What are three Application Layer protocols? (Choose three.)
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A. B. C. D. E.ABE
The Application Layer is the topmost layer in the OSI (Open Systems Interconnection) model, and it provides services to the end-user applications. Application Layer protocols are used for communication between applications running on different hosts.
Here are the detailed explanations of the three Application Layer protocols mentioned in the question:
FTP (File Transfer Protocol): FTP is a client-server protocol used for transferring files between hosts over a TCP/IP network. FTP clients can upload, download, rename, delete, and modify files on an FTP server.
HTTP (Hypertext Transfer Protocol): HTTP is a client-server protocol used for transmitting hypertext documents, such as HTML files, over a TCP/IP network. HTTP is the foundation of the World Wide Web, and it is used by web browsers to request web pages from web servers.
DNS (Domain Name System): DNS is a client-server protocol used for translating domain names, such as www.example.com, into IP addresses, such as 192.0.2.1. DNS is essential for the functioning of the Internet, and it is used by web browsers, email clients, and other networked applications.
TCP (Transmission Control Protocol) and ATM (Asynchronous Transfer Mode) are not Application Layer protocols. TCP is a Transport Layer protocol that provides reliable, ordered, and error-checked delivery of data between applications. ATM is a Data Link Layer protocol used for transmitting data over high-speed networks, such as fiber-optic networks.