I applied online. The process took 3 weeks.

The first interview was with HR, who was super nice. I answered some written tech questions by email, and then there was a technical interview with the team where we mostly went through the written test. I felt like they were not interested at all, like they already had another candidate in mind for the role, but still had to take my interview. I asked for feedback for self-improvement after being declined, but I have been ghosted since then.

You have an HTTP client and server on the same physical and logical network. Describe the communication between them on each layer of the OSI model as much as you know. What addresses are used on layers 1 to 3? How do they find each other on layers 1 to 3?