In this scenario:
* The Firebox has a route to the 10.0.20.0/24 network.
* The server has 10.0.2.1 as its default gateway.
* Clients on the 10.0.10.0/24 network use 10.0.10.1 as their default gateway.
The issue arises because the server is in the 10.0.20.0/24 network and should have a gateway that directs traffic through the appropriate path. However, since 10.0.2.1 is configured as the server's gateway, the server likely doesn't have a correct return path to the clients on 10.0.10.0/24. This misconfiguration prevents the server from properly routing responses back to clients.
* Option Cis correct because the misconfigured default gateway on the server disrupts the routing, preventing communication with clients.
* Option Ais incorrect because the router at 10.0.2.254 is used for routing but doesn't need additional configuration if the server's gateway is corrected.
* Option Bis incorrect because the clients have the correct gateway for reaching the Firebox.
* Option Dis irrelevant since adding an IP in 10.0.10.0/24 on the router won't resolve the routing issue.
* Option Eis incorrect because adding a route on the server wouldn't solve the default gateway misconfiguration.

The Address Resolution Protocol (ARP) is used to map an IP address to a physical machine (MAC) address on a local network. When a device wants to communicate with another device on the same local network, it uses an ARP request to discover the MAC address associated with a known IP address. The ARP process is essential for IP-based communication within the same network segment.
* Option Dis correct because ARP's primary function is to find the MAC address associated with an IP address.
* Other options mention IP addresses or hostnames, which would be resolved using other methods like DNS, not ARP.

* Link Monitor Target for Backup ISP: If the backup ISP's Link Monitor target is not responsive, the Firebox will not initiate a failover, as it interprets the backup connection as inactive or faulty.
* Primary ISP Link Monitor Configuration: When the Link Monitor for the primary ISP only checks the default gateway, it may not detect issues occurring further upstream. If the outage is beyond the gateway, failover will not activate because the monitor assumes the link is still valid.
These settings are critical to ensuring proper Multi-WAN failover behavior in case of ISP issues.

Analyzing a typical Firebox log message for a denied connection with an associated virus detection involves recognizing multiple elements:
* HTTP Proxy Detection (C): If the connection utilized an HTTP proxy, this is typically noted in the log. Firebox's HTTP proxy is often used to inspect and manage web traffic, including scanning for malicious content.
* Gateway AntiVirus Detection (D): This service scans HTTP traffic for malware and will generate log messages if it identifies a virus. When a virus is detected, the action taken is generally to block the connection.
* Connection Denial (E): When a threat is detected (e.g., a virus via Gateway AntiVirus), Firebox policies are configured to deny the connection to prevent potential infection or data breaches. This is logged as a denied connection.
Other options, such as Application Control detecting a virus or the use of an HTTP Packet Filter, are not relevant in this context based on the function of HTTP proxies and Gateway AntiVirus in Firebox logs.

In the policy configuration shown in the image:
* From Section: It specifies "Any-External" and 10.0.1.0/24, indicating that this policy applies to traffic from any external source (Internet users) as well as from devices on the internal network 10.0.1.0/24.
* To Section: The destination specifies a public-facing IP address (203.0.113.100) that is statically NAT'd to the internal IP address of the web server (10.0.1.80). This means external users and internal users can access the web server using the Firebox's external IP.
* Effect of Static NAT: The policy uses Static NAT to map the Firebox's external IP address to the web server's internal IP address, allowing inbound connections to reach the server. This setup provides consistent access for both external and internal users via the same public IP address.
This configuration effectively enables both Internet users and users within the specified internal network (10.0.1.0/24) to connect to the web server using the Firebox's external IP, makingOption Dthe correct answer.