Interview Q&A / Computer Networks

1. What is the difference between HTTP and HTTPS, and what does TLS actually do?

   HTTPS is HTTP sent inside a TLS connection. TLS gives three things plain HTTP lacks - encryption so others on the network cannot read the data, integrity so it cannot be changed in transit, and authentication through a certificate so you know you are talking to the real site.

   BeginnerIn-depth4 min read
2. At which OSI layer does TLS work?

   TLS has no clean place in OSI. It runs on top of TCP and below HTTP, so it is usually described as layer 6 (presentation) or between layers 4 and 7. In the TCP/IP model it simply sits inside the application layer.

   IntermediateQuick answer1 min read