Linux and Windows ping each other
Network Systems

CCNA1 Module 8: Network Layer

This is part of the CCNA1 Introduction to Networks course. This page will be updated with texts in the future… for now, please refer to my lecture on my YouTube channel.


IPv4 Router Routing Tables

Sample IPv6 Headers in Wireshark

CCNA – Sample IPv4 Headers in Wireshark

Summary of the Module 8

  • IP is connectionless, best effort, and media independent.
  • IP does not guarantee packet delivery.
  • IPv4 packet header consists of fields containing information about the packet.
  • IPv6 overcomes IPv4 lack of end-to-end connectivity and increased network complexity.
  • A device will determine if a destination is itself, another local host, and a remote host.
  • A default gateway is router that is part of the LAN and will be used as a door to other networks.
  • The routing table contains a list of all known network addresses (prefixes) and where to forward the packet.
  • The router uses longest subnet mask or prefix match.
  • The routing table has three types of route entries: directly connected networks, remote networks, and a default route.