Application layer

• Makes sure that the other party is identified and can be reached
• If appropriate, authenticates either the message sender or receiver or both
• Makes sure that necessary communication resources exist (for example, is there a modem in the sender's computer?)
• Ensures agreement at both ends about error recovery procedures, data integrity, and privacy
• Determines protocol and data syntax rules at the application level

Read more about Application layer: - SearchNetworking.com provides links to information about "Network Design." - The Recommendation X.200...Open Systems Interconnection - The basic reference model can be ordered from the ITU-S.

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