Apipa Part 1 – Struggling hereCompTIA Network+ Course

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This topic contains 2 replies, has 2 voices, and was last updated by  Tobraham 2 years, 5 months ago.

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    Hi everyone

    Not sure if I am misunderstanding something here. I am currently doing the N+ and I have gotten to Module 1.3. Everything has been going really well. I am grasping most concepts however the section of APIPA is really confusing me.

    I might be over complicating it for myself, I just don’t understand why the IP ranges, IP Classes and APIPA part Module 1.3, are completely different.

    For Example:

    IP Classes Section

    Class A:

    Range: – & Subnet:

    APIPA part 1 Section

    Class A:

    Range: – & Subnet:

    Now this is what is completely confusing me:

    The classes specified in the IP Classes Section of Module 1.3, are those not private ranges?

    Why are the private addresses and their subnets vastly different from one another in IP Classes Section and APIPA Part 1 section of module 1.3?

    The different classes in IP Classes and APIPA Part 1 that apply to the same private network confuse the hell out of me. Which one do you choose?

    When does the classes in IP Classes apply and when does the classes in APIPA Part 1 apply?

    Anthony also mentioned that the subnet masks that identify or steal the chunk of addresses from the public domain that can be used as a private address? This has also completely lost me.

    Quite demotivated on the APIPA part 1 section as I am completely confused as to what is actually going on over there and I don’t understand the entire section.

    Will be going onto APIPA part 2 and hopefully it will make no sense however I feel this is very important and do not want to continue until I understand this part of the module.

    EDIT: Completed APIPA Part 2 and now I am even more confused… I literally did not understand anything that is happening there 🙁

    Thanks guys I appreciate the help.



    I just started watching the video myself. I think you are trying to separate the two instead of understanding that APIPA is merely a subset of IP addresses. So a Class A APIPA address is a small subset of the Class A IP ranges.

    Within each IP range, there is a small subset that is reserved for private networking. The organization that assigns public IP addresses agrees that it will not assign anyone an IP address that falls within the private range, so that you can use those IP addresses internally inside your networks. It’s a way of ensuring you don’t step on each other’s toes.

    If you were to look at it another way. Let’s say I have a set of numbers I call “Class A Numbers” that contained the numbers 1-50. I will promise to you that I will never use the numbers 35-40 so that you can do what you want with them. 35-40 will be private Class A numbers while 1-34 and 36 – 50 will be public Class A numbers.

    • This reply was modified 2 years, 5 months ago by  Tobraham.


    So looking at the real Class IP range:

    1) The full range of IPs in Class A is to

    2) Within that range, the IPs reserved for private use are –

    3) The rest of the IPs leftover are the public IPs: – and –

    Together, the public IPs plus the private IPs all combine to make the complete range of IPs in that class.

    Make sense?

    • This reply was modified 2 years, 5 months ago by  Tobraham.
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