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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

DeviceInterfaceAddressSubnet MaskDefault Gateway
Building1G0/010.11.48.97255.255.255.240N/A
G0/110.11.48.65255.255.255.224N/A
S0/0/010.11.48.121255.255.255.252N/A
Building2G0/010.11.48.113255.255.255.248N/A
G0/110.11.48.1255.255.255.192N/A
S0/0/010.11.48.122255.255.255.252N/A
ASW1VLAN 110.11.48.98255.255.255.24010.11.48.97
ASW2VLAN 110.11.48.66255.255.255.22410.11.48.65
ASW3VLAN 110.11.48.114255.255.255.24810.11.48.113
ASW4VLAN 110.11.48.2255.255.255.19210.11.48.1
Host-ANIC10.11.48.110255.255.255.24010.11.48.97
Host-BNIC10.11.48.94255.255.255.22410.11.48.65
Host-CNIC10.11.48.118255.255.255.24810.11.48.113
Host-DNIC10.11.48.62255.255.255.19210.11.48.1

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 DescriptionNumber of Hosts NeededNetwork Address/CIDRFirst Usable Host AddressLast Usable Host AddressBroadcast Address
Host-D LAN6010.11.48.0/2610.11.48.110.11.48.6210.11.48.63
Host-B LAN3010.11.48.64/2710.11.48.6510.11.48.9410.11.48.95
Host-A LAN1410.11.48.96/2810.11.48.9710.11.48.11010.11.48.111
Host-C LAN610.11.48.112/2910.11.48.11310.11.48.11810.11.48.119
WAN Link210.11.48.120/3010.11.48.12110.11.48.12210.11.48.123
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

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Scenario 2 - Network Address: 172.31.103.0/24

Topology




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

Subnet Table

Subnet DescriptionNumber of Hosts NeededNetwork Address/CIDRFirst Usable Host AddressLast Usable Host AddressBroadcast Address
PC-A LAN27172.31.103.0/27172.31.103.1172.31.103.30172.31.103.31
PC-B LAN25172.31.103.32/27172.31.103.33172.31.103.62172.31.103.63
PC-C LAN14172.31.103.64/28172.31.103.65172.31.103.78172.31.103.79
PC-D LAN8172.31.103.80/28172.31.103.81172.31.103.94172.31.103.95
WAN Link2172.31.103.96/30172.31.103.97172.31.103.98172.31.103.99
DeviceInterfaceAddressSubnet MaskDefault Gateway
Branch1G0/0172.31.103.1255.255.255.224N/A
G0/1172.31.103.33255.255.255.224N/A
S0/0/0172.31.103.97255.255.255.252N/A
Branch2G0/0172.31.103.65255.255.255.240N/A
G0/1172.31.103.81255.255.255.240N/A
S0/0/0172.31.103.98255.255.255.252N/A
Room-114VLAN 1172.31.103.2255.255.255.224172.31.103.1
Room-279VLAN 1172.31.103.34255.255.255.224172.31.103.33
Room-312VLAN 1172.31.103.66255.255.255.240172.31.103.65
Room-407VLAN 1172.31.103.82255.255.255.240172.31.103.81
PC-ANIC172.31.103.30255.255.255.224172.31.103.1
PC-BNIC172.31.103.62255.255.255.224172.31.103.33
PC-CNIC172.31.103.78255.255.255.240172.31.103.65
PC-DNIC172.31.103.94255.255.255.240172.31.103.81
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

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Scenario 3 - Network Address: 192.168.72.0/24

Topology



11.9.3 Packet Tracer - VLSM Design and Implementation Practice TYPE 3

Subnet Table

Subnet DescriptionNumber of Hosts NeededNetwork Address/CIDRFirst Usable Host AddressLast Usable Host AddressBroadcast Address
User-4 LAN58192.168.72.0/26192.168.72.1192.168.72.62192.168.72.63
User-3 LAN29192.168.72.64/27192.168.72.65192.168.72.94192.168.72.95
User-2 LAN15192.168.72.96/27192.168.72.97192.168.72.126192.168.72.127
User-1 LAN7192.168.72.128/28192.168.72.129192.168.72.142192.168.72.143
WAN Link2192.168.72.144/30192.168.72.145192.168.72.146192.168.72.147
DeviceInterfaceAddressSubnet MaskDefault Gateway
Remote-Site1G0/0192.168.72.129255.255.255.240N/A
Remote-Site1G0/1192.168.72.97255.255.255.224N/A
Remote-Site1S0/0/0192.168.72.145255.255.255.252N/A
Remote-Site2G0/0192.168.72.65255.255.255.224N/A
Remote-Site2G0/1192.168.72.1255.255.255.192N/A
Remote-Site2S0/0/0192.168.72.146255.255.255.252N/A
Sw1VLAN 1192.168.72.130255.255.255.240192.168.72.129
Sw2VLAN 1192.168.72.98255.255.255.224192.168.72.97
Sw3VLAN 1192.168.72.66255.255.255.224192.168.72.65
Sw4VLAN 1192.168.72.2255.255.255.192192.168.72.1
User-1NIC192.168.72.142255.255.255.240192.168.72.129
User-2NIC192.168.72.126255.255.255.224192.168.72.97
User-3NIC192.168.72.94255.255.255.224192.168.72.65
User-4NIC192.168.72.62255.255.255.192192.168.72.1

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

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