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📘 How VPNs Work

A laptop on coffee-shop Wi-Fi normally sends an IP packet toward the destination chosen by its routing table.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. The packet gets a wrapperExplain tunneling, encapsulation, and split versus full tunnel routing.A VPN wraps selected IP traffic in an outer packet and sends it to a gateway according to route policy.
  2. Keys before cargoDescribe VPN negotiation, encryption, integrity, and protocol choices.IKEv2 and related protocols establish shared protection state before encrypted packets travel through the tunnel.
  3. The gateway becomes the exitExplain exit nodes, visible addresses, tunnel limits, and one end-to-end request path.The gateway resumes ordinary routing after decapsulation, which changes the visible source while leaving clear trust boundaries.

Questions this course answers

What is the original IP packet called after a VPN wraps it inside a new outer packet?

The original packet becomes the inner payload while a new outer packet carries it to the VPN endpoint.

Put this VPN packet journey in order.

A route selects the traffic, the client protects and sends it, and the gateway unwraps it before forwarding.

What is the main job of IKEv2 in a common IPsec VPN?

IKEv2 authenticates peers and negotiates the state and algorithms used for later protected traffic.

Match each VPN term to its role.

These terms name different parts of the VPN mechanism rather than synonyms for privacy.

Why does a website often see a VPN gateway's public address?

The gateway is the exit node: it forwards or creates the onward traffic using its own network route.

Why does a VPN not automatically make every part of a user's online activity private?

The tunnel has a defined path and endpoint; protections do not automatically continue beyond that boundary.

Grounded in trusted sources

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