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

Scenario 1 - Network Address: 10.11.48.0/24

Topology

Addressing Table

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

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.

Device Configs - Final

Building 1

! ==============================================================
!--- 11.9.3 Packet Tracer - VLSM Design and Implementation Practice
!--- ANSWER SCRIPT FOR ROUTER Building1 (R1)  |  SCENARIO 1 (network 10.11.48.0/24)
!--- RANDOMIZED activity (27 isomorphs). This script matches the SCENARIO 1 addressing scheme. Check YOUR network address against the Addressing Table; if it differs, use the matching scenario file. Device names may also differ (names are assigned independently).
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Part 3: Configure the R1 router LAN interfaces (serial + routing already configured).
! --------------------------------------------------------------

!--- G0/0 - first usable host of its LAN subnet.
interface g0/0
 ip address 10.11.48.97 255.255.255.240
 no shutdown
 exit

!--- G0/1 - first usable host of its LAN subnet.
interface g0/1
 ip address 10.11.48.65 255.255.255.224
 no shutdown
 exit

end

! --------------------------------------------------------------
!--- Save the running config to startup.
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show ip interface brief  -> G0/0 and G0/1 up/up
!---   show ip route            -> connected LANs + dynamic routes
! ==============================================================

ASW3

! ==============================================================
!--- 11.9.3 Packet Tracer - VLSM Design and Implementation Practice
!--- ANSWER SCRIPT FOR SWITCH ASW3 (S3)  |  SCENARIO 1 (network 10.11.48.0/24)
!--- RANDOMIZED activity (27 isomorphs). This script matches the SCENARIO 1 addressing scheme. Check YOUR network address against the Addressing Table; if it differs, use the matching scenario file. Device names may also differ (names are assigned independently).
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Part 3: Configure IP addressing on the S3 switch.
! --------------------------------------------------------------

!--- Configure the VLAN 1 management IP (second usable host of its LAN) and activate it.
interface vlan 1
 ip address 10.11.48.114 255.255.255.248
 no shutdown
 exit

!--- Set the default gateway (the R2 LAN interface on this subnet).
ip default-gateway 10.11.48.113

end

! --------------------------------------------------------------
!--- Save the running config to startup.
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show ip interface brief  -> VLAN 1 up/up with its IP
!---   ping 10.11.48.113  -> reach the default gateway
! ==============================================================

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

Addressing Table

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 172.31.103.0/24. The network has the following requirements:

• Room-114 LAN will require 27 host IP addresses
• Room-279 LAN will require 25 host IP addresses
• Room-312 LAN will require 14 host IP addresses
• Room-407 LAN will require 8 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 Room-114?
255.255.255.224 /27
How many usable host addresses will this subnet support?
30 (172.31.103.1 - 172.31.103.30)

b. Which subnet mask will accommodate the number of IP addresses required for Room-279?
255.255.255.224 /27
How many usable host addresses will this subnet support?
30 (172.31.103.33 - 172.31.103.62)

c. Which subnet mask will accommodate the number of IP addresses required for Room-312?
255.255.255.240 /28
How many usable host addresses will this subnet support?
14 (172.31.103.65 - 172.31.103.78)

d. Which subnet mask will accommodate the number of IP addresses required for Room-407?
255.255.255.240 /28
How many usable host addresses will this subnet support?
14 (172.31.103.81 - 172.31.103.94)

e. Which subnet mask will accommodate the number of IP addresses required for the connection between Branch1 and Branch2?
255.255.255.252 /30

Part 2: Design the VLSM Addressing Scheme

Step 1: Divide the 172.31.103.0/24 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 Branch1 and Branch2.

Step 2: Document the VLSM subnets.

Complete the Subnet Table, listing the subnet descriptions (e.g. Room-114 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

Step 3: Document the addressing scheme.

a. Assign the first usable IP addresses to Branch1 for the two LAN links and the WAN link.

b. Assign the first usable IP addresses to Branch2 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 Branch1 router LAN interfaces.

Step 2: Configure IP addressing on the Room-312 switch, including the default gateway.

Step 3: Configure IP addressing on PC-D, including the default gateway.

Step 4: Verify connectivity.

You can only verify connectivity from Branch1, Room-312, and PC-D. However, you should be able to ping every IP address listed in the Addressing Table.

Device Configs - Final

Branch 1

! ==============================================================
!--- 11.9.3 Packet Tracer - VLSM Design and Implementation Practice
!--- ANSWER SCRIPT FOR ROUTER Branch1 (R1)  |  SCENARIO 2 (network 172.31.103.0/24)
!--- RANDOMIZED activity (27 isomorphs). This script matches the SCENARIO 2 addressing scheme. Check YOUR network address against the Addressing Table; if it differs, use the matching scenario file. Device names may also differ (names are assigned independently).
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Part 3: Configure the R1 router LAN interfaces (serial + routing already configured).
! --------------------------------------------------------------

!--- G0/0 - first usable host of its LAN subnet.
interface g0/0
 ip address 172.31.103.1 255.255.255.224
 no shutdown
 exit

!--- G0/1 - first usable host of its LAN subnet.
interface g0/1
 ip address 172.31.103.33 255.255.255.224
 no shutdown
 exit

end

! --------------------------------------------------------------
!--- Save the running config to startup.
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show ip interface brief  -> G0/0 and G0/1 up/up
!---   show ip route            -> connected LANs + dynamic routes
! ==============================================================

Room-312

! ==============================================================
!--- 11.9.3 Packet Tracer - VLSM Design and Implementation Practice
!--- ANSWER SCRIPT FOR SWITCH Room-312 (S3)  |  SCENARIO 2 (network 172.31.103.0/24)
!--- RANDOMIZED activity (27 isomorphs). This script matches the SCENARIO 2 addressing scheme. Check YOUR network address against the Addressing Table; if it differs, use the matching scenario file. Device names may also differ (names are assigned independently).
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Part 3: Configure IP addressing on the S3 switch.
! --------------------------------------------------------------

!--- Configure the VLAN 1 management IP (second usable host of its LAN) and activate it.
interface vlan 1
 ip address 172.31.103.66 255.255.255.240
 no shutdown
 exit

!--- Set the default gateway (the R2 LAN interface on this subnet).
ip default-gateway 172.31.103.65

end

! --------------------------------------------------------------
!--- Save the running config to startup.
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show ip interface brief  -> VLAN 1 up/up with its IP
!---   ping 172.31.103.65  -> reach the default gateway
! ==============================================================

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

Addressing Table

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 192.168.72.0/24. The network has the following requirements:

• Sw1 LAN will require 7 host IP addresses
• Sw2 LAN will require 15 host IP addresses
• Sw3 LAN will require 29 host IP addresses
• Sw4 LAN will require 58 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 Sw4?
255.255.255.192 /26
How many usable host addresses will this subnet support?
62 (192.168.72.1 - 192.168.72.62)

b. Which subnet mask will accommodate the number of IP addresses required for Sw3?
255.255.255.224 /27
How many usable host addresses will this subnet support?
30 (192.168.72.65 - 192.168.72.94)

c. Which subnet mask will accommodate the number of IP addresses required for Sw2?
255.255.255.224 /27
How many usable host addresses will this subnet support?
30 (192.168.72.97 - 192.168.72.126)

d. Which subnet mask will accommodate the number of IP addresses required for Sw1?
255.255.255.240 /28
How many usable host addresses will this subnet support?
14 (192.168.72.129 - 192.168.72.142)

e. Which subnet mask will accommodate the number of IP addresses required for the connection between Remote-Site1 and Remote-Site2?
255.255.255.252 /30

Part 2: Design the VLSM Addressing Scheme

Step 1: Divide the 192.168.72.0/24 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 Remote-Site1 and Remote-Site2.

Step 2: Document the VLSM subnets.

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

Step 3: Document the addressing scheme.

a. Assign the first usable IP addresses to Remote-Site1 for the two LAN links and the WAN link.

b. Assign the first usable IP addresses to Remote-Site2 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 Remote-Site1 router LAN interfaces.

Step 2: Configure IP addressing on the Sw3 switch, including the default gateway.

Step 3: Configure IP addressing on User-4, including the default gateway.

Step 4: Verify connectivity.

You can only verify connectivity from Remote-Site1, Sw3, and User-4. However, you should be able to ping every IP address listed in the Addressing Table.

Device Configs - Final

Remote-Site1

! ==============================================================
!--- 11.9.3 Packet Tracer - VLSM Design and Implementation Practice
!--- ANSWER SCRIPT FOR ROUTER Remote-Site1 (R1)  |  SCENARIO 3 (network 192.168.72.0/24)
!--- RANDOMIZED activity (27 isomorphs). This script matches the SCENARIO 3 addressing scheme. Check YOUR network address against the Addressing Table; if it differs, use the matching scenario file. Device names may also differ (names are assigned independently).
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Part 3: Configure the R1 router LAN interfaces (serial + routing already configured).
! --------------------------------------------------------------

!--- G0/0 - first usable host of its LAN subnet.
interface g0/0
 ip address 192.168.72.129 255.255.255.240
 no shutdown
 exit

!--- G0/1 - first usable host of its LAN subnet.
interface g0/1
 ip address 192.168.72.97 255.255.255.224
 no shutdown
 exit

end

! --------------------------------------------------------------
!--- Save the running config to startup.
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show ip interface brief  -> G0/0 and G0/1 up/up
!---   show ip route            -> connected LANs + dynamic routes
! ==============================================================

Sw-3

! ==============================================================
!--- 11.9.3 Packet Tracer - VLSM Design and Implementation Practice
!--- ANSWER SCRIPT FOR SWITCH Sw-3 (S3)  |  SCENARIO 3 (network 192.168.72.0/24)
!--- RANDOMIZED activity (27 isomorphs). This script matches the SCENARIO 3 addressing scheme. Check YOUR network address against the Addressing Table; if it differs, use the matching scenario file. Device names may also differ (names are assigned independently).
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Part 3: Configure IP addressing on the S3 switch.
! --------------------------------------------------------------

!--- Configure the VLAN 1 management IP (second usable host of its LAN) and activate it.
interface vlan 1
 ip address 192.168.72.66 255.255.255.224
 no shutdown
 exit

!--- Set the default gateway (the R2 LAN interface on this subnet).
ip default-gateway 192.168.72.65

end

! --------------------------------------------------------------
!--- Save the running config to startup.
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show ip interface brief  -> VLAN 1 up/up with its IP
!---   ping 192.168.72.65  -> reach the default gateway
! ==============================================================

User-4

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

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