Download LESSON PLAN #67 Per. Name - Brooklyn Technical High School

1
L E S S O N P L A N #67
CLASS: Networking
TOPIC: TCP/IP
Per.
Name:
DATE: Friday May 8th, 2009
AIM: How does subnetting in classfull IP addressing work?
NOTE:
1) At the end of the period, leave your computer on the desktop screen, put the keyboard on top of the monitor and push in your chair.
H.W. # 67:
1) Define the function of an IP address’s subnet mask.
2) Based on the default subnet masks, identify the network ID for the following IP addresses:
A) 131.194.192.3
B) 45.200.49.201
3) Explain what is meant by using a slash notation
4) What is the motivation behind using a custom subnet mask versus a default subnet mask?
5) Your client acquires a class B static IP address of 165.1.0.0. How many hosts can your TCP/IP network support using the default
subnet mask?
6) What is meant by using a slash notation (for example /24) following an IP address? For example what does 201.23.45.123/24
represent?
7) Your client company wants to subdivide the network into 4 subnets to accommodate the different departments that will share the
network. Now you need to configure the subnet mask to accommodate the request. How many bits of the host portion of the subnet mask
do you need to borrow?
DO NOW:
1) Identify whether the following IP host addresses are valid or invalid. Give the reasons that the invalid IP host addresses.
1) 131.107.2.224
2) 255.268.3.98
3) 169.253.78.23
4) 1.3.6.10
5) 254.224.204
6) 127.0.0.1
7) 255.255.255.255
8) 0.0.0.0
9) 189.34.127.255
10) 168.254.6.8.10
PROCEDURE:
Write the AIM and DO NOW.
Get students working!
Take attendance.
Go Over HW
Collect HW
Go over the Do Now
Assignment #1:
Assuming the following IP is not part of any subnet and is using classfull addressing, what is the network ID for the IP address 172.5.5.1?
2
When given a network ID, it is possible that you will have many hosts on that network. You may want to break up that one
network into smaller networks. This can be done with subnet masks. A subnet mask is a 32 bit number, that when combined with an IP
address, identifies the subnetwork that you are on.
It is possible that you were given a network ID, but did not create any subnetworks. In that case you still have to enter a subnet
mask, but you enter the default subnet mask.
For each class of IP addresses, there is a different subnet mask.
Assignment #2:
Go to www.techweb.com/encyclopedia and look up IP address. Scroll down. What is the default subnet mask for:
Class A network ID 255.0.0.0
Class B network ID 255.255.0.0 Class C network
255.255.255.0
Assignment #3:
Go through subnetting examples with Mr. Rodriguez
Assignment #4:
2) Based on the default subnet masks, identify the network ID for the following IP addresses:
A) 193.39.110.83
B) 208.154.191.9
C) 126.9.54.172
Assignment #5:
Fill in the following table
Subnet mask host
portion with # of
bits borrowed
0
1
2
3
4
5
6
7
8
# Subnets
# Class A hosts
# Class B hosts
# Class C hosts
Assignment #6:
Compare the Host IP address, with the indicated subnet mask, with the destination IP address. Determine if the destination IP is on the
same subnet (local) or not in the same subnet (remote).
Host IP Address
210.145.149.123
192.168.4.189
10.154.187.89
132.100.45.5
151.251.100.101
Host Subnet Mask
255.255.255.0
255.255.255.224
255.192.0.0
255.255.252.0
255.255.0.0
Destination IP address
210.145.253.199
192.168.1.107
10.152.179.88
132.100.45.45
166.200.110.10
Local or Remote?
Assignment #7:
Confirm your answers using the subnet calculator program
Assignment #8:
Some organizations aren’t connected to the Internet or they want to hide their internal IP addresses from the rest of the Internet. Certain
groups of IP addresses, known as private IP addresses, are available to help in these situations. All routers destroy private IP addresses so
they can’t be used on the Internet. Go to http://www.duxcw.com/faq/network/privip.htm and list these private IP addresses.
10.0.0.0-10.255.255.255
172.16.0.0.-172.31.255.255
192.168.0.0 -192.168.255.255
3
Assignment #9:
Sometimes the IP address and subnet mask are written together as one statement as opposed to two separate addresses. This is done using
the slash notation. For example 201.23.45.123 /24 is an IP address with 201.23.45.123 with a subnet mask of 255.255.255.0. Where does
the 24 come from?
What is the slash notation for an IP address of 10.8.39.1 with a subnet mask of 255.255.248.0?
Assignment #10:
The entire 127.0.0.0 /8 is reserved for loopback testing, that is testing a NICs capability to send and receive packets. Open a command
line window and type ping 127.0.0.1. What are the results?