Answers:
1. D
2. A
3. B
4. C
Explanation: I just did it and got a 100%
The answer is 'tracert'. Tracert or traceroute command is a form of a diagnostic tool which allows you to capture information as the packet is sent from the source and destination providing the route taken and measure of delay across the IP network.
Most of the web applications are written with SPA frameworks such as Angular, React, Vue.js, etc. The problem with these SPAs is that the single page is loaded in the browser once and then the framework will take care of all the routing among pages and gives the impression to the user that it is a multi-page application. When you refresh your page in the browser that single page called index.html is reloaded and you will lose the entire state of the application.