CST3607 Class Notes 2021-11-09

News & Tools


  • At this point in the semester, you should be confident in your understanding of Cisco IOS, routing protocols, etc., to complete Lab-04 (OSPF, Serial, DHCP), using only the network diagram as your guide, with 100% accuracy, in less than 30 minutes.
  • If that’s not the case, then you must practice, practice, practice, to gain the necessary skills and confidence.
  • Practice makes improvement.

VLAN (Virtual Local Area Network)

  • VLAN 1 is the default Ethernet VLAN
  • VLANs 1002 through 1005 are automatically created and cannot be deleted
  • What are the maximum number of VLANs, including the reserved VLANs?
  • Trunking
    • What is the purpose of a Trunk port?
  • IEEE 802.1Q Encapsulation

InterVLAN Routing

  • A Stub router, One-armed router or Router on a Stick (RonS) is a router configured to route traffic between virtual local area networks (VLANs).
  • It has only a single Ethernet NIC that is part of two or more Virtual LANs, enabling them to be joined.
  • The physical interface is divided into logical interfaces (known as sub-interfaces), one for each VLAN, configured as trunk interfaces.
  • Search: Router on a Stick

SVI (Switched Virtual Interface)

  • A Switch Virtual Interfaces (SVI) represents a logical Layer 3 interface on a switch.
  • VLANs divide broadcast domains in a LAN environment. Whenever hosts in one VLAN need to communicate with hosts in another VLAN, the traffic must be routed between them. This is known as inter-VLAN routing. On Layer 3 switches it is accomplished by the creation of Layer 3 interfaces (SVIs).

VLAN Diagnostic Commands

  • S1# show vlan
  • S1# show vlan brief
  • S1# show interface trunk
  • S1# show interfaces switchport
  • S1# show interface fa0/15 switchport
  • S1# show running-config
  • S1# show arp
  • S1# clear arp

VLAN Resources

Read / Watch / Do

CCNA Certification Study Guide, Volume 2

  • Read Chapter :
  • Do the Written Labs
  • Answer the Review Questions
    • Do not submit your answers for this chapter. The answers are in Appendix.

Study for Exam 2

Better Focus and Efficient Studying When Not Multitasking