横向
1
Request for information from a database
3
Temporary storage for fast access
4
Device that directs network traffic
6
Portable personal computer
8
Computer model of a real-world system
10
Process of finding and fixing code errors
12
Instructions written for a computer
纵向
2
Point where user interacts with system
5
Rules for data communication
7
Computer that provides services to others
9
Global computer network
11
Wired networking technology