For #3, you are correct. VMS originally required a separate third party product ...

icedchai on June 18, 2019 | parent | context | favorite | on: Lockheed has an opening for engineers with VAX exp...

For #3, you are correct. VMS originally required a separate third party product to support TCP/IP. MultiNet was one of the more popular stacks: http://www.process.com/products/multinet/

Newer releases (6.0 and above, I think?) do have DEC's TCP/IP layered product included. I believe it was called "UCX"...