Question

For 1000 nodes in IP level, how many keys would be required?

(a) 499000

(b) 499500

(c) 500500

(d) 500000

I got this question in a job interview.

I need to ask this question from Overview in division Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

Answer 1

Correct choice is (b) 499500

For explanation I would say: Use N(N-1)/2 where N=1000.