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Data Communications

A case study about networking.

Luigi Espina

on 30 September 2012

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Transcript of Data Communications

Computer is widely available in offices and homes Data Communications and requires sharing of data
to perform synchronized functions the advancement in communication needed for this system is provided by data communications facilitating and extending
the power of... But what is
Data Communications? Today... Data Communications to another... used to transport data from one point Data Communications is a system consisting of carriers and related devices computer Network is a system in which computers are connected to share info and resources and these are some networking technologies So, we conducted a case study about improving a network... In this generation, with the fast-evolving technology, internet plays a significant role. The notion of setting up a computer shop into business is to be considered to match up the vast need for internet services. ... thus, the competition in this type of business is steep. Comp Shop #2 (cc) photo by medhead on Flickr Comp Shop#1 So, we conducted a case study to improve the networking of a computer shop to be in line of success. In this case study, the proponents aim to: •To integrate computer technology with sufficient speed for additional

work station management. •To increase the handling capacity of the switch and to provide a

connection that is less-prone to data collision. •To further improve the lay-out or structure design of the cable


•To update the file system security access.

•To modify the fault tolerance requirement for anticipated network


•To provide faster and more reliable file accessibility.

•To provide an increased reliability and file security.

•To upgrade the existing network connection with the Internet. Our subject , Main Street Computer shop, is located at... Purok 1 Ext., San Pedro, Hagonoy, Bulacan alongside the home and sari-sari store of Mr. and Mrs. Escartin the network of the computer shop consists of... 21 PCs including server 2 routers , 1 switch designed in an L-shaped room 15’’ Samsung SyncMaster CX502BM LCD AMD Athlon™ II X2 250 3.0 GHz TP-Link
TL-WR340G 54Mbps Wireless Router Windows 7
32-bit (cc) photo by twicepix on Flickr AMD Athlon™ II X2 250 3.0 GHz WINDOWS 7
32-bit TP-Link
TL-WR340G 54Mbps Wireless Router Epson Stylus™ T13 1 printer 2GB Kingston PC6400 DDR2 1GB 32bit NVIDIA GeForce 9500 GT Hitachi 500GB SATA 7200RPM Hard Disk Drive AMD Athlon™ II X2 250 3.0 GHz WINDOWS 7
32-bit Epson Stylus™ T13 2GB Kingston PC6400 DDR2 1GB 32bit NVIDIA GeForce 9500 GT Hitachi 500GB SATA 7200RPM Hard Disk Drive Generic DVD-R ROM60X The 20 workstations are divided for specific use which is provided by the 2 routers PC#1 to PC#10 serves as internet surfing stations while PC#11 to PC#20 is designated as online gaming stations But how will the network work? ? ? ? ? ? ? To provide proper allocation of IP usage and reliable internet speed... the network is provided by 2 routers accordingly Edimax BR-6428nS - 300Mbps Wireless Broadband Router •Complies with wireless 802.11b/g/n standards

•Wireless speed up to 12 times faster and coverage 5 times further

•Built-in hardware WPS (Wi-Fi Protected Setup) button

•Includes EZmax multi-language setup wizard for Internet connection, wireless settings, and firmware upgrade

•Supports WMM, WEP, WPA, WPA2, DDNS, QoS, IP/MAC filter, DMZ, and virtual server TP-Link TL-WR340G - 54Mbps Wireless Router •Establish a 54Mbps wireless connection, sharing Internet access, downloading file or playing games

•Enhanced Wireless Security with WPA/WPA2 and 64/128/152-bit WEP encryption

•WDS wireless bridge provides seamless bridge to expand wireless network is assigned for internet surfing, downloads, research... (GLOBE WiMAX) assigned for online gaming
(DIGITEL DSL) 24-Port Fast Ethernet Unmanaged Desktop/Rackmount SwitchDES-1024D The D-Link® 24-Port Fast Ethernet Unmanaged Desktop/Rackmount Switch (DES-1024D) combines ease of use with unsurpassed performance, resulting in an exceptional value for any network administrator who wants the best possible solution at the best price. The DES-1024D is a true Plug-and-Play device, featuring Auto Speed Sensing, Auto-negotiation, and Auto MDI/MDI-X Crossover. A switch is a telecommunication device which receives a message from any device connected to it and then transmits the message only to the device for which the message was meant. This makes the switch a more intelligent device than a hub (which receives a message and then transmits it to all the other devices on its network). Every network or device connected to it has their own dedicated connection. All devices are connected to switch (PC ‘s and routers) 2 ISP routers with different IP’s - and will serve as the gateway address What is gate way?
The Gateway is the device used to send network packets when wanting to access another device not located on the same network.
A gateway to another network or in this case, “the Internet”. To equally distribute the two ISP in the network, we must set the gateway addresses of all the workstations. For example... You want 15 PCs to use router #1 by default, so you must configure them as follows:

LAN IP - to .110
Subnet -
Default Gateway - (metric 10), (metric 20) then configure the other 15 PCs to use router #2 by default:

LAN IP - to .120
Subnet -
Default Gateway - (metric 10), (metric 20) The gateway with lower metric settings will be the gateway that the PC will use to connect to the Internet. Although you can just put the alternating DNS of your ISP or other directly on the LAN card of the PC, it is more efficient to properly configure the DNS settings on the routers and let the computers use the cached entries instead. Just imagine if all 30 computers request from the DNS server and that server is outside of the LAN. It will also eat up upstream bandwidth. Hence, just use the setup above for more efficiency, not to mention simplifying your setup if you want to change the DNS entries later on The network uses Star Topology CABLING Ethernet CATEGORY 5 UNSHIELDED TWISTED PAIR Cabling Eight-conductor data cable (CAT 5 UTP) contains 4 pairs of wires in an unshielded plastic sheath. Each pair consists of a solid color wire and a white and color striped wire. Each of the pairs is twisted together. To maintain reliability on Ethernet, you should not untwist them any more than necessary (1/2 inch maximum). Wire thickness for CAT 5 UTP is 22 0r 24 AWG (Wire thickness is measured by gauge and represented by the unit AWG, for American Wire Gauge. The higher the gauge number, the thinner the wire.) CAT 5 UTP is capable of transmitting up to 1,000 Mbps (gigabit) when strictly installed to EIA/TIA 568 specifications (Electronics Industry Association/Telecommunications Industry Association). CAT 5 UTP is rated to 100 MHz. Is it secured? virus virus virus The network uses And we recommend... the topology would be... the network switch to be used... 24-Port Gigabit Desktop/Rackmount Switch TL-SG1024D The TL-SG1024D 24-Port Gigabit switch provides an easy way to make the transition to Gigabit Ethernet. All 24 ports support auto MDI/MDIX, no need to worry about the cable type, simply plug and play. Moreover, with the innovative energy-efficient technology, the TL-SG1024D can save up to 40%* of the power consumption, making it an eco-friendly solution for your business network. Featured with 24 10/100/1000Mbps ports, TL-SG1024D greatly expands your network capacity, enabling instant large files transferring. So, power users in the home, office, workgroup, or creative production environment can now move large, bandwidth-intensive files faster. Transfer graphics, CGI, CAD, or multimedia files across the network instantly. SERVER SETUP Kingston 4GB PC3-10600 DDR3 1333 SODIMM Western Digital 1TB SATA 3.0 Blue Inno3d GT430 2GB DDR3 128bit Asus P8H61-M LX3 H61/DDR3/HDMI HOST SETUP Kingston 2GB PC3-10600 DDR3 1333 SODIMM Western Digital 500GB SATA 3.0 Blue Inno3d GT430 2GB DDR3 128bit ECS G41T-R3 G41/DDR3/A/V/L 18.5" Acer S191HQL/V193 LED Widescreen NETWORK CABLE LAYOUT The purpose of the case study was to implement the most efficient means of improving the existing network of Main Street Computer Shop. Due to the competition of providing faster and more dedicated service to the clients, a well-designed network is the key for winning the business. Technological advancements offer a wide selection of devices for achieving the aim of the study, but the cost proficiency must be always deliberated in par with equipment performance.
The current network architecture of the subject is suitable to support the existing number of its workstations. But because of the shop’s location, situated in a well-populated area, possible expansion impose a way to further increase its market. A suggested brand modification and addition of networking equipment, in this case the switch, will aid the growth of workstations in the network. Performance upgrade in the server computer will ensure its capability to handle these changes. Upgrading the processor, increasing the memory and an appropriate operating system are the few things that must be considered. Furthermore, rearranging the positions of the computers made it easier to employ strategic cable connections to the system leading to lesser cable lengths which are less vulnerable to external noises and interferences.
In the end the proposed network topology consisting of two service providers is equally distributed to the number of workstations. Proper selection of the network devices and computer hardware will maintain the speed of data transmission throughout the network. In conclusion... GROUP 3
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