TAILIEUCHUNG - Ethernet Networking- P9

Ethernet Networking- P9:One of the biggest problems when discussing networking is knowing where to start. The subject of computer networks is one of those areas for which you have to "know everything to do anything." Usually, the easiest way to ease into the topic is to begin with some basic networking terminology and then look at exactly what it means when we use the word Ethernet. | 228 Security Issues How much should you back up If you need to back up everything then you do a full backup. Full backups ensure that the contents of the backup media are complete. Because the backup contains the most recent copy of each file restoring from a full backup is also faster than any other type of restore. On the other hand copying every file to backup media is the slowest type of backup. You therefore might want an incremental backup during which you copy only those files that have been changed since the last backup archival or incremental . Because an incremental backup involves only a subset of the files it can be performed much faster than a full backup. However restoring from incremental backups is more difficult because you must find the most recent copy of each file before restoring it. As files age and sit unused you may decide that you no longer need them online. If you nonetheless need to retain the files for legal or other reasons then you will want to create an archival backup during which you copy the files to some type of removable media and then delete them from online storage. The backup media are then stored in a safe place where they can be accessed if ever needed. How often should a backup be made Perhaps you need a complete archival backup daily or even more frequently or perhaps you need an archival backup once a week with incremental backups done daily. Given that it takes longer to recover from a set of incremental backups than from a single archival backup but that making a complete archival backup takes longer than making incremental backups what is the best mix of archiving and incremental backups for your organization How quickly do you need to be back up and running after a system failure How volatile are your files how quickly do they change How much modified data are you willing to lose Can you make backups while the network and or servers are in use Are there application programs that must be shut down to make backups of .

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