Layer 2 (Big MAC)

The Data Link Layer  - I love this tasty layer....so beautifully simple 😁

Leah and I are chill'in at the Grizz...nothing better than a cap and a MAC lesson

• Frames are encoded and decoded into Bits at Layer 2
• Error detection and correction for the Physical layer can be provided here
• Ethernet is king of layer 2

• Ethernet uses 48-bit hex MAC Addresses
• The first 24 bits are OUI (Organizationally Unique Identifier) assigned my IEEE
• Vender assigns last 24; every address is globally unique; 281 trillion possibilities 2⁴⁸
• Example:  00:60:C2:C0:00:09

Here are some other common Layer 2 protocols:

• ARP  Address Resolution Protocol
• ATM  Asynchronous Transfer Mode
• CDP   Cisco Discovery Protocol
• FDDI  Fiber Distributed Data Interface
• Frame Relay
• Multi-link Protocol
• PPP    Point-to-Point Protocol
• STP   Spanning Tree Protocol
• VTP   VLAN Trunking Protocol
• VLAN  Virtual Local Area Network

  https://en.wikipedia.org/wiki/List_of_network_protocols_(OSI_model)