Microservices Architecture Best Practice

I will be appritiated if anyone answer to below quesions.

1. How a system will be designed with hundreds of services if each and every service has to be independent with a dedicated port as per microservices architecture? i mean is it a good practice to open hundreds of ports on OS for example?

2. How to expose all the services with a single port to customer?

3. Is microservice a perfect solution in such a systems?

Best Regards.