tcp/ip, subnet mask, headers, mac addresses
Network Technology Interview Questions
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Tell me about a time you solved a problem.
Networking was solely focused on Layer 2 TCP/IP, OSPF, DHCP, and few other protocols. The opening question was what is your favorite L2-L3 protocol. Then slowly build the questions around this, threw in negative scenarios as well
A brief self introduction, followed by asking which protocol am I most comfortable with and I went ahead with BGP. The interviewer started with basic BGP questions, his questions were too generic (this is the catch). Why can't we use OSPF to connect all the systems together, and what is unique about BGP? What is autonomous system? How is the routing information exchanged? What's the difference between iBGP and eBGP peers? How does BGP differentiate between external and internal peers? How is a BGP session established? How to prevent loopback? How to control inbound/outbound traffic? Is there any inspection before sending a route to a different neighbour, by the sender or receiver?
- design basic network with couple of router and switch
Walk me through how you'd troubleshoot a server that's not reachable. What happens when you type a URL in a browser? How does BGP work and when would you prefer it over OSPF? Describe a time you troubleshooted a complex network issue. Explain how TCP handshake works. What's the difference between TCP and UDP? How do you find a memory leak in a Python script? What are common causes of high CPU usage on a Linux server? Explain optical networking and the challenges at Layer 0/1. How does DNS resolution work behind the scenes?
they asked about basics what is DNS, BGP,TCP,UDP etc.
They test you on how much you know and how you implemented that in your work.
How ca. i optimize my code
Please provide an example of an attribute you wish to improve upon.
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