms is associated with networks?                 [SBI Clerk 2014]

1. MS-Excel
2. Mouse
3. Word
4. Connectivity
5. Plotter

60. Which of the following cables can transmit data at high speeds?                [IBPS Clerk 2014]

1. Flat cables
2. Co-axial cable
3. Optic fibre cable
4. Twisted pair cable
5. UTP cable

61. The hardware device or software program that sends messages between network is known as a          [IBPS Clerk 2014]

1. bridge
2. backbone
3. router
4. gateway
5. Other than those given as options

62. Name the fourth layer of OSI model  [SBI PO 2014]

1. Application layer
2. Data link layer
3. Transport layer
4. Session layer
5. None of these

63. The ground station in VSAT communication is               [RBI Grade B 2014]

1. HTTP
2. multiplexer
3. hub
4. repeater
5. None of these

64. Ethernet, token ring and token bus are types of [SBI Associates 2012, RBI Grade B 2014]

1. WAN
2. LAN
3. communication channels
4. physical media
5. None of the above

65. Pathways that support communication among the various electronic components on the system board are called [SBI PO 2014]

1. network lines
2. processors
3. logic Paths
4. bus lines
5. gateway

66. A(n)……… is composed of several computers connected together to share resources and data.  [RBI Grade B 2014]

1. Internet
2. Network
3. Backbone
4. Hyperlink
5. Protocol

67. What do we call for the arrangement when two or more computers physically connected by cables to share information or hardware?      [SBI Clerk 2015]

1. URL
2. Network
3. Server
4. Internet
5. Modem

68. What is the name of the derive that links your computer with other computers and information services through telephone lines?           [SBI Clerk 2015]

1. Modem
2. LAN
3. URL
4. WAN
5. Server

69. What do we call a network whose elements may be separated by some distance? It usually involves two or more network and dedicated high speed telephone lines. [SBI Clerk 2015]

1. LAN
2. WAN
3. URL
4. Server
5. World Wide Web

70. Which type of network would use phone lines? [SBI Clerk 2012, IBPS Clerk 2015]

1. WAN
2. LAN
3. WWAN
4. Wireless
5. None of the above

71. There is a network that can connect networks ranging from small location or area to a bigger range including public packet network and large corporate networks. That network’s enterprise allows users to share access to applications, services and other centrally located resources. Its ability for a huge geographical access has transformed networking. Which among the following is that network? [IBPS PO 2016]

1. SAN
2. CAN
3. LAN
4. WAN
5. MAN

ANSWERS