Confirming Expected Results

BC.

The command "echo 0 > /proc/sys/net/ipv4/ip_default_ttl" is used to set the default Time-To-Live (TTL) value for IP packets to 0. The TTL field in an IP packet is used to limit the lifetime of a packet and prevent it from looping indefinitely in a network. When a packet reaches a router, the TTL field is decremented by one. If the TTL reaches zero, the packet is discarded.

By setting the default TTL value to 0, any IP packets sent from the workstation will have a TTL of 0, meaning they will not be able to leave the local subnet. This effectively ensures that all network traffic stays within the local subnet.

To confirm that the expected results have been achieved, the technician can use the following commands:

1. "tcpdump": This command is used to capture and analyze network traffic. By running tcpdump on the sensitive workstation, the technician can verify that all network traffic is indeed staying within the local subnet.

2. "route": This command displays the kernel routing table, which shows how packets are routed in the network. By examining the routing table on the sensitive workstation, the technician can verify that there are no routes that would allow network traffic to leave the local subnet.

Note that the other options (traceroute, iperf, ip, and arp) are not directly relevant to verifying the expected results of the "echo 0 > /proc/sys/net/ipv4/ip_default_ttl" command. Traceroute is used to trace the route of packets through a network, iperf is used for network performance testing, ip is used to display and manipulate network interfaces, and arp is used for mapping MAC addresses to IP addresses. While these commands may be useful for other network-related tasks, they are not necessary for verifying the expected results of the given command.