11.9.3 Packet Tracer – VLSM Design and Implementation Practice (Answers)

11.9.3 Packet Tracer – VLSM Design and Implementation Practice (Answers)

Scenario 1 - Network Address: 10.11.48.0/24

Topology

Addressing Table

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

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.

Instructions

Part 1: Examine the Network Requirements

Step 1: Determine the number of subnets needed.

You will subnet the network address 10.11.48.0/24. The network has the following requirements:

  • ASW-1 LAN will require 14 host IP addresses
  • ASW-2 LAN will require 30 host IP addresses
  • ASW-3 LAN will require 6 host IP addresses
  • ASW-4 LAN will require 60 host IP addresses

How many subnets are needed in the network topology? 5

Step 2: Determine the subnet mask information for each subnet.

a. Which subnet mask will accommodate the number of IP addresses required for ASW-1?
255.255.255.240/28
How many usable host addresses will this subnet support?
14 (10.11.48.97 - 10.11.48.110)

b. Which subnet mask will accommodate the number of IP addresses required for ASW-2?
255.255.255.224 /27
How many usable host addresses will this subnet support?
30 (10.11.48.65 - 10.11.48.94)

c. Which subnet mask will accommodate the number of IP addresses required for ASW-3?
255.255.255.248 /29
How many usable host addresses will this subnet support?
6 (10.11.48.113 - 10.11.48.118)

d. Which subnet mask will accommodate the number of IP addresses required for ASW-4?
255.255.255.192 /26
How many usable host addresses will this subnet support?
62 (10.11.48.1 - 10.11.48.62)

e. Which subnet mask will accommodate the number of IP addresses required for the connection between Building1 and Building2?
255.255.255.252/30

Part 2: Design the VLSM Addressing Scheme

Step 1: Divide the 10.11.48.0/24 network based on the number of hosts per subnet.

a. Use the first subnet to accommodate the largest LAN.

b. Use the second subnet to accommodate the second largest LAN.

c. Use the third subnet to accommodate the third largest LAN.

d. Use the fourth subnet to accommodate the fourth largest LAN.

e. Use the fifth subnet to accommodate the connection between Building1 and Building2.

Step 2: Document the VLSM subnets.

Complete the Subnet Table, listing the subnet descriptions (e.g. ASW-1 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

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
Step 3: Document the addressing scheme.

a. Assign the first usable IP addresses to Building1 for the two LAN links and the WAN link.

b. Assign the first usable IP addresses to Building2 for the two LAN links. Assign the last usable IP address for the WAN link.

c. Assign the second usable IP addresses to the switches.

d. 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 the Building1 router LAN interfaces.
Step 2: Configure IP addressing on the ASW-3, switch including the default gateway.
Step 3: Configure IP addressing on Host-D, including the default gateway.
Step 4: Verify connectivity.

You can only verify connectivity from Building1, ASW-3, and Host-D. However, you should be able to ping every IP address listed in the Addressing Table.

Devices configuration - Answer

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
Host-D

IP Address: 10.11.48.62
Subnet Mask: 255.255.255.192
Default Gateway: 10.11.48.1

Download PDF & PKA files

Scenario 2 - Network Address: 172.31.103.0/24

Topology

11.9.3 Packet Tracer - VLSM Design and Implementation Practice - TYPE 2

11.9.3 Packet Tracer - VLSM Design and Implementation Practice - TYPE 2

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
PC-D

IP Address: 172.31.103.94
Subnet Mask: 255.255.255.240
Default Gateway: 172.31.103.81

Download Packet Tracer file

Scenario 3 - Network Address: 192.168.72.0/24

Topology

11.9.3 Packet Tracer - VLSM Design and Implementation Practice TYPE 3

11.9.3 Packet Tracer - VLSM Design and Implementation Practice TYPE 3

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
Remote-Site1 G0/1 192.168.72.97 255.255.255.224 N/A
Remote-Site1 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
Remote-Site2 G0/1 192.168.72.1 255.255.255.192 N/A
Remote-Site2 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
User-4

IP Address: 192.168.72.62
Subnet Mask: 255.255.255.192
Default Gateway: 192.168.72.1

Download Packet Tracer file


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