Computer Networks, Spring Semester 2026

Basic Course Information (subject to change)

Course ID	252-0064-00L
Language	English
Lecturers	Prof. Dr. Adrian Perrig Dr. Simon Scherrer
Teaching Assistants	Dr. Jong Hoon Kwon — Head TA Marco Pioppini — Exercise TA (Lead) Elham Ehsani — Exercise TA Zechao Cai — Exercise TA Yi-Min Lin — Exercise TA Felix Stöger — Project TA Liwen Xu — Project TA Francesco Da Dalt — Exam TA François Wirz — Support TA Tilmann Zäschke — Support TA Jelte van Bommel — Support TA
Student Assistants	Brunne Ferdinand — Exercise Sessions Petke Annik — Exercise Sessions Nemes Tamás — Exercise Sessions Lyubomir Yanev — Exercise Hand-ins Kilic Metehan — Exercise Hand-ins Emanuel Mairoll — Projects
Contact	Please do not send emails to our personal email addresses. Instead, use the following points of contact: Actively participate during the lectures and exercise sessions. Use GitLab issues for questions regarding lectures, exercises, and projects. Always add the label(s) corresponding to your issue. For personal or confidential questions create a confidential issue on Gitlab. If you do not have access to Gitlab, or in case of other problems preventing you from creating an issue on Gitlab, send an email to jong.kwon@inf.ethz.ch. Please only use the email option if creating a GitLab issue is not possible.
Teaching	All teaching will be in person. However, recordings will be made available. Besides at the exam, no attendance is required to pass this course.
Lectures	Monday 14:15‒16:00, HG E7 Friday 10:15‒12:00, HG F1
Exercise Sessions	Tuesday, 16:15‒18:00, ML H44 Tuesday, 16:15‒18:00, RZ F21 Thursday, 14:15‒16:00, HG D7.2 Feel free to select the exercise session that suits you best. On Tuesdays, RZ F21 typically has available seats, whereas ML H44 tends to be crowded. We recommend not only considering ML H44 but also RZ F21 for a more comfortable experience.
Exam	Written computer exam. The exam will take place in the period between August 5 to August 30; the exact date is yet to be determined and will be announced around end of June.
Project	The course will offer optional assignments, in which students solve practical networking problems using an emulator. Together, these assignments contribute a bonus of 0.5 grade points to the course grade. Achieving the highest grade is also possible without completing the projects. More information will be provided in the lectures.
Course Catalogue	252-0064-00L Computer Networks
Course Material	Course materials are distributed via GitLab: Resources: Contains lecture slides, learning materials, exercise sheets, and old exams. Issues: For questions, discussions, and announcements. You should automatically be granted access to the relevant GitLab projects no later than four hours after registering for the course on myStudies, or one hour after logging in to the D-INFK GitLab instance for the first time, whichever is later. If this is not the case, send an email to jong.kwon@inf.ethz.ch.
Recordings	Recordings will be available on the ETH video portal the day after the lecture or exercise class. General information related to lecture streaming and recording is available here.

Course News

16.12.2023	The website for the Computer Networks course is online.

Schedule

Subject to change.

Week 1	Lecture	16.02.2026 20.02.2026	Course organization, networking basics Layering, network metrics
	Exercise	17.02.2026 19.02.2026	[!] No exercise sessions
Week 2	Lecture	23.02.2026 27.02.2026	DNS Web/HTTP
	Exercise	24.02.2026 26.02.2026	Discussion exercise sheet 1
Week 3	Lecture	02.03.2026 06.03.2026	Transport principles Internet transport
	Exercise	03.03.2026 05.03.2026	Discussion exercise sheet 2
Week 4	Lecture	09.03.2026 13.03.2026	Transport sockets Network layer
	Exercise	10.03.2026 12.03.2026	Discussion exercise sheet 3
Week 5	Lecture	16.03.2026 20.03.2026	Network layer (continued) Network layer (continued), routing
	Exercise	17.03.2026 19.03.2026	Discussion exercise sheet 4
Week 6	Lecture	23.03.2026 27.03.2026	Routing (continued) BGP
	Exercise	24.03.2026 26.03.2026	Discussion exercise sheet 5
Week 7	Lecture	30.03.2026 03.04.2026	BGP (continued) [!] No lecture on Friday (Good Friday)
	Exercise	31.03.2026 02.04.2026	Discussion exercise sheet 6
	Project	30.03.2026	Publication project 1
Week 8	Lecture	06.04.2026 10.04.2026	[!] No lectures (Easter break)
	Exercise	07.04.2026 09.04.2026	[!] No exercise sessions (Easter break)
Week 9	Lecture	13.04.2026 17.04.2026	Link layer (protocols) Link layer (framing and error correction)
	Exercise	14.04.2026 16.04.2026	Discussion exercise sheet 7
Week 10	Lecture	20.04.2026 24.04.2026	[!] No lecture (Sechseläuten) Link layer (framing and error correction), physical layer
	Exercise	21.04.2026 23.04.2026	Discussion exercise sheet 8
	Project	24.04.2026	Deadline project 1 (23:59)
Week 11	Lecture	27.04.2026 01.05.2026	Summary [!] No exercise session on Thursday (Labour Day)
	Exercise	28.04.2026 30.04.2026	Discussion exercise sheet 9
Week 12	Lecture	04.05.2026 08.05.2026	CDNs/Video SCION
	Exercise	05.05.2026 07.05.2026	Discussion exercise sheet 10
	Project	04.05.2026	Publication project 2
Week 13	Lecture	11.05.2026 15.05.2026	SCION (continued) Algorithms
	Exercise	12.05.2026 14.05.2026	Discussion exercise sheet 11 [!] No exercise session on Thursday (Ascension)
Week 14	Lecture	18.05.2026 22.05.2026	Algorithms (continued) Network monitoring
	Exercise	19.05.2026 21.05.2026	Discussion exercise sheet 12
Week 15	Lecture	25.05.2026 29.05.2026	[!] No lecture (Pentecost Monday) Routing security
	Exercise	26.05.2026 28.05.2026	Discussion exercise sheet 13
	Project	29.05.2026	Deadline project 2 (23:59)