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DB > TDMM Chapter 18 > Flashcards

TDMM Chapter 18 Flashcards

1
Q

Availability

A

Long term average of time that a system is in service

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2
Q

Data Center

A

A building whose primary purpose is to house a computer room and its support system

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3
Q

HDA

A

Horizontal Distribution Area
A space in a computer room whee the horizontal cross connect is located

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4
Q

Information Security

A

The practice of protecting the confidentiality, integrity and availability of data and resources

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5
Q

MDA

A

Main Distribution Area
The space in a main distribution area where the main cross connect is located

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6
Q

Reliability

A

The probability a given system will operate without failure

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7
Q

Redundancy

A

Providing secondary components that work in the event of a failure

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8
Q

Name two advantages if redundancy in a data center

A
  • Increases fault tolerance
  • Increases maintainability
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9
Q

Name two negative consequences of adding redundant components to a data center

A
  • Reduces efficiency
  • Increases losses
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10
Q

What is an N Base requirement?

A

A data center redundancy level indicating no redundancy

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11
Q

What is N+1 redundancy?

A

A data center redundancy level, provides one additional system or path

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12
Q

What is N+2 redundancy?

A

A data center redundancy level, provides to additional systems or paths

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13
Q

What is 2N redundancy?

A

Requires two redundant systems or paths for every one required

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14
Q

What is 2(N+1) redundancy?

A

A redundancy level, provides two complete (N+1) systems or paths

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15
Q

A data center has an N+1 redundancy level, will performing maintenance on two units disrupt operations?

A

Yes, N+1 allows for maintenance of a single unit

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16
Q

A data center has an N+2 redundancy level, will performing maintenance on two units disrupt operations?

A

No, N+2 provides enough protection to prevent disruption

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17
Q

A data center has an N+2 redundancy level, will the failure of an entire unit disrupt operations?

A

No, a 2N redundancy level will provide protection

18
Q

A data center has an N-Base redundancy level, will the failure of one path disrupt operations?

A

Yes, N Base us only the minimum requirements

19
Q

Name four areas of concern that are used to define data center facility availability classes

A
  • Component redundancy
  • system redundancy
  • quality control
  • survivability
20
Q

How does components redundancy increase reliability?

A

By providing redundancy for components

21
Q

How does survivability increase reliability?

A

protects against external events such as nature, security breaches etc

22
Q

What is the objective of availability class F0?

A

To support the basic environmental and energy requirements if the IT functions without supplementary equipment

23
Q

What is the objective of availability class F1?

A

to support the basic environmental and energy requirements if the IT functions

24
Q

What is the objective of availability class F2?

A

To provide a level of reliability higher than that defined in class F1 to reduce the risk of downtime because of component failure

25
Q

which units receive redundancy in a class F2 facility?

A

Critical components

26
Q

What is the objective of availability class F3?

A

To provide additional reliability and maintainability to reduce the risk of downtown due to disaster/maintenance

27
Q

What is the objective of availability class F4?

A

To eliminate downtime redardless

28
Q

Name the two prime requirements of a class F4 facility

A
  • Compartmentalization
  • Fault tolerance
29
Q

What is the targeted availability of a Class F4 facility?

A

99.999 percent

30
Q

What is the separation requirements between twisted pair and electric circuits?

A

2 ft

31
Q

What is the separation requirement between twisted pair and fluorescent lamps?

A

5 in

32
Q

Name three means of properly placing underfloor cabling

A
  • Laying it on a suitably sealed floor
  • Placing it on foam matting
  • Raceway
33
Q

How can additional physical protection be added to cable trays that house telecommunications cabling?

A

Use solid trays or armored cables

34
Q

Name three negative consequences of unmanaged patch cord slack in the data center

A
  • Blocks airflow
  • Slows maintenance
  • Harder to identify
35
Q

How is the loss or destruction of property defined?

A

By value of the property

36
Q

What is the most significant threat to the reliable operation of the data center?

A

Humans

37
Q

What are the four concentric layers for data center physical security?

A
  • Site security
  • Perimeter security
  • Building and access control
  • Computer room security
38
Q

What provides the greatest opportunity to improve energy efficiency?

A

HVAC efficiency

39
Q

When should lighting be on in the data center?

A

Only when work is being performed

40
Q

Name three reasons windows and skylights should be avoided in the computer room

A
  • Security risk
  • Provides minimally useful lighting
  • Creates heat load
41
Q

Where should lighting be installed in a data room?

A

above the isles

DB (19 decks)

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