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Packet Switching Networks Packet Switching - Packets are relayed across network along the best route available.
Repeater = Physical layer - takes a weak signal and regenerates it - doesn't translate or filter anything - can move packets from on physical media to another (i.e. can connect thinet to fiber-optic) - they are cheap - will pass a broadcast storm
Bridge = Data Link layer - does everything a repeater does - reduce traffic by segmenting the network by using a routing table- regenerate the signal at the packet level - not suited to WANs slower than 56K - will pass broadcast storms - read the source and destination of every packet - pass packet with unknown destinations - connect dissimilar networks (i.e. Token Ring and Ethernet)
Router = Network layer - does filtering and isolating traffic - forwards particular protocols to particular addresses (other routers) - connect network segments - not all protocols are routeable (LAT and NetBEUI) - are used in complex network situations because they provide better traffic mgmt. than brides - don't pass broadcast traffic.
Brouter = combines best qualities of both a bridge and a Router - can act like a Router for one protocol and bridge all of the others (nonroutable) - delivers more cost-effective
 

 
 

 

 

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MCSE : Security Specialist

Implement, configure, manage, and troubleshoot user rights.

Administrators can assign specific rights to group accounts or to individual user accounts. These rights authorize users to perform specific actions, such as logging on to a system interactively or backing up files and directories. User rights are different from permissions because user rights apply to user accounts, and permissions are attached to objects.

User rights define capabilities at the local level. Although user rights can apply to individual user accounts, user rights are best administered on a group account basis. This ensures that a user logging on as a member of a group automatically inherits the rights associated with that group. By assigning user rights to groups rather than individual users, you simplify the task of user account administration. When users in a group all require the same user rights, you can assign the set of user rights once to the group, rather than repeatedly assigning the same set of user rights to each individual user account.

User rights that are assigned to a group are applied to all members of the group while they remain members. If a user is a member of multiple groups, the user's rights are cumulative, which means that the user has more than one set of rights. The only time that rights assigned to one group might conflict with those assigned to another is in the case of certain logon rights. In general, however, user rights assigned to one group do not conflict with the rights assigned to another group. To remove rights from a user, the administrator simply removes the user from the group. In this case, the user no longer has the rights assigned to that group. There are two types of user rights: privileges and logon rights.

Privilege. An example of a privilege is the right to back up files and directories. (Some privileges can override permissions set on an object.)

Logon right. An example of a logon right is the right to log on to a system locally.

The special user account LocalSystem has almost all privileges and logon rights assigned to it, because all processes that are running as part of the operating system are associated with this account, and these processes require a complete set of user rights.