Determining Requirements

Determining the network requirements is a part of the PDIOO Plan phase. Many types of requirements must be considered, including those that are related to technical and business issues. Any factors that might restrict the design must also be identified. In the case where an existing network is in place, these constraints can be related to what is already there and how the new network must be phased in to allow continuous operation.

Technical requirements and restraints can include the following items:

• Applications that are to run on the network

• Internet connections required

• Addressing restrictions, for example, the use of private Internet Protocol (IP) version 4 (IPv4) addresses

• Support for IP version 6 (IPv6) addresses

• Other protocols that are to run on the network (for example, routing protocols)

• Cabling requirements

• Redundancy requirements

• Use of proprietary equipment and protocols

• Existing equipment that must be supported

• Network services required, including quality of service (QoS) and wireless

• How security is to be integrated into the network

• Network solutions required (for example, voice traffic, content networking, and storage networking)

• Network management

• Support for existing applications while new ones are being phased in

• Bandwidth availability

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