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Design Scenario

The city of Mapleland, Oregon, which owns and operates its own power utility, built a

fiber-optic network to monitor power meters at residents homes. The network is

called Mapleland Fiber Network (MFN). Because MFN had more capacity than was

needed to monitor meters, the city expanded its services to offer access to the network

for city businesses. The businesses use the network to communicate with each other

and to access the Internet. At the MFN headend, which is located with the citygovernment offices, three routers and WAN links connect to the Internet for use by

the city. The businesses on MFN also use these routers to reach the Internet.

In addition to the business service, MFN also offers cable modem service to homes. A

cable modem router at the MFN headend connects to the fiber-optic network. In the

city neighborhoods, hybrid fiber-coax nodes bring coax cabling to each street and into

the homes for cable modem Internet access.

The MFN backbone consists of a fiber-optic Gigabit Ethernet network that runs

through the city in a ring topology. The fiber-optic ring connects the hybrid fiber-coax

nodes that bring coax cabling to each neighborhood. Also connected to the ring aresix data routers. Each router links one or more Mapleland businesses to MFN via

simple point-to-point connections. At the business, the fiber-optic network enters the

building and connects to a media converter. A UTP cable connects to the media

converter and typically to a 100-Mbps Ethernet switch. The switch links the

businesss computers and servers in a star topology via UTP cabling.

1. Draw a network map that shows the topology of the MFN and how the

main components are connected.

2. What other information would you gather to improve your map and addmore detail?

3. Mapleland is considering expanding the MFN to include wireless access for

its residences. What additional investigation will you do to prepare for a

citywide wireless network?

4. What security concerns do you have for the wireless network?

Subject: ICT319 Network Design Project

Oppenheimer, P. 2010, Top-Down Network Design, CISCO PressChapter 3 and 4

Design Scenario

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Hands-On Project

The chapter mentioned using a protocol analyzer to characterize a network. Download

and install the Wireshark protocol analyzer fromwww.wireshark.org. Unless you

signed an Acceptable Use Policy (AUP) document that disallows this, capture traffic

from your live business or school network. (If you have signed an AUP that disallowscapturing network traffic, capture from your home network instead.) Answer the

following questions.

1. In Wireshark, go to Statistics > Summary. What is the Average Mbps?

2. Go to Statistics > Protocol Hierarchy. Which protocols use most of the

bandwidth?

3. Go to Statistics > Packet Lengths > Create Stat. What percentage of packets

are less than 80 bytes? What percentage of packets are 801279 bytes?What percentage of packets are larger than 1279 bytes?

4. Capture network traffic while accessing a website with your web browser.

In Wireshark, go to Statistics > HTTP > Packet Counter >Create Stat. How

many Response Packets did you capture? What types of Response Packets

and how many of each type did you capture?

http://www.wireshark.org/http://www.wireshark.org/http://www.wireshark.org/http://www.wireshark.org/