Class notes

Notes Computer Networks (CN)

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Course
Computer Networks (CSE1405)

Institution
Technische Universiteit Delft (TU Delft)

Lecture Notes + Self Study Assignments Computer Networks (CN) Year 1 (2022/2023) Computer Science and Engineering at TU Delft Topics 1 Introduction 2 Data Link Layer 3 MAC SubLayer 4 Network Layer 5 Transport Layer 6 Application Layer 7 Security + Self Study Assignments 1 Error Detection and Correc...

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Uploaded on October 11, 2024
Number of pages 115
Written in 2022/2023
Type Class notes
Professor(s) Stefanie roos + otto visser
Contains All classes

computer networks
data link layer
mac sublayer
network layer
transport layer
application layer
security
error detection
error correction
cryptography
tcp
parity
crc
s box
p box
rsa

Institution
Technische Universiteit Delft (TU Delft)
Education
Computer Science And Engineering
Course
Computer Networks (CSE1405)

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Overview Computer Networks (CN) (Notes + Tutorials + Exam Questions)

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1. Class notes - Notes computer networks (cn)
2. Other - Tutorials computer networks (cn)
3. Exam (elaborations) - Exam questions computer networks (cn)
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Topics + Self Study Assignments - Computer Networks CSE1405
CSE TU Delft - Lieke Sanders

Topic 1 - Introduction

Topic 2 - Data Link Layer

Topic 3 - MAC SubLayer

Topic 4 - Network Layer

Topic 5 - Transport Layer

Topic 6 - Application Layer

Topic 7 - Security

Self Study Assignment 1 - Error Detection and Correction

Self Study Assignment 2 - Cryptography

,Topic 1 - Introduction

Lecture 1

Tor = hides your identity (IP address) on the web

Obtaining relays
1 Publicly available list (default) (blocked)
- Download and choose randomly
- Easy to block

2 Private relays (bridges) (not all blocked)
- Set of relays not included in public list
- Changed frequently
- Can be requested (for example, by email)
- Only give out small number, not complete list

Protocols
- Algorithm for communication between two or more parties
- Defines the rules of communication
- Provides a service (function signature)

,Layers
There are layers in protocols that provide levels of abstraction, because every layer provides
a service that is only communicated to the layer above or below

Network layers are often the same layers on multiple machines, and only the lowest one
actually communicates

, Physical layer
Sends one bit via a physical medium like an ethernet cable

Data link layer
Sends a sequence of bits over a link reliably, like a phone sending data to a wifi router. Here,
reliability is needed, so there needs to be something in place to ensure that the data is sent
correctly

Network layer
Sends data from one computer in a network to another

Transport layer
Sends data in a reliable or unreliable way over an unreliable network

Application layer
Sends application-specific information over the network

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