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Description of the Network
Structure
Classification
as sub-networks
Fast Ethernet
Network Interface Adapters
The aim of this project is to develop a network consisting of 155 nodes for Minda Huf Ltd. The nodes are located at different blocks and having installed with various operating systems and different access rights including the access to the Internet.
The total number of the nodes in the network is 155.
The complete network is divided into 10 subnetworks according to the location of the systems. All of these 10 sub-networks are located in different buildings. The allocation of nodes in each part is given below.
The locations of 155 nodes are in different buildings classified as 10 sub-networks and are given as follows:
Admin : 20 nodes
MD : 18 nodes
Finance : 10 nodes
Accounts : 17 nodes
Store : 20 nodes
Tool Room : 13 nodes
Purchase : 17 nodes
Engineering : 14 nodes
Bond : 6 nodes
Section : 10 nodes
Elect : 10 nodes
The server machines are loaded with WINDOWS 2000 Advanced Server.
The client machines are loaded with WINDOWS 98 or WINDOWS 2000.
All the systems are desktops and there are no notebooks that need any kind of wireless access to the network.
All the blocks of the network are given the rights to access the Internet. The MD block and the Admin are given the access for full time, but rest of the blocks are given time scheduled access to the Internet, though they will have the access to the Intranet all the time.
The type of connection used to connect to the Internet is a leased line. It is a dedicated connection between our computer network and the computer system of our ISP. We do not need to dial our ISP instead we are permanently connected to our ISP with dedicated telephone line connection. The transmission speed of digital data is selected at 512 kbps.
An ISDN connection of 64 kbps speed capacity is taken as the backup connection type for access to the Internet. ISDN is faster than a conventional phone line, but slower as compared to a leased line, as it is not a dedicated connection, so is selected as backup connection. No extra hardware like ISDN router is needed here because only an extra module in the main router can do the task.
The Network at Minda Huf consists of 155 nodes that are located in different departments for example the engineering dept, finance, hrd dept ,store and inventory, marketing, tool room etc. These buildings are even located at a distance of about 50-100 meter. This makes the use of conventional UTP cables for inter – building linking possible. The cables are chosen because they are convenient to protect after installation and also the strength of these cables is enough to last long and tolerate the environment over ground.
Two different blocks Admin Block and the MD Block are located in the same building. So, they are inter connected via a UTP cable of standard ECAT/568B to ensure the good connectivity along with the cost efficiency.
Keeping the importance of Admin Block in mind, an option for a redundant single UTP CAT cable is kept. No other block is provided with any kind of redundant network structure. This may be due to the cost factor and also the importance of the block contributes to the decision.
There are only four terminations at the Admin Block. In order to connect the rest of the blocks with Admin, they are routed through another blocks in the way. This was efficient in terms of cost as well as maintenance after installation. Yes, the routes are chosen on the basis of the importance of the block and the distance of the block from the Admin Block.
As the connectivity of MD Block and Account Block is critical, they are provided with more than one route to the Admin Block through which they can reach to the gateway and get connected to the Internet. Rest of the blocks are provided with only one route to the Admin Block with direct links provided to the blocks depending on their physical locations.
There is a high probability of extension in the Network with more number of systems coming in different blocks. To make the Network enough flexible and allow the upward scalability, switched having more number of ports have been chosen than the number of ports required as per the current needs. For example, 24 ports are provided for 20 machines in the Admin Block. This also contributes to the reliability of the Network going on, as these extra ports may serve in case of partial failure of the device, like in case, when some port of the switch stops working.
Hardware Resources Required
Fast Ethernet Network Interface Adapters of D-Link with the model number as DFE-538TX are used. The number of such cards used is of course one for each of the 155 machines in the network. The card is chosen because of its features like 10/100 Mbps data transmission capability, full duplex mode of the data transmission, great software compatibility and easy upgradability.
DLINK DES-1024D(24 PORT)
DES-1024D is a 24 port unmanaged switch. It has 24 10/100 Mbps auto-sensing ports that automatically sense whether a network device is running at 10Mbps or 100Mbps then automatically adjusting itself for optimal performance. All ports are auto negotiating (Full or Half Duplex) — negotiating and running the highest supported transmission rate whether at Half- or Full-Duplex. It supports Auto MDI/MDIX Crossover ports —offering auto-negotiating MDI/MDIX detection on every port to eliminate the need for crossover cables or uplink ports.
The DES-1024D features non-blocking wire-speed architecture with a 4.8Gbps switching capacity, for maximum data throughput. It also features an integrated universal power supply, and per port diagnostics LEDs that make it easy to “spot check” for problems. With wire-speed filtering and Store-and-Forward switching, the DES-1024D also maximizes network performance while minimizing the propagation of bad network packets. This intelligent, easy-to-use 10/100BASE-T switch will enhance and compliment any existing network infrastructure and deliver the performance that IT managers and other SMB network administrators demand.
D-LINK DES-1016D(I6 PORT )
D-Link DES-1016D is an unmanaged 10/100Mbps switch
designed to enhance small workgroup performance while providing a high level of
flexibility. Powerful yet easy to use, this device allows users to simply plug
any port to either a 10Mbps or 100Mbps network to multiply bandwidths, boost
response time and satisfy heavy load demands.
D-LINK DES-1008D(8 PORT)
D-Link DES-1008D is an unmanaged 10/100Mbps switch
designed to enhance small workgroup performance while providing a high level of
flexibility. Powerful yet easy to use, this device allows users to simply plug
any port to either 10Mbps or 100Mbps network to multiply bandwidths, boost
response time and satisfy heavy load demands.
The D-Link DLM 2000 series are High - bit - rate Digital Subscriber Line (HDSL) systems which deliver 2.048Mbps E1 service to the customer up to 4.5 Km (2.8 miles) length over four 24 AWG (0.5 mm) Lines. These are among the most affordable modems in the market that provide good quality as well. Only one modem is required at the Admin Block to get connected to the ISP using the Leased Line.
D-LINK
DSL-500
This device combines ADSL broadband WAN connection with IP routing,
transparent bridging and Internet gateway functions, all in one compact box. It
can be used to connect your SOHO to your corporate head office and to the
Internet.
An ADSL modem is built into this device. The device links a branch office with
a remote LAN such as a head office or another branch office by routing IP
packets and transparently bridges non-IP packets.
It also acts as a broadband Internet gateway for your SOHO. Cost-saving
Internet functions NAT and DHCP are provided, allowing your entire office to share
one single broadband line and one single ISP account. The device automatically
assigns IP address for your office users, while masking these addresses from
others on the Internet. This kind of firewall makes it more difficult for a
hacker to target a computer on your network.
This Network is designed to have enough flexibility and future scope. The Network can also be extended to other buildings also. But they will need to be routed to the Admin Block via some already existing block in the Network because there are not extra termination points out there at present. But if needed, that can also be managed easily by stacking another switch.
The D-LINK D-500 router, that is used here , has the feature for accommodating another ISDN module. So, at any time, we can add another ISDN Line as a back up connectivity link for the Internet. Though the router has only one WAN port, so no extra Leased Line may be added later on without changing the router itself.
Not many limitations came across designing this Network. But still there are some limitations that made some decisions compulsory. Followings are those facts: