1. One task: Description. Please describe a practical case where the application protocols DNS, POP3, FTP, HTTP and the transport protocols TCP, UDP are used. Note: Referring to the online resource, textbook or slides are allowed. Please dont copy others answers. There are many application cases you could find. It is easy for me to tell if you have copy solutions from the same original one. Again, grading is also grounded on how hard you want to learn and work for yourself.

Hint: here is an example case in order for you to start thinking the application scenarios:

1. (a) Turn on your laptop nd connect it to the a WIFI router DNS - get the local network IP

2. (b) Turn on your outlook client app on the laptop POP3 - get an email

3. (c) In the email, there is a link to a website, click the link TCP - setup the connection

   to the website and Http over TCP - httpget to request the website homepage

4. (d) Open the website homepage WWW - the browser displays the homepage

5. (e) In the webpage, a download link of a video app is available FTP - download the video app

6. (f) Install the downloaded video app and open it, it starts playing video UDP - streaming video using UDP transport protocol.