VPNs & Tunneling

Encapsulating traffic inside another protocol to create a private, often encrypted path across an untrusted network.

Read

45 min

Practice MCQs

25

Interview QA

25

Edition

v4

Editorial status

Reviewed

Relevant for

Network Engineer

Scope: Current IETF IPsec/IKEv2/NAT-T/GRE/L3VPN/VXLAN/PMTUD/UDP, NIST IPsec, WireGuard, OpenVPN 2.6, and TLS 1.3 references reviewed 2026-09-04.