What are John’s permissions with NTFS ?

Scenario:
Folder x has the following permissions set:
Sales = NTFS – Read
Managers = NTFS – Modify
Users = Share – Full Control
John is a member of Sales, Managers and Users. Based on the permissions that are set what will John’s effective permissions be when he access the folder over a network? Will the permissions change any if he can log on locally to the system where the folder is stored?
My Answer is John will be able to access the computer over the network based on the NTFS permissions specifically, Managers because NTFS permissions are cumulative and his effective permission will be Modify.
If John logs on to the computer locally his effective permissions will be Full Control.
Is this correct??