Windows has very sophisticated firewalling and network access can be filtered on a per-process, per-network basis.
Restrictive companies will only allow pre-approved applications, for specific ports, like I.E. doing HTTP/S over ports 80 and 443, and only on approved/trusted networks.
Restrictive companies will only allow pre-approved applications, for specific ports, like I.E. doing HTTP/S over ports 80 and 443, and only on approved/trusted networks.