A Program That Monitors Traffic and Blocks Access
This page is the CodyCross answer for the clue below from California, Group 1158, Puzzle 5 (Emerald Bay).
Question is: A Program That Monitors Traffic and Blocks Access
and the answer is: FIREWALL
Word Meaning:
FIREWALL — (architecture) A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.
Definitions from Wiktionary.