Drag and Drop Questions 1

September 10th, 2011 in CCDA 640-864

Here you will find answers to Drag and Drop Questions – Part 1

Question 1

Drag the data center property on the left to the design aspect on the right it is most apt to affect

data_center_property.jpg


Answer:

Space: amount of racks, equipment, cabling, people
Weight load: rack servers vs blade servers
Power: variability of computing load, computing power and memory requirements
Cooling: arranging equipment racks face-to-face or back-to-back
Cabling: abundant, variable, well organized and easy to maintain
Security: disasters, fire suppression and alarm systems

Explanation

The data center space includes number of racks for equipment that will be installed. Other factor needs to be considered is the number of employees who will work in that data center.

Rack servers are low cost and provide high performance, unfortunately they take up space and consume a lot of energy to operate. Blade servers provide similar computing power when compared to rack mount servers, but require less space, power, and cabling. The chassis in most blade servers allows for shared power, Ethernet LAN, and Fibre Channel SAN connections, which reduce the number of cables needed.

The power in the data center facility is used to power cooling devices, servers, storage equipment, the network, and some lighting equipment. In server environments, the power usage depends on the computing load place on the server. For example, if the server needs to work harder by processing more data, it has to draw more AC power from the power supply, which in turn creates more heat that needs to be cooled down.

Cooling is used to control the temperature and humidity of the devices. The cabinets and racks should be arranged in the data center with an alternating pattern of “cold” and “hot” aisles. The cold aisle should have equipment arranged face to face, and the hot aisle should have equipment arranged back to back. In the cold aisle, there should be perforated floor tiles drawing cold air from the floor into the face of the equipment. This cold air passes through the equipment and flushes out the back into the hot aisle. The hot aisle does not have any perforated tiles, and this design prevents the hot air from mixing with the cold air.

The cabling in the data center is known as the passive infrastructure. Data center teams rely on a structured and well-organized cabling plant. It is important for cabling to be easy to maintain, abundant and capable of supporting various media types and requirements for proper data center operations.

Fire suppression and alarm systems are considered physical security and should be in place to protect equipment and data from natural disasters and theft.

(Reference: CCDA 640-864 Official Cert Guide)

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