| Desktop (user hardware, applications, etc.) | 1 2 3 4 5 |
| Network (NOSs) | 1 2 3 4 5 |
| Mid-range (minicomputers, host software, etc.) | 1 2 3 4 5 |
| Mainframe (mainframes, host software, etc.) | 1 2 3 4 5 |
| Infrastructure (backbones, switches, etc.) | 1 2 3 4 5 |
| WAN (leased lines, frame relay, etc.) | 1 2 3 4 5 |
| Remote access (servers, modems, ISDN, etc.) |
1
2
3
4
5
|
| Internet |
1
2
3
4
5
|
| Intranet |
1
2
3
4
5
|
| Computer telephone integration |
1
2
3
4
5
|
| Voice/data recognition |
1
2
3
4
5
|
| Video conferencing |
1
2
3
4
5
|
| CATV |
1
2
3
4
5
|
| Network security |
1
2
3
4
5
|