5. Concept of Computer Network and Network Security System

5.1 Introduction to Computer Networks and Physical Layer

  • Networking Model, Protocols and Standards

  • OSI Model and TCP/IP Model

  • Networking Devices (Hubs, Bridges, Switches, and Routers)

  • Transmission Media

5.2 Data Link Layer

  • Services, Error Detection and Corrections, Flow Control

  • Data Link Protocol

  • Multiple Access Protocols

  • LAN Addressing and ARP (Address Resolution Protocol)

  • Ethernet, IEEE 802.3 (Ethernet), 802.4 (Token Bus), 802.5 (Token Ring), PPP (Point to Point Protocol)

  • CSMA/CD

  • IEEE 802.3 Standard

  • Wireless LANs

5.3 Network Layer

  • Addressing (Internet Address, Classful Address), Subnetting

  • Routing Protocols (RIP, OSPF, BGP, Unicast and Multicast Routing Protocols)

  • Routing Algorithms (Shortest Path Algorithm, Flooding, Distance Vector Routing, Link State Routing)

  • Network Layer Protocols: ARP, RARP, IP, and ICMP

  • IPv6 (Packet Formats, Extension Headers, Transition from IPv4 to IPv6, Multicasting)

5.4 Transport Layer

  • The Transport Service, Transport Protocols

  • Port and Socket, Connection Establishment & Connection Release

  • Flow Control & Buffering, Multiplexing & De-multiplexing

  • Congestion Control Algorithm

5.5 Application Layer

  • Web (HTTP & HTTPS), File Transfer (FTP, PuTTY, Win SCP)

  • Electronic Mail, DNS, P2P Applications

  • Socket Programming, Application Server Concept

  • Concept of Traffic Analyzer (MRTG, PRTG, SNMP, Packet Tracer, Wireshark)

5.6 Network Security

  • Types of Computer Security, Types of Security Attacks

  • Principles of Cryptography, RSA Algorithm

  • Digital Signatures, Securing E-mail (PGP)

  • Securing TCP Connections (SSL), Network Layer Security (IPsec, VPN)

  • Securing Wireless LANs (WEP), Firewalls

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