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Padhai By Astra Cloud

Elective Network Security

Network Security notes

8 chapter notes, in syllabus order. Each starts with the key points.

Unit 1 · 3 hrs

Network Security Basics: Threats, Models & Defense LayersUnit 1 of Network Security introduces foundational concepts of computer network security, covering threats, security models (confidentiality, integrity, availability), OSI security layers, and basic defense mechanisms like firewalls and encryption.11 min read

Unit 2 · 4 hrs

User Authentication: Methods, Protocols & SecurityUnit 2 of Network Security explores authentication mechanisms—passwords, biometrics, tokens, and multi-factor systems—how they work, their vulnerabilities, and real-world deployments in banking, e-commerce, and government services like eSewa and Ncell.11 min read

Unit 3 · 6 hrs

Transport Level Security: TLS/SSL, VPNs, Firewalls & Secure ProtocolsUnit 3 of Network Security explores Transport Layer Security (TLS/SSL), Virtual Private Networks (VPNs), firewalls, and secure protocols like HTTPS, FTPS, and SSH, explaining their mechanisms, cryptographic foundations, and real-world applications in securing data in transit.10 min read

Unit 4 · 6 hrs

Wireless Network Security: Threats, Protocols & CountermeasuresUnit 4 of Network Security explores vulnerabilities in Wi-Fi, Bluetooth, and cellular networks, covering encryption (WPA3, TLS), attacks (eavesdropping, MITM, jamming), and real-world defenses used by banks, eSewa, and Ncell to secure mobile transactions and IoT devices.15 min read

Unit 5 · 8 hrs

Electronic Mail Security: Protocols, Attacks & SafeguardsUnit 5 of Network Security explores how email systems are secured against threats like spoofing, phishing, and malware, covering protocols (SMTP, S/MIME, PGP), encryption methods, digital signatures, and real-world deployment in apps like eSewa and banks.15 min read

Unit 6 · 6 hrs

IP Security: Protocols, Attacks, and Protection MechanismsUnit 6 of Network Security explores IPsec (AH, ESP), IKE, VPNs, and attacks like spoofing, replay, and DoS, with real-world examples from eSewa, Ncell, and global networks. Learn how encryption, authentication, and key exchange secure IP traffic.7 min read

Unit 7 · 5 hrs

Endpoint Security: Devices, Attacks & ProtectionsUnit 7 of Network Security explores how to secure individual network endpoints (hosts, servers, IoT devices) against attacks, covering vulnerabilities, protection mechanisms, and real-world deployment strategies in both enterprise and consumer environments.18 min read

Unit 8 · 7 hrs

Cloud & IoT Security: Threats, Protocols & DefenseUnit 8 of Network Security explores the security challenges, protocols, and best practices for protecting cloud computing environments and Internet of Things (IoT) devices, including encryption, authentication, and attack mitigation strategies used by companies like Ncell and Daraz.9 min read