Ccna3 Case Study

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  • Topic: Ethernet, Network switch, Spanning tree protocol
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  • Published : February 25, 2011
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Cisco Networking Academy Program

CCNA3: LAN Switching and Wireless

Case Study

Student names:

Suarez, Enrico Joaquin L.
Hernandez, Francis Carlos P.
Dolores, Joi Mel M.
Del Rosario, Dominique Frances T.
Manat, Marc lester T.
Tanada, Ma. Alvina S.

Submitted to:

Engr. Christie R. Valero

Dec 3, 2010

Overview and Objectives

To enhance the Learner’s knowledge of switching and wireless networks.

The following case study is used to illustrate the process required for designing a redundant switched network. This case study presents a scenario in which XYZ Insurance Company has hired a Network Consultant Group to design their network. In order to help you organize this project, the scenario has been divided into phases listing the requirements for each task.

• Configure security via VLANs and propagate with VTP.

• Design a redundant switched network.

• Configure switch port VLAN information and port security

• Connect and verify connectivity to a wireless router

• Configure the IP settings of a Linksys wireless router

• Configure DHCP on a Linksys wireless router

• Change the network mode and corresponding network channel on a wireless router

• Enable WEP encryption and disable SSID broadcast.

• Enable a wireless MAC filter if available.

• Configure access restrictions on a wireless router if available.


XYZ Insurance Company requires 24/7 access to the Internet in order to service its clients. You have been retained to design a network which meets these requirements. In order to achieve this, you have decided to develop the design in stages proving each stage on the way. In addition some users within your company are provided with wireless laptops and are allowed to log onto the company’s local area network in a secure fashion. Two wireless routers are provided for this for security and the Sales staff will be shared between them. Unauthorized wireless laptop users must be denied access in order to preserve security.


The company has 3 main departments – Personnel, Finance and Sales. The offsite sales team are provided with laptops and, when in the head office, are regarded as part of the Sales Department. Your design must provide for • 8 employees in the Personnel department.

• 17 employees in the Finance department.
• 5 wired workstations and 5 wireless workstations for internal Sales staff. • 100 laptops for external mobile Sales staff. .
• Lifetime max of 2 servers for each department regardless of company growth. • Expect 100% growth of current IP requirements when determining size of subnets. • All networking devices must have IP addresses.

• Use the private class B 172.XX.0.0 network for internal addressing. Where XX: 16 – group 119 – group 4
17 – group 220 – group 5
18 – group 3 21 – group 6
• Use VLSM for IP addressing.
• Use subnet for connection to the Internet via a router. • There is a DNS server at address connected to the router. • A redundant switched network using a layered design is required with one router for access to the internet. (Two routers would be needed in the final analysis).

Phase 1 – Network Design

To meet the requirements the eventual topology is shown below;

1. Produce a logical diagram based on the above diagram for the LAN for XYZ Insurance Company that includes: ▪ Router and switch names
▪ VLAN names and details
▪ Network addresses
▪ Number of hosts per network
▪ Link Speeds
The next few sections have example grids for documenting this information.

2.The company expects the use of VLSM Design to maximize the use of IP addresses. A table is to be produced...
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