Internetworking is the practice of connecting a computer network with other networks through the use of gateways that provide a common method of routing information packets between the networks. The resulting system of interconnected networks are called an internetwork, or simply an internet.

The service model of internetworking involves the definition of two key aspects: the service provided to the transport layer and the internal operation of the network. The service model defines what the network should do and not how it should be done. It includes aspects like the network service access point (NSAP), which is the point where the transport layer accesses the network service, and the quality of service, which includes parameters like throughput, transit delay, etc.

Global addressing is a key feature of internetworking. In an internetwork, each host must have a unique address that determines where it is. This address is typically known as an IP address in the Internet. It's a numerical label assigned to each device participating in a computer network that uses the Internet Protocol for communication. The role of this global address is to ensure that the messages are properly routed across the internetwork.

A datagram is a basic transfer unit associated with a packet-switched network. In the context of internetworking, a datagram is composed of an IP header and a payload. The IP header contains source and destination IP addresses that routers use to forward the datagram between hosts, while the payload is the actual data that the datagram is delivering to the destination. Datagram service is often compared to a postal system for delivering mail – the internet protocol does not guarantee that all packets will arrive, nor that they will be in order when they do. This is known as a connectionless or best-effort protocol.

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Internetworking is the practice of connecting a computer network with other networks through the use of gateways that provide a common method of routing information packets between the networks. The resulting system of interconnected networks are called an internetwork, or simply an internet.

The service model of internetworking involves the definition of two key aspects: the service provided to the transport layer and the internal operation of the network. The service model defines what the network should do and not how it should be done. It includes aspects like the network service access point (NSAP), which is the point where the transport layer accesses the network service, and the quality of service, which includes parameters like throughput, transit delay, etc.

Global addressing is a key feature of internetworking. In an internetwork, each host must have a unique address that determines where it is. This address is typically known as an IP address in the Internet. It's a numerical label assigned to each device participating in a computer network that uses the Internet Protocol for communication. The role of this global address is to ensure that the messages are properly routed across the internetwork.

A datagram is a basic transfer unit associated with a packet-switched network. In the context of internetworking, a datagram is composed of an IP header and a payload. The IP header contains source and destination IP addresses that routers use to forward the datagram between hosts, while the payload is the actual data that the datagram is delivering to the destination. Datagram service is often compared to a postal system for delivering mail – the internet protocol does not guarantee that all packets will arrive, nor that they will be in order when they do. This is known as a connectionless or best-effort protocol.

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Internetworking is the practice of connecting a computer network with other networks through the use of gateways that provide a common method of routing information packets between the networks. The resulting system of interconnected networks are called an internetwork, or simply an internet.

The service model of internetworking involves the definition of two key aspects: the service provided to the transport layer and the internal operation of the network. The service model defines what the network should do and not how it should be done. It includes aspects like the network service access point (NSAP), which is the point where the transport layer accesses the network service, and the quality of service, which includes parameters like throughput, transit delay, etc.

Global addressing is a key feature of internetworking. In an internetwork, each host must have a unique address that determines where it is. This address is typically known as an IP address in the Internet. It's a numerical label assigned to each device participating in a computer network that uses the Internet Protocol for communication. The role of this global address is to ensure that the messages are properly routed across the internetwork.

A datagram is a basic transfer unit associated with a packet-switched network. In the context of internetworking, a datagram is composed of an IP header and a payload. The IP header contains source and destination IP addresses that routers use to forward the datagram between hosts, while the payload is the actual data that the datagram is delivering to the destination. Datagram service is often compared to a postal system for delivering mail – the internet protocol does not guarantee that all packets will arrive, nor that they will be in order when they do. This is known as a connectionless or best-effort protocol.

2. What is internetworking? Explain its service model, global address and datagram in detail.

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