IPSec (Internet Protocol Security) is the best choice for secure communication over the internet, as it provides encryption, authentication, and data integrity. It is widely used in VPNs and site-to-site secure tunnels.
Breakdown of Options:
A. DCI (Data Center Interconnect) – A general term for linking data centers, but it doesn’t specify a secure tunneling protocol.
B. GRE (Generic Routing Encapsulation) – Encapsulates traffic but lacks encryption, making it less secure than IPSec.
C. VXLAN (Virtual Extensible LAN) – Used for Layer 2 network overlays, not for securing communication over the internet.
D. IPSec – ✅ Correct answer. Provides encryption, authentication, and integrity for data over the internet.
[Reference:, CompTIA Network+ (N10-009) Official Study Guide – Domain 3.5: Implement secure remote access methods., RFC 4301: Security Architecture for the Internet Protocol, , , , , ]
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