<P> Capacity management interacts with the discipline of Performance Engineering, both during the requirements and design activities of building a system, and when using performance monitoring as an input for managing capacity of deployed systems . </P> <P> Not all networks are the same . As data is broken into component parts (often known frames, packets, or segments) for transmission, several factors can affect their delivery . </P> <Ul> <Li> Delay: It can take a long time for a packet to be delivered across intervening networks . In reliable protocols where a receiver acknowledges delivery of each chunk of data, it is possible to measure this as round - trip time . </Li> <Li> Packet loss: In some cases, intermediate devices in a network will lose packets . This may be due to errors, to overloading of the intermediate network, or to the intentional discarding of traffic in order to enforce a particular service level . </Li> <Li> Retransmission: When packets are lost in a reliable network, they are retransmitted . This incurs two delays: First, the delay from re-sending the data; and second, the delay resulting from waiting until the data is received in the correct order before forwarding it up the protocol stack . </Li> <Li> Throughput: The amount of traffic a network can carry is measured as throughput, usually in terms such as kilobits per second . Throughput is analogous to the number of lanes on a highway, whereas latency is analogous to its speed limit . </Li> </Ul> <Li> Delay: It can take a long time for a packet to be delivered across intervening networks . In reliable protocols where a receiver acknowledges delivery of each chunk of data, it is possible to measure this as round - trip time . </Li>

Discuss the legal aspects of buying and capacity management