Encrypting confidential data stored on the server and performing regular backup will not make the server fault
tolerant.
Fault tolerance is the ability to continue work when a hardware failure occurs on a system. A fault-tolerant
system is designed from the ground up for reliability by building multiples of all critical components, such as
CPUs, memories, disks and power supplies into the same computer. In the event one component fails, another
takes over without skipping a beat.
Answer options A, C, and D are incorrect. The following steps will make the server fault tolerant:
Adding a second power supply unit
Adding one more same sized disk as a mirror on the server implementing cluster servers facility

The 802.11e standard is a proposed enhancement to the 802.11a and 802.11b wireless LAN (WLAN)
specifications. It offers quality of service (QoS) features, including the prioritization of data, voice, and video
transmissions. 802.11e enhances the 802.11 Media Access Control layer (MAC layer) with a coordinated time
division multiple access (TDMA) construct, and adds error-correcting mechanisms for delay-sensitive
applications such as voice and video. Answer option D is incorrect. 802.11h refers to the amendment added to
the IEEE 802.11 standard for Spectrum and Transmit Power Management Extensions.
Answer option B is incorrect. 802.11n is an amendment to the IEEE 802.11-2007 wireless networking standard
to improve network throughput over the two previous standards - 802.11a and 802.11g - with a significant
increase in the maximum raw data rate from 54 Mbit/s to 600 Mbit/s with the use of four spatial streams at a
channel width of 40 MHz. Answer option A is incorrect. IEEE 802.15 is a working group of the IEEE 802 and
specializes in Wireless PAN (Personal Area Network) standards. It includes seven task groups, which are as
follows:
1.Task group 1 (WPAN/Bluetooth)
2.Task group 2 (Coexistence)
3.Task group 3 (High Rate WPAN)
4.Task group 4 (Low Rate WPAN)
5.Task group 5 (Mesh Networking)
6.Task Group 6 (BAN)
7.Task group 7 (VLC)