Tecnologies de Xarxes D’Ordinadors
(CCNA)
CCNA 2: ROUTING PROTOCOLS AND CONCEPTS V4.0
CASE STUDY
CCNA 2: Routing Protocols and Concepts v4.0
Case Study
Overview and Objectives
This case study allows students to complete a network design, implementation, and
troubleshooting project using the skills gained in CCNA 2. Students will use the skills that have
already been developed to use, make and connect the proper cabling to the appropriate
devices.
It is crucial to read and understand the scenarios to make sure that all requirements are
fulfilled. Each scenario guides the student through the proper steps to ensure that the project
is completed properly.
This case study requires the student to accomplish the following tasks:
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Set up the physical layout of the network using the diagram and accompanying
narrative
Correctly configure the routers with a basic router configuration
Correctly configure the routing features that the design requirements describe
Troubleshoot and test the connectivity between all devices
Provide detailed documentation in a prescribed form, as listed in the deliverables
section
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CCNA 2: Routing Protocols and Concepts v4.0
Case Study
Scenario and Phase 1: Project Description
ISP
Lo2
Lo1
HQ LAN_B
Lo0
HQ LAN_A
HQ
EIGRP
AS 10
S0/1
S0/0
OSPF
PID 20
Branch1 LAN_A
S0/1
S0/0
PC 1
Fa0/0
S0/1
Branch1
S0/0
SW
Branch2 LAN
Fa0/0
PC 2
Branch2
Lo0
Branch1 LAN_B
A company has several people responsible for maintaining various sections of the internetwork
infrastructure. Many technicians have done an excellent job with the small portion for which
they are responsible.
One of the other network associates who was responsible for a larger portion of the
infrastructure suddenly left the company. This left redesign and implementation on this
portion of the internetwork unfinished. A technician is given the task to complete the design
and implementation of the unfinished network.
After taking home the documentation to study over the weekend, it is apparent to the
technician why the network associate left suddenly. The few documents that existed were
poorly written. So during the weekend the technician reconstructs the diagram above from an
existing diagram that was found. It represents the new internetwork design. It shows the
planned devices at each site.
After returning to work Monday morning, the technician presents the new diagram to the
Network Infrastructure Team Leader that assigned the project.
After discussion, it is determined that new documentation must be developed for the project.
Use the following information to implement the network.
Network address: 193.100.50.0/24
Required number of subnets: 7
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CCNA 2: Routing Protocols and Concepts v4.0
Case Study
Phase 2: IP Addressing
Now that the basic plan is in place, the team leader assigns the technician to develop a
prototype for the new internetwork. Use the network address assigned along with the
subnetting requirements, to subnet the network. From the IP addressing scheme, assign IP
addresses to the appropriate interfaces on all routers and computers in the internetwork.
Obtain approval of this phase of development from the team leader (Instructor) before
proceeding to Phase 3.
IP Addressing Requirements:
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The waste of IP addresses have to be the minimum per network assigned
Branch1 LAN_A will require 60 host IP addresses
Branch1 LAN_B will require 10 host IP addresses
HQ LAN_A will require 10 host IP addresses
HQ LAN_B will require 10 host IP addresses
Branch2 LAN will require 60 host IP addresses
The link between HQ and Branch1 will require an IP address for each end of the link
The link between HQ and Branch2 will require an IP address for each end of the link
The IP addressing allocated has to allow summarize each routing domain separately
Fill in the chart below to document the final addressing scheme:
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Assign the last IP address available to end devices
Assign the first IP address available to routers
ISP is represented as a loopback in this prototype of the final network
The link between Branch1 and Branch2 has a 194.0.0.0/30 assigned
Device
Interface
IP Address
Subnet Mask
Default Gateway
Fa0/0
N/A
Lo0
N/A
S0/0
N/A
Branch1
S0/1
194.0.0.1
255.255.255.252
Fa0/0
Branch2
HQ
S0/0
N/A
N/A
194.0.0.2
255.255.255.252
N/A
S0/1
N/A
S0/0
N/A
S0/1
N/A
Lo0
N/A
Lo1
N/A
Lo2
200.200.200.1
255.255.255.252
ISP
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CCNA 2: Routing Protocols and Concepts v4.0
PC 1
N/A
PC 2
N/A
Case Study
Phase 3: Basic Router and Workstation
Configuration
The technician is assigned to create a basic configuration on routers and workstations. The
requirements are as follows:
1. Configure router name, passwords, and banner display.
 Console Password: cisco
 Vty password: cisco
 Enable secret password: class
 Banner MOTD:
2.
3.
***************************
Welcome to <router_name> CLI.
***************************
Configure interfaces.
 Configure the IP address and subnet mask
 Configure descriptions in point-to-point interfaces:
Link <router1_name> - <router2_name>
 Configure descriptions in LAN interfaces:
LAN <LAN_name>
Configure end devices.
 Configure the IP address and subnet mask
 Configure the Default Gateway
Phase 4: Routing Configuration
The technician is assigned to configure the routing of the topology. The requirements are as
follows:
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OSPF with the Process ID 20.
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Serial0/0 and Loopback1 of HQ are inside the OSPF process.
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EIGRP with Autonomous System 10.
Branch2 propagates OSPF routing information about all its directly connected networks.
Branch2 sends and receives OSPF routing updates only through serial0/1 interface between HQ
and Branch2.
HQ sends and receives OSPF routing updates only through serial0/0 interface between HQ and
Branch2.
EIGRP activated only for the specific subnets in the domain.
Branch1 propagates EIGRP routing information about all its directly connected networks.
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CCNA 2: Routing Protocols and Concepts v4.0
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Branch1 sends and receives EIGRP routing updates only through serial0/0 interface.
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The HQ’s default gateway is ISP.
Case Study
EIGRP does not include any summarized network to NULL0 interfaces in any routing table.
Serial0/1 and Loopback0 of HQ are inside the EIGRP process.
HQ sends and receives routing updates only through serial0/1 interface.
Connection between domains:
o The connection between Branch1 and the networks inside OSPF domain requires only
one command. You have to reach Branch2 LAN, the serial link HQ-B2 and the HQ’s
Loopback1 from any host in Branch1 LANs.
The packets will pass through B1-B2 Link. A default static route is not valid.
o The connection between Branch2 and the networks inside EIGRP domain requires only
one command. You have to reach Branch1 LANs, the serial link HQ-B1 and the HQ’s
Loopback0 from any host in Branch2 LAN.
The packets will pass through B1-B2 Link. A default static route is not valid.
Branch1 and Branch2 forwards packets to HQ when they not find a match between the
destination IP address in the packet header and their routing tables (NOTE: You can only modify
the HQ’s configuration to achieve this requirement).
Phase 5: Verifying the Network
The technician has to verify if there is full connectivity in the network.
Phase 6: Documenting the Network
In order to support the network properly, documentation is required. Create documentation
that is logically organized to make troubleshooting simpler:
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show cdp neighbors
show ip interface brief
show ip route
show ip protocol
show interface <type_slot_port>
show version
show startup-config
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CCNA 2: Routing Protocols and Concepts v4.0
Case Study
Case Study Deliverables
The key lesson of this case study is the importance of thorough and clear documentation.
There should be two types of documentation completed.
General Documentation:
 A complete narrative of the project should be typed using word processing software.
Since the scenarios break up the entire task into pieces, take care to address each
scenario task so that any layperson could understand that particular task.
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Microsoft Excel or another spreadsheet program could be used to simply list the
equipment and serial numbers.
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Microsoft Visio or any paint program could be used to draw the network.
Provide documentation that specifies how the connectivity was tested.
Technical Documentation:
The technical documentation should include details of the network topology. Visio or any paint
program could be used to draw the network.
The technical documentation has to include a table or tables with the following details:
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IP addressing of all interfaces
DCE/DTE information
Router passwords
Banner MOTD
Interface descriptions
IP addressing and gateway assignments for all PCs
Router output from the following commands should be captured and placed into this
documentation (for each router):
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show cdp neighbors
show ip interface brief
show ip route
show ip protocol
show interface <type_slot_port>
show version
show startup-config
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