What is Computer Network? A computer network, often simply referred to as a network, is a collection...

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Page 1: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.
Page 2: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

What is Computer Network?A computer network, often simply referred to as a network, is a collection

of computers and devices interconnected by communications channels that facilitate communications among users and allows users to share resources .

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Page 3: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

For what purposes are networks used? Computer networks can be used for a variety of purposes:Facilitating communications: Using a network, people can

communicate efficiently and easily via email, instant messaging, chat rooms, telephone, video telephone calls, and video conferencing.

Sharing hardware: In a networked environment, each computer on a network may access and use hardware resources on the network, such as printing a document on a shared network printer.

Sharing files, data, and information: In a network environment, authorized user may access data and information stored on other computers on the network. The capability of providing access to data and information on shared storage devices is an important feature of many networks.

Sharing software: Users connected to a network may run application programs on remote computers.

Information preservation.Security.

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Page 4: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

What are the types of networks ?

LANWANWLANHANPANGANCampus network ....

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Page 5: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

LAN(Local Area Network): A network that connects computers and devices in a limited geographical area such as home, school, computer laboratory, office building, or

closely positioned group of buildings .

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Page 6: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

WAN (Wide Area Network): Computer network that covers a large geographic area such as a city, country, or spans even intercontinental distances, using a communications channel that combines many types of media such as telephone lines, cables, and air waves.

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Page 7: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

WLAN (Wireless Local Area Network ): Also referred to as LAWN. A type of local-area network that uses high-frequency radio waves rather than wires to communicate

between nodes.

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Page 8: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

HAN (Home Area Network): A home network or home area network (HAN) is a residential local area network (LAN).

Page 9: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

PAN (Personal Area Network): A computer network used for communication among computer and different information technological devices close to one person.

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Page 10: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

GAN (Global Area Network): a network used for supporting mobile communications across an arbitrary number of wireless LANs, satellite coverage areas, etc.

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Page 11: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

Campus Network: A computer network made up of an interconnection of local area networks (LAN's) within a limited geographical area. The networking equipments (switches, routers) and transmission media (optical fiber, copper plant, Cat5 cabling etc.) are almost entirely owned (by the campus tenant / owner: an enterprise,university,government etc. ).

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Page 12: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

STARTER With the help of the diagram, describe the function of the components of a typical network system:

1. A file server 2. A bridge3. A router4. A backbone5. A LAN6. A gateway7. A modem

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Page 13: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

A file server: a main computer that provides a storage area for data files on a network

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Page 14: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

A bridge: a hardware and software combination used to

connect the same type of networks.

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Page 15: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

A router: a special computer that directs communicating messages when several networks are connected together.

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Page 16: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

A backbone: the main transmission path, handling the major data traffic, connecting different LANs together.

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Page 17: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

A gateway: an interface that enables dissimilar networks to communicate such as two LANS based on different topologies or network operating systems.

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Page 18: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

A modem: a device for converting digital signals to analogues signals and vice versa to enable a computer to transmit and receive data using an ordinary telephone line.

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Page 19: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

transmit (v):Word Formation : transmission (n),

transmitter (n)

Definition : to send or convey from one person or place to another

Synonyms : pass

Collocations : transmit to, transmit data/ information

Ex: The data will be automatically transmitted from one part of the system to another.CANKAYA UNIVERSITY - OFFICE OF BASIC AND ELECTIVE COURSES- ENGLISH UNIT

Page 20: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

partition (v):Word Formation : partition (n), partitioner

(n)

Definition : to divide sth into two parts

Ex: The hall was partitioned to contain the noise of the computers

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Page 21: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

interface(n):Definition : The point of interaction or

communication between a computer and any other entity, such as a printer or human operator.

Ex: My computer has a network interface, which allows me to get to other computers.

Ex: The new version of the program comes with a much better user interface(= way of showing information to a user) than the original.CANKAYA UNIVERSITY - OFFICE OF BASIC AND ELECTIVE COURSES- ENGLISH UNIT

Page 22: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

vice versa (adv.) :Definition : with the order reversed; the other

way around(the opposite of what has been said)

Ex: Can we use a computer monitor as TV and vice versa ?

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Page 23: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

component (n):Definition : A part of a mechanical or electrical

complex.

Synonyms : part

Ex: A hard drive, a mouse and a keyboard are some of the components of a computer.

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Page 24: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

WiFi hotspot (n.phr.):Definition: A WiFi hotspot is a site that offers

Internet access over a wireless local area network through the use of a router connected to a link to an Internet service provider.WiFi Hotspots are usually found in coffee shops and restaurants.

Ex: When I have free time to spend alone, I find a cafe with wifi hotspot and I connect to the Internet.

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Page 25: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

interference (n): Word Formation : interfere (v)

Definition : changing, modifying , or disrupting a message as it travels along a channel between a source and a receiver. Typically the term refers to the addition of an unwanted signal to the useful signal.

Ex: Some time ago, the interference problem was more common while using WIFI.CANKAYA UNIVERSITY - OFFICE OF BASIC AND ELECTIVE COURSES- ENGLISH UNIT

Page 26: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

intercept (v.) :Word Formation : interception (n)Definition : to receive a communication or

signal directed elsewhere usually secretly

Collocations : intercept data

Ex: Nowadays there are a lot of hackers who intercept the data of other people from their computers.

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Page 27: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

encrypt (v) :Word Formation : encryption (n)Definition : to convert data or information into

code especially to prevent unauthorized access

Antonym : decryptCollocations :encryption programme

Ex: We should encrypt the message for security reasons.

Ex:Messages encrypted using the public key can be decrypted only by someone with the private key.CANKAYA UNIVERSITY - OFFICE OF BASIC AND ELECTIVE COURSES- ENGLISH UNIT

Page 28: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

READING Read the text and the diagram of wireless network setup.Match the diagram key to the components of the

network.

1. B2. C3. A4. D5. E6. F

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Page 29: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

layer (n):Definition : one of the several levels of

network communication system.

Collocations : network layer

Ex: communication process among computers has a lot of layers such as application layer, presentation layer and session layer.

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Page 30: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

interpret (v.) :Word Formation : interpretation (n)

Definition : to give or provide an explanation of sth.

Collocations : interpret the data

Ex: This programme interprets the data in a langauge that is easily understood.

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Page 31: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

compress (v.) :Word Formation : compression (n.)

Definition : To transform (data) to minimize the space required for storage or transmission

Collocations : compress a file

Ex: . She compressed the file in order to download it efficiently

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Page 32: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

node (n.):Definition : A terminal in a computer

network

Ex: Each node has a different function in the network.

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Page 33: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

half-duplex (adj. phr.) : providing communication in both directions, but only one direction at a time (not simultaneously).

full-duplex (adj.phr.): allowing communication in both directions, and, unlike half-duplex, simultaneously.

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Page 34: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

checksum tests (n. phr.) : a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage.

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Page 35: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

scramble (v.) :Word Formation : scrambled (adj)Definition to change a radio or telephone

signal so that it can only be understood using a special device

Ex: They will scramble the data so that nobody can read it.

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Page 36: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

supervise (v.) :Word Formation : supervision (n) supervisor

(n)

Definition : to direct or watch the operation of something or somebody.

Collocations : carefully supervise, supervise operation

Ex: The children play while two teachers supervise them.CANKAYA UNIVERSITY - OFFICE OF BASIC AND ELECTIVE COURSES- ENGLISH UNIT

Page 37: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

medium (n.) :Definition : A means /agency for storing or

communicating information.

Collocations : medium of communication

Ex: Devices with wireless technology uses radio waves as the medium of transmission.

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Page 38: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

verify (v.) :Word Formation : verification (n)

Definition : to determine and test the truth of something.

Synonyms : justify

Ex: Are you able to verify your account?Ex: These figures are surprisingly high

and they'll have to be verified.

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Page 39: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

network congestion (n.):

Definition : network congestion occurs when a link or node is carrying so much data that its quality of the service gets worse.

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Page 40: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

Specialist Reading- KEY1. a. Segments b. Packets2. To determine if the data was scrambled

during transmission3. Until it receives confirmation from the next

point along the route that the packet has arrived undamaged

4. a. The checksum is calculated and verified for each packet

b. The message may be rerouted to avoid congestion on the network

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Page 41: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

5. a. Presentation Layerb. Transport Layerc. Physical Layerd. Data-link layere. Application layerf. Session layerg. Network layerh. Transport layeri. Data-link layer

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Page 42: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

PART B- Key1 2

a. iiib. ic. ivd. ii

a. Tb. Fc. Td. Te. Ff. Tg. T

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Page 43: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

Page 77Exercise 3:a.Presentation Layerb.Transport Layerc.Network Layerd.Session Layere.Application Layer

C--- bitsG---data link, logsF---packets, securityA---trasport, segmentsH---held, session,

completeD--- layerB--- expanded,

decryptedE---readable

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Page 44: What is Computer Network? A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications.

Course Introduction. What is a Network? A system of lines/channels that are interconnected with each other. What is a Computer Network?

Course Introduction. What is a Network? A system of lines/channels that are interconnected with each other. What is a Computer Network?

Computer Network Sritrusta Sukaridhoto. Computer Network – Sritrusta Sukaridhoto Why Computer Network ??? Stand alone Computer …. FOR WHAT ???

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Introduction Chapter 1 1. What is Computer Network A collection of Autonomous computers interconnected by any media. Two computers are said to be interconnected.

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` Interconnected Network Motifs Control Podocyte ...njms.rutgers.edu/proweb/documents/InterconnectedNetworkMotifs.pdf · SYSTEMS BIOLOGY Interconnected Network Motifs Control Podocyte

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CHAPTER 6 Networks. Size of Computer Networks Home computer network National computer network Global computer network.

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ASHOK GARG MOBILE : 9312249405  · 2015. 6. 8. · An interconnected collection of autonomous computers is called Computer Network. It means two computers are said to be interconnected

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