TDMM Chapter 18 Flashcards
Availability
Long term average of time that a system is in service
Data Center
A building whose primary purpose is to house a computer room and its support system
HDA
Horizontal Distribution Area
A space in a computer room whee the horizontal cross connect is located
Information Security
The practice of protecting the confidentiality, integrity and availability of data and resources
MDA
Main Distribution Area
The space in a main distribution area where the main cross connect is located
Reliability
The probability a given system will operate without failure
Redundancy
Providing secondary components that work in the event of a failure
Name two advantages if redundancy in a data center
- Increases fault tolerance
- Increases maintainability
Name two negative consequences of adding redundant components to a data center
- Reduces efficiency
- Increases losses
What is an N Base requirement?
A data center redundancy level indicating no redundancy
What is N+1 redundancy?
A data center redundancy level, provides one additional system or path
What is N+2 redundancy?
A data center redundancy level, provides to additional systems or paths
What is 2N redundancy?
Requires two redundant systems or paths for every one required
What is 2(N+1) redundancy?
A redundancy level, provides two complete (N+1) systems or paths
A data center has an N+1 redundancy level, will performing maintenance on two units disrupt operations?
Yes, N+1 allows for maintenance of a single unit
A data center has an N+2 redundancy level, will performing maintenance on two units disrupt operations?
No, N+2 provides enough protection to prevent disruption
A data center has an N+2 redundancy level, will the failure of an entire unit disrupt operations?
No, a 2N redundancy level will provide protection
A data center has an N-Base redundancy level, will the failure of one path disrupt operations?
Yes, N Base us only the minimum requirements
Name four areas of concern that are used to define data center facility availability classes
- Component redundancy
- system redundancy
- quality control
- survivability
How does components redundancy increase reliability?
By providing redundancy for components
How does survivability increase reliability?
protects against external events such as nature, security breaches etc
What is the objective of availability class F0?
To support the basic environmental and energy requirements if the IT functions without supplementary equipment
What is the objective of availability class F1?
to support the basic environmental and energy requirements if the IT functions
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
which units receive redundancy in a class F2 facility?
Critical components
What is the objective of availability class F3?
To provide additional reliability and maintainability to reduce the risk of downtown due to disaster/maintenance
What is the objective of availability class F4?
To eliminate downtime redardless
Name the two prime requirements of a class F4 facility
- Compartmentalization
- Fault tolerance
What is the targeted availability of a Class F4 facility?
99.999 percent
What is the separation requirements between twisted pair and electric circuits?
2 ft
What is the separation requirement between twisted pair and fluorescent lamps?
5 in
Name three means of properly placing underfloor cabling
- Laying it on a suitably sealed floor
- Placing it on foam matting
- Raceway
How can additional physical protection be added to cable trays that house telecommunications cabling?
Use solid trays or armored cables
Name three negative consequences of unmanaged patch cord slack in the data center
- Blocks airflow
- Slows maintenance
- Harder to identify
How is the loss or destruction of property defined?
By value of the property
What is the most significant threat to the reliable operation of the data center?
Humans
What are the four concentric layers for data center physical security?
- Site security
- Perimeter security
- Building and access control
- Computer room security
What provides the greatest opportunity to improve energy efficiency?
HVAC efficiency
When should lighting be on in the data center?
Only when work is being performed
Name three reasons windows and skylights should be avoided in the computer room
- Security risk
- Provides minimally useful lighting
- Creates heat load
Where should lighting be installed in a data room?
above the isles
