No the reason it's called a primary Domain Controller is because it's the one controller that has all the domain names and address for that Domain.
yes
There is no practical limit
There are many websites where you only pay about $3 a year for a domain website! These domains sites have different packages you can buy for more or less protection for your domain.
Hubs are not collision domains but a networking device. Hubs have single collision domain that makes them very undesirable for modern networks.
The domain controller is only of one type but it can have different roles Domain Naming master RID master PDC Schema Master Infrastructure master Schema master (forest wide): The Schema Master controls all updates to the Schema within the forest. Domain Naming Master (forest wide): The Domain Naming Master role is responsible for the creation and deletion of domains in the forest. PDC Emulator (domain wide): The PDC emulator role provides backwards compatability for Windows NT backup domain controllers (BDCs), the PDC emulator advertises itself as the primary domain controller for the domain. It also acts as the domain master browser and maintains the latest password for all users within the domain. Infrastructure Master (domain wide): The Infrastructure Manager role is responsible for updating references from objects within its domain with objects in other domains. RID Master (domain wide): The RID Master manages the Security Identifier (SID) for every object within the
One, you may join other member servers but you may only have one domain controller.
Google has various domains for the various countries in the world. However, within those domains, there are also subdomains for many of Google's products and services.
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There are many cheap domain resellers. Among them are Register, Network Solutions, Maddog Domains, Name Cheap, Resell, Go Daddy, Domain Box., and Reseller Club.
There are many places where you can purchase an internet domain. One of the most reputable places is Godaddy.com. It is one of the leaders in the domain market.
One can purchase cheap DNS domains from many websites, such as 'Name Cheap', 'My Domain', 'UK Daddy' and 'DNY'. The costs of the domain name can vary depending on the chosen domain and website in which one purchase from.