Network Design For The Architecture Computer Science Essay

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This report included the network design for the architecture firm. Firm the firms office consists of five rooms plus a reception area all on a single floor. This report includes 3 parts. Part 1 is the network design within the office. Part 2 consists of company intranet and extranet design including data storage and bandwidth requirements. Part 3 includes the security measures need to be taken to secure the extranet and internal network. Task 1 includes different options available for network design and cabling. Task 2 includes the design of an intranet and extranet. Final part includes the security measures need to be applied to the network and the servers.

Out of the different options available option 3 hybrid of wired and wireless networking is the preferred method for this scenario.


This design use IEEE 802.3 Ethernet standard with start topology. This topology avoids single point of failure and possible loops and congestions.

Wireless standard use will be IEEE 802.11n.

Selection of a network cable depends on the number of pcs and size of the network, protocols and topology used. Out of the Ethernet topologies used such as bus, star, ring and linear bus, token ring this design use start topology.


Installation easy

Simple configurations and modifications.

High availability

Support for UTP,Coaxial and fiber optic cables.


More cost than other options

single point of failure

Require more cables than bus topology

Diagram 2- Star Topology (RohitDhingra. 2012. Types of Network Topologies. [ONLINE] Available at: [Accessed 10 November 12].

Expanded star topology

This topology uses the start topology with linear bus topology as back bone. Often the backbone used fiber cables for long distance and speed.

Diagram - 3 Extended star topology (Florida Center for Instructional Technology. 2011. Cabling. [ONLINE] Available at: [Accessed 10 November 12].


Provide support for future expansions

Multi-vendor and technology support


High cost

Complex configurations

When compared with cost, expansion options, Cable types, and length of cables required and also the number of pcs and the servers as well as data storage requirements start topology is the best option.

Star topology supports UTP, fiber cables whereas bus topology supports coaxial, UTP only.

Types and connectors

Unshielded Twisted Pair (UTP) Cable

Diagram 4- UTP Cables (Florida Center for Instructional Technology. 2011. Cabling. [ONLINE] Available at: [Accessed 10 November 12].)

Two types of UTP cables use for Ethernet LAN

1. CAT 5 and CAT5e

2. CAT 6

CAT 5 supports up to 100Mbps (2 pair), 1000Mbps (4 pair) and CAT5e supports up to 1000Mbps. CAT 6 10,000Mbps. Maximum distance of UTP is between 80M-100M.

Connector used for UTP is RJ45 connector.

Shielded Twisted Pair (STP) Cable

UTP cables are exposed to electromagnetic interference (EMI) and disturbances. STP cables are shielded with foils to resists EMI.

In this scenario where the PCS are not susceptible to EMI and does not require use of STP.

Coaxial Cable

Diagram 5 -Coaxial cables (Florida Center for Instructional Technology. 2011. Cabling. [ONLINE] Available at: [Accessed 10 November 12].)

Coaxial cables use a metal conductor shielded by plastic layer insulated by a metal layer. Metal layer provide resistant from EMI. Coaxial cables can be used for long distance than UTP cables. Thin coaxial cables can be used up to 185M where as thick coaxial cables can be used up to 500m. Disadvantage of coaxial cable is difficult to install.

Coaxial cable connector

Connector used with coaxial cables is BNC connector.

Fiber Optic Cable

Fiber cables use glass protected by several layers to resist from EMI. Also fiber optics can transmit data for long distance over many miles connecting several buildings.

Diagram 6-Fiber Optical cables (Florida Center for Instructional Technology. 2011. Cabling. [ONLINE] Available at: [Accessed 10 November 12].)

According to the scenario fiber optics is not required as the offices are within short distance and within one building.

Wireless connection

Use of wireless access points in this design is backward compatible with 802.11a/b/g.

Technical requirements-Recommendations

Out of the above options design will be done using start topology of Ethernet using CAT 6 cables. Server room will have a 19"U rack with UPS power. Use of CAT 6 cables support additional features such as POE, higher speeds. Connectors use is RJ45 connectors and the two port faceplates use one port as a backup. All the cables connect to a patch panel and arrange using cable management units. Cisco Linksys manageable 24 port switch used to connect devices. This port includes 2 Gigabit uplinks and 1 combo port which can use for both fiber uplinks and UTP uplinks.

Internet connection should have 1Mbps bandwidth therefore a T1 line would be used. As a backup internet connection ADSL connection with 512 Mbps uplink and 1Mbps down link can be used. This link should support the upload and download of large capacity architectural drawings and for email.

Within the LAN 100Mbps speed

Table 2 - Cabling/connectors requirements

Diagram 7-Network design

Task 2

Requirements to design the intranet/extranet

Table 3 - Hardware/network specifications

Selection criteria

Cisco 1751 router provide VPN, dual WAN, and voice IP features with built in firewall.

Cisco SR224G switch has 2 Gbps uplinks an SFP /UTP support combo port for future expansions

HP Z210 workstation high graphic adapter and configuration is suitable for architects. Drawings

UTP CAT6 cables provide higher speed up to gigabit and power over Ethernet(POE).

Hp DL 380 server with RAID 5 provide redundancy high performance.

Cost of Hardware and installations

Table 4 - Cost of Installation and hardware


Diagram 8- Extranet

Task 3

Following security issues are considered


Email security

Internet security

Wireless security

Other security issues

Physical security

Table 5- Security controls


The design of network for architecture firm LAN, intranet and extranet is a challenging task. An extranet is a positive as well as negative risk to a company. Therefore the network design should have redundancy as well as security. The design provide the chance of getting knowledge of security and network design concepts including cabling, topologies, network capacity planning, and security.

This design is well support for future network expansions.