防火墙

防火牆
fánghuǒqiáng
firewall

CEDICT

Entry Composition

1 防火 fánghuǒ to protect against fire
=2 墙 qiáng variant of 墙 qiáng
=2 墙 qiáng (slang) to block (a website) (usu. in the passive: 被墙 bèiqiáng)

classifiers: 面, 堵