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  A perimeter network or screened subnet separating an internal network that is more trusted from an external network that is less trusted.
NIST SP 1800-16B under Demilitarized Zone
NIST SP 1800-16C under Demilitarized Zone
NIST SP 1800-16D under Demilitarized Zone

  A network created by connecting two firewalls. Systems that are externally accessible but need some protections are usually located on DMZ networks.
NISTIR 7711 under Demilitarized Zone