2.5 - Given a scenario, implement cybersecurity resilience.

Question 1

Redundancy

Question 2

Geographic dispersal

Question 3

Redundant array of independent (or
inexpensive) disks (RAID) levels

Answer 3

-ensure data isn’t corrupted or lost (parity)
-ensures that 1+ disk failures can be handled by an array without losing data
-used multiple disks with data Striped or Mirrored
->striped = spread across disks
->mirrored = completely copied

-combine RAID methods to increase redundancy
->RAID 0+1, RAID 1+0, RAID 5+1, ETC

Question 4

Multipath

Question 5

Load balancers (Network)

Answer 5

-

Question 6

Network interface card (NIC) teaming

Question 7

UPS

Answer 7

Uninterruptible power supply

-SHORT TERM backup power
-EX: blackouts, brownouts, surges

-features;
->auto shutdown
->battery capacity
->outlets
->phone line suppression

-UPS types;
->Offline/Standby UPS
–>Line-interactive UPS
–>On-line/Double-conversion UPS

Question 8

Generator

Question 9

Dual power supply

Answer 9

-provide pwr 4 longer outages
-ensure pwr supply failure won’t disable a server

-Redundancy
–>Internal server pwr supplies
–>External pwr circuits

-Each pwr supply can handle 100% of the load (Would normally run at 50% of the load)

-Hot-swappable
–>Replace a faulty pwr supply without powering down

Question 10

PDUs (Managed power distribution units)

Answer 10

-Provide multiple pwr outlets
–>Usually in a rack

-Often include monitoring and ctrl
->Manage pwr capacity
->Enable/disable individual outlets

Question 11

Storage area network

Question 12

VM

Question 13

On-premises vs. cloud

Question 14

Full (Backup types)

Question 15

Incremental (Backup types)

Question 16

Snapshot (Backup types)

Question 17

Differential (Backup types)

Question 18

Tape (Backup types)

Question 19

Disk (Backup types)

Question 20

Copy (Backup types)

Question 21

Network-attached storage (NAS) (Backup types)

Question 22

Storage area network (Backup types)

Question 23

Cloud (Backup types)

Question 24

Image (Backup types)

Question 25

Online vs. offline (Backup types)

Question 26

Offsite storage (Backup types)

Question 27

Distance considerations (Backup types)

Question 28

Non-persistence

Question 29

Revert to known state (Non-persistence)

Question 30

Last known-good configuration (Non-persistence)

Question 31

Live boot media (Non-persistence)

Question 32

Scalability (High availability)

Question 33

Restoration order

Question 34

Technologies (Diversity)

Question 35

Vendors (Diversity)

Question 36

Crypto (Diversity)

Question 37

Controls (Diversity)

Question 38

Raid 0

Answer 38

-striping without parity -data spread across all devices in the array Advantages -high performance -better I/O performance -all capacity used Disadvantages -no fault tolerance -all data is lost if a drive is lost

Question 39

Striped

Answer 39

-spread across disks

Question 40

Mirrored

Answer 40

-completely copied

Question 41

RAID 1

Answer 41

-mirroring -all data copied exactly to another drive/s Advantages -duplicates data 4 fault tolerance -high speeds from multiple drives -data available if a drive fails Disadvantages -requires twice the disk space

Question 42

RAID 5

Answer 42

-striping with parity -data striped (spread across disks) -one drive used for parity (check sum) of the data -parity spread across drives and data Advantages -fault tolerant -only requires an additional disk 4 redundancy -data reads fast -data writes a little slower -drive failures can be rebuilt as long as only one drive fails Disadvantages -only tolerates a single drive failure at a time -rebuilding arrays after a drive loss can be slow + impact performance

Question 43

RAID 6

Answer 43

-striping with double parity -like RAID 5 BUT additional parity stored on another drive Advantages -like RAID5, BUT allows more than one drive to fail at a time Disadvantages -slower write performance than RAID 5 -rebuilding arrays after drive loss can be slow + impact performance

Question 44

RAID 10

Answer 44

-mirroring and striping -data striped across 2+ drive, then mirrored to same # of drives -sometimes written as 1+0 Advantages -combines advantages disadvantages of RAID 0 and RAID 1 Disadvantages -combines advantages disadvantages of RAID 0 and RAID 1

Question 45

Without parity

Answer 45

-data does not have redundancy or fault tolerance