计算机网络系列（12）之应用场景Server rooms

1. Server rooms
The objective of a server room is to providing very stable physical environments for server machines and network equipment so that they can be smoothly run on 24*7 basis to provide continuous services.

1.1. Temperature control
good air-conditioning

1.2. Fire control
sensors to detect fire/smoke

1.3. Water control
waterproof

1.4. Electricity control
two independent sources of electricity supply
UPS (uninterruptible power supply

1.5. Access control
only the authorized persons can enter the server room

2. Data center
A data center can be considered to be a large-scale server
room.

3. Cloud computing
In cloud computing, IT functions are provided as a service to external users using Internet technologies. Typically a cloud diagram represents a black box. This black box contains hardware and software, but it does not show the internal details.

4. Questions
Q1: Among the five types of control for server rooms, which one is relatively important?
Temperature control/Fire control/Water control/Electricity control/Access control

Q2: Discuss the advantages and disadvantages of cloud
computing.
Advantages: convenient service
Disadvantages: costly for a cloud establishment

5. 总结
重点1：温，火，水，电，人控，保证机房的安全

重点2：云服务