Computer networking can be used to make money in several ways. Here are some examples:

1. Network infrastructure development: Companies that develop network infrastructure, such as routers, switches, and firewalls, can make a profit by selling their products to other businesses or consumers.

2. Network consulting: Companies that specialize in network consulting can make a profit by providing networking solutions and services to other businesses. This can include designing and implementing networks, providing network security solutions, and troubleshooting network issues.

3. Network administration: Companies that provide network administration services can make a profit by managing and maintaining the networks of other businesses. This can include managing user accounts and permissions, monitoring network performance, and troubleshooting network issues.

4. Network security: Companies that specialize in network security can make a profit by providing security solutions to other businesses. This can include setting up firewalls, implementing intrusion detection systems, and conducting vulnerability assessments.

5. Internet service provider (ISP): ISPs can make a profit by providing internet connectivity to other businesses and consumers. This can include providing broadband internet access, web hosting services, and email services.

These are just a few examples of how computer networking can be used to earn money. The key is to identify the specific application and use the appropriate networking tools and skills to solve the problem at hand.