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Networking Concepts

FORE SEC Academy Security Essentials. Networking Concepts. Networking C oncepts Agenda. Chapter 1 : Network Fundamentals Chapter 2 : IP Concepts (I) Chapter 3 : IP Concepts ( II) Chapter 4 : IP Behavior Chapter 5 : Wireless Network Security

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Networking Concepts

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  1. FORESECAcademySecurity Essentials Networking Concepts

  2. Networking Concepts Agenda Chapter 1: Network Fundamentals Chapter 2 : IP Concepts (I) Chapter 3 : IP Concepts (II) Chapter 4 : IP Behavior Chapter 5 : Wireless Network Security Chapter 6 : Physical Security

  3. Network Fundamentals Topics • Topology • Ethernet, Token Ring, FDDI, ATM, 802.11, VOIP, HDLC/SDLC, ISDN, and X.25 • Network Hardware • VLANs • Network Design

  4. Types of Networks • LANS - Local Area Networks • MANS - Metropolitan Area Networks • WANS - Wide Area Networks

  5. Physical Topologies • Defines how systems are connected together - Not the protocols in use • Bus Topology • Ring Topology • Star Topology

  6. Logical Topologies • Independent of physical Topologies • Logical Topologies - Ethernet - Token Ring - Fiber Distributed Data Interface (FDDI) - Asynchronous Transfer Mode (ATM) - High Level Data Link Control (HDLC) - Integrated Services Digital Network (ISDN) - X.25

  7. Ethernet • Ethernet is “baseband” or shared media • Only one station is allowed to be transmitting at any given time within a single collision domain • All stations are required to listen before they transmit • All stations are required to monitor their transmission to check for collisions • CSMA/CD

  8. Token Ring and FDDI • Communication is token-based • Each station condition/amplifies the token as it is passed • Typically, only one token is allowed per ring; however, there can be two (early release) • FDDI adds a second ring for fault tolerance

  9. Asynchronous Transfer Mode (ATM) • Encapsulates common protocols • Uses Virtual Path Identifiers (VPI) to create end-to-end connectivity • ATM uses a fixed cell size (48 bytes) for better Quality of Service (QoS) • Like combining Ethernet and IP

  10. 802.11 • 802.11 standard supports 3 physical layers: - Infrared - Radio Frequency - FHSS-Frequency Hopping Spread Spectrum - DSSS-Direct Sequence Spread Spectrum • Branched into 802.lla, 802.llb, and 802.llg • 802.llb supports up to 11 Mbps at 2.4GHz • 802.lla supports up to 54 Mbps at 5GHz • 802.llg supports up to 54 Mbps at 2.4 GHz (new)

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