Subnet Design Lab

In this lab, I planned and designed a network simulated for a school in Packet Tracer. The network that I started with was 10.26.0.0/16, and I split that network into different subnets.

Subnet Table

The table below shows the different VLANs that I configured in this lab and information regarding each subnet.

VLAN	VLAN_NAME	Hosts Needed	Network	Netmask	CIDR	Router Address	Last Usable
200	StuWireless	900	10.26.0.0	255.255.252.0	/22	10.26.0.1	10.26.3.254
210	FSWireless	650	10.26.4.0	255.255.252.0	/22	10.26.4.1	10.26.7.254
110	Student	450	10.26.8.0	255.255.254.0	/23	10.26.8.1	10.26.9.254
1	Management	250	10.26.10.0	255.255.255.0	/24	10.26.10.1	10.26.10.254
100	FacStaff	200	10.26.11.0	255.255.255.0	/24	10.26.11.1	10.26.11.254
130	StuLab1	35	10.26.12.0	255.255.255.192	/26	10.26.12.1	10.26.12.62
140	StuLab2	35	10.26.12.64	255.255.255.192	/26	10.26.12.65	10.0.12.126

Physical Setup in Packet Tracer.

• I used a preset packet tracer file with devices already placed for this lab.
• The setup represents two lab environments and two different classroom environments.
• Each room contains devices on different VLANs and has its own layer 2 switch.
• There are two layer 3 routing switches: One for the East and one for the West.
• After I finished logical configuration, I connected the devices with the appropriate cable.
• The screenshot below shows the finished setup Solid Line is Straight Through and Dotted Line is Crossover

Logical Setup in Packet Tracer

• I configured the devices shown in the packet tracer screenshot above according to the the Subnet table at the top of the page.
• On each switch, I added to the VLAN database according to the following guidelines:
  • 100 and 110 to all
  • 130 (Lab1) in East-02 switch only
  • 140 (Lab2) in West-02 switch only
• On each switch, I assigned VLANs according to the following guidelines:
  • All edge switches assigned VLAN 100 (FacStaff) on ports 4-12
  • All edge switches assigned VLAN 110 (Student) on ports 13-20
  • East-Edge-02 assigned VLAN 130 (Lab1) on ports 21-24
  • West-Edge-02 assigned VLAN 140 (Lab2) on ports 21-24
• Useful commands that I used to do this are:

interface range FastEthernet 0/x-y (where x-y is the port range)
switchport access vlan x (where x is the vlan number))

• The above commands are useful for assigning VLANs to ranges of ports.
• For host machines, such as FacStaff PCs, Student Laptops, and Lab PCs, I used the first usable host addresses in their corresponding network.

Trunk Ports

• I then configured the FastEthernet 0/1 and 0/2 ports as trunk ports on the core switches in the configuration tab for each switch. I set each trunk port for the 100, 110, 130, and 140 VLANs.
• I then configured the FastEthernet 0/1 port as a trunk port on each edge switch in the configuration tab for each switch. I set each trunk port for the 100, 110, 130, and 140 VLANs

Enabling Routing

• On the East Core Switch, I configured routing according to the table, using the following commands:

(config)ip routing 
(config)interface vlan 100 
(config-if)ip address 10.26.11.1 255.255.255.0
(config)interface vlan 110 
(config-if)ip address 10.26.8.1 255.255.254.0
(config)interface vlan 130 
(config-if)ip address 10.26.12.1 255.255.255.192
(config)interface vlan 140 
(config-if)ip address 10.26.11.65 255.255.255.192

The above commands set the routing address for each vlan

Cisco Console Prefix Tips

• The prefix before typing a command specifies the mode you are in.
  • Ex: (config-if) means you are editing an interface2

Trunking Between East and West

• I configured the Gigabit Ethernet 0/1 port for each core switch as a trunk port and configured them for the 100, 110, 130, and 140 VLANs and connected the core switches with a crossover cable.
• After completing all these steps, I was able to ping across all devices across all VLANs.