X.400 and SMTP: Battle of the E-Mail Protocols
By John Rhoton

Highlights

Highlights
? Both TCP/IP and OSI networks are routable and are not limited to LANs.
? The addressing scheme of OSI allows for unlimited growth in the foreseeable future. IP will run out of addresses in the next few years and will need to be migrated to IPv6.
? IP is closely related to DNS, a universal and comprehensive scheme of naming hosts. OSI is not bound to any naming service, and there is no internationally accepted authority for administering one.
? Both OSI and IP offer connectionless network service. OSI also offers connection-oriented network service, but demand for it is decreasing.
? Connections in IP are made to a socket, which is an address, plus a protocol selector (e.g., TCP or UDP) and a port number. OSI connections are made to applications by specifying the address plus transport selector, session selector and presentation selector.
? OSI protocols typically use ASN.1 encoding to transfer data between systems. IP protocols often use text data, but for more complex interaction many are also now using binary form.
Copyright Butterworth-Heinemann 1997 under license agreement with Books24x7
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