# Unit 6 · HTTP, DNS, FTP and SMTP · optional practice

Subject: Computer Networks

Exam: TEE

Reader: https://deep-learning-study-room.vercel.app/cn/#tee/practice/applications

Canonical: https://deep-learning-study-room.vercel.app/read/cn/tee/practice-chapter/applications/

Optional extension · no matching calculation in the two supplied papers

1. [Supporting HTTP timing · example 1](https://deep-learning-study-room.vercel.app/read/cn/tee/practice/applications--http-time-1/)
2. [Supporting HTTP timing · example 2](https://deep-learning-study-room.vercel.app/read/cn/tee/practice/applications--http-time-2/)
3. [Supporting HTTP timing · example 3](https://deep-learning-study-room.vercel.app/read/cn/tee/practice/applications--http-time-3/)