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Remote Control Protocols

CompTIA lists three protocols that are associated with remote-control access: Remote Desktop Protocol (RDP), Secure Shell (SSH), and Citrix Independent Computing Architecture (ICA). RDP is used in a Windows environment. Terminal Services provides a way for a client system to connect to a server, such as Windows Server 2008/2003/2000, and, by using RDP, operate on the server as if they were local client applications. Such a configuration is known as thin client computing, whereby client systems use the resources of the server instead of their local processing power.

Windows Server products and Windows 7 (as well as Vista and XP) have built-in support for remote desktop connections. The underlying protocol used to manage the connection is RDP. RDP is a low-bandwidth protocol used to send movements, keystrokes, and bitmap images of the screen on the server to the client computer. RDP does not actually send data over the connection - only screenshots and client keystrokes.

SSH is a tunneling protocol originally created for UNIX systems. It uses encryption to establish a secure connection between two systems and provides alternative, security-equivalent applications for such utilities as Telnet, FTP, and other communications-oriented applications. Although it is available with Windows and other operating systems, it is the preferred method of security for Telnet and other cleartext-oriented programs in the UNIX environment. SSH uses port 22 and TCP for connections.

Citrix ICA enables clients to access and run applications on a server, using the server's resources. Only the user interface, keystrokes, and mouse movements transfer between the client system and the server. In effect, even though you work at the remote computer, the system functions as if you were actually sitting at the computer itself. As with Terminal Services and RDP, ICA is an example of thin client computing.

The above is an excerpt from:

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More Networking Protocols and Standards:
• Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Routing Convergence
• The OSI Network Layer
• IEEE 802.11 Wireless Modulation Methods
• Active Directory : How Objects Are Stored and Identified
• What Is Fabric Networking?
• Video - Network Layer (Layer 3) of OSI Networking Model
• Unicast, Multicast, Broadcast. What Does It Mean?
• IPv6 Multicast Addresses
• PoE (Power Over Ethernet)
• Comparison of the Layers of the OSI and TCP/IP Models

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