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A service is a program on the computer that provides a function for your software, such at the NetBIOS service that connects windows workgroup machines, or the DHCP Client that acquires a network address for your computer when you connect to the internet. A protocol is a language the computer uses to exchange information. For example, TCP/IP is used to negotiate connection and transfer data over the Internet, and HTTP is a protocol that handles transferring data between WWW servers, and clients.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoThree concepts are central to the OSI layers:
1. Services
2. Interfaces
3. Protocols
The service defines what the layer does for the upper layer,not how entities above access it.
The layer's interface tells the upper layers HOW TO ACCESS IT.
The protocols used in a layer are of its own business. It can be changed anytime without affecting software in higher layers.
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