2.4 Explain important factors of physical installations

What is MDF?

MDF (Main Distribution Frame) is the central point of the network. This usually involves a room to where you’d terminate WAN connections and see punch down blocks.

What is IDF?

IDF (Intermediate Distribution Frame) is essentially an extension of the MDF. This is common in medium or large organizations to where a different floor of the building may have their own networking equipment that uplinks to the MDF.

What is the average width of a rack?

19 inches

What is the average height of a rack unit?

1.75 inches

True or False. Amperage (amps) is measured by pressure.

False. Amperage (amps) is measured by the flow rate. An example would be how much water is flowing through a garden hose.

How is Volts measured?

Volts are measured by pressure. An example of this would be how open a faucet is for a garden hose. The more you open it, the more pressure you get.

True or False. Wattage is measured by how much energy is being consumed.

True.

Match the voltage to the region:

Region:
US/Canada
Europe

Volts:
110 to 120
220 to 240

US/Canada: 110 to 220
Europe: 220 to 240

What is a PDU?

A PDU (Power Distribution Unit) is a common device found on a rack. It supplies multiple different outlets for devices to get power from on the rack.

What is the difference between a offline UPS, a line-interactive UPS and a on-line UPS

Offline UPS: This is usually the cheapest option for UPS. This UPS waits for the power to go out before kicking on to give power to devices still until power is restored.

Line-Interactive UPS: If a brownout happens and device begin to lose wattage and/or voltage, this UPS will supply the devices with power to ensure they stay on until the brownout is restored.

On-line UPS: Most datacenters prefer these because the power is coming from the battery power itself. The battery power is constantly being refreshed from the main power. So, if the main power goes out, it doesn’t affect your system as it’s still running off battery power.