LOCAL AREA NETWORKS Q&A Topic 4: VLAN
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1 A. Indicate whether the sentence or statement is true or false: 1. VLANs are more flexible in handling moves and additions of ports than routers 2. VLANs logically segment the physical LAN infrastructure into different subnets. 3. VLANs logically segment the physical LAN infrastructure into different broadcast domains. 4. In a VLAN, broadcasts are only switched between ports within the same VLAN 5. VLAN configurations group users by physical association, rather than logical associations 6. A benefit of using VLANS in a network is that VLANs can talk to other VLANS directly without the need of a router 7. Frame filtering and tagging are used to logically group users into distinct VLANs -1-
2 B. Quiz questions 1. The phrase microsegmentation with scalability means which of the following? A. The ability to increase networks without creating collisions domains B. The ability to put a huge number of hosts on one switch C. The ability to broadcast to more nodes at once D. All of the above 2. Switches, as the core elements of VLANs, provide the intelligence to do which of the following? A. The group users, ports, or logical addresses into a VLAN. B. They make filtering and forwarding decisions C. They communicate with other switches and routers D. All of the above. 4. Which of the following is not an advantage of using static VLANS? A. They are secure. B. They are easy to configure. C. They are easy to monitor. D. They automatically configure ports when new stations are added. 5. Which of the following is not a criterion on which VLANs can be based? A. Port ID B. Protocol C. MAC address D. All of the above are criteria on which VLANs can be based 6. Which of the following is a beneficial effect of adding a VLAN? A. Switches do not need to be configured. B. Broadcasts can be controlled. C. Confidential data can he protected. D. Physical boundaries that prevent user groupings can he removed. 9. What device is needed for a packet to be passed from one VLAN to another? A. Bridge B. Router C. Switch D. Hub -2-
3 10. Which layer of the OSI model does frame tagging occur? A. Layer 1 B. Layer 2 C. Layer 3 D. Layer Which of the following is not a beneficial effect of adding a VLAN? A. Switches do need configuring. B. Nodes within a VLAN which are physically moved do not change network addresses. C. Confidential data can be protected. D. Physical boundaries which prevent user grouppings can be removed. 13. VLANs are more flexible in handling moves and additions of ports than routers. A. True B. False 14. Which of the following is not a benefit of VLANs? A. Multicast control B. Broadcast control C. Reduce router interfaces required D. None of the above. 15. Why create VLANs? A. Moves, adds, and changes are made simpler B. There is less administrative overhead C. The router can switch faster D. Both A and B. -3-
4 C. Concept Questions: Demonstrate your knowledge of these concepts by answering the following questions. 1. An Ethernet switch is designed to segment a LAN into individual collision domains. Explain how an Ethernet switch works. 2. VLAN technology is a cost-effective and efficient way to group network users into virtual workgroups, regardless of their physical location on the network. Explain why. 3. VLANs work at Layer 2 and Layer 3 of the OSI reference model. Explain why this is so. 4. Important to any VLAN architecture is the capability to transport VLAN information between interconnected switches and routers that reside on the corporate backbone. Why is this so important? 5. The problems associated with shared LANs and switches are causing traditional LAN configurations to be replaced with switched VLAN networking configurations. Why do VLAN configurations solve the shared LAN and switches problem? -4-
5 6. The most common approaches for logically grouping users into distinct VLANs are frame filtering, tagging, and frame identification. Explain how these approaches are used in VLANs. 7. VLANs reduce administrative costs related to solving problems associated with moves, additions, and changes. How do VLANs do this? 8. VLANs provide controlled broadcast activity. What is this? 9. VLANs provide workgroup and network security. How is this accomplished? 10. Why are VLANs less expensive to implement and what would be the alternative? -5-
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