Chapter 18 - Data Centers Flashcards
ANSI/TIA-569-E, Telecommunications Pathways and Spaces, discusses total maximum pathway fill as ___ percent of the total available pathway cross-sectional area.
a. 40
b. 50
c. 60
d. 65
b. 50
p 18-17
Total maximum pathway fill as 50 percent of the total available pathway cross-sectional area calculated as the sum of the cross-sectional area of every cable within that pathway compared with the available cross-sectional pathway area, with a maximum pathway depth of 150 mm (6 in).
The ANSI/TIA standard for data centers identifies three tiers of distributors for the hierarchical structured cabling system, as follows:
a. Main cross-connect (MC), zone cross-connect (ZC), and horizontal cross-connect (HC)
b. Main cross-connect (MC), intermediate cross-connect (IC), and zone cross-connect (ZC)
c. Main cross-connect (MC), intermediate cross-connect (IC), and horizontal cross-connect (HC)
c. Main cross-connect (MC), intermediate cross-connect (IC), and horizontal cross-connect (HC)
p 18-15
Data center topology from ANSI/TIA-942-B is shown in Figure 18.3
When considering the threat to sensitive or mission-critical data, it is easy to envision ___ as the key threats. The reality is that ___ provide a higher likelihood of catastrophic loss of data.
a. Malicious acts, physical threats
b. Physical threats, malicious acts
a. Malicious acts, physical threats
p 18-25
When considering the threat to sensitive or mission-critical data, it is easy to envision hacking, identity theft, and corporate espionage as the key threats. The reality is that physical threats (e.g., natural disasters, interruption of utilities, equipment failure, weather, human error) provide a higher likelihood of catastrophic loss of data
The data center’s overall class rating is equal to the ___ rating component across all portions of its infrastructure.
a. Lowest
b. Highest
a. Lowest
p 18-4
For example, a data center may be rated class F3 for electrical but class F2 for mechanical. However, the data center’s overall class rating is equal to the lowest rating or weakest component across all portions of its infrastructure.
Availability Class F3 has a targeted availability of ___ %:
a. Less than 99
b. 99
c. 99.99
d. 99.999
c. 99.99
p 18-7
Availability Class F2 has an annual maintenance window of ___ hours
a. more than 400
b. 100 to 400
c. 50 to 99
d. 0 to 49
c. 50 to 99
p 18-7
The ANSI/TIA-942-B minimum standard for category backbone cabling is Cat ___
a. 3
b. 5e
c. 6
d. 6A
a. 3
p 18-11 Table 18.1
For backbone cabling per ANSI/TIA-568.2-D: category 3, 5e, 6, or 6A, with category 6A or 8 recommended
In keeping copper communications cabling properly separated from power distribution is one design approach. One solution to maintain adequate separation
is to place power cabling in the ___ aisles.
a. Hot
b. Cold
b. Cold
p 18-21
One solution to maintain adequate separation is to place telecommunications cabling in the hot aisles and power cabling in the cold aisles. If the power cables are in the cold aisles, the design should avoid impeding air flow through tile perforations.
The maximum optical fiber patch cord pileup within a pathway as no more than ___ in depth.
a. 1
b. 2
c. 4
d. 6
b. 2
p 18-17
The maximum optical fiber patch cord pileup within a pathway as no more than 50 mm (2 in) depth, regardless of the size of each individual optical fiber patch cord or available pathway cross-sectional area.
In the data center environment, the separation between balanced twisted-pair cable and power distribution in pathways is generally ___ ft separation.
a. 1
b. 2
c. 3
d. 4
b. 2
p 18-17
The requirement is generally ≈600 mm (2 ft) separation for large quantities of electrical branch circuits or any number of electrical feeder circuits.
Additionally, ≈12.5 mm (5 in) separation is required between balanced twisted-pair cables and fluorescent lamps and associated fixtures.
Also see p 2-38 Table 2.7. Same specs
The most frequently benchmarked performance metric for data centers is the amount of delay when accessing stored data or processing capabilities.
a. True
b. False
b. False
p 18-24
The most frequently benchmarked performance metric for data centers is the percentage of time with total access to stored data or processed capabilities.
Within equipment racks and cabinets, the planned capacity of the cable management should be ___ percent by cross-sectional area of the cables.
a. 40
b. 50
c. 60
d. 65
a. 40
p 18-37
The planned capacity of the cable management should be 40 percent by cross-sectional area of the cables. Routing of cabling and the cabinet should not block
airflow into and out of the equipment and should provide adequate access for servicing equipment, including replacement of hot-swappable components (e.g., line cards, fan trays).
___ is the long-term average of time that a system is in service and is satisfactorily performing its intended function.
a. Mean time to failure
b. Fault tolerance
c. Reliability
d. Availability
d. Availability
p 18-28
___ focuses on the probability that a given system will operate properly without failure for a given period of time.
a. Mean time to failure
b. Fault tolerance
c. Reliability
d. Availability
c. Reliability
p 18-28
Data center telecommunications spaces include the equipment room.
a. True
b. False
b. False
p 18-9
Data center telecommunications spaces include the: • Building entrance facility • Main distribution area (MDA) • Intermediate distribution area (IDA) • Horizontal distribution area (HDA) • Zone distribution area (ZDA) • Equipment distribution area (EDA)
