--- title: "NTA functions; IP switching structure" subject: "Telecommunications" chapter: 7 key: "semester_8/telecommunications:nta-functions-ip-switching" source: https://www.bctengineer.com/q/semester_8/telecommunications/nta-functions-ip-switching site: BCT Engineering --- # NTA functions; IP switching structure Telecommunications · Chapter 7: Telecommunication Regulation - Asked in: 2079 Chaitra, 4+4 marks - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/telecommunications/nta-functions-ip-switching - Whole chapter: https://www.bctengineer.com/md/semester_8/telecommunications/chapter-7 ## Question What are the function and duties of NTA? Describe about IP switching with its switch structure. ## Short answer NTA licenses operators, manages spectrum, regulates tariffs and interconnection, and ensures fair competition and QoS. IP switching combines IP routing with fast ATM/label switching: a controller identifies flows, assigns labels via IFMP, and then the switch fabric forwards subsequent packets in hardware at line speed using GSMP, forming the basis for MPLS. ## Answer #### Functions and duties of NTA The **Nepal Telecommunications Authority (NTA)**, set up under the **Telecommunications Act, 2053 (1997)**, has these main functions and duties: 1. Issue, renew and regulate **licences** for telecom services. 2. **Allocate and monitor radio frequencies**. 3. **Approve tariffs** and regulate interconnection between operators. 4. Ensure **fair competition** and prevent monopoly. 5. Prepare and manage the **national numbering plan**. 6. Set and monitor **quality of service** standards. 7. Protect **consumer interests** and settle disputes. 8. Manage the **Rural Telecommunication Development Fund** to extend services to rural areas. 9. **Type approval** of equipment and adoption of standards. 10. Advise the Government on telecom policy. #### IP switching **IP switching** combines fast Layer-2 (ATM or label) switching with Layer-3 IP routing. In plain IP routing every packet is examined and routed hop by hop in software, which is slow. In IP switching the switch identifies a **flow** (a long sequence of packets between the same source and destination). The first few packets are routed normally; then a label/VC is assigned to the flow and later packets are **switched in hardware** without full IP lookup. Ipsilon's IP switching used this idea, and it was later developed into **MPLS**. **IP switch structure** ```text +-----------------------------+ | IP switch controller | | (IP routing software, | | flow classifier, IFMP, | | routing protocols) | +--------------+--------------+ | GSMP (control) +--------------+--------------+ in --->| ATM / label switching |---> out in --->| hardware (fabric) |---> out +-----------------------------+ ``` - **Switching hardware:** an ATM switch fabric (or label switch) that forwards cells at high speed. - **IP switch controller:** a router-like processor running IP routing protocols (OSPF, BGP) and flow classification. - **GSMP (General Switch Management Protocol):** the controller uses it to set up and release connections in the fabric. - **IFMP (Ipsilon Flow Management Protocol):** tells neighbouring switches to attach a label/VC to a flow. **Operation** 1. Packets arrive on a default channel and are routed by the controller. 2. The controller classifies traffic; short flows (DNS, single packets) continue to be routed. 3. For a long flow, it asks the upstream node (IFMP) to send that flow on a new VC/label. 4. A connection is set across the fabric (GSMP), and later packets are switched at hardware speed. 5. Idle flows are timed out and their labels released. **Advantages:** high throughput, lower delay, QoS support, and scalability; this idea led to MPLS used in today's ISP backbones. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Under which law was the Nepal Telecommunications Authority set up? A. Telecommunications Act, 2053 (1997) B. Electronic Transactions Act, 2063 C. Nepal Telecom Corporation Act, 2045 D. Radio Act, 2014 Answer: A. The answer states NTA was set up under the Telecommunications Act, 2053 (1997). (Key point: NTA's legal basis) 2. What is the purpose of the Rural Telecommunication Development Fund managed by NTA? A. To pay NTA staff salaries B. To extend telecom services to rural areas C. To subsidise imported handsets D. To fund international gateways Answer: B. NTA manages the fund to extend services to rural areas. (Key point: Rural Telecommunication Development Fund) 3. How does IP switching speed up forwarding compared with plain IP routing? A. It compresses every packet header B. It routes every packet in software using larger tables C. It assigns a label/VC to a long flow so later packets are switched in hardware without full IP lookup D. It sends all packets by flooding Answer: C. After the first few packets are routed normally, the flow gets a label/VC and later packets are hardware switched. (Key point: Idea of IP switching) 4. In an IP switch, what do GSMP and IFMP do? A. GSMP tells neighbours to label a flow; IFMP routes OSPF B. Both classify flows inside the fabric C. GSMP sets up connections in the switch fabric; IFMP tells the upstream node to send a flow on a label/VC D. Both are used only for DNS traffic Answer: C. The controller uses GSMP to control the fabric and IFMP to ask neighbours to attach a label/VC to a flow. 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