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Assignment #1 Debriefing
Subnetting Tutorial & Reference Page
- If no mask/prefix is given, then borrow bits starting from the “Class” boundary of the IP address.
- If a mask/prefix is given, then the given mask/prefix is the result of subnetting. (Borrow bits from the “Class” boundary to the given mask/prefix.)
- The total number of subnets must be a power of 2.
- The total number of hosts must be a power of 2.
- Is the question asking for “subnets” or “hosts”
- If you’re asked for the # of hosts, then you must determine how many bits are needed to get that # of hosts, then subtract those bits from the 32 IPv4 bits, to determine the network bits / mask / prefix.
- Determine the number of subnets: 2 [number of bits borrowed].
- Determine the total number of addresses: 2 [the number of host bits].
- Add the Wildcard mask to the network/subnet address to determine the broadcast/last address in the network/subnet.
- Block Size:
- The block size (256 – [The interesting octet]) is best used to determine the increment of the subnets.
- The interesting octet is the last octet, from the left, that you borrowed bits from.
- The “block size” is the increment from one subnet to the next, within the “interesting” octet. It is not the number of addresses per subnet.
- Practice makes improvement!
We’ll cover Large Number of Subnets and Decimal to Base-256 dotted-decimal conversion during our next class
Do: Assignment #2: Due before Thurs. Sept. 23, 2021 6pm EST
- Download the Assignment
- Important: Make sure to read and understand the instructions on how to handle the protected PDF
- If you have any issues completing all parts of every question on the assignment, e-mail me with the question # and the specifics you need assistance with.
- No late assignments will be accepted.
- Review Examples: IPv4-CustomSubnetMasks-Examples-1-3.pdf
- Memorize these Bit Patterns of Often Used Subnet Mask Values (pdf)
Make sure to always have access to a calculator which has an Exponent function (^key) ( xy ) for every class.