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A suite of protocols for ensuring private, secure communications over IP networks through the use of cryptographic security services. Implementation scenario: Used to establish a secure connection between remote office networks.

Provides secure remote access to web applications and services through a web browser, without the need for client software. Implementation scenario: Used to grant remote users secure access to internal network services.

An open-source VPN protocol that uses SSL/TLS for key exchange. It is capable of traversing network address translators (NATs) and firewalls. Implementation scenario: Suitable for creating secure point-to-point or site-to-site connections.

A tunneling protocol used to support VPNs. L2TP does not provide encryption or confidentiality by itself and is often combined with IPSec. Implementation scenario: Commonly used to provide VPN connectivity for mobile devices.

An obsolete method for implementing VPNs, with many known security issues, but is easy to set up. Implementation scenario: An older VPN solution, typically replaced by more secure protocols but can still be found in legacy systems.

A form of VPN tunnel that provides a mechanism to transport PPP traffic through an SSL/TLS channel. Implementation scenario: Utilized to enable remote users to access corporate networks securely, typically on Windows platforms.

A newer, simpler, and faster VPN protocol that utilizes state-of-the-art cryptography. Implementation scenario: Ideal for both small-scale personal use and large-scale corporate VPNs for its performance and simplicity.

A protocol used to setup a security association (SA) within IPSec and to manage VPN negotiation. It excels in re-establishing broken connections. Implementation scenario: Commonly used in mobile VPN applications due to its mobility and multi-homing capabilities.

A data-carrying technique that directs data from one node to the next based on short path labels rather than long network addresses. Implementation scenario: Often used by service providers to create VPNs over optimized network paths.

A dynamic tunneling form of a VPN that supports multiple connections from sites in a mesh topology. Implementation scenario: Particularly useful in situations where intermittent connections between network sites are expected.

A simple, universal, packet encapsulation protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links. Implementation scenario: Often used to encapsulate packets for tunneling them over an IP network.

A security concept where trust is never implied by default and network access is granted on a per-session basis. Implementation scenario: Used to implement granular, identity-driven access control within corporate networks.

VPN services that are delivered from cloud infrastructure and typically offer scalable, on-demand VPN connectivity. Implementation scenario: Ideal for businesses that require flexible and scalable remote access without on-premises hardware.

A network setup where users are presented with a web page requiring action before network access is granted, often implemented alongside a VPN for guest access. Implementation scenario: Frequently used in hotels, cafes, and public spaces to regulate Wi-Fi access.