Welcome to your interview.
The question is on your right: Networking and Security Troubleshooting. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Walk me through how you would troubleshoot a networking and security issue involving ARP, TCP handshakes, NAT/PAT, SSL handshakes, IPsec, OSPF states, BGP path selection, and TCP header flags/options.