Internet Security: A Hands-on Approach from Udemy

From Morris worm to Mitnick attack; from Mafia boy to Kaminsky attack; from Pakistan's hijacking of YouTube to Syria's shutting down of its own Internet. These are so many attacks on the Internet. If you want to learn how the Internet works, how it can be attached, and more importantly, how you can defend against these attacks, then this course is for you.

In this course, we systematically study each layer of the TCP/IP protocols, discuss the vulnerabilities in its design and implementation, and demonstrate how to exploit the vulnerabilities in attacks. Many classic attacks are covered in this course, with great technical details. The course won't just teach you the high-level concepts and theories; it would dive into the low-level technical details and fundamentals, so you can fully understand how exactly things work.

The course emphasizes hands-on learning. For each attack covered, students not only learn how the attack works in theory, they also learn how to actually conduct the attack, in a contained virtual machine environment. The hands-on exercises developed by the instructor are called SEED labs, and they are being used by over 1000 institutes worldwide. The course is based on the textbook written by the instructor. The book, titled "Computer & Internet Security: A Hands-on Approach, 2nd Edition", has been adopted by over 210 universities and colleges worldwide.

What's inside

Learning objectives

Study classic network attacks and gain in-depth understandings of their technical details
Study how the internet and the tcp/ip protocols work
Understand the security problems in the design and implementation of the tcp/ip protocols

Master the fundamental attack (ethical hacking) and defense skills in network security
Gain hands-on experiences through 11 labs (seed labs) developed by the instructor
Implement firewall, vpn, sniffer, spoofing, and various network security tools using c or python

Study classic network attacks and gain in-depth understandings of their technical details
Study how the internet and the tcp/ip protocols work
Understand the security problems in the design and implementation of the tcp/ip protocols
Master the fundamental attack (ethical hacking) and defense skills in network security
Gain hands-on experiences through 11 labs (seed labs) developed by the instructor
Implement firewall, vpn, sniffer, spoofing, and various network security tools using c or python

Syllabus

Course Overview, Lab Setup, and Network Basics

Course Overview (Part I)

Course Overview (Part II)

Lab Exercises and Setup

Network Basics: IP Addresses

NAT and Summary

Packet Sniffing and Spoofing

Introduction

Socket Programming and Sending Packets

Receiving Packets

Packet Sniffing

Sniffing Using PCAP

Sniffing Using Scapy

Packet Spoofing

Packet Spoofing Using Scapy

Scapy v.s. C

Byte Order

Summary and Lab Exercise

Lab Exercise

The MAC Layer and Attacks

The MAC Layer

The ARP Protocol

ARP Cache Poisoning Attacks

Man-In-The-Middle Attacks Using ARP Cache Poisoning

MITM Attack Demo

Question, Countermeasure, and Summary

Network Layer: IP, ICMP and Attacks

The IP Protocol

IP Fragmentation

Problem: Attacks Using IP Fragmentation

Solution: Attacks Using IP Fragmentation

Routing

Spoofing Prevention on Routers

The ICMP Protocol

ICMP Redirect Attack

Smurf Attack and Other ICMP Attacks

Summary

The UDP Protocol and Attacks

Transport Layer

The UDP Protocol

UDP Attacks

The TCP Protocol and Attacks

TCP Overview

Send and Receive Buffers

Sequence Number, Flow and Congestion Control

SYN Flooding Attack

TCP Reset Attack

TCP Session Hijacking

How Reverse Shell Works

Redirecting IO to TCP Connection

Creating Reverse Shell

The Mitnick Attack

The Mitnick Attack Demo

Countermeasures and Summary

DNS and Attacks

DNS Zone Hirarchy

The DNS Query Process

DNS Root Servers

Experiment Setup

Constructing DNS Packets

Overview of the Attack Surface

Local Cache Poisoning Attack

The Kaminsky Attack

Demo of the Kaminsky Attack

Fake Response Attack

DNS Rebinding Attack

Reverse DNS Lookup and Attacks

Denial of Service Attacks on DNS

Lab Exercises

Virtual Private Network

Why VPN, an Analogy, and Tunelling

IP Tunneling

TUN/TAP Virtual Interface

Create TUN/TAP Interface (Part 1)

Create TUN/TAP Interface (Part 2)

Going to Private Network

At the VPN Server

How Packets Return

Review of How VPN Works

A Case Study

Bypassing Firewall Using VPN

Summary and Lab Exercises

Firewall

Netfilter

Build a simple firewall

Linux Firewall iptables

Use iptables to Build Source NAT

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Develops core network security skills for network administrators and ethical hackers

Emphasizes hands-on learning with labs developed by the instructor

Covers classic and modern network attacks and vulnerabilities

Provides a systematic understanding of TCP/IP protocols and their security implications

Suitable for beginners and intermediate learners seeking to strengthen their network security foundations

May require prior knowledge of computer networking fundamentals

Textbooks and materials are not included in the course

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Internet Security: A Hands-on Approach with these activities:

Review Basic Networking Concepts

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Refreshing your knowledge of basic networking concepts will provide a solid foundation for understanding network security.

Browse courses on Networking

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Review your notes or study materials on network fundamentals.
Take practice quizzes or online tests to assess your understanding.
Attend a refresher session or watch videos on basic networking.

Read "TCP/IP Illustrated, Volume 1"

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Reading this classic book will provide a thorough understanding of the TCP/IP protocols, which is essential for mastering network security.

View TCP/IP Illustrated: The protocols on Amazon

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Read the chapters on IP addresses, routing, and transport layer protocols (TCP and UDP).
Take notes and highlight important concepts and diagrams.
Complete the exercises and review questions at the end of each chapter.

Participate in a Study Group

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Discussing course concepts with peers will reinforce your understanding and identify areas where you need further clarification.

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Find a study partner or group with similar interests.
Meet regularly to discuss the course material.
Quiz each other and work through practice problems.

Five other activities

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Packet Capturing and Filtering Practice

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Practice sniffing and filtering packets using Wireshark or other tools will strengthen your understanding of network communication and vulnerabilities.

Browse courses on TCP/IP Protocols

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Set up a lab environment with multiple hosts and a network switch.
Install and configure Wireshark or a similar packet sniffer on one of the hosts.
Start capturing packets on the network interface.
Use Wireshark's filters to isolate and analyze specific types of packets.

Follow Online Tutorials on Network Vulnerability Assessment

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Following online tutorials will provide additional guidance on how to assess vulnerabilities in networks.

Browse courses on network security

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Search for reputable online resources on network vulnerability assessment.
Follow the tutorials step-by-step and take notes.
Practice the techniques using the provided examples or set up a lab environment.

Volunteer at a Cybersecurity Organization

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Volunteering at a cybersecurity organization will provide you with hands-on experience and exposure to real-world security challenges.

Browse courses on network security

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Research and identify cybersecurity organizations that offer volunteer opportunities.
Contact the organizations and inquire about available roles.
Attend training or workshops to prepare for your volunteer role.
Participate in cybersecurity events, initiatives, or research projects.

Build a Simple Firewall

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Building a simple firewall from scratch will provide hands-on experience in implementing network security measures.

Browse courses on Firewall

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Choose a programming language and platform for your firewall (e.g., C, Python, Linux).
Design the firewall architecture and define its functionality.
Implement packet filtering and forwarding logic.
Test the firewall by simulating network traffic and verifying its effectiveness.

Participate in a Cybersecurity Challenge

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Participating in a cybersecurity challenge will push you to apply your skills and knowledge in a competitive environment.

Browse courses on network security

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Find a reputable cybersecurity challenge or competition.
Register and prepare for the challenge by practicing your skills.
Compete in the challenge and work with a team or individually to solve tasks.
Analyze your performance and learn from your mistakes.

Career center

Learners who complete Internet Security: A Hands-on Approach will develop knowledge and skills that may be useful to these careers:

Network Security Engineer

Network Security Engineers can benefit from this course through a deepened understanding of the TCP/IP protocols and how to implement them. This course can help Network Security Engineers make decisions concerning network security policies and procedures.

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Penetration Tester

Penetration Testers can use the information in this course to develop the skills needed to conduct and interpret ethical hacking exercises. This can help Penetration Testers with conducting security audits and improving their understanding of the potential threats to operating systems and networks. Additionally, the course can help Penetration Testers build a foundation for further study in the field of network security.

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Cybersecurity Engineer

A Cybersecurity Engineer can use this course to learn about the vulnerabilities in network protocols and how to exploit them. This knowledge may be useful in designing and implementing security measures to protect networks.

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Information Security Analyst

The skills and knowledge taught in this course may help Information Security Analysts in their work of designing and implementing security measures to protect computer networks and systems. The hands-on approach and technical details will help Information Security Analysts understand the potential threats to networks and how to develop countermeasures.

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Security Analyst

The in-depth understanding of network attacks and the TCP/IP protocols taught in this course may be useful for Security Analysts to build a foundation for their work in identifying and mitigating security risks.

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Network Administrator

The knowledge gained from this course on network protocols and security vulnerabilities may be useful for Network Administrators in their work managing and maintaining computer networks and systems.

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Software Developer

Software Developers may find the technical details and hands-on exercises in this course useful in their work of designing and developing secure software applications.

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Security Consultant

This course may be useful for Security Consultants in their work of providing advice and guidance to organizations on how to improve their security posture.

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Systems Engineer

Systems Engineers may find the technical details and hands-on exercises in this course useful in their work of designing, implementing, and maintaining computer systems.

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Forensic Analyst

Forensic Analysts may find the hands-on exercises and technical details in this course useful in their work of investigating computer crimes and network breaches.

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Ethical Hacker

Ethical Hackers can benefit from this course by learning about the technical details of network attacks. This knowledge can help Ethical Hackers develop the skills needed to conduct penetration tests and identify vulnerabilities in networks and systems.

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Technology Risk Manager

Technology Risk Managers may find the broad overview of network security and the hands-on exercises in this course useful in their work of assessing and managing technology risks.

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Information Technology Manager

Information Technology Managers may find the broad overview of network security and the hands-on exercises in this course useful in their work of managing and overseeing IT operations.

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Compliance Officer

Compliance Officers may find the broad overview of network security and the hands-on exercises in this course useful in their work of ensuring that an organization complies with regulatory requirements.

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Data Scientist

Data Scientists may find the technical details and hands-on exercises in this course useful in their work of analyzing data and developing models to improve network security.

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