CCNA v1.1: IPv6

IPv6 Advanced features include:

Larger address space:

  • Global reachability and flexibility
  • Aggregation
  • Multihoming
  • Autoconfiguration
  • Plug-and-play
  • End-to-end without NAT
  • Simplified renumbering

Mobility and Security:

  • Mobile IP is RFC-compliant
  • IPsec mandatory (or native) for IPv6

Simpler Header:

  • Routing efficiency
  • Performance and forwarding rate scalability
  • No broadcasts
  • No checksums
  • Extension headers
  • Flow labels

Transition richness:

  • Dual stack
  • Tunneling (including 6to4 and manual tunnels)
  • Translation

IPv4 versus IPv6 Addresses

IPv4 Addressing is 4 octets or 32 bits long IPv6 Addressing is 16 octets or 128 bits long
Usually written in dotted decimal, for example: 192.168.128.129 Usually written in hex with colons in between each 16 bots, for example: D1DC:C971:D1DC:CC71:D1DC:D971:D1DC:C971
Binary example:
11000000.10101000.10000000.10000001
Binary example:
11010001.11011100.11001001.01110001.
11010001.11011100.11001100.01110001.
11010001.11011100.11001001.01110001.
11010001.11011100.11001001.01110001
4,294,467,295 IPv4 Addresses 3.4 x 1038 IPv6 addresses

IPv4 versus IPv6 Header

IPv6 Address Types

  • Unicast
    • Address for a single interface
    • Several types including:
    • Global aggregatable, 2000::/3
    • Loopback, ::1/128
    • Link-local, FE80::/10
    • Unspecified, ::
  • Multicast
    • One-to-many; enables more efficient use of the network
    • FF00::/8
  • Anycast
    • One-to-nearest (allocated from unicast address space)
    • Multiple devices share the same address; all anycast nodes should provide uniform service
    • Source devices send packets to anycast address; routers decide on closest device to reach that
      destination
    • Suitable for load balancing and content delivery services

IPv6 Address Assignment

  • Static
    • With manual interface ID
    • With EUI-64 format interface ID
  • Dynamic
    • Stateless autoconfiguration
    • DHCPv6

IPv6 Routing Protocols

  • Static
  • RIPng (RFC 2080)
  • OSPFv3 (RFC 2740)
  • IS-IS for IPv6
  • MP-BGP4 (RFC 2545/2858)
  • EIGRP for IPv6

Next week we’ll review Ethernet.

Excerpted and available for download from Global Knowledge White Paper: CCNA v1.1 Exam Review: Critical Concepts of the 640-802 CCNA Exam

Resources:
CCNA Cert Check
CCNA Exam Prep Mobile App

Related Courses:
ICND1 — Interconnecting Cisco Network Devices 1
ICND2 — Interconnecting Cisco Network Devices 2
CCNAX — CCNA Boot Camp v1.1

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