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The Hypertext Transfer Protocol (HTTP) is used for transferring webpages on the internet from a server to a client.

The Hypertext Transfer Protocol Secure (HTTPS) is the secure version of HTTP, using encryption to ensure secure data transfer.

The File Transfer Protocol (FTP) is used for transferring files between a client and a server on a computer network.

Simple Mail Transfer Protocol (SMTP) is used for sending emails from a client to a server or between servers.

Post Office Protocol version 3 (POP3) is used by email clients to retrieve emails from a server to a local computer.

Internet Message Access Protocol (IMAP) is used to access and manage emails directly on the mail server.

Dynamic Host Configuration Protocol (DHCP) is used to automatically assign IP addresses to devices on a network.

Domain Name System (DNS) translates human-readable domain names to machine-readable IP addresses.

Transmission Control Protocol (TCP) provides a reliable, ordered, and error-checked delivery of a stream of data between applications.

User Datagram Protocol (UDP) is a lightweight, connectionless protocol used for applications that require speed over reliability.

Internet Protocol (IP) is responsible for addressing and routing packets of data so that they can travel across networks and arrive at the correct destination.

Address Resolution Protocol (ARP) is used to map an IP address to a machine's physical address on a local area network (LAN).

Border Gateway Protocol (BGP) is used to exchange routing information between autonomous systems on the internet.

Open Shortest Path First (OSPF) is a link-state routing protocol used to find the best path for data packets within a single routing domain.

Simple Network Management Protocol (SNMP) is used for collecting and organizing information about managed devices on IP networks and for modifying that information.

Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network.

Secure Sockets Layer (SSL) and Transport Layer Security (TLS) are cryptographic protocols designed to provide communications security over a computer network.

Real-time Transport Protocol (RTP) is used for delivering audio and video over IP networks, particularly during streaming media.

Session Initiation Protocol (SIP) is used to initiate, maintain, modify, and terminate real-time sessions that involve video, voice, messaging, and other communications applications and services between two or more endpoints on IP networks.

Remote Authentication Dial-In User Service (RADIUS) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service.

Trivial File Transfer Protocol (TFTP) is a simple, lockstep, file transfer protocol with no authentication, used for transferring small files.

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary routing protocol that uses a composite metric, considering bandwidth and delay by default, to select the best path to a destination network within an autonomous system.

Link Layer Discovery Protocol (LLDP) is used by network devices for advertising their identity, capabilities, and neighbors on an IEEE 802 local area network, principally wired Ethernet.

Network Time Protocol (NTP) is used to synchronize the clocks of computers to some time reference over a network.