INTERNETWORKING
Internetworking
What Is an Internetwork?
An internetwork is a collection of individual networks, connected by intermediate networking devices, that functions as a single large network.
Internetworking refers to the industry, products, and procedures that meet the challenge of creating and administering internetworks.
History of Internetworking
The first networks were time-sharing networks that used mainframes and attached terminals. Such environments were implemented by both IBM's Systems Network Architecture (SNA) and Digital's network architecture.
Local-area networks (LANs) evolved around the PC revolution. LANs enabled multiple users in a relatively small geographical area to exchange files and messages, as well as access shared resources such as file servers and printers.
Wide-area networks (WANs) interconnect LANs with geographically dispersed users to create connectivity.
Today, high-speed LANs and switched internetworks are becoming widely used, largely because they operate at very high speeds and support such high-bandwidth applications as multimedia and videoconferencing. This lack of network management meant that no centralized method of managing and troubleshooting networks existed.
Connectionless Internetworking
Advantages
Flexibility
Robust
No unnecessary overhead
Unreliable
Not guaranteed delivery
Not guaranteed order of delivery
Packets can take different routes
Reliability is responsibility of next layer up (e.g. TCP)
Internetworking Challenges
Areas of connectivity
Reliability
Network management
Flexibility
Implementing a functional internetwork is no simple task. Many challenges must be faced, especially in the areas of connectivity, reliability, network management, and flexibility. The challenge when connecting various systems is to support communication among variety of technologies. Different sites, for example, may use different types of media operating at varying speeds, or may even include different
What Is an Internetwork?
An internetwork is a collection of individual networks, connected by intermediate networking devices, that functions as a single large network.
Internetworking refers to the industry, products, and procedures that meet the challenge of creating and administering internetworks.
History of Internetworking
The first networks were time-sharing networks that used mainframes and attached terminals. Such environments were implemented by both IBM's Systems Network Architecture (SNA) and Digital's network architecture.
Local-area networks (LANs) evolved around the PC revolution. LANs enabled multiple users in a relatively small geographical area to exchange files and messages, as well as access shared resources such as file servers and printers.
Wide-area networks (WANs) interconnect LANs with geographically dispersed users to create connectivity.
Today, high-speed LANs and switched internetworks are becoming widely used, largely because they operate at very high speeds and support such high-bandwidth applications as multimedia and videoconferencing. This lack of network management meant that no centralized method of managing and troubleshooting networks existed.
Connectionless Internetworking
Advantages
Flexibility
Robust
No unnecessary overhead
Unreliable
Not guaranteed delivery
Not guaranteed order of delivery
Packets can take different routes
Reliability is responsibility of next layer up (e.g. TCP)
Internetworking Challenges
Areas of connectivity
Reliability
Network management
Flexibility
Implementing a functional internetwork is no simple task. Many challenges must be faced, especially in the areas of connectivity, reliability, network management, and flexibility. The challenge when connecting various systems is to support communication among variety of technologies. Different sites, for example, may use different types of media operating at varying speeds, or may even include different