The recruiter asks more questions related to , what happens when you enter a website, more to do with DNS, TCP handshake and different ports for the initial round. During the main interview, one of them questioned mostly with SSL termination at proxy level, understanding TCP handshake, more questions were asked on Wireshark, only expert level experience with Wireshark can take this interview, if not its too difficult. learn about SNI, types of proxies, VPN, GRE tunnel, IPSec tunnel , SSL certs , PAC and DNS.