Level 2 (and 1 :)

Characteristics

• Geography
• LAN (Local)
• MAN (Municipal/Metropolitan)
• WAN (Wide)
-> Delay
• Topology
• Point-to-Point
• Bus
• Ring
• Star
-> Physical or Logical
• Reservations
• In Advance
• Ad Hoc
• Contention-Based

Specific Technologies

PPP/Serial Lines

Ethernet

• Evolution
• Aloha
• CSMA
• CSMA/CD
• 10base2, 10base5
• Repeaters
• 10baseT
• Bridges
• Switches
• Fast Ethernet
• Gigabit Ethernet
• Addressing
• IP and Ethernet (ARP)

FDDI

Frame Relay/ATM