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LAN Enhancement Components Component Function
*Repeater Resides in the Physical Layer of the OSI model. Regenerates signals for retransmission. Moves packets from one physical media to another. Will pass broadcast storms. Cannot connect different network topologies or access methods.
*Bridge         Resides in the MAC sublayer of the Data Link Layer of the OSI model. Bridges are used to segment networks. They forward packets based on address of destination node. Uses RAM to build a routing table based on source addresses. Will connect dissimilar network topologies. Will forward all protocols. Regenerates the signal at the packet level.
*Remote Bridge Same as bridge, but used for telephone communications. Uses STA (Spanning Tree Algorithm).
*Router     Resides in the Network Layer of the OSI model. Is used to switch and route packets across multiple networks. Uses RAM to build a routing table based on network addresses. Shares status and routing information to other routers to provide better traffic management and bypass slow connections. Will not pass broadcast traffic. Are slower than bridges due to complex functions. Strips off Data Link Layer source and destination addresses and then recreates them for packets. Routers can accomodate multiple active paths between LAN segments.
*Brouter Will act as a router for specified protocols and as a bridge for other specified protocols.
*Gateway Resides in the Transport, Session, Presentation and Application Layers of the OSI model. Used for communications between different network types (i.e. Windows NT and IBM SNA). Takes the packet, strips off the old protocol and repackages it for the receiving network.
*Multiplexer Device that can divide transimissions into two or more channels. Multiplexing - Several signals from different sources are collected into the component and are fed into one cable for transmission.
*Spanning Tree Algortithm - was developed for bridges to determine the most efficient network in path when there are multiple paths to choose from.
 

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MCSE :

Configure and manage user profiles.

User profiles automatically create and maintain the desktop settings for each user's work environment on the local computer. A user profile is created for each user when he or she logs on to a computer for the first time.

More than one user can use the same computer, and each receives desktop settings when he or she logs on.

Customization of the desktop environment made by one user does not affect another user's settings.

A user profile defines customized desktop environments, which include individual display settings, network and printer connections, and other specified settings. You or the system administrator can define your desktop environment.

Types of user profiles include:

Local user profile. A local user profile is created the first time you log on to a computer and is stored on a computer's local hard disk. Any changes made to your local user profile are specific to the computer on which you made the changes.

Roaming user profile. A roaming user profile is created by your system administrator and is stored on a server. This profile is available every time you log on to any computer on the network. Changes made to your roaming user profile are updated on the server.