A network design engineer is planning the implementation of a cost-effective method to interconnect multiple networks securely over the internet. Which type of technology is required?

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A network design engineer is planning the implementation of a cost-effective method to interconnect multiple networks securely over the internet. Which type of technology is required?

a dedicated ISP
a GRE IP tunnel
a leased line
a VPN gateway

Explanation: A GRE IP tunnel does not provide authentication or security. A leased line is not cost-effective compared to using high-speed broadband technology with VPNs. A dedicated ISP is not required when utilizing VPNs between multiple sites.

Exam with this question: 8.4.2 Module Quiz - VPN and IPsec Concepts
Exam with this question: CCNA 4 v6 Chapter 3: Check Your Understanding