Using the reject parameter as the next-hop value for a static route

CD

When a static route with a "reject" parameter is configured as the next-hop, it means that the router will not forward packets to the destination address defined in the static route. Instead, the router will either drop the packet or send an ICMP message to the source of the packet, depending on the configuration.

The correct statements when using the "reject" parameter as the next-hop value for a static route are:

1. The packet is dropped from the network: When a router receives a packet with a destination address matching a static route with the "reject" parameter, the router will discard the packet and generate an ICMP Destination Unreachable message with Code 13 (Communication Administratively Prohibited) as a reply to the source. This is because the router has been explicitly configured not to forward packets to that destination.

2. The system sends an ICMP message back to the source of the packet: As mentioned above, when a packet is discarded due to a static route with the "reject" parameter, the router generates an ICMP message with the appropriate code to inform the source of the packet that the destination is unreachable. This message is sent back to the source of the packet, which can then take corrective action, such as sending the packet to a different destination or troubleshooting network connectivity.

Therefore, options C and D are correct. Options A and B are incorrect because the "no-readvertise" parameter is not related to the "reject" parameter, and the system does not send the packet back to the source, it only sends an ICMP message.