Monday, January 16, 2006

Planning and Building a network

Building a network requires careful consideration of the process and parameters that will drive its success. The illustration shows the general process applied to a network

Planning the network means to consider applications, performance, connectivity, security and reliability. Applications and performance normally goes together from a network point of view, its important to know actual application needs and how many users or instances. The following table gives an example of common application needs.


Connectivity, affects how users are connected to the network or how a site is connected to other sites. This could be driven by application requirements or availability options as in the case with Workers Bank. Wireless maybe used in a campus environment while a WAN would have ADSL, T1, DS3 or in some cases Metro Ethernet. Security would come in different levels including physically securing network equipment, limit access to the network and protecting actual network data with encryption for example. The following is an example of connectivity using Virtual Private Network (VPN) protocol such as Internet Protocol Security (IPSEC – RFC2401).

Reliability covers many aspects from physical provisioning such as battery backups to protocols used in link failures. Protocols used at MAC layer are 802.1d (STP), LAG, and MLPPP. Network layer could use dynamic routing, VRRP and Server load balancing implementation.

Documenting the design with all the above factors could mean using simulation models to fine the design then move to implementation.

Deployment or implementation means planning and ensuring the environment is ready, pre-stage and test equipment to ensure things will go smoothly. You then need to verify the installation using the many management tools available which can also be used for long term management.

Management means to ensure the network is available and look at parameters that may require optimization or generate a new network project for example with addition of more users or more demanding applications.

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