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Study Tips

  • VLAN provides logical grouping of the hosts to restrict the broadcast domain.
  • VLANs are usually categorized into local and end-to-end VLANs, and each has its own pros and cons.
  • With the help of trunking, VLANS can be easily extended over a single physical link.
  • ISL and 802.1Q are two trunking protocols, with dot1Q the industry standard.
  • Dot1Q frames insert 4 bytes and recalculate the CRC.
  • Native VLAN is not encapsulated in dot1Q trunking, and it is important to have same native VLAN on both sides of the switches.
  • VTP is used to distribute VLAN databases. It has multiple versions and modes. VTP works in server, client, and transparent mode.
  • Any switch with a higher revision number can overwrite the VLAN database. Insert the new switch with caution and follow the recommended steps.
  • EtherChannel is a technology that was originally developed by Cisco as a LAN switch-to-switch technique of grouping several Fast or Gigabit Ethernet ports into one logical channel.
  • PagP and LACP are the two main protocols for EtherChannel.
  • For EtherChannel, it is highly recommended to use the even number of ports in the channel to have better load balancing.
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