What is the first line of defense when an organization is using a defense-in-depth approach to network security?

What is the first line of defense when an organization is using a defense-in-depth approach to network security?

• edge router
• firewall
• proxy server
• IPS

Explanation: A defense-in-depth approach uses layers of security measures starting at the network edge, working through the network, and finally ending at the network endpoints. Routers at the network edge are the first line of defense and forward traffic intended for the internal network to the firewall.

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