Information Security Officer Question:
Tell me what port does ping work over?
Answer:
A trick question, to be sure, but an important one. If he starts throwing out port numbers you may want to immediately move to the next candidate. Hint: ICMP is a layer 3 protocol (it doesn’t work over a port) A good variation of this question is to ask whether ping uses TCP or UDP. An answer of either is a fail, as those are layer 4 protocols.
| Previous Question | Next Question |
| Tell me what’s the difference between symmetric and public-key cryptography? | Tell me what kind of attack is a standard Diffie-Hellman exchange vulnerable to? |