Aggressive Mode is the correct choice when one peer (the branch with a dynamic IP) needs to initiate the tunnel to a peer with a static IP (headquarters). It completes the IKE SA negotiation in fewer packets, allowing the dynamic peer to identify itself and establish the tunnel efficiently, whereas Main Mode requires more exchanges and is better suited for static-to-static scenarios.

Multimedia protocols like H.323 or SIP use dynamic ports for media streams (e.g., RTP/RTCP). A basic stateful firewall cannot inspect the control protocol to anticipate and allow these dynamic sessions. Enabling ASPF (Application Specific Packet Filter) for the specific multimedia protocol allows the firewall to dynamically open pinholes for the media channels, resolving the intermittent connectivity.

Inline deployment places the Anti-DDoS cleaning center directly in the path of all traffic entering the data center network. This ensures that all traffic, including attack traffic, is forced to pass through the scrubbing device before reaching the protected servers, thereby guaranteeing the data center’s bandwidth is preserved for clean traffic only.

The most precise method is to refine the signature itself. Adding more specific matching conditions—such as a unique string found only in the exploit payload or a specific application-layer request path—makes the signature more accurate. This reduces matches against benign traffic while maintaining detection capability for the actual malicious activity. Other options are more generic and less effective.

HTTPS (HTTP over SSL/TLS) on TCP port 443 provides encrypted communication for web-based management interfaces. This complies with the policy requiring encryption for management traffic. HTTP (port 80) and Telnet (port 23) are unencrypted. SSH (port 22) is encrypted but is used for command-line access, not the web interface.

The Principle of Least Privilege dictates that users and systems should have only the minimum access necessary to perform their functions. Placing all departments in a single zone allows any system in one department (e.g., R&D) unrestricted access to systems in another (e.g., Finance), which is excessive and insecure. Proper segmentation into separate zones or security domains enforces this principle.

Ping (ICMP) working indicates basic IP connectivity and routing are functional. The failure of a specific TCP service, despite a security policy, strongly points to a NAT issue. The “NAT Server” configuration is required to map the public IP and port to the private IP and port of the server in the DMZ. If this mapping exists only for ICMP or is missing for the TCP port, the TCP service will fail.

Anomaly Detection works by learning a baseline of normal behavior (e.g., packets per second, bytes per flow for a protocol) over a period. It then monitors traffic and triggers alerts or mitigation actions when current traffic deviates significantly from this learned baseline, making it effective against unknown or zero-day attacks that don’t have a known signature.

Web Filtering functions by checking requested URLs against a categorized database. Phishing and malicious websites are specific categories within this database. When a user attempts to access a URL categorized as “Phishing” or “Malicious Websites,” the firewall can block the request, preventing the accidental visit. Other options target different threats (malware, intrusions, data exfiltration).

Aggressive Mode is the correct choice when one peer (the branch with a dynamic IP) needs to initiate the tunnel to a peer with a static IP (headquarters). It completes the IKE SA negotiation in fewer packets, allowing the dynamic peer to identify itself and establish the tunnel efficiently, whereas Main Mode requires more exchanges and is better suited for static-to-static scenarios.0