Case Study
WANs
Routing & Switching:
Connecting Networks
Overview and Objectives
This final case study allows students to build and configure a complex network
using skills gained throughout the course. This case study is not a trivial task. To
complete 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 important
to read and understand each requirement to make sure that the project is
completed accurately.
The following tasks are required to complete this case study:
 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 the two Point to Point links with PPP encapsulation,
CHAP Authentication over one link and PAP over the second link.
 Correctly configure a GRE Tunnel
 Correctly configure routing
 Correctly configure DHCP
 Correctly configure NAT
 Create and apply access control lists (ACL’S) on the appropriate
routers and interfaces
 Test/Verify and document that all devices are operational and
functioning according to the scenario guidelines
 Provide detailed documentation in a prescribed form as listed in
the deliverables sections
Scenario
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
PPP Link
PAP
Limerick
G0/0
VLA
N
2
VLAN
3
VLAN
4
VLAN
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
A company needs a network to be designed and implemented; the company 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 and the fifth
location (Derry) will be connected using a VPN due to cost considerations. The
company has previously used RIP version 2 at the Galway location and wishes to
continue using it for now. However, the other four locations will use OSPF. So RIP
routes must be redistributed into the OSPF routing process and RIP networks must be
reached from the OSPF routing. Also, OSPF networks must be reached from the Galway
networks through default static route.
One location, Cork, has a large and complex LAN. Due to the size and complexity, the
company wants to create VLANs to control broadcasts, enhance security, and logically
group users. The company also wants to use private addresses throughout the
Autonomous System, DHCP over most of the LAN segments, and NAT implemented for
Internet connectivity. The company also wishes to limit Internet access to Web traffic
while allowing multiple protocols (not all) within its own WAN.
Although private addresses (RFC 1918) will be used, the company appreciates
efficiency and address conservation in design. To minimize wasted address space,
they have requested VLSM to be used when appropriate.
Phase 1: Addressing the WAN & LAN
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
Limerick
PPP Link
PAP
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
Use the following instructions to complete Phase 1:
 Use 172.16.0.0/22 for internal addressing with IP subnet zero enabled.
 Apply /30 subnets on all serial interfaces, using the last available subnet.
 Assign an appropriately sized subnet for the Cork LAN, which has about 900 devices:
-
VLAN 99: 31 devices (Management VLAN)
-
VLAN 2: 120 hosts
-
VLAN 3: 40 hosts
-
VLAN 4: 225 hosts
 Assign the appropriately sized subnet to the Limerick LAN, which has 100 hosts.
 Assign the appropriate sized subnet to the Belfast LAN, which has 50 hosts.
 Assign an appropriately sized subnet for the Galway LAN, which has 150 devices.
 Assign an appropriately sized subnet for the Derry LAN, which has 10 devices.
 Document all of the addressing in tables.
DHCP POOL (covered in phase 6)
Configure DHCP services on the Galway router. DHCP should provide services to the
following LANs hosts:
 Galway LAN,
 Cork’s VLAN 2, VLAN 3 and VLAN 4
Phase 2: Configuring Static and Default
Routes, RIP & OSPF Routing
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
Limerick
PPP Link
PAP
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
Use the following instructions to complete Phase 2:
 Configure each router with a hostname and required passwords.
 Configure each interface on all routers documented in Phase 1.
 Configure OSPF on the Cork, Limerick, and Belfast routers.
 Configure Default Route and redistribute such route within the AS
 Configure RIP version 2 on the Cork and Galway routers.
 Redistribute RIP networks into the OSPF routing process.
 Configure a Default Route on Galway pointing to the OSPF networks.
 Verify that the Limerick, Belfast, Galway, Derry and Cork routers have
connectivity through Layers 1-7.

Capture and save the five router configuration files. Edit the text files, and
include comments at the top of each file documenting the following:
– Your name – The date – Case Study – Phase 2
– The router name that corresponds to each file.
This documentation will serve as the deliverable item for Phase 2.
Phase 3: Configuring Frame Relay, PPP & GRE VPN
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
Limerick
PPP Link
PAP
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
Use the following instructions to complete Phase 3:
1. Configure the Frame Relay as follows:

Configure the serial interfaces on both the Cork and the Galway
routers to use Frame Relay encapsulation and LMI type ANSI.

Use Frame-Relay maps (disable Inverse-Arp)
2. Configure PPP encapsulation between:

The Belfast router and the Cork router using CHAP authentication.

The Belfast router the Limerick router using PAP authentication.

Use the password cisco
3. Configure a Site-to-Site GRE tunnel
 Configure a Site-to-Site GRE tunnel between the Belfast router and the Derry
router.
 Configure a static route on Derry and

Enable OSPF routing between the Belfast and Derry routers
Document the PP & NAT configuration in a chart; it will serve as the deliverable item for Phase 3.
Phase 4: Configuring ACLs
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
PPP Link
PAP
Limerick
G0/0
VLA
N
2
VLAN
3
VLAN
4
VLAN
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
Use the following instructions to complete Phase 4:
1. Configure an Extended ACL to filter traffic.
The ACL should:
 Deny the Galway LAN FTP and HTTP access to VLAN 2 (HR network); allow all
other traffic to all destinations within the Autonomous System.
 Setup WEB and FTP server at the HR VLAN to test your ACL
2. Configure a Standard ACL to filter traffic.
The ACL should:
 Permit the HR (VLAN 3) and the Belfast LAN users access the Limerick LAN
while denying all others.
3. Configure an Extended ACL On the Belfast Router.
The ACL should:
 Allow IP traffic for TCP and ICMP sessions originating from the inside
(established sessions) while denying IP traffic for sessions originating outside
the network.
4. Use an ACL to control VTY access to all routers.
The ACL should:

Allow telnet session to all routers from the Management VLAN (VLAN 99)
only; telnet from other networks should be denied
Document the ACL configuration a chart. This will serve as the deliverable item for Phase 4.
Phase 5: Configuring VLANs
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
PPP Link
PAP
Limerick
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
Use the following instructions to complete Phase 4:
1. Apply the basic switch configuration

Hostname and passwords
2. Configure the Cork Local Area Network switch as follows:

Create and name three Data and one Management VLAN for a total of 4 VLANs.
-
VLAN
VLAN
VLAN
VLAN
99: Management (Native)
2: HR
3: R&D
4: Production.

Assign
-

Connect Fa0/0 of the Cork router to port 1

Connect one workstation per VLAN.

Configure the workstations IP automatically.
ports:
Ports 1-2 to trunk mode (802.1Q)
Ports 3 to VLAN 99
Ports 4-7 to VLAN 2
Ports 8-11 to VLAN 3
Ports 12-15 to VLAN 4
Disable all unused ports
This documentation will serve as the deliverable item for Phase 5
Phase 6: Configuring DHCP
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
Limerick
PPP Link
PAP
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
DHCP Services
DHCP should provide services to the following LANs hosts:
 Galway LAN,
 Cork’s VLAN 2, VLAN 3 and VLAN 4
DHCP should pass the following parameters to the hosts:
 IP address, Subnet Mask and Default Gateway
The Galway router will perform DHCP. Configure the Galway using the DHCP
pools documented in Phase 1.
Configure DHCP services on the Galway router as follows:





Fa0/0 and sub-interfaces with the first useable address.
Configure the DHCP pools on the Galway router.
Exclude the first 10 IP addresses from each pool (to be used for
printers and servers)
Connect a workstation to Fa0/0 on Galway and VLANs 2-4 on the
Cork router.
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:
– Your name – The date – Case Study – Phase 5 – Galway router
This documentation will serve as the deliverable item for Phase 6
Phase 7: Configuring Dynamic & Static NAT
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
Limerick
PPP Link
PAP
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Web Server
Belfast LAN
50 hosts
Limerick LAN
100 hosts
Cork VLANs
426 hosts (total)
The Belfast router will perform NAT. Configure the Belfast router as follows:

Define the NAT pool. The pool consists of public network address
200.10.10.64/26. Exclude first 10 addresses from this pool (to be
used for public domain servers, when required).

Define an access control list, which will translate for all internal
(172.16.0.0/22) addresses only.

Establish dynamic source translation, specifying the NAT pool and the ACL
defined in the previous steps.

Specify the inside and the outside NAT interfaces.

Configure Static NAT so the Web Server can be accessed from the Internet
Phase 8: Verification and Testing
S0/0/0
Galway
S0/0/0
209.165.200.6/30
ISP
Frame
Relay
(Use a Router to
simulate the
Internet)
DCE
Derry
209.165.200.4/30
DCE
RIP V2
Galway LAN
150 hosts
209.165.200.0/30
S0/1/0
209.165.200.1/30
S0/0/0
S0/0/0
Cork
Nat Outside
200.10.10.64/26
Nat Inside
172.16.0.0/22
Belfast
S0/0/1
PPP Link
CHAP
G0/0
10 hosts
S0/0/1
G0/0
S0/0/0
PPP Link
PAP
Limerick
G0/0
VLA
N
2
VLAN
3
VLAN
4
N
VLA
99
OSPF 10
area 0
Limerick LAN
100 hosts
Web Server
Belfast LAN
50 hosts
Cork VLANs
426 hosts (total)
S0/0 the following instructions to complete
Use
InternetPhase 5:
Frame
Galway 1.
2.
Galway LAN
400 hosts
(Use a PC to
Relay
Verify communication
between various hosts
in the network. Troubleshoot
simulate
DCE
and fix any problems in the network until10.0.0.2/30)
it works Galaway
properly. Document the
results of the
tests
in
a
table.
DCE
RIP V2 and save the router configuration files for all four routers. Edit the
Recapture
Fa0/0
text files, and include comments at the top of10.0.0.1/30
each file documenting the
S0/0
following:
S0/0
– Your name
S0/1
Cork
S0/1
Belfast
– The date
PPP Link
– Fa0/0
–CHAP
Final RouterFa0/1
Configuration
– The router name that corresponds to each file.
S0/0
Nat Outside
Limerick
PPP Link
200.10.10.64/26
PAP
Fa0/0
Nat Inside
172.16.0.0/21
This documentation, along with the completed tables from Phase 1, Phase 2, Phase 3,
Phase4, Phase 5, Phase 6, and Phase 7, will serveBelfast
as theLAN
final deliverable item for the
20
hosts
case study.
VLA
N
Limerick LAN
N
VLA
VLAN
VLAN
2
99
200 hosts
3
4
Cork VLANs
900 hosts (total)
OSPF 10
area 0
Phase 9: Case Study Deliverables
Documentation & Presentation
The final task in this case study is to deliver a 20 minutes presentation of the main features
of the design decisions and recommendations. A formal written report should also be
provided that contains all of the design documents as well as all the supporting worksheets
(see the case study requirements; Overview and Objectives on page 1).
The design documentation should include: device configurations, a list of the number and
types of networking devices selected for this design, logical and physical diagrams,
subnetting scheme, and network testing verifications. The completed tables from Phase 1,
Phase 2, Phase 3, Phase 4, Phase 6, Phase 6, Phase 7, and Phase 8 should be included with
the final deliverable items.
The following items must be included in the final report and presentation:
• Outline
• Summary of the Company and Network Requirements
• Discussion on the implementation of IP address and VLSM
• Discussion on the implementation of Routing
• Discussion on the implementation of VLANs, STP, and switches
• Discussion on the physical layer design and equipment
• Discussion on testing and verification strategies
• Recommendations for future network upgrades
• Logical Diagram
• Physical Diagram
• IP Addressing Table
• Router Interface Table
• Switch Table
• Equipment Table including quantity, make and model (Routers & Switches
•
•
•
ONLY)
Show Commands outputs to verify connectivity and operation:
show ip route, show ip ospf neighbors, show spanning-tree, show vlan,
ping, telnet, etc.
Router Configurations
Switch Configuration
The documentation should be complete and should contain enough information to allow a
third party to properly install and configure or troubleshoot the network without requesting
additional information.