90% techinicial questions for phone screen; Both technicial and behavioural qustions for loop interviews; Technicial questions: tcp/ip, 3 way handshake, fibre connectors, multi-mode and singal mode fibre, post mode, basic linux commands, how to build a desktop, how to trouble ram and motherboard issue, basic network questions, cisco basic concepts and commands, ip subnetting, common service port number such as http, https, dns, etc Behavioural questions: focus on customer obsession, ownership, learn and be curious and dive deep.