Chapter 5: Ethernet

Chapter 5: Ethernet

1. Ethernet Encapsulation

   • LLC sublayer
   • MAC sublayer
     • Data encapsulation
       • Frame delimiting
       • Addressing
       • Error detection
     • Media Access Control

2. Ethernet Frame Fields

3. MAC Address and Hexadecimal

   • Representing Hexadecimal Values
   • Hexadecimal Conversions

4. Frame Processing

   • the address is encoded into the ROM chip permanently.

5. MAC Address Representations

   • 0-18-DE-DD-A7-B2

6. Unicast MAC Address

   • s the unique address used when a frame is sen

7. Broadcast MAC Address

   • A broadcast packet contains a destination IPv4 address that has all ones (1s) in the host portion.

8. Multicast MAC Address

   • Multicast addresses allow a source device to send a packet to a group of devices.

9. Switch Fundamentals

10. Filtering Frames

    • When the switch’s MAC address table contains the destination MAC address, it is able to filter the frame and forward out a single port.

11. Frame Forwarding Methods on Cisco Switches

    • Store-and-forward switching
    • Cut-through switching

12. Cut-Through Switching

    • Fast-forward switching
    • Fragment-free switching

13. Memory Buffering on Switches

    • Port-based Memory Buffering
    • Shared Memory Buffering

14. Duplex and Speed Settings

    • Full-duplex
    • Half-duplex
    • Duplex Mismatch

15. Introduction to ARP

    • Destination MAC address - The MAC
    • Source MAC address

16. ARP Tables

17. ARP Broadcasts

    • an ARP request is received and processed by every device on the local network.

18. ARP Spoofing

    • This is a technique used by an attacker to reply to an ARP request for an IPv4 address belonging to another device

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