Network layer

Network layer

1. Terminal Addressing

2. Encapsulation

3. Routing

4. Decapsulation

5. Network layer protocols

6. IP encapsulation

7. IP features

   • Without connection
   • minimum service
   • media independent

8. communication without connection

   • issuer doesn't know
   • receiver does not know

9. IPv4 packet header

   • Versión
   • Differentiated services or DiffServ (DS)
   • Duration time (TTL)
   • Protocol
   • Source IPv4 Address
   • Destination IPv4 Address

10. IPv4 limitations

    • Depletion of IP addresses
    • Internet routing table expansion
    • Lack of complete connectivity

11. Introduction to IPv6

    • Greater address space
    • Better package handling
    • The need for NAT is eliminated
    • IPv6 encapsulation
    • IPv6 packet header
      • Versión
      • Traffic class
      • Flow label
      • Content Length
      • Next Header
      • Jump Limit
      • Source IPv6 Address
      • Destination IPv6 Address

12. The host forwarding decision

    • Likewise
    • To the local host
    • To a remote I / O module

13. Default gateway

14. Host routing tables

    • Interfaces list
    • IPv4 route table
    • IPv6 route table

15. Router packet delivery decision

    • Routes directly connected
    • Remote routes

16. Remote routes

17. A router is a computer

    • Branch
    • WAN
    • Service provider

18. The router's CPU and OS

    • RAM
    • ROM
    • NVRAM
    • Flash

19. Interfaces WAN y LAN

    • Console
    • Shell seguro (SSH)
    • Telnet