CCNA4_CS.pdf

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Case Study
WANs
Cisco Networking Academy Program
CCNA 4: WAN Technologies v3.0
Overview and Objectives
This final case study shows you how to build and configure a complex network
using the skills you have acquired throughout the course. This case study is not a
trivial task, and completing it with all the required documentation will be a
significant accomplishment.
The case study scenario describes the project in general terms and explains why
the network is being built. Following the scenario, the project is then broken into
a number of phases, each of which includes a detailed list of requirements. It is
crucial that you read and understand each requirement to make sure that your
project is complete.
This case study requires that you accomplish the following:
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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, as listed in the
deliverables sections.
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1-2
CCNA 4: WAN Technologies v3.0
Copyright
2003, Cisco Systems, Inc.
Scenario
You are being asked to design and implement a network for a company that has
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; therefore, the company
requests the creation of VLANs to control broadcasts, enhance security, and
logically group users. The company also requests the use of private addresses and
DHCP throughout the WAN, so you must properly implement NAT for Internet
connectivity. Finally, the company wishes to limit Internet access to Web traffic
while allowing multiple protocols within its own WAN.
Although private addresses (RFC 1918) will be used, VLSM should be used to
minimize wasted address space for efficiency and elegance in design.
Copyright
2003, Cisco Systems, Inc.
Case Study: WANs 1-3
Phase 1: Addressing the WAN
Instructions:
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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 addressing in the tables that follow this step. This
documentation will serve as your deliverable item for Phase 1.
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Name
Limerick S0
Cork E1
Cork S0
Cork S1
Galway E0
Galway S0
Belfast E0
Belfast S0
Belfast S1
Interface/Subnet Mask
1-4
CCNA 4: WAN Technologies v3.0
Copyright
2003, Cisco Systems, Inc.
Name
Galway DHCP Pool
Cork LAN
Address Pools
Copyright
2003, Cisco Systems, Inc.
Case Study: WANs 1-5

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