CCNA IPv6 Lecture Notes

Introduction

• Comprehensive free course for CCNA certification
• Video focuses on finalizing IPv6 studies for the CCNA exam
• Static routing concepts applied from IPv4 to IPv6
• Reminder: Continue to use IPv6 in future labs and examples

Correction on IPv6 Address Representation

• Misrepresentation of IPv6 addresses in previous videos
• RFC 5952 standardizes IPv6 representation:
  • Leading 0s must be removed
  • Use double colon for the longest string of all-0 quartets
  • Hexadecimal characters a-f must be in lower-case

IPv6 Header Overview

• Simpler than IPv4, fixed size 40 bytes
• Fields:
  • Version: 4 bits, always set to 6 for IPv6
  • Traffic Class: 8 bits, used for QoS
  • Flow Label: 20 bits, identifies specific traffic flows
  • Payload Length: 16 bits, length of encapsulated L4 segment
  • Next Header: 8 bits, type of next header (TCP/UDP)
  • Hop Limit: 8 bits, decrements with each hop
  • Source & Destination Address: 128 bits each

Neighbor Discovery Protocol (NDP)

• Replaces ARP for IPv6
• Uses ICMPv6 for ARP-like functions:
  • Neighbor Solicitation (NS) and Neighbor Advertisement (NA)
  • More efficient than broadcast ARP messages
• Solicited-Node Multicast Address: ff02::1:ff + last 6 hex digits of unicast address
• Routers also use Router Solicitation (RS) and Router Advertisement (RA)

SLAAC (Stateless Address Auto-configuration)

• Uses RS and RA to learn IPv6 prefix of local link
• Automatically generates IPv6 address
• Uses EUI-64 or random generation for interface ID

IPv6 Static Routing

• Similar to IPv4 but separate processes and routing tables
• IPv6 routing must be enabled (IPv6 UNICAST-ROUTING)
• Types of Static Routes:
  • Directly Attached: exit interface specified
  • Recursive: next-hop address specified
  • Fully Specified: both exit interface and next hop
• Special Note:
  • Directly attached static routes do not work on Ethernet interfaces in IPv6

Key Concepts for CCNA Exam

• Network, Host, Default, Floating Routes
• Recursive, Fully Specified, Directly Attached Routes
• Link-Local addresses need both next-hop and exit interface for static routes

Quiz Review

• NDP message types: NS, NA, RS, RA
• Differences between static route types
• Configuring IPv6 routes on routers

Bonus Practice Question

• Scenario-based troubleshooting of IPv6 routing issues

Additional Resources

• Flashcards with Anki software
• Packet tracer lab for hands-on practice
• Encourage engagement on video platform