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Department of Informatics - Communication Systems Group

Exercises

In total, 13 exercise sheets are released on Thursdays, about every week. An exercise sheet addresses the content of previous lectures. After the release date, one week is available before the discussion takes place on Thursdays at 10.00. While the submission of the answers is not mandatory, a 10% bonus (in terms of exam points) is allocated for those who submit a complete set of answers for at least 10 out of 13 exercises. For students enrolled only in one of the Computer Networks (CN) or Distributed Systems (DS) parts, the minimum requirement is 5 full submissions for each part to receive the 10% bonus. In any case, students must submit the exercise on the "Security" topic to obtain the bonus. Submissions must be uploaded via OLAT latest by Wednesdays 11:00 pm. Late submissions are not accepted.

Be aware that some questions may not allow for a definite answer to encourage a discussion during the exercises. During the exercises, all questions and tasks are addressed. Volunteers might be asked to present their views and replies.

In case you have problems with downloading the files (e.g., showing error 404) check your VPN settings and delete your browser's cache!

 

Exercise Hand-out Date Responsible Discussion Date Remarks
EX1 (PDF, 138 KB) 23.09.2021 Sina Rafati 30.09.2021

- Introduction to Computer Networks

- Architectures, Services, and Protocols

EX2 (PDF, 59 KB) 30.09.2021 Sina Rafati 7.10.2021 - Multiplexing and Modulation
EX3 (PDF, 165 KB) 08.10.2021 Sina Rafati 14.10.2021 - Error Control, Reliable Transmissions
EX4 (PDF, 104 KB) 15.10.2021 Sina Rafati 21.10.2021 Error Control, Reliable Transmissions, Media Access
EX5 (PDF, 271 KB) 22.10.2021 Sina Rafati 28.10.2021 Switching, IP, Spanning Trees, Routing
Ex6 (PDF, 130 KB) 29.10.2021 Sina Rafati 04.11.2021 Routing Algorithms, TCP, UDP
Ex7 (PDF, 286 KB) 04.11.2021 Jan von der Assen 11.11.2021 Application Layer Protocols
Ex8 (PDF, 221 KB) 11.11.2021 Rafael Ribeiro 18.11.2021 Introduction to Distributed Systems
Ex9 (PDF, 475 KB) 18.11.2021 Rafael Ribeiro 25.11.2021 Naming and Distributed File Systems
Ex10 (PDF, 433 KB) 25.11.2021 Rafael Ribeiro 02.12.2021 Synchronization in Distributed Systems
Ex11 (PDF, 292 KB) 02.12.2021 Rafael Ribeiro 09.12.2021 Coordination
Ex12 (PDF, 292 KB) 09.12.2021 Rafael Ribeiro 16.12.2021 Distributed Systems in Use
Ex13 (PDF, 436 KB) 16.12.2021 Jan von der Assen 23.12.2021 Security in Computer Networks and Distributed Systems

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An exercise sheet mostly addresses the content of that day's lecture. After the release, six days are available to complete the exercise and submit the solution via OLAT. The exercise is discussed in the exercise session of the day after the submission deadline. Therefore, solutions have to be submitted before the beginning of the exercise session. 

Exercises of this lecture are determinant for all students who want to achieve successful participation in the written exam. In order to judge individual understandings of exercise contents, tutors may ask students at any time and unexpected to present their solution. Students that submit at least ten out of the thirteen proposed exercises throughout the semester will receive a bonus of 10% in the final grade. In order to receive the bonus, every student has to fulfill the following requirements:

  • Preparation and Submission of at least ten of exercise sheets during the semester, before their respective deadline. Students that are only enrolled in the CN or DS parts of the lecture must submit answers to at least five exercises. The exercise on "Security" must be addressed by all students wishing to obtain the bonus.
  • Each submitted answer for the exercises should be complete and meet a proper level of quality.
  • Present solutions when requested during the exercise sessions.

The correct answers for the exercises will be provided and discussed during the exercise class. Therefore, individual feedback will not be provided.