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Network+ > Disaster Recovery > Flashcards

Disaster Recovery Flashcards

1
Q

RTO

A

Recovery Time Objective

- Period of time system can remain offline after disaster

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2
Q

WRT

A

Work Recovery Time

- Additional work for testing and integration to restore for full business function

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3
Q

MTD

A

Maximum Tolerable Downtime

- Max time a system can be down

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4
Q

RPO

A

Recovery Point Objective

  • The amount of data loss a system can sustain measured in time units
  • For instance, if a database was destroyed RPO of 24 means it can be recovered from not more than 24 hours before hand
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5
Q

MTBF

A

Mean Time Between Failures

  • Life expectancy of product
  • Total operational time divided by number of failures
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6
Q

MTTF

A

Mean Time to Failure

  • Averaged time til a non replaceable component fails
  • Used to calculate needed redundancy necessary
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7
Q

MTTR

A

Mean Time to Repair

  • Measure of time taken to correct a fault
  • Could be time taken to replace or restore as well
  • total number of hours of unplanned maintenance divided by number of failures
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8
Q

PDU

A

Power Distribution Unit

  • “Cleans” a power signal, providing protection from spikes and drops.
  • Integrates with UPS
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9
Q

Multi-pathing

A
  • Network node has more than one physical link to another node
  • Default for full and partial mesh
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10
Q

SAN Multipathing

A
  • Each server has at least two SAN controllers each with a dedicated link to the storage network
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11
Q

Multiple ISPs

A
  • Multiple WAN hookups from different ISPs.
  • Must make sure they are using separate infrastructure
  • Diverse paths of entry increases redundancy
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12
Q

NIC Teaming

A
  • Combining two or more cabled connections to make one logical channel
  • AKA Link Aggregation
  • Also called bonding
  • Provides redundancy so long as the function does not demand full speed of bonded link
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13
Q

Load Balancer

A
  • Distributes server requests over nodes in a farm or pool
  • Layer 4 Switch,
  • Layer 7 Switch (content switch), makes decisions based on content based data. Requires a mode complex processor.
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14
Q

Clustering

A
  • Allows multiple processing nodes that share data

- If one stops working, it fails over to others

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15
Q

Virtual IP

A

Shared or Floating address

  • Public IP is shared between two instances in a cluster
  • Active node owns the IP
  • Fails over automatically based on heartbeat
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16
Q

FHRP

A

First Hop Redundancy Protocol

17
Q

HSRP

A

Hot Standby Router Protocol

  • Allows multiple physical routers to serve as gateway for subnet
  • They share common virtual IP and MAC
  • Choose active router based on priorities set by admin
18
Q

Diverse Pathing

A
  • Provisioning WAN links that are physically separate and distant from each other

Network+ (36 decks)

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