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Cisco Network Topologies and LAN Design

Chapter Description

This chapter from CCDA Exam Certification Guide reviews the topologies used in network design and covers the technologies and design approaches used when designing a local-area network (LAN). The hierarchical, redundant, and secure topology models are covered. Technologies like Ethernet, Fast Ethernet, FDDI, and Token Ring are also covered in this chapter. This chapter also discusses the characteristics of repeaters, bridges, switches, and routers, as well as how to apply these devices in a LAN environment. Finally, this chapter covers the Cisco products used in local-area networks.

Case Study Answers

Case Study #1: GHY Resources

  1. What issues does GHY Resources have on its Ethernet segments that may cause packet loss on the network?

    Segments are running at 45 percent utilization.

    Broadcast storms on the network.

  2. Is the LAN in Kansas City running over the recommended maximum utilization?

    No, the maximum is around 40 percent.

  3. Draw the current LAN network at the headquarters in St. Louis.

    Figure 4-22 shows a representation of the current LAN at the headquarters in St. Louis.

    Figure 4-22 Current Headquarters LAN

  4. If each sales office has less than 20 nodes but may grow to over 30, what switch would you recommend to meet the current requirements?

    Catalyst 3200 stack switch

    Catalyst 2948G switch

  5. The headquarters segments have 30 users each and will not grow to over 48 nodes. Draw out the topology for a possible solution. Update the topology with Cisco products for this building LAN that uses switched ports and Fast Ethernet media.

    Figure 4-23 shows a strong topological solution to the customer's needs.

    Figure 4-23 GHY Headquarters LAN Solution

Case Study #2: Pages Magazine, Inc.

  1. What type of media is used at Pages Magazine, Inc., locations?

  2. Unshielded twisted pair

  3. Ms. Phillips mentions that Pages Magazine's Ethernet segments are running over 40 percent utilization during peak hours of the day. What would you suggest?

    A good suggestion would be to replace the 10BaseT hubs with 100BaseT switches.

  4. Is the number of nodes at the remote sites too large?

    No. The number of nodes at each remote site is under the recommended maximum of 200 for multiprotocol networks.