Network Design and Implementation

This practical assignment focuses on network design and implementation using Cisco Packet Tracer. It's divided into two phases. Phase 1 involves designing and implementing a switched network with VLANs, spanning tree protocol, inter-VLAN routing, HSRP, and multi-area OSPF. Students must plan an addressing scheme, configure switches and routers, and perform a functional check. Phase 2 builds upon Phase 1 by adding Quality of Service (QoS) features, including traffic classification, marking, queuing, and congestion management. Students must configure QoS policies, implement congestion avoidance, and explain the differences between multicasting and unicasting. Both phases require detailed explanations of the configuration steps and justifications for the choices made. The assignment assesses students' understanding of networking concepts and their ability to apply them practically using Packet Tracer.

Network Design and Implementation Assessment 1.0 Phase
1
Detailed Learning Objectives
Upon completion of this case study, you will have demonstrated the ability to:
 Assign appropriate addresses to interfaces and host PCs in accordance with the topology
diagram.
 Cable the network according to the diagram.
 Implement trunk links between switches.
 Implement VLANs within the switch network.
 Implement spanning tree protocol.
 Implement inter-VLAN routing.
 Implement Cisco HSRP.
 Implement Multi-area OSPF.
Figure 1 – Topology Diagram
Scenario
You are required to implement a switched network supporting four data VLANs for the network users.
The network is designed with redundant links between switches, which must carry the VLANs to the
layer 3 switches. Spanning tree and HSRP are required to provide L2 and L3 resiliency respectively,
and multi-area OSPF is configured within the network core.
Note: Save Packet Tracer frequently and keep text copies of your configuration to
prevent disaster when the software crashes.

Task 1: Planning the addressing scheme.
Step 1: Subnet the Address Space
 The 172.16.0.0 / 16 address space has been assigned to support a series of subnets as
detailed in Table 1. You will also need to calculate appropriate contiguous address ranges for
all VLANs, as well as for the links between DLS1, DLS2, R1, R2 and Core.
 Explain how you calculated the required subnets, and explain any assumptions made.
VLAN ID Name Interfaces Number of Hosts
15 Staff Fa0/5-10 150
20 Students Fa0/11-15 1000
25 Registry Fa0/16-20 75
30 Voice Fa0/7-10, 16-20 225
99 Network Admin Fa0/24 (AS2 only) 10
Table 1 – Subnet Requirements
Explanation Total: ___________________15%
Step 2: Document and assign interface and PC addresses
 Assign the last usable address in each subnet to the HSRP virtual IP address. Assign VLAN
SVI addresses on DLS1 & DLS2 contiguous with the HSRP virtual IP address.
 All switch remote management will be via VLAN 99, so assign ALS1 a contiguous address
following on from that assigned to DLS1 & DLS2 SVIs for VLAN 99.
 The Staff, Student and Voice VLANs will use DHCP to assign addresses, Registry and
Network Admin will use static assignment.
 Assign appropriate IP addresses to the router interfaces from the assigned address space.
 Document the IP addressing plan, containing assigned IP addresses, masks, default
gateways, etc in a tabular form within your report.
Table Total: ___________________10%
Step 3: Build the network in Packet Tracer
 Build the network shown in the topology diagram in Packet Tracer, and assign interface
addresses as per Step 2.
 Name the file in the format surname_studentID_assessment1, e.g
smith_s1234567_assessment1
PT Addressing Total: _________________5%

Task 2: VLAN Configuration.
Step 1: Configure all Switches
Within your Packet Tracer file, configure the switched network to support the following requirements:
 Assign ALS1 switch ports to VLANs as per Table 1 and secure all unused ports.
 Allow only operational VLANs across the inter-switch links, and perform any VLAN security
configuration you consider necessary.
 Aggregate all inter-switch trunk links using EtherChannel.
 Configure STP for optimum performance, and set DLS1 as the root for VLANs 15 & 20 and
DLS2 as the root for VLANs 25, 30 & 99.
 Configure DHCP on DLS1 for VLANs 15 & 20 and on DLS2 for VLAN 30.
 Configure the switched network to allow interconnectivity between VLANs, and provide first-
hop redundancy using HSRP for VLANs 15, 20, 25, 30 & 99.
 Configure all switches to allow for secure remote configuration from PC3.
Configuration Total: _________________10%
Step 2: Switching Explanation
 Summarise the configuration steps performed in Task 2, and explain/justify why you
performed them.
Explanation Total: ___________________20%
Task 3: Multi-Area OSPF Configuration.
Step 1: Configure all L3 Devices
Within your Packet Tracer file, configure the routed network to support the following requirements:
 Configure OSPF as per the topology diagram using the most restrictive wildcard masks
possible, and prevent the inadvertent advertisement of OSPF traffic into the VLANs.
 Loopback 2 on the Core router is not to be advertised using a network statement, but must be
reachable from all user PCs.
 Configure OSPF so that R1 is the DR for all multi-access network segments.
 Secure OSPF from routing update spoofing.
Configuration Total: _________________10%
Step 2: OSPF Explanation
 Summarise the configuration steps performed in Task 3, and explain/justify why you
performed them.
 Explain the key differences between the configuration requirements of OSPFv2 and OSPFv3.
Explanation Total: ___________________20%
Task 4: Phase 1 Acceptance Test
 Prior to handing over the network to the customer at the end of phase 1, you are required to
demonstrate that it is fully operational, and the requested features have been implemented
correctly.
 Devise, justify and document a complete structured functional check of your completed
Packet Tracer network, to ensure that it meets the stipulated requirements, diagnosing,
documenting and rectifying any faults found during the process.
Phase 1 Functional Check Total: ___________________10%

Network Design and Implementation Assessment 1.0 Phase
2
Scenario
You are required to implement a Quality of Service (QoS) within the network built in Phase 1 in
accordance with the policy summary shown in Table 2.
Name Queue Link Allocation
(%)
DSCP Marking Protocols
Real Time Priority 10 EF (46) VoIP
Gold Guarenteed 10 AF41 (34) Voice signalling
Silver Guaranteed 30 AF31 (26) Web, file
transfer, email
Server Guaranteed 25 AF21 (18) All other local
server traffic
(NTP, DNS,
TFTP)
Class Default Fair Queue n/a BE (0) Default queue
for any other
traffic
Table 2 – QoS Policy Summary
Task 1: Traffic Classification, Marking and Queuing
Step 1: Configure Traffic Classification
 Classify the traffic arriving on R1 from the switched LAN, in accordance with Table 2.
Configure R2 to classify traffic based on DSCP markings set by R1.
 Configure the switched network to trust the CoS markings from the connected Cisco IP
phones, and trust DSCP markings on the connections to servers. All DSCP/CoS markings
received from PCs should be set to best-effort.
Traffic Classification Total: ___________________10%
Step 2: Configure Traffic Marking
 Mark the classified traffic on R1 using the DSCP values from Table 2.
Traffic Marking Total: ___________________10%

Step 3: Configure Congestion Management
 Implement congestion management queuing for R1 S0/0/0 and R2 S0/0/1 interfaces, based
on the traffic classified and marked in step 1 and the policy detailed in Table 2.
Congestion Management Total: ___________________10%
Step 4: Traffic Classification, Marking and Queuing Explanation
 Summarise the configuration steps performed in Task 1, and explain/justify why you
performed them.
 Explain the key differences priority and guaranteed queues.
Explanation Total: ___________________20%
Task2: Configure Congestion
Avoidance Name Maximum Queue
Depth
Minimum Queue
Depth (% of Max)
Denominator
Gold 60 50 10
Silver 60 50 10
Server 60 50 10
Table 3 – Congestion Avoidance Requirements
Step 1: Configure Congestion Avoidance
Implement congestion avoidance on the Gold, Silver and Server queues in accordance with Table 3
for R1 and R2:
Congestion Avoidance Total: ___________________10%
Step 2: Configure Congestion Avoidance Explanation
 Summarise the configuration steps performed in Task 2, and explain/justify why you
performed them.
 Explain the key differences between congestion management and congestion avoidance.
Explanation Total: ___________________20%
Task 3: Multicasting
Step 1: Multicasting vs Unicasting Explanation
 Contrast the use of multicasting as opposed to unicast techniques to support video streaming
in a network, and explain the implications for QoS.
Explanation Total: ___________________10%
Task 4: Phase 2 Acceptance Test
 Prior to handing over the network to the customer at the end of phase 2, you are required to
demonstrate that it is fully operational, and the requested features have been implemented
correctly.
 Devise, justify and document a complete structured functional check of your completed
Packet Tracer network, to ensure that it meets the stipulated QoS requirements, diagnosing,
documenting and rectifying any faults found during the process.
Phase 2 Functional Check Total: ___________________10%
Q4 Total: ___________________5%