Cryptic crossword clue
Network protection has signal carrier go down when switching leads 8

The most common and most likely answer to this crossword clue is the 8 letter word FIREWALL

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FIREWALL mean?

FIREWALL noun
  1. A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.
  2. The software that monitors traffic in and out of a private network or a personal computer and allows or blocks such traffic depending on its perceived threat.
  3. A hypothetical phenomenon where an observer falling into a black hole encounters high-energy quanta at or near the event horizon.
FIREWALL verb
  1. To protect with a firewall.
  2. To block with a firewall.
  3. (motor vehicles or aircraft) To use maximum acceleration.

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