SANS560 GIAC Penetration Tester (GPEN) Practice Test

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Which command pattern is commonly used to perform a ping sweep by iterating over IP addresses?

nslookup

for /L %i in (1,1,254) do ping -n 1 192.168.1.%i

This tests using a loop to generate a range of IPs and ping them one by one. In Windows batch, a for /L loop creates a numeric sequence with the syntax (start, step, end). Here it starts at 1, increments by 1, and ends at 254. The command then pings 192.168.1.%i for each value of i, producing addresses from 192.168.1.1 to 192.168.1.254 and pinging each once. This is a classic ping sweep over a /24 subnet.

The other options don’t sweep: one performs a single DNS lookup, another sends a single ping to one address, and the last traces the route to a destination.

ping -n 1 192.168.1.1

tracert 192.168.1.1