Case Study 3 Answers Cartoon Works

1 List the new applications that the customer wants to implement in the network. Video conferencing

Novell Internet e-mail system Web servers SQL database DNS Server

2 Draw a logical diagram of the existing network.

The customer defined the network by describing the geographical locations and the services that the network provides its users. The logical diagram in Figure 9-6 is based on those services.

3 What type of WAN technology would you recommend as a redundant solution for the T1 between CartoonWorks offices?

Suggest an ISDN dial-up connection to begin with until it is determined that the client has a higher than 256K backup solution. This would require an assessment of the traffic and bandwidth utilization on the T1. However, the ISDN equipment and line are both cost-effective and can be implemented quickly.

4 What CartoonWorks services depend on the DNS server in this network?

The e-mail system depends on the DNS server because it requires a mail exchange record for Internet mail services. Web servers depend on the DNS server for name resolution. Web browsers also depend on the DNS server for name resolution.

5 If the client were given a valid address of 199.199.199.32 with a mask of 255.255.255.224 from its ISP, what solution would you recommend to give all CartoonWorks' users access to the Internet?

CartoonWorks plans to give Internet access to all its 200-plus users. The address range that the ISP had provided is not sufficient for the company's network size, so it needs to use Network Address Translation (NAT).

Figure 9-6 Logical Diagram of the Existing CartoonWorks Network

Web Servers

Figure 9-6 Logical Diagram of the Existing CartoonWorks Network

Web Servers

Internet Access Router

Main Street Network

Internet Access Router

Main Street Network

Novell 4.11 Primary NDS User Directories

GroupWise

Main Street Router . /-1

Main Street Router . /-1

Novell 4.11 Secondary NDS IT

Oak Street Router

Novell 4.11 Accounting Human Resources Corporate

Oak Street Router

Novell 4.11 Accounting Human Resources Corporate

Macintosh Computers

Novell 4.11 Secondary NDS IT

Novell 4.11 Marketing Production

Oak Street Network

Novell 4.11 Marketing Production

Macintosh Computers

Oak Street Network

70—100 User PCs

Case Study #4 Answers: Martin and Martin, LLC 331

6 During the process of characterizing the network, you have found the following:

— Broadcasts are 17 percent of total traffic.

— There are 100 mixed-media workstations.

— Utilization on the segment is at 30 percent.

What would you recommend to the customer to improve the performance on this network?

Segmenting the flat network would be recommended based on the findings. The threshold for broadcasts is that broadcasts should be less than 20 percent of the total traffic. This means that a Layer 3 segmentation needs to occur to isolate the broadcast traffic. Therefore, a recommendation for creating VLANs with Catalyst switches would provide the Layer 3 segmentation and also reduce collision domains.

7 What are the routed protocols used in this network? IPX, AppleTalk, and IP

8 What would you recommend to use as routed protocols in the new network, and why?

The client will need to implement IP to support the NT applications and the Web-based applications. However, the customer does not describe any plans to change the graphical or file systems. Therefore, the network would also include IPX and AppleTalk.

9 Which routing protocol can be used to support all the routed protocols of the new network?

Because the new network includes IP, IPX, and AppleTalk, the recommendation should be for using Enhanced IGRP. Enhanced IGRP supports all the above-mentioned routed protocols.

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