In this class an introduction to computer networks with focus on the Internet and its security is given. Basic functionality of complex protocols are introduced. Students learn to understand these and identify common principles. In the exercises these basic principles and an introduction to performance modelling are addressed using computing tasks and (virtual) labs.
In the second part of the lecture an introduction to Internet security is given.
This class comprises:
- What's the Internet?
- Application layer protocols (HTTP, SMTP, DNS)
- Transport layer protocols (TCP, UDP)
- Network Layer (Internet Protocol, routing in the Internet)
- Data link layer with media access at the example of Ethernet
- Internet security: IPSec
- Internet security: Firewalls

- Kurose, Ross, Computer Networking - A Top-Down Approach, 6th/7th/8th Edition, Addison-Wesley
- Kurose, Ross, Computernetzwerke - Der Top-Down-Ansatz, Pearson Studium; Auflage: 6/7
- W. Stallings: Cryptography and Network Security: Principles and Practice, 6th edition
-Further literature is announced at the beginning of the lecture.