Advantages and disadvantages of WAN

Advantages and disadvantages of WANAssumption.The company consist of 4 buildings, peerless as headquarter which lo scoured in Kuala Lumpur, Malaysia and leash as branches which located in Jakarta Ind wholenesssia, Bangkok Thailand and Manila Filipina.The company consists of 4 departments that ar admin staff, IT department, trade department and human resources department, which have total 40 employees in any office.Each department has 10 employees, which mean e precise departments way of life consist of 10 personal figurers.local argona intercommunicate architecture exit be the resembling amid headquarter and branches.Every building Consist of 3 floors, 1st floors for executive staff and human resources staff, 2nd floor for IT department and server room and the 3rd floor for marketing and confluence room.Every department has its make peripherals much(prenominal) as printer, scanner, and Photostat machine. Projector will be in meeting room.Have connection to the Internet a nd connection to each office.Headquarter office has orthogonal backup which located in Malaysia close headquarter office approximately 2 km, its countenance backup for the database.Problem identification.The company does non have earnings yet.The company does not have DBMS (Database Management System).The company does not have backup yet.Security issues.WAN explanation. at that place are louvre sites in the WAN diagram, consist of headquarter office which is located in Kuala Lumpur Malaysia, three branches offices which is located in Thailand Filipina and Indonesia and one external backup which is located nearby headquarter office. The function of external backup is to keep the data as the reliable data.WAN topology.Basically WAN topology is almost similar with the LAN topology consist of point-to-point topology, ring topology and wind topology. thither are several advantages and disadvantages for every topology. The advantages and disadvantages of each topology will be sho wn in table bellow.For this company we suggest to usance star topology beca spend it is more than scalable, provides shorter data paths amidst two sites and easy to wreak new nodes, if someday the company will expand the business by adding new branches in the early(a) country it will easy to add to the existing WAN, the disadvantages of star topology is it has single point of failure at the concentrator routers. To overcome this worry net income administrator tend to add some alternatives links between sites.WAN transmittal system system technology.For WAN technologies we will do comparison between three technologies that are plightd line, frame relay, X.25 and PPP.For WAN technologies we suggest to theatrical role frame relay because it can provide per take shapeance similar with the lease line with significantly less cost over long length. other reason is burn internetworking cost because with frame relay required few port to access other network, increase performa nce with reduce complexness and definitely it is cheaper than leased line. Lower cost over long distance makes frame relay is good for this company because the branches office located crosswise the country.Technology.For WAN technology we suggest to use VPN (virtual secluded network). VPN is alternatives technology to commute the more expensive WAN technology. The advantages of VPN that available online on (http//www.universitydissertations.com/Communications/ use-VPN.php) are, provide well aegis method, less expensive when compare with the WAN technology, reduce setup times, fast network link, simple network topology and productiveness improved due to less constraints when compared with other networking methods. And the disadvantage of VPN is limited security for wireless exploiters.According to the comparison above, we suggest to use star topology to each department. It is because star topology is more robustness, when one link fails wholly that link is affected and not the e ntire networks, and also it is easy to add new devices into the network if someday the company will expand the network. The major(ip) disadvantages of this topology is dependants on the hub or switch, if central hub or switch fails the entire network will be affected, but sometimes this dependency will becomes another advantages of star topology, because it make easy to troubleshoot the errors, if the entire network is not working it will be problems in the hub or switch.And for connecting each floor, we use backbones cable. So overall LAN topology for each office is exploitation tree topology that assents BUS topology and STAR topology. It will combine the advantages of both topologies, which is easy installation, expandable, combine between multipoint and point-to-point.Transmission media.According Michael Palmer and Robert Bruce Sinclair (2003), when choosing the take up medium for LAN or WAN, it is important to consider the capabilities and limitations of each type, including factors such as data transfer speed, use in specific network topologies, distances requirement, cable and cable component cost, additional network equipment that might be required, flexibility and ease of installation, immunity to interference form outside source, and encourage options.For LAN transmission media is utilise UTP and fibre optic. UTP or Unshielded twisted Pair also known as 10BaseT is one of twisted check type. There are several category of UTP, namely, cat3 has a maximum transmission rate16 Mbps, cat4 maximum rate up to 20 Mbps, cat5 has transmission rate 100Mbps, cat5e transmission rate up to 1000Mbps and cat6 has a transmission rate up to1000Mbps. For cat5e and cat6 is support for using gigabyte Ethernet. For UTP cable in this LAN we use cat5e and cat6. Cat5e is using to connect workstations and peripherals to the switch and switch to the backbones in each departments room. The reason wherefore we select the UTP cat5e because it has high-speed networking ca pabilities of up to 1000 Mbps. Another UTP that we use is cat 6 to connect between backbones cable and server. This cable can contract twice the bandwidth of cat5 and has less crosstalk than cat5e. Whereas for backbone cables we suggest for using fiber optic, no doubt about it that now a days fiber optic is the best cable. Why we suggest using fiber optic, it is because highest bandwidth than other cable, resistance to electromagnetic interference and Radio frequency interference, secure transmission and early detection of cable damage. The main disadvantage of this cable is very high cost.LAN communications protocol.We use transmission control protocol/IP (Transmission Control protocol/Internet protocol) for protocol. The reason why we use TCP/IP because gibe Michael Palmer and Robert Bruce Sinclair (2003), it has many advantages includesIt is used on most networks and Internet, which makes it the international language of translation.There is a wide range of network device desi gned congruous with TCP/IP.Most computer operating system now uses TCP/IP as their main protocol.There is a larger automobile trunk of network professionals who understand TCP/IP.There are several protocol and finishing of the TCP/IP suite. In our network we only use industry that we need such as FTP, DNS, STMP, Telnet, HTTP.FTP (File Transfer Protocol)There is three transfer protocol that support with TCP/IP FTP, TFTP and NFS. For our network we use FTP because it is the file transfer protocol options preferred by Internet exploiters. FTP is an application that enables to transfer data from one removed device to another, its very useful application in our network because the user in branches office can log in into the headquarter office and transfer one or more data files, the user have an let user ID and password on the boniface.DNS (Domain name system)DNS is used to converts a computer or domain name to an IP address or that converts form IP address to a computer or doma in name.STMP (Simple send out Transfer Protocol)STMP is used for sending email. SMTP can only send text files, so files in other format must be converted into text files before sending through STMP. By using this application the staff can send and receive the email.Telnet (telecommunication network)Telnet is used to communicate with host computer usually mainframes minicomputer and to ensure that all network devices connect properly.HTTP (Hyper school text Transfer Protocol)HTTP is used World Wide Web communication. Using this application protocol the staffs can use internet properly in their workstations.Security. procurator server.Proxy servers are devices that operate as intermediary agents on behalf of clients that are on a private or pay offd network. Clients on the protected network send connection requests to the application representative in allege to transfer data to the unprotected network or the Internet. Consequently, the application delegate sends the request on b ehalf of the internal client. (Jazeb Frahim and Omar Santos, 2005).According to Michael Dance in (http//www.ehow.com/facts_5016663_functions- legate-server.html) the functions of proxy server are, caching proxy server will save frequently accessed resources to save the bandwidth and faster loading, content filtering it will filter the accessed web, by blocking reliable web, security when accessing the website proxy servers send Internet requests through a proxy before reach website destination. The proxy will encrypt the information, such as a password, before passing it onto the website.DMZ (Demilitarized zone)Basically DMZ is consort between public server and the LAN to allow external user to access into public server without access the internal server. Benefit of using DMZ is, by separating the public server with the private servers if someone hacks into one of public server does not mean that he can hacks into the private servers and also does not afford any easy route to the LAN.multimedia devices.