"Recruiter: wrong, it's SYN, SYN-ACK and ACK; if Google is down you will need to know this to diagnose what the problem is. We will stop here because it's obvious that you don't have the necessary skills to write or review network applications. "
Because when Google is down, it's typically upper management that fixes network issues. CEO level to directors of engineering are on pager duty most nights there.
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