A company wants to place an appliance at the edge of its network that will inspect every inbound and outbound packet and automatically block traffic that violates the organization's security policies. Which device BEST meets this requirement?
Intrusion detection system (IDS)
Load balancer
Firewall
Proxy server
A firewall operates inline at the network perimeter and enforces rule-based filtering, blocking any packet that does not comply with the defined policy. An intrusion detection system (IDS) only monitors traffic and raises alerts; it cannot actively stop packets. A proxy primarily intermediates application-layer requests and may provide caching or content filtering but does not serve as the main packet-filtering gatekeeper for all protocols. A load balancer spreads connections across multiple servers to improve performance and availability rather than providing security enforcement.
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