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Zenmap
A Windows-based GUI version of Nmap.
zero subnet
In a classful IPv4 subnet, the network number with all binary 0s in the
subnet part of the number. When written in decimal, the zero subnet has the same num-
ber as the classful network number.
zero-day attack
An attack carried out on a system or application before the vendor
becomes aware and before a patch or fix action is available to correct the underlying
vulnerability.
zombie
A computer system that performs tasks dictated by an attacker from a remote
location. Zombies may be active or idle, and owners of the systems generally do not
know their systems are compromised.
zone transfer
A type of DNS transfer where all records from an SOA are transmit-
ted to the requestor. Zone transfers have two options: full (opcode AXFR) and incre-
mental (IXFR).