A Linux administrator has configured a Linux system to be used as a router. The administrator confirms that two network adapters are properly installed and functioning correctly. In addition, the output of the iptables -L command appears to contain a complete firewall configuration. Which of the following commands does the administrator need to issue for the router to be fully functional?

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A. echo "1" > /proc/sys/net/ipv4/ip_forward This command sets the `/proc/sys/net/ipv4/ip_forward` kernel parameter to '1', which enables IP forwarding. Enabling IP forwarding is essential for a Linux system to act as a router, allowing it to forward incoming network packets from one interface to another.

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B. echo "0" > /proc/sys/net/ipv4/tcp_abort_on_overflow The `tcp_abort_on_overflow` parameter controls TCP connection behavior when the listen queue overflows, which is not directly related to enabling the fundamental IP routing functionality.

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C. echo "0" > /proc/sys/net/ipv4/max_connections There is no standard kernel parameter named `max_connections` in `/proc/sys/net/ipv4/` that limits the total number of connections in this manner, and setting an unknown parameter to '0' would not enable routing.

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D. echo "1" > /proc/sys/net/ipv4/ip_default_ttl The `ip_default_ttl` parameter sets the default Time-To-Live for outgoing IP packets, which is a packet attribute, not the mechanism for enabling the core routing capability itself.

A Linux administrator has configured a Linux system to be used as a router. The administrator confirms that two network adapters are properly installed and functioning correctly. In addition, the…

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