Application Level Protocols

Application level protocols are the set of rules and formats that govern the communication between two or more devices over the internet. These protocols are used to transmit data over the internet and enable users to access various services and applications.

Different types of application-level protocols are available, and some of the most commonly used ones are:

1. FTP (File Transfer Protocol): FTP is a protocol that is used to transfer files between two devices over the internet.

2. S/MIME (Secure/Multipurpose Internet Mail Extensions): S/MIME is a protocol that is used to secure and authenticate email messages.

3. PGP (Pretty Good Privacy): PGP is a protocol that is used to encrypt and decrypt email messages.

4. HTTP (Hypertext Transfer Protocol): HTTP is a protocol that is used to transfer data between web servers and clients.

Which is not the application level protocol?

The correct answer is option 'A' (FTP) because FTP is a transport-level protocol that operates at a lower level than the application layer. FTP is used to transfer files between two devices, but it does not define the format of the data being transmitted.

Conclusion

In conclusion, application level protocols are essential for enabling communication between devices over the internet. Different types of application-level protocols are available, and each has its unique features and functions. FTP is not an application-level protocol but a transport-level protocol that operates at a lower level than the application layer.