EDT 540 Unit 2 using Blooms Taxonomy


 


 Instructional Problem:
Students are having problems discerning the difference between an internal routing protocol using a subnet mask to apply bounds around a computer network.  Understanding a mask size can determine the size of the network and allows either more or less computers to communicate within that network.  It really comes down to a binary to decimal conversion to create a size and should really be memorized, in order to be an effective method of designing computer networks.  A network with a mask of /29 is twice the size of /30.  A mask of /28 is twice the size of a /29.

Application of featured Learning Theories / Strategies:

Converting a /32 into a ipv4 mask is as simple as 4 octets of 255.  or 2^8 4 times.
Using Information Processing Sensory registers to acknowledge the size of the network.    Network sizes must be placed into Long term memory a Declarative type of knowledge.  Just as a person knows even numbers, one must be able to declare a /30 is a network of 4 address, a /29 is a network of 8 a /28 is a network of 16.  Basically a reverse binary doubling.  Factoring out the Network number and the broadcast address (Basically minus 2) and gives a computer size of /30 is 2 usable addresses, a /29 is 6 usable addresses, a /28 is 14 usable addresses.  So when a learner sees a /32 they recognize that as the end of a network mask.  Basically a single IPv4 address. and that doubles in size and the number is reduced.

Applying Bloom's Taxonomy to calculating a subnet size.
Remembering Base 10 and Base 2, apply that to the subnet.

To find the addresses in a subnet take the mask and convert it to binary

Convert the decimal representation of the subnet mask to a binary representation.
Count each “0”s in the subnet mask. The total is the subnet mask number.

For example, the IPv4 address 8.8.8.8 /8 with a subnet mask of 255.0.0.0

analyze that example, the binary representation of 255.0.0.0 is 1111111.00000000.00000000.00000000.

Count the number of 0s digits in each place of the subnet mask.

Evaluate the results of this example, there are 24.  2^24= 16,777,216 addresses
so there are 16,777,216 addresses in a /8

Using this knowledge to build a table for other network sizes based upon needs for the number of computers on the single network.

Evaluation of the application.  Can the learner adjust network size to the required number of addresses for a given population.  If a designer needs a network that allows for 1000 computers can they subnet the network to allow for 1000 addresses.  Does the learner understand the difference between a network the size of a /22 and a size /24


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