JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III PRINCIPLES OF COMPUTER COMMUNICATIONS AND NETWORKS Previous Question Paper (August - 2022 - R16)

Routing protocols are sets of rules used by routers to communicate with each other to determine the most efficient path for data packets to reach their destination. They are broadly classified into two categories: Interior Gateway Protocols (IGP) and Exterior Gateway Protocols (EGP).

1. Interior Gateway Protocols (IGP): These are used for routing within a single Autonomous System (AS).

• Distance Vector Routing: Routers share their entire routing table with immediate neighbors at regular intervals. Examples include RIP (Routing Information Protocol), which uses hop count as a metric, and IGRP. These are simple but suffer from slow convergence and count-to-infinity problems.
• Link State Routing: Each router maintains a complete map of the network topology. Routers broadcast link-state advertisements (LSAs) to all other routers. OSPF (Open Shortest Path First) is the most common example, using Dijkstra's algorithm to calculate the shortest path. It offers faster convergence and is more scalable than distance vector protocols.

2. Exterior Gateway Protocols (EGP): These are used for routing between different Autonomous Systems across the internet.

• BGP (Border Gateway Protocol): The standard EGP used on the internet. It is a path-vector protocol that maintains path information to reach specific networks. BGP focuses on policy-based routing rather than just technical metrics, allowing administrators to control traffic flow between organizations based on business or security agreements.

Comparison Summary:

Network standards are a set of established rules, protocols, and specifications that ensure compatibility, interoperability, and efficient communication between different hardware and software components within a computer network. They provide a common language that allows devices from various manufacturers to connect and exchange data seamlessly.

Standards are essential for the growth of networking because they prevent vendor lock-in, foster innovation, and ensure that networks remain scalable and reliable. They are primarily developed by international organizations to maintain consistency across global infrastructures.

Key organizations responsible for network standards include:

• IEEE (Institute of Electrical and Electronics Engineers): Responsible for physical and data link layer standards, most notably the IEEE 802 series, which defines Ethernet (802.3) and Wi-Fi (802.11).
• ISO (International Organization for Standardization): Developed the Open Systems Interconnection (OSI) model, which serves as the conceptual framework for understanding network communication in seven distinct layers.
• IETF (Internet Engineering Task Force): Focuses on the evolution of the Internet architecture and the smooth operation of the Internet, primarily through the development of Request for Comments (RFC) documents and TCP/IP protocols.
• ITU-T (International Telecommunication Union - Telecommunication Standardization Sector): Sets international standards for telecommunications, including data transmission over public networks and DSL technologies.
• ANSI (American National Standards Institute): Coordinates standards in the United States, often adopting or influencing international standards for data communications.

Standards are typically categorized into two types: De facto standards, which emerge through widespread market adoption and usage (e.g., TCP/IP), and De jure standards, which are officially mandated by recognized regulatory bodies after a formal development process.