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.
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A procedure is a set way to do something. A step by step process. Protocols are guidelines only on how to do something.
Interior routing protocols are used to communicate within a single autonomous system. Exterior routing protocols are used to communicate between multiple autonomous systems.
•difference between service and delight
-Unacknowledged connectionless service consists of having the source machine send independent frames to the destination machine without having the destination machine acknowledged. Most LAN's use this service. -Acknowledged connectionless service in this service there are no logical connections used but each frame sent individually acknowledged. In this way the sender knows whether a frame has arrived correctly. It is useful on wireless systems.
Classless protocols send a subnet mask with each route advertisement
the difference between the two is the zone of tolerance
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