CompTIA A+ Core 2 (220-1202), Domain 4, Objective 4.9 focuses on remote access technologies, and this article drills into the ones built for secure, encrypted connectivity: the Virtual Private Network (VPN), Secure Shell (SSH), and Windows Remote Management (WinRM). Where the previous article was about seeing a remote desktop, this one is about building the encrypted, authenticated channels that carry remote access safely across untrusted networks like the public internet.
You'll learn how each technology tunnels and encrypts traffic, how it authenticates the connecting party, what port and protocol it uses, and what its security posture is. By the end you'll be able to explain why SSH replaced Telnet, when a VPN is the right container for other traffic, and where WinRM fits in a Windows-managed shop.