Int-Serv The model provides users with end-to-end absolute

The Integrated Services (Int-Serv) architecture provides end-to-end absolute Quality of Service (QoS) guarantees and explicit bandwidth reservation across an IP network path. Int-Serv uses the Resource Reservation Protocol (RSVP) to signal requirement specifications and reserve necessary resources at every intermediate hop along the communication path before transmission begins. Because resources are dedicated exclusively to specific traffic flows, Int-Serv guarantees bounded delay, minimal jitter, and guaranteed bandwidth. However, this deterministic model requires maintaining per-flow state information on every router along the path, which limits its scalability in massive networks. Nonetheless, the primary defining operational characteristic of Int-Serv remains its capability to offer strict, absolute end-to-end bandwidth reservation and guaranteed QoS for mission-critical application flows.

B. Low forwarding efficiency is an operational disadvantage of Int-Serv due to per-flow processing, not the end-to-end service guarantee provided to user traffic.
C. Poor scalability is an architectural drawback of maintaining per-flow state tables on core routers, rather than the end-to-end service commitment offered to users.
D. Traffic monitoring is not inherently prevented by Int-Serv; rather, flow state tracking actually facilitates granular traffic inspection despite high control plane overhead.

- Huawei Enterprise Documentation, "IP QoS Configuration Guide - Int-Serv and RSVP Overview", Section: QoS Architecture.

- IETF RFC 2205, "Resource ReServation Protocol (RSVP) -- Version 1 Functional Specification".

- IETF RFC 1633, "Integrated Services in the Internet Architecture: an Overview".