8.2.1.4 Packet Tracer – Designing and Implementing a VLSM Addressing Scheme
From year to year, Cisco has updated many versions with difference questions. The latest version is version 6.0 in 2018. What is your version? It depends on your instructor creating your class. We recommend you to go thought all version if you are not clear. While you take online test with netacad.com, You may get random questions from all version. Each version have 1 to 10 different questions or more. After you review all questions, You should practice with our online test system by go to "Online Test" link below.
Packet Tracer – Designing and Implementing a VLSM Addressing Scheme (Answer Version)
Answer Note: Red font color or gray highlights indicate text that appears in the Answer copy only.
Topology
You will receive one of three possible topologies.
Addressing Table
| Device | Interface | IP Address | Subnet Mask | Default Gateway |
| [[R1Name]] | G0/0 | [[R1G0Add]] | [[R1G0Sub]] | N/A |
| G0/1 | [[R1G1Add]] | [[R1G1Sub]] | N/A | |
| S0/0/0 | [[R1S0Add]] | [[R1S0Sub]] | N/A | |
| [[R2Name]] | G0/0 | [[R2G0Add]] | [[R2G0Sub]] | N/A |
| G0/1 | [[R2G1Add]] | [[R2G1Sub]] | N/A | |
| S0/0/0 | [[R2S0Add]] | [[R2S0Sub]] | N/A | |
| [[S1Name]] | VLAN 1 | [[S1Add]] | [[S1Sub]] | [[R1G0Add]] |
| [[S2Name]] | VLAN 1 | [[S2Add]] | [[S2Sub]] | [[R1G1Add]] |
| [[S3Name]] | VLAN 1 | [[S3Add]] | [[S3Sub]] | [[R2G0Add]] |
| [[S4Name]] | VLAN 1 | [[S4Add]] | [[S4Sub]] | [[R2G1Add]] |
| [[PC1Name]] | NIC | [[PC1Add]] | [[PC1Sub]] | [[R1G0Add]] |
| [[PC2Name]] | NIC | [[PC2Add]] | [[PC2Sub]] | [[R1G1Add]] |
| [[PC3Name]] | NIC | [[PC3Add]] | [[PC3Sub]] | [[R2G0Add]] |
| [[PC4Name]] | NIC | [[PC4Add]] | [[PC4Sub]] | [[R2G1Add]] |
Objectives
Part 1: Examine the Network Requirements
Part 2: Design the VLSM Addressing Scheme
Part 3: Assign IP Addresses to Devices and Verify Connectivity
Background
In this activity, you are given a /24 network address to use to design a VLSM addressing scheme. Based on a set of requirements, you will assign subnets and addressing, configure devices and verify connectivity.
Part 1: Examine the Network Requirements
Step 1: Determine the number of subnets needed.
You will subnet the network address [[DisplayNet]]. The network has the following requirements:
- [[S1Name]] LAN will require [[HostReg1]] host IP addresses
- [[S2Name]] LAN will require [[HostReg2]] host IP addresses
- [[S3Name]] LAN will require [[HostReg3]] host IP addresses
- [[S4Name]] LAN will require [[HostReg4]] host IP addresses
How many subnets are needed in the network topology? 5
Step 2: Determine the subnet mask information for each subnet.
- Which subnet mask will accommodate the number of IP addresses required for [[S1Name]]?
- How many usable host addresses will this subnet support?
- Which subnet mask will accommodate the number of IP addresses required for [[S2Name]]?
- How many usable host addresses will this subnet support?
- Which subnet mask will accommodate the number of IP addresses required for [[S3Name]]?
- How many usable host addresses will this subnet support?
- Which subnet mask will accommodate the number of IP addresses required for [[S4Name]]?
- How many usable host addresses will this subnet support?
- Which subnet mask will accommodate the number of IP addresses required for the connection between [[R1Name]] and [[R2Name]]?
Part 2: Design the VLSM Addressing Scheme
Step 1: Divide the [[DisplayNet]] network based on the number of hosts per subnet.
- Use the first subnet to accommodate the largest LAN.
- Use the second subnet to accommodate the second largest LAN.
- Use the third subnet to accommodate the third largest LAN.
- Use the fourth subnet to accommodate the fourth largest LAN.
- Use the fifth subnet to accommodate the connection between [[R1Name]] and [[R2Name]].
Step 2: Document the VLSM subnets.
Complete the Subnet Table, listing the subnet descriptions (e.g. [[S1Name]] LAN), number of hosts needed, then network address for the subnet, the first usable host address, and the broadcast address. Repeat until all addresses are listed.
Subnet Table
Note: The correct answers for this table are variable depending on the scenario received. Refer to the Answer Notes at the end of these instructions for further information. The format here follows what the student used in Designing and Implementing a VLSM Addressing Scheme.
| Subnet Description | Number of Hosts Needed | Network Address/CIDR | First Usable Host Address | Broadcast Address |
Step 3: Document the addressing scheme.
- Assign the first usable IP addresses to [[R1Name]] for the two LAN links and the WAN link.
- Assign the first usable IP addresses to [[R2Name]] for the two LANs links. Assign the last usable IP address for the WAN link.
- Assign the second usable IP addresses to the switches.
- Assign the last usable IP addresses to the hosts.
Part 3: Assign IP Addresses to Devices and Verify Connectivity
Most of the IP addressing is already configured on this network. Implement the following steps to complete the addressing configuration.
Step 1: Configure IP addressing on [[R1Name]] LAN interfaces.
Step 2: Configure IP addressing on [[S3Name]], including the default gateway.
Step 3: Configure IP addressing on [[PC4Name]], including the default gateway.
Step 4: Verify connectivity.
You can only verify connectivity from [[R1Name]], [[S3Name]], and [[PC4Name]]. However, you should be able to ping every IP address listed in the Addressing Table.
Suggested Scoring Rubric
Note: The majority of points are allocated to designing and documenting the addressing scheme. Implementation of the addresses in Packet Tracer is of minimal consideration.
| Activity Section | Question Location | Possible Points | Earned Points |
| Part 1: Examine the Network Requirements | Step 1 | 1 | |
| Step 2 | 4 | ||
| Part 1 Total | 5 | ||
| Part 2: Design the VLSM Addressing Scheme | |||
| Complete Subnet Table | 25 | ||
| Document Addressing | 40 | ||
| Part 2 Total | 65 | ||
| Packet Tracer Score | 30 | ||
| Total Score | 100 | ||
ID:[[indexAdds]][[indexNames]][[indexTopos]]
Answer Notes:
The following addressing tables represent the three possible addressing scenarios the student may get. Note that the Device column is independent of the addressing scheme. For example, a student could receive the device names from Scenario 1 and the addressing scheme from Scenario 3. In addition, the three possible topologies are also independent of the device names and the addressing scheme (click reset in the activity to see the different topologies). Therefore, this activity uses three independent variables with three possible values each for a total of 27 possible combinations (3 device names x 3 addressing schemes x 3 topologies = 27 isomorphs).
Scenario 1 – Network Address: 10.11.48.0/24
Subnet Table
| Subnet Description | Number of Hosts Needed | Network Address/CIDR | First Usable Host Address | Last Usable Host Address | Broadcast Address |
| Host-D LAN | 60 | 10.11.48.0/26 | 10.11.48.1 | 10.11.48.62 | 10.11.48.63 |
| Host-B LAN | 30 | 10.11.48.64/27 | 10.11.48.65 | 10.11.48.94 | 10.11.48.95 |
| Host-A LAN | 14 | 10.11.48.96/28 | 10.11.48.97 | 10.11.48.110 | 10.11.48.111 |
| Host-C LAN | 6 | 10.11.48.112/29 | 10.11.48.113 | 10.11.48.118 | 10.11.48.119 |
| WAN Link | 2 | 10.11.48.120/30 | 10.11.48.121 | 10.11.48.122 | 10.11.48.123 |
| Device | Interface | Address | Subnet Mask | Default Gateway |
| Building1 | G0/0 | 10.11.48.97 | 255.255.255.240 | N/A |
| G0/1 | 10.11.48.65 | 255.255.255.224 | N/A | |
| S0/0/0 | 10.11.48.121 | 255.255.255.252 | N/A | |
| Building2 | G0/0 | 10.11.48.113 | 255.255.255.248 | N/A |
| G0/1 | 10.11.48.1 | 255.255.255.192 | N/A | |
| S0/0/0 | 10.11.48.122 | 255.255.255.252 | N/A | |
| ASW1 | VLAN 1 | 10.11.48.98 | 255.255.255.240 | 10.11.48.97 |
| ASW2 | VLAN 1 | 10.11.48.66 | 255.255.255.224 | 10.11.48.65 |
| ASW3 | VLAN 1 | 10.11.48.114 | 255.255.255.248 | 10.11.48.113 |
| ASW4 | VLAN 1 | 10.11.48.2 | 255.255.255.192 | 10.11.48.1 |
| Host-A | NIC | 10.11.48.110 | 255.255.255.240 | 10.11.48.97 |
| Host-B | NIC | 10.11.48.94 | 255.255.255.224 | 10.11.48.65 |
| Host-C | NIC | 10.11.48.118 | 255.255.255.248 | 10.11.48.113 |
| Host-D | NIC | 10.11.48.62 | 255.255.255.192 | 10.11.48.1 |
Building 1
en conf t int g0/0 ip add 10.11.48.97 255.255.255.240 no shut int g0/1 ip add 10.11.48.65 255.255.255.224 no shut
ASW3
en conf t int vlan 1 ip add 10.11.48.114 255.255.255.248 no shut ip def 10.11.48.113
Scenario 2 – Network Address: 172.31.103.0/24
Subnet Table
| Subnet Description | Number of Hosts Needed | Network Address/CIDR | First Usable Host Address | Last Usable Host Address | Broadcast Address |
| PC-A LAN | 27 | 172.31.103.0/27 | 172.31.103.1 | 172.31.103.30 | 172.31.103.31 |
| PC-B LAN | 25 | 172.31.103.32/27 | 172.31.103.33 | 172.31.103.62 | 172.31.103.63 |
| PC-C LAN | 14 | 172.31.103.64/28 | 172.31.103.65 | 172.31.103.78 | 172.31.103.79 |
| PC-D LAN | 8 | 172.31.103.80/28 | 172.31.103.81 | 172.31.103.94 | 172.31.103.95 |
| WAN Link | 2 | 172.31.103.96/30 | 172.31.103.97 | 172.31.103.98 | 172.31.103.99 |
| Device | Interface | Address | Subnet Mask | Default Gateway |
| Branch1 | G0/0 | 172.31.103.1 | 255.255.255.224 | N/A |
| G0/1 | 172.31.103.33 | 255.255.255.224 | N/A | |
| S0/0/0 | 172.31.103.97 | 255.255.255.252 | N/A | |
| Branch2 | G0/0 | 172.31.103.65 | 255.255.255.240 | N/A |
| G0/1 | 172.31.103.81 | 255.255.255.240 | N/A | |
| S0/0/0 | 172.31.103.98 | 255.255.255.252 | N/A | |
| Room-114 | VLAN 1 | 172.31.103.2 | 255.255.255.224 | 172.31.103.1 |
| Room-279 | VLAN 1 | 172.31.103.34 | 255.255.255.224 | 172.31.103.33 |
| Room-312 | VLAN 1 | 172.31.103.66 | 255.255.255.240 | 172.31.103.65 |
| Room-407 | VLAN 1 | 172.31.103.82 | 255.255.255.240 | 172.31.103.81 |
| PC-A | NIC | 172.31.103.30 | 255.255.255.224 | 172.31.103.1 |
| PC-B | NIC | 172.31.103.62 | 255.255.255.224 | 172.31.103.33 |
| PC-C | NIC | 172.31.103.78 | 255.255.255.240 | 172.31.103.65 |
| PC-D | NIC | 172.31.103.94 | 255.255.255.240 | 172.31.103.81 |
Branch 1
en conf t int g0/0 ip add 172.31.103.1 255.255.255.224 no shut int g0/1 ip add 172.31.103.33 255.255.255.224 no shut
Room-312
en conf t int vlan 1 ip add 172.31.103.66 255.255.255.240 no shut ip def 172.31.103.65
Scenario 3 – Network Address: 192.168.72.0/24
Subnet Table
| Subnet Description | Number of Hosts Needed | Network Address/CIDR | First Usable Host Address | Last Usable Host Address | Broadcast Address |
| User-4 LAN | 58 | 192.168.72.0/26 | 192.168.72.1 | 192.168.72.62 | 192.168.72.63 |
| User-3 LAN | 29 | 192.168.72.64/27 | 192.168.72.65 | 192.168.72.94 | 192.168.72.95 |
| User-2 LAN | 15 | 192.168.72.96/27 | 192.168.72.97 | 192.168.72.126 | 192.168.72.127 |
| User-1 LAN | 7 | 192.168.72.128/28 | 192.168.72.129 | 192.168.72.142 | 192.168.72.143 |
| WAN Link | 2 | 192.168.72.144/30 | 192.168.72.145 | 192.168.72.146 | 192.168.72.147 |
| Device | Interface | Address | Subnet Mask | Default Gateway |
| Remote-Site1 | G0/0 | 192.168.72.129 | 255.255.255.240 | N/A |
| G0/1 | 192.168.72.97 | 255.255.255.224 | N/A | |
| S0/0/0 | 192.168.72.145 | 255.255.255.252 | N/A | |
| Remote-Site2 | G0/0 | 192.168.72.65 | 255.255.255.224 | N/A |
| G0/1 | 192.168.72.1 | 255.255.255.192 | N/A | |
| S0/0/0 | 192.168.72.146 | 255.255.255.252 | N/A | |
| Sw1 | VLAN 1 | 192.168.72.130 | 255.255.255.240 | 192.168.72.129 |
| Sw2 | VLAN 1 | 192.168.72.98 | 255.255.255.224 | 192.168.72.97 |
| Sw3 | VLAN 1 | 192.168.72.66 | 255.255.255.224 | 192.168.72.65 |
| Sw4 | VLAN 1 | 192.168.72.2 | 255.255.255.192 | 192.168.72.1 |
| User-1 | NIC | 192.168.72.142 | 255.255.255.240 | 192.168.72.129 |
| User-2 | NIC | 192.168.72.126 | 255.255.255.224 | 192.168.72.97 |
| User-3 | NIC | 192.168.72.94 | 255.255.255.224 | 192.168.72.65 |
| User-4 | NIC | 192.168.72.62 | 255.255.255.192 | 192.168.72.1 |
Remote-Site1
en conf t int g0/0 ip add 192.168.72.129 255.255.255.240 no shut int g0/1 ip add 192.168.72.97 255.255.255.224 no shut
Sw-3
en conf t int vlan 1 ip add 192.168.72.66 255.255.255.224 no shut ip def 192.168.72.65
From year to year, Cisco has updated many versions with difference questions. The latest version is version 6.0 in 2018. What is your version? It depends on your instructor creating your class. We recommend you to go thought all version if you are not clear. While you take online test with netacad.com, You may get random questions from all version. Each version have 1 to 10 different questions or more. After you review all questions, You should practice with our online test system by go to "Online Test" link below.