11.9.3 Packet Tracer – VLSM Design and Implementation Practice Answers

11.9.3 Packet Tracer – VLSM Design and Implementation Practice Answers

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

Answers Note: Red font color or gray highlights indicate text that appears in the Answers 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

[[R1Name]]

G0/1

[[R1G1Add]]

[[R1G1Sub]]

N/A

[[R1Name]]

S0/0/0

[[R1S0Add]]

[[R1S0Sub]]

N/A

[[R2Name]]

G0/0

[[R2G0Add]]

[[R2G0Sub]]

N/A

[[R2Name]]

G0/1

[[R2G1Add]]

[[R2G1Sub]]

N/A

[[R2Name]]

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.

Instructions

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

Question:

How many subnets are needed in the network topology?

5

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

Questions:

  1. Which subnet mask will accommodate the number of IP addresses required for [[S1Name]]?

How many usable host addresses will this subnet support?

  1. Which subnet mask will accommodate the number of IP addresses required for [[S2Name]]?

How many usable host addresses will this subnet support?

  1. Which subnet mask will accommodate the number of IP addresses required for [[S3Name]]?

How many usable host addresses will this subnet support?

  1. Which subnet mask will accommodate the number of IP addresses required for [[S4Name]]?

How many usable host addresses will this subnet support?

  1. 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.

  1. Use the first subnet to accommodate the largest LAN.
  2. Use the second subnet to accommodate the second largest LAN.
  3. Use the third subnet to accommodate the third largest LAN.
  4. Use the fourth subnet to accommodate the fourth largest LAN.
  5. 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 vary depending on the scenario received. Refer to the Answers Notes at the end of these instructions for further information.

Subnet Description

Number of Hosts Needed

Network Address/CIDR

First Usable Host Address

Broadcast Address

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

blank

Step 3:  Document the addressing scheme.

  1. Assign the first usable IP addresses to [[R1Name]] for the two LAN links and the WAN link.
  2. Assign the first usable IP addresses to [[R2Name]] for the two LAN links. Assign the last usable IP address for the WAN link.
  3. Assign the second usable IP addresses to the switches.
  4. 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 [[R1Name]] router LAN interfaces.

Step 2:  Configure IP addressing on the [[S3Name]], switch 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.

ID:[[indexAdds]][[indexNames]][[indexTopos]]

End of document

Answers 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

Building1

G0/1

10.11.48.65

255.255.255.224

N/A

Building1

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

Building2

G0/1

10.11.48.1

255.255.255.192

N/A

Building2

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

Branch1

G0/1

172.31.103.33

255.255.255.224

N/A

Branch1

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

Branch2

G0/1

172.31.103.81

255.255.255.240

N/A

Branch2

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

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

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