Integrated Services Architecture (ISA) is an architecture that specifies the elements to guarantee the quality of service (QoS) on networks. It was intended to provide QoS transport over IP-based internets and defined in RFC 1633. a) Traffic on a network or internet can be divided into two broad categories: elastic and inelastic. Briefly EXPLAIN about both the categories. IDENTIFY applications and their QoS requirements for each category. b) Identify THREE (3) types of services by ISA. EXPLAIN the key elements of each service.

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