University of Phoenix/Axia
IT240 – Appendix H “IP Subnetting Worksheet” & “Network Identification”
Part 1- “IP Subnetting”
Subnet the following networks based on the requirements given for each problem. Please note the difference between “usable” and “actual”. For each solution you will list the subnet mask for the solution. For each subnet you will list the “network” address for the subnet, the first “usable” address of the subnet range (the Start Address), the last “usable” address of the subnet (the End Address), and the Broadcast Address of the subnet.
1Subnet the following address to support 50 “usable” host addresses. List the first (5) “usable” networks.
141.0.0.0List your new subnet mask here:
Net/Wire Add / Start Add / End Add / Broadcast1
2
3
4
5
**Note: The term “HOST” implies “USABLE” because you cannot assign a host an “UN-USABLE” IP Address.
**Note:Picking “Usable Network” – If you are given a CLASSFUL address for the network, the first network is “Subnet Zero” and is not technically usable. If they ask for “Networks” then they mean “Actual” networks for which you would include Subnet Zero as the First Actual Network
EXAMPLE: If you are given 3.0.0.0 as a Classful Class A network when subnetted the “3.0.0.0” network cannot be used because it is Subnet Zero.
3.0.0.0 255.255.255.0 (Subnet Zero)
3.0.1.0 255.255.255.0 (First Usable Subnet with given Subnet Mask)
2Subnet the following address to support 50 networks. List the first (5) “usable” networks.
141.0.0.0List your new subnet mask here:
Net/Wire Add / Start Add / End Add / Broadcast1
2
3
4
5
3Subnet the following address to support 16 “usable” host addresses. List the first (5) “usable” networks.
133.1.0.0 255.255.0.0List your new subnet mask here:
Net/Wire Add / Start Add / End Add / Broadcast1
2
3
4
5
4Subnet the following address to support 16 “usable” host addresses. List the first (5) “usable” networks.
133.1.1.0 255.255.255.0List your new subnet mask here:
Note:You are now subnetting a Subnet that has already been subnetted from a Classful address. This address is now “Classless”, meaning there is no “Subnet Zero” and all Networks are Usable.
Net/Wire Add / Start Add / End Add / Broadcast1
2
3
4
5
5Is the following request for addresses from a customer “doable”?
Subnet the following address to support 300 host addresses.
200.0.1.0 255.255.255.0
YES or NO:
WHY?
Part 2- “Network Identification”
Take a look at the diagram provided below. Each of the areas of the network you need to identify is labeled with a number. Use those numbers to fill in the answer sheet below. Each term and number is only used “once”. The boxes around devices indicate those items are grouped together.
LAN WAN
PAN “Star” Topology
Default Gateway Default Gateway Address
IP Address Subnet Mask
Firewall DMZ
Tier 1 (Border) Router Tier 2 Router
Server Farm “Layer 1”
“NIC” Access “Layer 2” Switch
Core Switch Wireless Access Router
VPN Local ISP