Arista Networks interview questions

Question from Hiring Manager: 1. How is the NULL pointer implemented on a linux system? What is the implication of mapping BSS to the Virtual Memory Segment 0?

Question from Hiring Manager: 2. A snippet of http internet server daemon involving socket(), bind(), listen() followed by while loop (which does accept(), process of http request and close() on the accepted fd). Any subsequent http request from a client is blocked till the erstwhile request is completed. Discuss the reasons as to why the server daemon throughput would get affected assuming that the loop to accept and service the request would get executed in say 10ms in the local machine running the server. What is the throughput for this server in terms of requests/sec? What are the reasons why the throughput would get affected? Assuming that 1% of the clients cause a 1 sec delay, calculate the throughput. What is typically the wait till for the socket tcp con block to be removed ( length of inactivity time)?