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Make sure that you have installed antivirus software on all servers and desktop systems You will also need to schedule a virus scan on the systems regularly and to update the virus de nitions often The virus de nitions a list all the known viruses at the time the virus de nition le was created You will most likely want to load antispyware software on computers on which users spend a lot of time sur ng the Internet Spyware and adware are malicious programs that can be installed on your system without your knowledge This malicious software is a security risk because it can monitor your activity, and it can dramatically slow system performance It is extremely critical that you back up data regularly You should back up data provided by all services, including le and print services, database servers, and email services Further, you should make sure that you perform a backup of the operating system so that you can get it up and running quickly when presented with a system failure There are three major types of backups a full backup, an incremental backup, and a differential backup A full backup backs up any le that you select, whether the archive bit is set or not, and then clears the archive bit An incremental backup only backs up a le that has the archive bit set, and also clears the archive bit when it is done A differential backup backs up any les that have the archive bit set and does not clear the archive bit when it is done When restoring from an incremental backup, you will need to restore the last full backup and then each incremental since the last full backup When restoring from a differential backup, you will need to restore the last full backup and then the last differential If you perform full backups every night, you will need to restore only the last full backup Fault tolerance is the concept of trying to keep things running when there is a failure in a device In this chapter we looked at disk fault tolerance and how to set up your server so that if a disk fails you can still have the server running To implement disk fault tolerance we implement a level of RAID RAID level 0 is known as striping When a users saves a le to a RAID 0 volume, the le is split across all drives in the RAID 0 volume, which increases performance because you have multiple drives taking care of the save operation at the same time There is no fault tolerance with RAID level 0 RAID level 1 is known as disk mirroring Disk mirroring is responsible for duplicating all the data that is saved to the RAID 1 volume to the two drives that are mirrored RAID level 5 stripes the data as RAID 0 does, but there is data redundancy, or parity information, stored with the data as well If a drive fails in a RAID 5 volume, the system continues to run, reading the data from the RAID 5 volume
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Be sure to do an inventory on all your servers and verify that you have
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the most up-to-date ROMs on the device Check for updates on the manufacturer s web site for the device
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Installing Patches and Updates
Be sure to keep your systems up to date with patches and service packs
Most vulnerabilities are xed with a software patch
A hot- x is something that can t wait for the next service pack release
You should test and then apply any hot- x as soon as possible
A service pack includes all updates since the release of the product If you
install a server and service pack 2 is the current service pack, you will not need to install service pack 1 and service pack 2 just service pack 2 You will need to get any updates released since service pack 2 in this example
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