Layer 2 Tunneling Protocol (L2TP)
What is Layer 2 Tunneling Protocol (L2TP)?
Layer 2 Tunneling Protocol, or L2TP, is a tunneling protocol used to carry network traffic through an encrypted or protected connection, most commonly as part of VPN solutions.
Examples
- A remote employee connects to the company network through an L2TP-based VPN so traffic can travel through a tunnel across the internet.
- An organization uses L2TP together with IPsec to provide secure remote access for staff working outside the office.
Discover 🔎
Sometimes the challenge in networking is not just sending traffic from one place to another. The real challenge is making that traffic behave as if it were moving through a private path even when it is actually crossing a public or untrusted network. That is the idea behind tunneling protocols such as L2TP.
L2TP matters because it helps create those logical paths. It gives systems a way to wrap traffic and carry it through another network so the connection can function like a private link. On its own, that is useful for remote access and network connectivity. In security, however, the most important lesson is that tunneling and encryption are not the same thing, which is why L2TP is often discussed together with IPsec rather than treated as a complete security solution by itself.
Summary 📝
L2TP is a tunneling protocol used to carry network traffic through a virtual path, especially in VPN scenarios. Its main role is transport rather than encryption, which is why it is commonly paired with IPsec for stronger security. The most important lesson is that a tunnel helps move traffic, but the real confidentiality and integrity protections usually come from the protocols wrapped around it.
Tip: The interactive version includes progress tracking, decks, and premium deep dives.