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1. | Which of the following are advantages of hierarchical design? (Choose all that apply.)
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2. | Which of the following are layers in Cisco’s three-layer hierarchical design? (Choose all that apply.)
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3. | Which of the following should be included at the core layer? (Choose all that apply.)
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4. | How many layers of hierarchy should you add below the access layer?
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5. | Which of the following are permitted at the distribution layer? (Choose all that apply.)
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6. | Which of the following are generally associated with the core layer of the network? (Choose all that apply.)
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7. | Which of the following are modules in the Enterprise Campus functional area of the Enterprise Composite Network Model? (Choose all that apply.)
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8. | Which of the following methods will allow IP workstations to dynamically locate routers? (Choose all that apply.)
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9. | You need to add a new site to your hierarchical network. Which of the following are possible places to connect the new site into your existing network?
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10. | When designing fault-tolerant network topologies, which of the following can DDR accomplish? (Choose all that apply.)
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11. | Select the topology in which it is easiest to troubleshoot connectivity issues.
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12. | Which three of the following are functional areas of the Enterprise Composite Network Model?
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13. | You have a T1 link from an access layer router to a distribution layer router and a BRI DDR connection to another distribution layer router. The DDR is configured to run in case of failure. Which of the following do you have?
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14. | Which of the following are advantages of Layer 3 switching over Layer 2 switching in the core of a network? (Choose all that apply.)
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15. | You have two routers that will be participating in HSRP. How many IP and MAC addresses will the workstations use for their default router?
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16. | What is the problem caused during IP load balancing by routing protocols that use hop count as a metric?
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17. | You have a T1 link from an access layer router to a distribution layer router and a BRI DDR connection to another access layer router. The DDR is configured to run in case of failure. Which of the following do you have?
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18. | How can redundant links be added into a hierarchical design without breaking the hierarchy?
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19. | Your customer has a hierarchical network design. Redundancy and reliability are most important at which layer?
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20. | In general, at which layer of Cisco’s hierarchical model are functions such as packet filtering, route summarization, and routing protocol redistribution performed?
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Answers
1. | E All of the answers are advantages of hierarchical design and provide many benefits when managing and troubleshooting networks. |
2. | B, D, E Cisco’s three-layer hierarchical model is made up of the core, distribution, and access layers. These three layers are not always clearly defined within each and every network design, but they serve as a guideline. |
3. | C, D The core layer is responsible for high-speed traffic flow and redundancy. |
4. | A The access layer where users connect is the bottom layer and should not have any other layers below it. |
5. | A, B, C, D, E All of these traffic-management technologies are usually implemented at the distribution layer, but they can extend into the access layer. |
6. | B, C The core layer is concerned with capacity and fault tolerance. Packet filtering and security are generally implemented at the distribution layer. |
7. | B, C The four modules of the Enterprise Campus functional area are Campus Infrastructure, Network Management, Server Farm, and Edge Distribution. Enterprise Edge is a separate functional area, not a module of the Enterprise Campus functional area. |
8. | B, D Proxy ARP is used by IP workstations, while IPX and AppleTalk workstations listen for routing protocol updates, or they request them from the network. |
9. | B You should avoid changing the diameter and consistency of the core layer, and the access layer is for “local site” client access. |
10. | A, D, E Floating routes and OSPF demand circuits allow DDR to bring up a second link in the event of routing problems. |
11. | C One of the main design purposes of hierarchical networks is troubleshooting. The other purpose is network management. |
12. | A, D, E The three functional areas of the Enterprise Composite Network model are Enterprise Campus, Enterprise Edge, and Service Provider Edge. |
13. | B From a single access layer router, multiple distribution layer connections provide for fault tolerance. |
14. | A, D, E Layer 3 switching aids in broadcast control, load balancing, and router peering. |
15. | B The advantage of HSRP is that the clients never need to change their default router configuration, even when a router failure occurs. They are always configured to use the phantom router IP and MAC addresses. |
16. | A RIP and IGRP use hop count as a metric and cannot detect links of different speeds. Consequently, they can’t detect when redundant links are unequally used. |
17. | E You have broken the hierarchical model by connecting two access layer routers. |
18. | B A full mesh addition would break the hierarchy and create a flat network design. |
19. | D The core layer affects all other layers in the hierarchical network design, so redundancy and reliability are crucial at this layer. |
20. | B Packet filtering, route summarization, and redistribution are generally handled at the distribution layer. |
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