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ITET1 Routing DL and physical layers.odp
 

ITET1 Routing DL and physical layers.odp

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    ITET1 Routing DL and physical layers.odp ITET1 Routing DL and physical layers.odp Presentation Transcript

    • Data link and physical layers
    • OSI model The lower layers
      • Hardware addresses
      • Cables and wifi
    • Repetition
      • Connection between the client PCs?
      • Connection between Clint PC and ext. PC?
    • Inside a subnet
      • Check destination IP
      • If local, get MAC address ass. to IP of dest.
      • Send data using dest MAC
    • Through routers
      • Check destination IP
      • If not local, get MAC address ass. to GW
      • Send data using GW MAC
    • Arp cache New entry
    • Exercise
      • Use wireshark to
        • Find the MAC address of the gateway
        • Find other MAC addresses
      • Query your local ARP database
        • Use 'arp'
    • On the wire
    • MAC addresses
      • Hardware address
      • IEEE 802.3
        • Cables ethernet
        • 10/100/1000 Mbps
        • CSMA/CD
      • IEEE 802.11 b/g/n
    • Switch
      • “Link layer switch”
      • Self learning
      • Uses MAC address
    • Exercise
      • Compare
        • Routers
        • Switches
        • Hubs
        • Repeaters