Investigating The Importance Of WAN Technologies Information Technology Essay

Investigating The Importance Of WAN Technologies Information Technology EssayWide argona secretelock is actually important to the global to do their scarper easily now days every companies trying to develop their business all over the world colossal field of view earnings helps them to connect their ne twainrk in concert .the companies need to design the vane according to their needs and purpose beca apply various token of nets be purchasable for unalike purpose. According to this project the company net income placed in contrasting countries each network hold different operation diametric role of architecture ensamples is available to design network single is mates to peer archetype and an other(a) adept is client/ innkeeper simulate most of the network designed by using client/ waiter model. peer to peer model is connect two or much computing contrivances connected through network this model is unsafe because it is difficult to implement security policies .different network topologies ar available to design network so we form to consider these topologies when design a network. Normally every companies using star regional anatomy to design their network because this network topology have more advantage when compargon with other topologies various computing device hardw atomic number 18 comp mavennts need to design a network much(prenominal) as switches, routers, firewalls, waiter, linkectBy using Ethernet technologies and other network technologies several topical anesthetic anaesthetic land network ( topical anesthetic bea network) is created in different countries then each substitutenet LAN was connected together via atmospheric state cloud to make WAN ( encompassing area network)In this project company network model was designed in opnet modeller to investigate the performance of a network looking at WAN technologies with varying traffic loads there are different type of link utilise to implement the traffic load th e network was designed up to getting the final resultLITERATURE surveyComputer networkComputer network is more than one computers or group of computers and network devices are connected together for the purpose sharing nurture, load and selective information between each computer. Different type of devices need to design a computer network much(prenominal) as switches, hubs, routers, different link, firewall, boniface and work station Protocols are use to do sharing information, files, datas over the network there are two transmittance technology available in computer network one is broadcast and another is point to point tie.Computer network classified according to network architecture (peer to peer model, client/ host mode), network topology (star topology, ring topology, bus topology and mesh network topology).computer network it is classified as personal area network (PAN), local area network (LAN),metropolitan area network( homo),wide area network(WAN),global area netwo rk(GAN)Computer network is very useful to the public because it has many applications such(prenominal)(prenominal)(prenominal) as access to remote information by using this application any one stack do their work from anywhere in the world( ticket reservation ,shopping), communication between one to another through email, videoconferencing. Business applicationDifferent type of computer network topical anesthetic area network (LAN)Local area network (LAN) is slight number or group of computers and related devices such as printer, scanner etc that share a common communication line.lan is considered within a small geographical area such as a home, office building here LAN is designed by using Ethernet technology such as Ethernet electrifys, Ethernet switches and adapters.Local area network (LAN) performance features are dep subverting on size of the network, network topologies and transmittal technology. Advantage of LAN is cover small geographical area so transmittal measure i s expressage. Different type of topologies is support to create broadcast LAN network such as bus and ring based topologies. FIDD is apply in the LAN for connect token ring. IEEE 802.11standad indicates the local area network technologies. Andrew sMetropolitan area network (MAN)Metropolitan area network (MAN) is developed reading material of LAN and this network also using same technologies as LAN, equalise with LAN it cover large area (company offices and city).this network go foring voice symptom and dates.MAN network take over few cables it dont have any switching elements, by using network technologies such as backbone technology, routers and switches it connect several LAN networks.DQDB (distri furthered queue dual bus) is MAN network standard by using this standard we can expand the network up to 30km and speeds of 34 to 155 Mbit/sWide area network (WAN)Wide area network (WAN) comparatively covers wide geographical (country or continent) area and connecting number of loc al area network, local area network connected to a WAN through the public net work such as lucre.WAN network can use is orbiter dust, WAN routers contain antenna by using antenna it can make data infection. refillinging device and transmission link are two separate mechanism of subnet in the WAN network. Different type of transmission link are available to carry the signals and data transmission from one system of rules to another system over the WAN network such as twisted straddle cable, coaxial cable and fiber optic cable. WAN is a collection of LAN, these LANs are connected via switching device router so each LAN must contain at least one router to interconnect. WAN network use backbone technology.Global area network (GAN)Global area network (GAN) is collection of different network such as WAN or MAN it covers the very large geographical area (unlimited area). Worldwide individual business companies use GAN network for their process. interlocking architecture modelClient-s erver network modelClient- server model is very useful and popular network model in the network architecture client and server devices are designed for the position function in the computer network client server model of importly employ in internet as well as local area network. Personal computers are client device in the network it is installed with required network software database and files are stored in the server devices, server devices contain more memory, bigger disk drive than client devicesThe client server model client makes a predication to server and server views client pass along and response to their client request. Advantage of client-server model is importantised network model it means all drug users in the network are connected to a central server. Central server contains all user information and communication information. Configuration of data backup, security policies are easy in this modelPeer to peer network modelPeer to peer network is suitable for a s mall network in this model more than one computer or group of computers are connected through the network .peer nodes sharing their documents, audio, video file and datas in digital format a and also they sharing their imagination without a dedicated server all connected peers act as either client or server. One system acts as server for one transaction while simultaneously act as client for another transaction in this model every client act as server and server act as client. It is complicated to apply security policies and access policies to the network because peer to peer network is a small contain few computers. Access permission and rights of users nock individuality in peer to peer network. This model do not utilize centralized network model so it dont have any user information or communication informationNETWORK TOPOLOGIESDifferent network topologies are available in computer networking they are star topology, bus topology, ring topology, tree topology and mesh topology the se topologies help to design an excellent network. when design a network designer should have to choose which topology is suitable for the component particular networkRing topologyRing topology is used to connect network devices in ring contour when these devices in ring shape each device has two neighbour devices for their message transaction this message transaction between neighbour only one direction. Ring topology use token passing system to their message transmission and access control. chief(prenominal) drawback of this method is any device fails in network ring that cause entire network transmission become failure this kind of network can manage and implement easily and it normally uses in office, school network different technologies are available to implement ring topology such as token ring and FDDIStar topology almost of the network use star topology because implementation and maintains of this network is easily this kind of networks use point to point joining betwe en devices and central hub main advantage of star topology is any connection fail between device and hub that affect only particular device. This network devices use twisted span Ethernet cable to connect with central device hubBus topologyBus topology mainly used in LAN networks because these kinds of topology suitable for limited number of device bus topology use backbone to connect all devices together backbone function as connect different part of network and offering path to message transmission between network. Implementation of this topology is easy and inexpensive. It is possible to message transmission in both directions, to bend message bouncing use termination at both end of the bus cable there is no need more cabling to connect devices. Main disadvantage of this topology is if backbone cable fails that affect whole networkTree topologyTree topology combines multiple several star topologies together into a bus by using point to point connection hub devices linked to the tree bus to develop network scalability bus/star topology in a hybrid approach. Implementation of this topology is very difficult, if backbone cable file whole network become failure advantage of this topology is each separate connected by point to point link and it supported by a number of hardware and software vendor.Network components hardware and software components need to create a network there are different type of hardware components available in the network each of them tack together for different function. Usually a network contains many components such as switch, router, server, firewall, hub, work stationest.RouterRouter is one of the important devices in the network it is used to connect more than one network together such as two WANs or two LANs and it allow data transmission between the networks. Routers having routing tables it contain information somewhat network devices that uses to find the destination place of the network. Routers work at transport and network seam of the OSI book of facts model. Routers maintain traffic control in the network.SwitchSwitch is one of the hardware devices in the network it is used to connect network device such as server, workstation and printers together with in a local area network .switches work at the data link form of the OSI speech model. Switches have a facility to check whether that the data received or not, delivering the messages to correct destination and also seting that the particular data was transposered from which device ( pedigree) to other device (destination).different type of Ethernet switches are available but in this network i have used Ethernet 16 port switches to connect network devices.ServerIn the client/server networking model a server receive requests from client in the same network or other network and response client request. There are different types of server with their related configuration. In this network i have used many servers such as database server, Email serve r, VoIP server, HTTP server, FTP server, file server, printer server and backup server.FirewallMain childbed of the firewall is preventing unprivileged user from accessing the network. There is different type of firewalls such as packet filter firewall, application gateway and proxy server each of them doing different line of merchandise in the network .firewall implemented in some hardware devices. In this project i have used firewall router in a simulation.Open system interconnection (OSI) modelOSI reference model is clearly defined how messages runted from source to destination in the networking. OSI reference model contain seven seams such as application layer, presentation layer, session layer, Trans port layer, network layer, data link layer and presentation layer. This model describes structure of a network for applying communications communications communications protocol on seven layers. Every layers doing different function. This model spited into tow part such as upper layers and lower layers. Upper layers associated with software and lower layers associated with hardware. covering layerApplication layer is highest layer of OSI reference model. Main function of this layer is interface for users to relate with application and identifying end user, verify resource availability. By using application users can access information at application layer. Application layer providing some function such as file transfer, electronic mail and software function. Many Protocols are implemented in this layer such as file transfer protocol (FTP), hyper text transfer protocol (HTTP), simple mail transfer protocol (SMTP) and telnet.Presentation layerPresentation layer is sixth layer of the OSI reference model this layer receives all messages from application and sends those messages to session layer. Main function of this layer is converting the format of receiving and sending data format and also many functions are undertaking by this layer such as data co mpression, encryption, decryption, protocol conversation and encodes message for email transaction. Presentation layer providing some services such as simple mail transfer protocol (SMTP), telnet and file transfer protocol (FTP). At this layer data transmission starts with syntax and semantics format.Session layerFifth layer of the OSI reference model is session layer it abides function to communicate between two nodes in the network this layer create, maintain and stop connection between the node and few protocols are implemented they are data link protocol (DLP), apple talk session protocol (ASP) and printer access control protocol (PAP) these protocols are mainly uses to multimedia messages.Transport layerData link layerData link layer is second layer of the OSI reference model the use of this layer is control and arranges all sending messages from software to network link. This layer makes some network setting such as data format setting, time setting and wire setting. it gives many services such as keep all messages are correct format when they transmit, maintain flow control when messages transmit over the link ,detecting error in animal(prenominal) layer and encoding messages for secure transaction.Physical layerPhysical layer is lowest layer of the OSI reference model. This layer receives all messages from data link layer in the format of bits and converts into signal (electrical or electromagnetic signal).messages are sending to physical media via switches and wiresTCP/IP modelTCP/IP model contain four network layers such as application layer, transport layer, internet layer and network inter face layer. TCP/IP model and OSI reference models are providing similar services.TCP/IP model contain network communication protocol used to for different type data transmission between different networks. Simple mail transfer protocol (SMTP), used to Email transaction, file transfer protocol (FTP) used to file transaction etc. This model defines how particular protocols are implemented in a computer for data transmission over the network. End to end connectivity of the TCP/IP model define how datas received, routed and formatted at end nodes.TCP/IP application layerApplication layer is higher level protocol of TCP/IP model this layer match to OSI reference model of session layer, application layer and presentation layer. This layer gives different services to user such as file transfer, email ect. Application layer contain many protocol such as simple mail transfer protocol (SMTP), file transfer protocol (FTP) and telnet. All datas are coded in this layer then these datas encapsulated into transport layer. Lower level layers of TCP/IP model transact by application layer.Transport layerTransport layer is third layer of TCP/IP model. This layer providing services these services are managed by the user datagram protocol (UDP) and transmission control protocol (TCP).TCP is connection oriented and veritable transmission protocol. Connection oriented it means source (sender) set up connection with destination (receiver) node before the sending data. delusion detection, error discipline retransmission of datas is possible in TCP.UDP is connection less and unreliable transmission. Error detection, error correction retransmission of datas is impossible in UDP it is suitable for audio and video transmission. meshing layer cyberspace layer is second layer of TCP/IP model this model used to transfer the message from source computer to destination computer. Internet protocol (IP) is main protocol of this layer. This protocol providing many services such as routing packets between source and destination. Internet protocols receive messages from network interface layer in the format of bit then make it into packets. Network interface layer is lowest layer of the TCP/IP model main function of this layer is by using protocol it create a connection to physical medium, error detection and packet framing are possible in this layer . This layer contain local area network (LAN) and wide area network (WAN) technologies such as token ring,X.25,ehhernet and frame relay. This layer responsible for physical devices such as wire, cables, network interface card and transmit links.Asynchronous transfer mode ( automated teller machine)Asynchronous transfer mode (ATM) contains three layers such as ATM adaption layer, ATM layer and physical layer. This model providing different type of function it used to transfer all type datas such as audio, video and text messages. Same time we can use ATM technology in different network (LAN. MAN and WAN).ATM model contain management, hyphenated and handshaking protocol, quality of services and flow control facilities. Hyphenated protocol is connection oriented cell switched and point to point.ATM use different type of technologies to data transmission. Fixed -length cells model used to transfer variable frames this model use 48 bytes for data, 5bytes for overhead.ATM adaption layerA TM adaption layer is third layer of this model this model composed application layer, transport layer and session layer of OSI reference mode. There are two different types of layers in ATM adaption layer such as convergence sub layer and particleation and reassembly sub layer. It is classified into five types of class for providing different type of services. According to this class of services Convergence sub layer receive messages from high level layer, identify the received message format, type finally arrange all messages for sending out.ATM layerATM layer is second layer of this model this layer providing link between ATM adaption layer and physical layer to transmit cells between those two layers and also create virtual link, doing multiplex and de-multiplex of cells, creating cell header.ATM physical layerATM physical layer is first layer of this model the main function of this layer is encapsulate all incoming cells in a proper format before transmit bit to the physical me dium. Physical layer divided into two sub layers such as transmission convergence sub layer and physical medium dependent sub layer these sub layers are doing different function such as transmission convergence sub layer doing error correction, framing and de-framing of cells and physical medium dependent sub layer assign bit time and coding for the physical medium.ProtocolsProtocol is a set of rules it is used to transfer the message between one ends to another end. OSI reference model is clearly defined how messages transmitted from source to destination in the networking. This reference model contain seven layers each layers must contain one or more protocol for their message transmission.Internet protocol (IP)Main function of internet protocol (IP) is transmits message between one end to another end. When sends the messages via this protocol message divided into many parts each part contain IP address if end system and this small segment send different ways receiver receive this segment in different order. This protocol implemented in network layer of OSI reference model and internet layer of TCP/IP model so internet protocol (IP) support data transmission to upper level layers in OSI and TCP/IP reference model. This protocol is connection less protocol and we cant make sure about delivery of message. Now days two different version of internet protocols (IP) are available in the networking such as internet protocol version4 (IPV4) and internet protocol version6 (IPV6).Transmission control protocol (TCP)Transmission control protocol (TCP) applied in transport layer of OSI reference model and host to host transport layer of TCP/IP model for message transmission. This protocol is a connection oriented and reliable transmission protocol. Connection oriented it means source (sender) set up connection with destination (receiver) node before the sending data. Error detection, error correction retransmission of datas is possible in TCP. Message transmission via th is protocol is very slow because of overhead (20bytes) for error correction/detection and acknowledgement. There are two types of buffers such as sending and receiving buffers these buffers are used to storage, flow control, error detection and correction. Same time messages can be transfer both direction in TCP it provides full duplex transaction and also multiplexing and de-multiplexing are possible in TCP. Behrouz A.User datagram protocol (UDP)User datagram protocol (UDP) installed in transport layer of OSI reference model and host to host transport layer of TCP/IP model for message transmission between the layers. This protocol is a connection less and unreliable transmission protocol. Message transmission via UDP is very fast because there is small header (8bytes).this protocol containing many drawbacks such as no error control and no flow control. Receiver cant identify whether this message is original or duplicate when message transfer via UDP. Encapulation and decapitation o f messages are possible in UDP when messages transfer from source to destination. Behrouz A.Hyper text transfer protocol (HTTP)Main function of hyper text transfer protocol (HTTP) is access data from internet (www).this protocol is applied in application layer of OSI and TCP/IP reference model. It is describe the message transmission over the network from client to server and data format. This protocol use TCP for data transmission between client and server in this model the client first send request to server then server send response message to client. There is no secure message transmission because HTTP does not provide security HTTP provide security when it run over the secure socket layer This protocol messages can only understand by HTTP client and server. Behrouz A. record transfer protocol (FTP)File transfer protocol (FTP) is applied in application layer in TCP/IP model. Main function of this protocol is transferring datas from source to destination (client to server or serv er to client) in easy way.FTP protocol create two link between source and destination one is for message transmission other link for replay.FTP use three controllers such as RETR command function of this command is copying files, STOR command function of this command is store the files and LIST command this is for list the files.FTP use different transmission mode to transfer the files such as compressed mode, stream mode and block mode .through the FTP protocol we can send text files, images and ASCII files.FTP use two different TCP port, port 20 is used transfer datas or files between client and server and port 21 is used to control transmission between them. Behrouz A.Simple mail transfer protocol (SMTP)Simple mail transfer protocol (SMTP) is installed in application layer in TCP/IP reference model. Function of this protocol is transferring the email messages between client and server and also it contains some commands these commands are used to transfer the datas between client and server. Some other protocols are support to email transmission with SMTP such as post office protocol (POP3) and internet mail access protocol (IMAP4) Behrouz A.Simple network management protocol (SNMP)Simple network management protocol (SNMP) is applied in application layer of TCP/IP reference model this type of protocol is used to manage the network for providing better network performance by unfluctuating testing system, protect the network from unwanted user by monitoring system. SNMP protocol defines the transaction between the manager and agent. SNMP manager verify the agent detail by sending requesting message to agent. SNMP identify the packets exchange between manager and agent Behrouz A.Network transmission mediaA transmission media is necessary to transfer a signal form source to destination in the networking system. Signals are transfer via Guided and unguided transmission media now a days different type of guided transmission media support to carry the signal suc h as twisted pair cable, coaxial cable and fiber optic cable. Unguided transmission media it is radio wave, micro wave and infraredTwisted pair cableTwisted pair cable is one of the guided transmission media to carry the signal over the network. Analogy and digital signal can be carried by this cable. This cable contains two shell copper wire then these wires are shed together. This type of cables used in telecommunication system. Twisted pair cable not suitable for long expanse, repeaters is needed to use long distance, for small area it will work without amplification. Compare to other cables this type of cable is inexpensive. Two types of twisted pair cables are available one is unshielded twisted pair cable (UTP) another one is shield twisted pair cable (STP). Andrew sCoaxial cableCompare to twisted pair cable it is better shield cable it is suitable for carry the signal to long distance. This kind of cables used to carry the high frequency signals and broad band signals as we ll as this cable carries analogy and digital signal but using different cable. Coaxial cables providing functions in several ways one is baseband it use total bandwidth to carry the signals, another one is broad band it divide the bandwidth with signals. Centre core it is made by hard copper wire, this core is bounded by inward dielectric insulator, copper screen and plastic sheath. Andrew s, MichaelFiber optics cableFiber optic cables transfer the signal in the form of light beam. This type of cable is used to connect different cities and countries such as telephone connection because these cables are suitable for long distance. Two different types of fibre optic cables are available such as single mode fibber optic cable and multimode fiber optic cable and this cables contain two part such as inner class cylindrical core and outer class cladding Compare with other cables it has many advantage such as it can be used to long distance, signal transmission is very fast and loss of si gnal is very low. Disadvantage of this cable it is very expensive. MichaelQuality of servicesQuality of services (QOS) contains many network technologies to develop a network. Quality of services gives expected result to the network and quality of services develop and forge data transfer, delay, and error rate and loss of cell in the network. It is very use full apply the quality of services to VOIP and video but implementation of quality if services to network is very difficult.Quality of service measureType of DelayDifferent type of delay are occur in the network during the data transmission from one system to another system they are processing delay, queuing delay, transmission delay and propagation delay.Processing delayA data(1 bit) transmission time between the end systems (source to destination) it is called processing delay this delay may occur for the following reaction such as error datas transmitting from one system to router, network architecture, switching mode and als o it include in configuration of network devicesPropagation delayA data (1 bit) of transmission between the source and destination it is called propagation delay. This delay depends on distance between routers and propagation speed it depends on the transmission media propagation delay compute by dividing the distance by propagation speedPropagation delay= Behrouz AQueuing delayDatas or packets waiting in queue at intermediate device (router) for their transaction, when the network is busy router cant rout all the packet at same time it process these packet one by one so packets need to wait this waiting time is called queuing delay.Transmission delayTransmission delay is amount of time is needed to transfer one bit of data via transmission media. Transmission delay depends on bandwidth and size of the data.Transmission time= Behrouz AJitterVoice over internet protocol (VOIP)Voice over internet protocol (VoIP) is used to communication purpose it means one person can transfer his in formation to another person through telephone call, voice and autotype over the IP based network. To reduce the bandwidth waste VOIP use packet- switching method to telephone calls. Normally more bandwidth is needed to voice transmission but voice data is compressed to small for the transaction so it require small bandwidth. Main advantage of VOIP is reducing the cost of long distance calls, when compare with ordinary phone call for this reason every organization applying VOIP in their networks.IP telephone is used in the VOIP network because IP telephone designed with coder/decoder for convert the voice signal from analogy to digital signal and digital to analogy signal. Softwares and hardware components are helps to connect the phone with network. Different protocols are implemented in the VOIP network for support voice transaction such as RTP(real time transport protocol) it support the delay of audio, H.323 protocol used to multimedia transmission, H.235 protocol used to data e ncryption. ) MichaelList of books1) MichaelMICHAEL A, WILLIAM M Networking explained, second editionISBN 1-55558-252-42) Behrouz A.Behrouz A. Frozen, TCP/IP protocol Suite Fourth EditionISBN 978-0-07-016678-33) Andrew sAndrew S.Tanenbaum, computer networks fourth editionISBN 0-13-038488-74) James FJames F.Kurose, Keith W.ROSE Computer networking, fourth edition, a top down approachISBN -13978-0-321-51325-0ISBN -100-321-51325-85) Behrouz ABehrouz A.Forouzan, data communication and networking, fourth editionISBN 007-125442-0List of Internet and