Application Layer Protocols

Front 1

A hierarchical way of tracking domain names and their addresses. It is distributed over several key computers across the Internet to prevent catastrophic failure if one or a few computers go down.

Back 1

DNS
Domain Name System
Domain Name Service

Front 2

Manages the dynamic distribution of IP addresses on a network. Its use can nearly eliminate duplicate addressing problems.

Back 2

DHCP
Dynamic Host Configuration Protocol

Front 3

A protocol used to send and receive files via TCP/IP.
Uses TCP ports 20 and 21.

Back 3

FTP
File Transfer Protocol

Front 4

A protocols that enables file transfers between computers.
Relies on UDP port 69.
Does not require a user to log on to the remote host.

Back 4

TFTP
Trivial File Transfer Protocol

Front 5

A protocol that formulates and interprets requests between Web clients and servers.
Uses TCP port 80.

Back 5

HTTP
Hypertext Transfer Protocol

Front 6

A protocol that requires its data to be exchanged between Web clients and servers using SSL encryption.
Uses TCP port 443.

Back 6

HTTPS
Secure Hypertext Transfer Protocol

Front 7

The current version of a mail retrieval protocol which allows users to store messages on a mail server, rather than to download them to the local machine.
Uses TCP port 143.

Back 7

IMAP4
Internet Message Access Protocol version 4

Front 8

The current version of a protocol used to retrieve messages from a mail server. Messages previously stored on the mail server are downloaded to the client's workstation and then deleted from the mail server.
Uses TCP port 110.

Back 8

POP3
Post Office Protocol version 3

Front 9

A standard protocol used for accessing network directories.

Back 9

LDAP
Lightweight Directory Access Protocol

Front 10

A protocol that uses TCP/IP to transmit graphics and text quickly over a remote client-host connection.
IT also carries session, licensing, and encryption information.
Uses TCP port 3389.

Back 10

RDP
Remote Desktop Protocol

Front 11

A terminal emulation protocol used to lo on to remote hosts using the TCP/IP protocol.
Uses TCP port 23.

Back 11

Telnet

Front 12

A standard for encoding and interpreting binary files, images, video, and non-ASCII character sets within an e-mail message.

Back 12

MIME
Multipurpose Internet Mail Extension

Front 13

A sub-protocol responsible for moving messages from one e-mail server to another.
Uses TCP port 25.

Back 13

SMTP
Simple Message Transfer Protocol

Front 14

A protocol used to convey data regarding the status of managed devices on a network.

Back 14

SNMP
Simple Network Management Protocol

Front 15

A connection utility that provides authentication and encryption. It encrypts data exchanged throughout the session.
Uses TCP port 22.

Back 15

SSH
Secure Shell

Front 16

A protocol used to provide centralized AAA for multiple users.
Runs over UDP.

Back 16

RADIUS
Remote Authentication Dial-In User Service.

Front 17

A protocol that associates NetBIOS names with workstations. It is not routable in itself, but can be encapsulated into another protocol such as TCP/IP to become routable.

Back 17

NetBIOS

Front 18

A protocol in the TCP/IP suite used to synchronize the clocks of computers on a network.

Back 18

NTP
Network Time Protocol