Chapter 6: red layer

Chapter 6: red layer

1. The network layer protocols of the OSI model specify the addressing and processes that allow the network layer data packets to be assembled and transported.

2. network layer protocols

   • the network layer in communications.
     • The network layer.
       • Addressing terminals.
       • Encapsulation
       • Routing
       • Decapsulation
     • Network layer protocols
       • Internet Protocol version 4 (IPv4)
       • Internet Protocol version 6 (IPv6)
   • IP protocol characteristics.
     • IP encapsulation
       • To encapsulate the transport layer segment or other data, IP adds an IP header.
     • IP characteristics
       • Without connection
       • minimum service
       • independent of the media
   • IPv4 parking.
     • IPv4 packet header
       • Version
       • Differentiated services or DiffServ (DS)
       • Duration time (TTL)
       • Destination IPv4 address
       • IPv4 address of origin
       • Protocol
   • IPv6 package
     • IPv4 limitations
       • Exhaustion of IP addresses
       • Expansion of the Internet routing table
       • Lack of complete connectivity:
     • Introduction to IPv6
       • Largest address space:
       • Better package management:
       • The need for NAT is eliminated
     • IPv6 encapsulation
       • The IPv4 heade consists of 20 octets (up to 60 bytes if the Options field is used) and 12 basic header fields,
       • The simplified IPv6 heade consists of 40 octets (mainly due to the length of source and destination IPv6 addresses) and 8 header fields (3 IPv4 header fields and 5 header fields) additional)
     • IPv6 packet header
       • Version Traffic class: Flow label: Content length Next heading Limit of jumps: IPv6 address of origin Destination IPv6 address

3. routing

   • How to arm host routes?
     • The decision of host forwarding
       • Likewise
       • To the local host
       • To a remote I / O module:
     • Default gateway
       • routes traffic to other networks
       • has a local IP address in the same address range.
       • can carry data and forward it
     • Use of the default gateway
       • The default route is derived from the default gateway configuration and is located in the server routing table
     • Host routing tables
       • List of interfaces
       • IPv4 routes table
       • IPv6 routes table
   • Router routing tables
     • Decision to send router packets
       • Routes connected directly
       • Remote routes
       • Default route:

4. routers

   • anatomy of a router
     • A router is a computer.
       • From branch
       • WAN
       • Service provider
     • The CPU and the router OS
       • The CPU needs an OS to provide the routing and switching functions
     • Router memory
       • RAM
       • ROM
       • NVRAM
       • Flash
   • router start
     • Bootset files
       • The running configuration is modified when the network administrator performs device configurations.
     • Process of starting the router
       • Realization of the POST and loading of the boot program
       • Location and loading Cisco IOS
       • Location and loading of the configuration file

5. configuration of a cisco router

   • configuration of the initial parameters
     • Basic steps in the configuration of a switch
     • Basic steps in configuring a router
   • interface configuration
     • Configure router interfaces
       • Two Gigabit Ethernet interfaces: GigabitEthernet 0/0 (G0 / 0) and GigabitEthernet 0/1 (G0 / 1)
       • A WAN serial interface card (WIC) consisting of two interfaces: serial 0/0/0 (S0 / 0/0) and serial 0/0/1 (S0 / 0/1)
   • default gateway configuration
     • Default gateway for a host
     • Default gateway for a switch

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