NET 224: Advanced Routers and Routing

Review for First Test
  1. What OSI model layer do switches belong to? Why? What other networking devices belong on this layer?

  2. What is the effect on collision domains and broadcast domains of adding:
    • a switch
    • a hub
    • a router
    • a bridge

  3. What address data is changed on message units each time the message hops from one router to another? What address data is not changed?

  4. What is an ASIC? What do switches use them for?

  5. Explain the 80/20 rule for bridges. What setup error could cause your network to violate the 80/20 rule?

  6. A switch must make a forward/filter decision about each incoming frame. Explain the two basic outcomes of this decision.

  7. Who invented the Spanning Tree Protocol? What is the IEEE version of it?

  8. How are switches and bridges alike?

  9. What are the five states a bridge/switch port can be in? What is the purpose of each state?

  10. What is the Relay Entity?

  11. State three rules that a frame must satisfy for a bridge/switch to forward it.

  12. What is a bridging loop? What is typically done to avoid it?

  13. What is a bridge ID? What are its components? What does Cisco call the component assignable by the system administrator?

  14. What is the default priority for bridges using Cisco STP? Why shouldn't all bridges be set to this priority?

  15. What is latency with regard to switches? Which of the three types of switches described has the lowest latency? Which has the highest? Why would you use switches with higher latency, if you had a choice?

  16. Compare setting passwords on a model 1900 Catayst switch to setting them on a model 2950. Which is more like setting them on a router?

  17. What are three reasons you would want to configure IP settings on a switch?

  18. What command is used to set the IP address for a model 1900 switch?

  19. What command sequence is used to set the IP address for a 2950 switch?

  20. What command is used to restrict a port to being used by a specific MAC address?

  21. When you make changes to a 1900 switch, those changes are automatically stored in NVRAM for the next boot. How is this different on a model 2950? What must you do to save the changes?

  22. What is a VLAN? How do switches enable us to create VLANs?

  23. What effect do VLANs have on the number of broadcast domains you have? Why?

  24. How do users on one VLAN send signals to users on a different VLAN?

  25. What is the default VLAN in a Cisco network? What is its intended purpose?

  26. How does the basic protocol suite used in your network affect your VLANs?

  27. In a static VLAN environment, what happens if a mobile user plugs his laptop into the wrong data port? What happens in a well run dynamic environment?

  28. Describe the functional difference between a trunk link and an access link. Where would you expect to see each used?

  29. Frames in a VLAN typically include VLAN ID information. When is this information stripped off by switches? When is it left on?

  30. What is the switch fabric of an environment?

  31. The text describes three VLAN tagging methods. Which is proprietary to Cisco switches? Which are not proprietary? Which Cisco switch model is described as not supporting the proprietary method?

  32. What is a VTP domain? Why should we be aware of VTP domains, regarding troubleshooting?

  33. What are the three modes a switch can operate under in a VTP environment? Which is the default? Why does the text recommend a different mode when you first add a switch to a VTP domain?

  34. How do you configure a trunk port on:
    • a 1900 switch
    • a 2950 switch
    • a 3550 switch

  35. What is a subinterface? Why would a router need subinterfaces? What does the text call a router that typically needs several subinterfaces?