ServiceNow Site Reliability Engineer interview questions

Indepth process of DNS resolution, Indepth process of HTTPS handshakes, Linux Performance tuning, Engineering problem (trouble shooting) like error 503 on the load balancer and where would you start to debug, 5 reasons a logfile cannot write to a location, Centrally Managed Users using sssd, Transit routing (HUB-SPOKE), Oracle-based questions, performance tuning, partitioning, vmstat vs iostat, git stash, git reset (hard and soft), git rebase, terraform backend, docker swarm and mesh networking

Can you explain how DNS works