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Case Study WANs Cisco Networking Academy Program CCNA 4: WAN Technologies v3.0 Overview and Objectives This final case study will allow you to build and configure a complex network using skills gained throughout the course. This case study is not a trivial task, and completing it as outlined with all required documentation will be a significant accomplishment. The case study scenario describes the project in general terms and will explain why the network is being built. Following the scenario, the project is broken into a number of phases, each of which has a detailed list of requirements. It is crucial that you read and understand each requirement to make sure that the project is complete. This case study requires that you accomplish the following: 1-2 ■ Set up the physical layout of the network using the diagram and accompanying narrative ■ Correctly configure single-area OSPF ■ Correctly configure VLANs and 802.1q trunking ■ Correctly configure Frame Relay ■ Correctly configure DHCP ■ Correctly configure NAT ■ Create and apply access control lists on the appropriate router(s) and interface(s) ■ Verify that all configurations are operational and functioning according to the scenario guidelines ■ Provide detailed documentation in a prescribed form (listed in the deliverables sections) CCNA 4: WAN Technologies v3.0 Copyright  2003, Cisco Systems, Inc. Scenario You have been asked to design and implement a network for a company with locations in four cities. Three of the locations will be connected using leased-line serial links. The fourth location (Galway) will be connected using Frame Relay because of cost considerations. The company has previously used RIP version 2 in this location and wishes to continue using it for now. However, the other three locations will use OSPF, so you must redistribute RIP routes into the OSPF routing process. One location (Cork) has a large and complex LAN, so the company wants you to create VLANs to control broadcasts, enhance security, and logically group users. The company also wants to use private addresses and DHCP throughout the WAN, so you must properly implement NAT for Internet connectivity. The company also wishes to limit Internet access to Web traffic but to allow multiple protocols within its own WAN. Although private addresses (RFC 1918) will be used, the company appreciates efficiency and elegance in design, so they have asked that VLSM be used as appropriate to minimize wasted address space. Copyright  2003, Cisco Systems, Inc. Case Study: WANs 1-3 Phase 1: Addressing the WAN Instructions: ■ Use 172.16.0.0 for internal addressing with IP subnet zero enabled. ■ Apply /30 subnets to all serial interfaces and to the link between Cork and Limerick, using the last available subnets. ■ Assign an appropriately sized subnet for the DHCP pool on the Galway LAN, which has 512 devices. ■ Assign an appropriately sized subnet for the Cork LAN, which has 750 devices. ■ Document all of your addressing in the tables below. This documentation will serve as your deliverable item for Phase 1. Name Interface/Subnet Mask Limerick S0 Cork E1 Cork S0 Cork S1 Galway E0 Galway S0 Belfast E0 Belfast S0 1-4 CCNA 4: WAN Technologies v3.0 Copyright  2003, Cisco Systems, Inc. Belfast S1 Name Address Pools Galway DHCP Pool Cork LAN Copyright  2003, Cisco Systems, Inc. Case Study: WANs 1-5 Phase 2: Configuring the routers and OSPF Instructions: ■ Configure each router with a hostname and passwords. ■ Configure each interface on the four routers documented in Phase 1. ■ Configure OSPF on the Cork, Limerick, and Belfast routers. ■ Configure RIP and redistribute through the OSPF tables. ■ Verify that the Limerick, Belfast, and Cork routers have connectivity through Layers 1-7. ■ Capture and save the four router configuration files. Edit the text files, and include comments at the top of each file documenting the following: – Your name – The date – CCNA4 Case Study – Phase 2 – The router name that corresponds to each file. This documentation will serve as your deliverable item for Phase 2. 1-6 CCNA 4: WAN Technologies v3.0 Copyright  2003, Cisco Systems, Inc. Phase 3: Configuring NAT, frame relay simulation, and ACLs Instructions: 1. The Belfast router will perform NAT. Configure the Belfast router as follows: – – – 2. Define the NAT pool. The pool consists of only one address: the public address 192.168.1.6/30. Define an access control list, which will permit traffic from all internal (172.16.0.0/24) addresses, and deny all other traffic. Establish dynamic source translation, specifying the NAT pool and the ACL defined in the previous steps. – Specify the inside and the outside NAT interfaces. – Change the default NAT timeout value to 120 seconds. Connect a workstation to Belfast’s E0 port to simulate an ISP server. Configure this workstation as follows: – Configure the IP address and subnet mask as 10.0.0.2/8. – Configure the default gateway. – Copyright  2003, Cisco Systems, Inc. Configure the workstation to act as a web server. Create a simple web page that will tell users that they have reached the ISP. Case Study: WANs 1-7 3. Configure the Frame Relay simulator as follows: – – Configure S0 on both the Cork router and the Galway router to use Frame Relay encapsulation. Configure the router between Cork and Galway to simulate a Frame Relay switch. 4. Configure an ACL to filter traffic from source addresses on the Galway LAN. The ACL should permit HTTP access to the ISP, deny all other access to the ISP, and permit all traffic to destinations within the WAN. 5. Recapture and save the Belfast, Cork, and Galway router configuration files. Capture and save the Frame Relay switch router configuration file. Edit the text files, and include comments at the top of each file documenting the following: – Your name – The date – CCNA4 Case Study – Phase 3 – The router name that corresponds to each file. Document your NAT configuration and your ISP Server configuration in the chart below. This documentation will serve as your deliverable item for Phase 3. Item Configured Values Belfast: Name of NAT Pool Belfast: ACL Number ACL Number for ACL Filtering Galway LAN Traffic Router for ACL Filtering Galway LAN Traffic Configured Port for ACL Filtering Galway LAN Traffic Configured Direction for ACL Filtering Galway LAN Traffic ISP Server IP Address ISP Server Subnet Mask ISP Server Default Gateway Filename of web page on ISP Server (include path) 1-8 CCNA 4: WAN Technologies v3.0 Copyright  2003, Cisco Systems, Inc. Phase 4: Configuring VLANs and DHCP Instructions: 1. Configure the Cork Local Area Network switch as follows: 2. – Create three VLANs. – Assign ports 1-4 to VLAN1. – Assign ports 5-8 to VLAN2. – Assign ports 9-12 to VLAN3. – Connect E1 of the Cork router to a VLAN1 port. – Connect a workstation to each VLAN. – Configure the workstations with appropriate IP addresses. The Galway router will perform DHCP. Configure the Galway router as follows: – 3. Using the DHCP pool documented in Phase 1, configure E0 with the first useable address. – Configure the DHCP pool on the router. – Connect a workstation to E0 on Galway. – Configure the workstation to obtain its IP address automatically. Recapture and save the Galway router configuration file. Edit the text file, and include comments at the top documenting the following: – Copyright  2003, Cisco Systems, Inc. Your name Case Study: WANs 1-9 – The date – CCNA4 Case Study – Phase 4 – Galway router This documentation will serve as your deliverable item for Phase 4. 1-10 CCNA 4: WAN Technologies v3.0 Copyright  2003, Cisco Systems, Inc.