Design a Network Term Paper

Pages: 11 (3241 words)  ·  Bibliography Sources: 1+  ·  Level: College Senior  ·  Topic: Education - Computers

¶ … Network

Structure and functions of networks nodes

Physical and channel levels

Protocol and applied level of network

Splitting network on subnets

Installation of DHCP server

Installation of DNS, WINS, IIS servers

Local network of an enterprise covers 120 personal computers of users and 15 servers on the base of PC Intel platform, which are situated on the four floors of the office building.

Every floor is designed on the base of specification 100 BASE-TX, wiring is represented by cable UTP Cat 5e. Network's speed is provided at the rate of 100 Mbps and network uses the same kind of Ethernet channel level packets. Besides client computers, network also contains printers. Maximum number of printers per floor is 10 items.

Switching is executed on each floor in wiring closet, one per floor. Wiring closets contain switchboards, patch -panels and 19" UPS. The distance from closet to working area of client computers does not exceed 90 meters.

For providing high switching speed network uses HP procurve switch 2324 on 24 ports. Because the total number of connections is 40 and there has to be a reserve for future connections, the number of 48 ports would satisfy future requirements of the network. Both switches are connected by high speed channel of 1 Gbps by means of using special modules. All three floors have the same type equipment.

On the ground floor there is also Intel router in wiring closet. Switchboards of all floors are connected to this router and it is used for providing internet connection.

Access to resources and to network is realized on the base of TCP/IP protocol. It will be pointless to install additional protocols. Server computers use Windows 2000 Server as an operation system and all network services are installed and set up on this operation system.

NOTE in Windows 2000, memory is more important than ever. The minimum requirement for... Professional is 64MB, and 128MB is recommended. Windows 2000 Server has a minimum requirement of 128MB and 256MB recommended."(from Donald, Lisa MCSE 2000 JumpStart: Computer Network Basics p.18)

Security of network resources is provided by directory service Active Directory: "Active Directory is an essential and inseparable part of the Windows 2000 network architecture that improves on the domain architecture of the Windows NT® 4.0 operating system to provide a directory service designed for distributed networking environments. Active Directory lets organizations efficiently share and manage information about network resources and users. In addition, Active Directory acts as the central authority for network security, letting the operating system readily verify a user's identity and control his or her access to network resources. Equally important, Active Directory acts as an integration point for bringing systems together and consolidating management tasks.

Combined, these capabilities let organizations apply standardized business rules to distributed applications and network resources, without requiring administrators to maintain a variety of specialized directories Active Directory provides a single point of management for Windows-based user accounts, clients, servers, and applications. It also helps organizations integrate systems not using Windows with Windows-based applications, and Windows-compatible devices, thus consolidating directories and easing management of the entire network operating system. Companies can also use Active Directory to extend systems securely to the Internet. Active Directory thus increases the value of an organization's existing network investments and lowers the overall costs of computing by making the Windows network operating system more manageable, secure, and interoperable.." (from Active Directory Overview (http://www.microsoft.com/windows2000/server/evaluation/features/dirlist.asp)

Moreover, managing and administrating large multi-domain networks is difficult. Because of this, Microsoft has introduced the Active Directory in Windows 2000. The Active Directory can replace NT domains, but also can serve as an upgrade" (Donald, Lisa MCSE 2000 JumpStart: Computer Network Basics p.265)

OS Windows 9x or Windows 2000/XP Professional are used as clients which are the members of domain.

WINS-server is installed and is functioning on one server-computer for addressing to network resources and to computers by their NetBIOS names. DNS server is used for providing functioning of directory service ActiveDirectory and for providing access to internet. In order to automatize registration and other operations with IP addresses in local net, network uses authorized DHCP-server in the domain. Access to corporative data inside net and from its filials is provided by Web-server on the base of Internet Information Services.

Structure and functions of networks nodes

Physical and channel levels

Let's take a closer look on the equipment and structure of physical and channel level. In local network on client computers network adapters of 100 Mbps are used, which work in the full duplex mode. Horizontal subsystem is designed by cable UTP Cat 5e in decorative boxes.

On each floor wiring closets installed. For design of network and connection of floor switchboards with central Intel router it was decided to use optical fiber cable and extension modules or cascading switches of HP series J4817A procurve switch 2324 (24 ports RJ45). The use of HP J4817A switches is the most advantageous decision in category price/quality if compare to such switches as Cisco, 3 com and Intel. In each wc of the floor two HP J4817A procurve switch 2324 switches are cascading, so reserve of ports is also planned for expanding network and adding client computers in future.

On the ground floor two decisions may be made, depending on the loading on server: connection servers into ports of switches RJ45 10/100 and connection to ports 1 Gbps through extension modules. The second decision is more advantageous for domain controller and file servers of network. For servers and internet services the speed of 100 Mbps would be enough.

Protocol and applied level of network

Local network uses several servers on the base of OS Windows 2000. In the research there would be developed recommendations and setup preferences for network services such as Active Directory, DNS, DHCP, WINS and IIS. For simplicity of realization, increasing security level and efficiency services are installed on different servers.

The first stage of installation-is installation of operation systems Windows 2000 Server. During installation Network preferences should be defined: Access service, Client of Microsoft Network, Protocol TCP/IP. Static addresses will be discussed later, now it's important to mark that servers on which given services will be functioning must have static IP address. Services WINS and DHCP have to chosen for installation, IIS is setup by default, that's why its installation has to be canceled everywhere and only be left on that server, where it'll be functioning. DNS service will be installed with Active Directory later.

After installation of network servers Active Directory has to be installed by utility dcpromo: "use Active Directory promotion (Dcpromo.exe) to add domain controllers to Windows 2000 server forests."(from How Dcpromo.exe Adds Display Specifiers to Active Directory Forests available on web: (http://support.microsoft.com/?kbid=308592).

Domain's name ELBRYN.COM is chosen for corporation. NetBIOS name of ELBRYN domain will be used by WINS service. After reloading domain's controller we set servers of the domain by program System/Network identification. Using the same method later domain members-personal computers with Operation system Windows 2000/XP Professional are added. After reloading of servers it's important to finish setting parameters of TCP/IP protocol of network connections of servers. Then addresses of DNS and WINS servers are added to all servers.

Splitting network on subnets

Local network uses IP addresses with networks address 208.32.16.0/24. After splitting network on 4 subnets and connecting them through router it's important to revise and redefine nets addresses.

For splitting network of 255 addresses on 4 ranges the following mask is used: 255.255.255.192 which corresponds to binary value of 11111111.11111111.1111111.11000000 where first two bits are used for sub-nets addressing, and 6 ending bits are used for nodes addressing. So, every subnet may consist of (64-2=62) 62 functioning computers. First and last address of sub-net's range cannot be used for nodes and one address of each range will be used by router's port. So there are 61 available addresses for networks nodes. This quantity satisfies the task, as it was asked to connect up to 40 nodes (computers or printers) on the 1-3 floors and 45 nodes on the ground level.

For chosen splitting on 4 sub-nets the following sub-nets and rages are got:

208.32.16.0-255.255.255.192, addresses 208.32.16.1-208.32.16.62 (third floor)

208.32.16.64-25.255.255.192, addresses 208.32.16.65-208.32.16.126 (second floor)

208.32.16.128-255.255.255.192, addresses 208.32.16.129-208.32.16.190 (first floor)

208.32.16.192-255.255.255.192, addresses 208.32.16.193-208.32.16.254 (ground level).

The last addresses of each range will be used for router's port. These are the following addresses: 208.32.16.62, 208.32.16.126, 208.32.16.190, 208.32.16.254

Besides for domain controller the following address is used 208.32.16.232, server DHCP 208.32.16.230, server WINS 208.32.16.231, server IIS 208.32.16.233. Also network will have the following feature: addresses starting from 208.32.16.230 and ending with 208.32.16.254 would be given by DHCP server to "rent." So, there would be 230-193=37 addresses left, which is enough for 30 existing client computers.

Installation of DHCP server

For setting DHCP service corresponding equipment is launched and then the work of server in the domain ELBRYN is authorized. It order to do it, administrator has to log in the system on that server under user's name, which is in the group Enterprise administrators or in… [END OF PREVIEW]

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