Case Study 1 Answers Cicala and Rosado Law Firm

1 What can be said about the network health of the Ethernet and WAN segments?

The network health is poor. Ethernet network utilization over 40 percent is not recommended. WAN links over 70 percent utilization should be upgraded to higher speeds.

2 Sketch the current network.

Figure 9-4 shows the existing Cicala and Rosado law firm network. Figure 9-4 Cicala and Rosado Law Firm Existing Network

Cisco 2500

Concentrator 10 Mbps

Cisco 2500

Concentrator 10 Mbps

Concentrator 10 Mbps

Concentrator 10 Mbps

3 What applications are being used?

Microsoft Office suite applications, WWW and HTTP applications, and CD-ROM servers.

4 What would you recommend to alleviate the WAN utilization problem?

To overcome the utilization problems on the WAN link, upgrade the link to 256 Kbps and then monitor the utilization of the network.

5 What would you recommend to improve the LAN utilization problem? What switches could you use?

Because the clients have been equipped with 10/100 NIC, replace the 10 Mbps hubs with Fast Ethernet switches. The switches will also provide a separate collision domain to each device.

You could use two Cisco 2948 switches at each site, providing 96 ports for network devices.

6 What Cisco device could be used to provide protection from the Internet?

The Cisco PIX Firewall can be used to provide additional security from the Internet. The PIX Firewall provides stateful inspection of conversations and can be used for network address translation.

7 What Cisco devices could be used to provide an integrated voice and data solution? Cisco 3600 series routers provide a Voice over IP solution.

8 Would you suggest a full CiscoWorks 2000 solution with HP OpenView on a Unix workstation to Mr. Kunkel?

Because Mr. Kunkel's staff is already overworked, learning new Unix skills might not be an option. They already run NT servers, so recommend CiscoWorks for Windows as a network management solution.

9 The firm's network is small. Would you propose a pilot or a prototype to demonstrate the VoIP solution?

Because this is a small network with only two sites, recommend a pilot demonstration.

10 Mr. Kunkel hands you the following IP subnet information:

Company network: 223.10.1.0, mask: 255.255.255.192

Houston LAN: 223.10.1.0/26

Dallas LAN: 223.10.1.64/26

WAN link: 223.10.1.128/26

Case Study #1 Answers: Cicala and Rosado Law Firm 327

What routing protocol would you recommend, and how would you change the addressing scheme?

You should recommend using a routing protocol that can do VLSMs. Possible options are RIPv2, OSPF, and Enhanced IGRP. Because both routers are Cisco, Enhanced IGRP would be most efficient. You need to place the power users with the CD-ROM servers onto another segment.

Houston main LAN: 223.10.1.0/26

Houston server LAN: 223.10.1.128/27

Dallas LAN: 223.10.1.64/26

WAN link: 223.10.1.224/30

11 Draw the proposed network solution.

Figure 9-5 shows the proposed Cicala and Rosado law firm network.

Figure 9-5 Cicala and Rosado Law Firm Proposed Network Solution

Figure 9-5 Cicala and Rosado Law Firm Proposed Network Solution

Server LAN Main LAN

Server LAN Main LAN

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