By Microsoft Official Academic Course
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Extra resources for 70-642, Package: Windows Server 2008 Network Infrastructure Configuration
A mirrored volume is a fault-tolerant volume consisting of two physical disks, in which the data on one disk is copied exactly onto the second disk. This provides data redundancy, such that if one disk in the mirror fails, the other disk will continue to function without loss of data. • A RAID-5 volume is a fault-tolerant volume where data is interleaved across three or more disks much in the same way as in a striped volume, but with additional information known as parity. If one disk in a RAID-5 volume fails, the data contained on the failed disk can be rebuilt using the parity information stored on the disks in the rest of the volume.
BOOTP, which is still in use today, enables a TCP/IP workstation to retrieve settings for all the configuration parameters it needs to run, including an IP address, a subnet mask, a default gateway, and Domain Name System (DNS) server addresses. Using Trivial File Transfer Protocol (TFTP), a lightweight version of FTP that uses the UDP protocol, a workstation also can download an executable boot file from a BOOTP server. The major drawback of BOOTP is that an administrator still must specify settings for each workstation on the BOOTP server.
DHCP is based heavily on BOOTP, but rather than pushing preconfigured parameters to expected clients, DHCP can dynamically allocate an IP address from a pool of addresses and then reclaim it when it is no longer needed. Because this process is dynamic, no duplicate addresses are assigned by a properly configured DHCP server, and administrators can move computers between subnets without manually configuring them. In addition, a large number of standard configuration and platform-specific parameters can be specified and dynamically delivered to the client.