Chapter 18 Flashcards by M J

Availability

The long-term average of time
that a system is in service and is
satisfactorily performing its
intended function.
TDMM.* Page 18-28

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Data Center

A building or portion of a
building whose primary function
is to house a computer room
and its support systems.
TDMM.* Page 18-1

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HDA

Horizontal Distribution Area
A space in a computer room where a horizontal cross-connect HC is
located and may include LAN switches, storage area network (SAN) switches, and keyboard/video/mouse (KVM) switches for the end equipment located in the equipment distribution areas.
TDMM.* Page G-93

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Information Security

The practice of protecting the
confidentiality, integrity, and
availability of data
and resources.
TDMM.* Page 18-24

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MDA

Main Distribution Area
The space in an equipment
room where the main cross-
connect is located.
TDMM.* Page G-115

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“N”

Need
Symbol used to represent “the
need” for redundancy in a
particular system.
TDMM.* Page 18-5

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Reliability

The probability that a given
system will operate properly
without failure for a
given period of time.
TDMM.* Page 18-28

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Redundancy

Providing secondary
components that either become
instantly operational or are
continuously operational so that
the failure of a primary
component will not result in
mission failure.
TDMM.* Page G-761

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Name 2 advantages of
redundancy in a
data center.

1.lncreases fault tolerance
2.Increases maintainability
TDMM.* Page 18-4

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Name 2 negative
consequences of adding
redundant components in
case of failures.

Reduces efficiency
2.Increases losses
TDMM.* Page 18-4

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What is an N-Base

A data center redundancy level
indicating that the system meets
base requirements and has
no redundancy
TDMM.* Page 18-5

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What is N+1 redundancy?

A data center redundancy level
that provides one additional unit,
module, path, or system in
addition to the minimum
required to satisfy the
base requirement
TDMM.* Page 18-5

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What is N+2 redundancy?

A data center redundancy level
that provides two additional
units, modules, paths, or
systems in addition to the
minimum required to satisfy
the base requirement
TDMM.* Page 18-5

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What is 2N redundancy?

A data center redundancy level
that provides two complete
units, modules, paths, or
systems for each one required
for a base system
TDMM.* Page 18-5

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What is 2(N+1)
redundancy?

A data center redundancy level
that provides two complete
(N+1) units, modules, paths,
or systems
TDMM.* Page 18-5

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A data center has an N+l
redundancy level. Will
performing maintenance
on two units disrupt
operations?

Yes, an N+l redundancy level
allows for maintenance of a
single unit without disruption.
Therefore, performing
maintenance on two unit will
disrupt the system.
TDMM: Page 18-5

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A data center has an N+2
redundancy level. Will the
failure of two modules
disrupt operations?

No, an N+2 redundancy level will
provide enough protection to
prevent disruption of operations.
TDMM.* Page 18-5

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A data center has a 2N
redundancy level. Will the
failure of an entire unit
disrupt operations?

No, a 2N redundancy level will
provide enough protection to
prevent disruption of operations.
TDMM.* Page 18-5

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A data center has an N-
Base requirement. Will the
failure of one path
disrupt operations?

Yes, the N-Base requirement
means that the system has no
redundancy, and the failure of
one path will disrupt operations.
TDMM.* Page 18-5

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Name 4 areas of concern
that are used to define
data center facility
availability classes.

1 .Component redundancy
2.System redundancy
3.Quality control
4.Survivability
TDMM.* Page 18-5

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How does component
redundancy increase
reliability?

By providing redundancy for
critical high-risk, low-reliability
components within systems
TDMM.* Page 18-5

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How does survivability
increase reliability?

Protects against external events
such as physical forces, security
breaches, and natural disasters
TDMM.* Page 18-5

What is the objective of
availability class FO?

To support the basic
environmental and energy
requirements of the IT
functions without
supplementary equipment
TDMM.* Page 18-5

What is the objective of
availability class F1 ?

To support the basic
environmental and energy
requirements of the IT functions
TDMM.* Page 18-6

What is the objective of availability class F2?

To provide a level of reliability higher than that defined in class F1 to reduce the risk of downtime because of component failure TDMM.* Page 18-6

Which units receive redundancy in a class F2 facility?

Critical components TDMM.* Page 18-7

What is the objective of availability class F3?

To provide additional reliability and maintainability to reduce the risk of downtime because of natural disasters, human-driven disasters, planned maintenance, and repair activities TDMM.* Page 18-7

What is the objective of availability class F4?

To eliminate downtime through the application of all tactics to provide continuous operation regardless of planned or unplanned activities TDMM.* Page 18-8

Name two prime requirements for a class F4 facility.

1 . Compartmentalization 2. Fault tolerance TDMM.* Page 18-8

What is the targeted availability of a class F4 facility?

99.999 percent TDMM.* Page 18-8

What is the separation requirement between balanced twisted-pair cables and electrical branch circuits?

=600 mm (2 ft) TDMM: Page 18-17

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

-12.5 mm (5 in) TDMM: Page 18-17

Name 3 means of properly placing underfloor cabling.

1 .Laying it on a suitably sealed floor 2.Placing it on foam matting 3.Housing it in a basket raceway TDMM: Page 18-22

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

Use solid trays or armored cables. TDMM.* Page 18-22

Name 3 negative consequences of unmanaged patch cord slack in the data center.

1 .Significantly impedes or blocks air flow, increasing temperatures 2.Increases the time required to maintain or change equipment configurations in racks 3.Increases time to identify and replace poor or non-functioning cable TDMM.* Page 18-23

Name 5 factors that determine the type and amount of patch cord slack management used in a data center.

1 .Specific configuration of cabinets and racks 2.Use of overhead or underfloor cabling 3.Location of air intake and outlets for the equipment 4.Type of cabling media being used 5.Style of equipment panel in use TDMM.* Page 18-23

How is the loss or destruction of property typically defined?

By the value of the property and the cost associated with replacing that property TDMM.* Page 18-24

Name the 7 classes of potential for damage or loss.

1. Temperature 2. Gases 3. Liquids 4. Organisms 5. Projectiles 6. Movement 7. Energy anomalies TDMM: Page 18-25

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

Human beings TDMM.* Page 18-25

What are the 4 concentric layers for data center physical security?

1 .Site security 2.Perimeter security 3.Building and access control 4.Computer room security TDMM.* Page 18-26, Figure 18.8

Name 5 security factors that affect the selection of a potential site for a data center.

1 .Crime 2.Emergency services 3. Telecommunications 4.UtiIities 5.NaturaI disasters TDMM.* Page 18-26

Name 4 benefits of using security perimeter measures.

1 .Delay to allow alarms or other detection systems to activate 2.Evidence of an intrusion or an intrusion attempt 3.PhysioIogical discouragement 4.Mitigates damage from the threat TDMM: Page 18-27

Name the 3 primary factors used to identify and authenticate a user's identity.

1 .Something a person knows (e.g., password) 2.Something a person has (e.g., keys) 3.Something a person is (e.g., biometrics) TDMM: Page 18-27

What is an additional, optional authentication factor that a data center can use to control access?

Something a person does TDMM.* Page 18-27

Name the 4 categories of security spaces as defined by the practice of crime prevention through environmental engineering.

1 .Public space 2.Semipublic space 3.Semiprivate space 4.private space TDMM.* Page 18-27

Why should a designer ensure that a kitchenette is NOT adjacent to the computer room?

If pipes in the kitchenette leak, the water could spill into the computer room. TDMM.* Page 18-28

If an existing computer room has a door on its outside wall, what security measures should be considered?

*Traditional alarm sensors *Physical barriers such as bars and plates TDMM.* Page 18-29

How much overpressure is required to shatter tempered safety glass?

5.5 kilopascals (0.8 pounds per square inch) TDMM: Page 18-29

What provides the greatest opportunity to improve energy efficiency?

HVAC efficiency TDMM.* Page 18-30

When should lighting be on in the data center?

Only when work is being performed TDMM.* Page 18-30

Name 3 reasons windows and skylights should be avoided in a computer room.

1 .Create potential security risk 2.Provide minimal useful lighting 3.Create a heat load, resulting in more energy loss than energy savings TDMM.* Page 18-30

How should you determine how much capacity is required for the data center's cabling containment system?

You will need to determine how much capacity will be adequate for the cabling requirements of the data center when it is fully built-out and occupied. TDMM.* Page 18-36

What component can be installed in an empty space in a cabinet or rack to support the hot and cold aisle strategy?

Blanking panels TDMM.* Page 18-37

Where should lighting be installed in the data center?

Above the aisles TDMM.* Page 18-37