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# Question on Security+ test

Member Posts: 41 ■■■□□□□□□□
Without exposing any particular questions from the test, was subnetting a big deal for you. IE if I just have a general knowledge of what it is will that be enough or do I really need to know subnetting, classes and CIDR notation pretty well to be prepared for the test?

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Member Posts: 137 ■■□□□□□□□□
I'm currently prepping for the test, from what I've gathered, subnetting/hex/binary are all good skills to have so you don't run into anything strange on the test.
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Member Posts: 49 ■■■□□□□□□□
labscloud wrote: »
I'm currently prepping for the test, from what I've gathered, subnetting/hex/binary are all good skills to have so you don't run into anything strange on the test.

Find a subnetting chart and memorize it and know what /28 /27 etc means, that will help you know how many hosts can be applied to a /28. If a question asks "if you need a max of 13 hosts on a subnet, What CIDR would allow you to have a maximum of 13 hosts without wasting any IP's?"

/23/26/27/28/

remember this... this is what I use. I also like think of the hosts as RAM/HDDs in size 2gb 4gb 8gb 16gb 32gb 64gb 128gb etc that help me remember.

Start at 30
/30 = 4 hosts
/29 = 8 hosts
/28 = 16 hosts
/27 = 32 hosts
/26 = 64 hosts
/25 = 128 hosts
/24 = 256 hosts
etc..

ie. /28 16 hosts (16-2) 14 hosts

I know its confusing I still get confused at times. I hope this helps you with your studies.

I'm also studying for the sec+ haven't really had any detailed subnetting questions that go in depth on the 2 failed 401 exams I have taken. I saw more of that on the net+ exam. I'm currently studying for my 3rd attempt at the 401. Hopefully it will be the charm!
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Member Posts: 15 ■□□□□□□□□□
Don't recall any specific subnetting questions, but your experience may vary.
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Member Posts: 41 ■■■□□□□□□□
Thank you. Even if I don't see it on the test that's very helpful. Makes my head hurt, but still very helpful.
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Member Posts: 49 ■■■□□□□□□□
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Member Posts: 41 ■■■□□□□□□□
You got this!
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Member Posts: 646 ■■■■■■□□□□
I uploaded this document that a previous student of mine created after I taught the subnetting class. It doesn't go into as much detail as when I teach it (about 8 hours of total class time), but it has the main points. I hope it's valuable.

http://www.techexams.net/attachments/forums/ccna-ccent/8256d1484173163-simple-document-help-subnetting-subnetting-teaching-tool.pdf
Master of Business Administration in Information Technology Management - Western Governors University
Master of Science in Information Security and Assurance - Western Governors University
Bachelor of Science in Network Administration - Western Governors University
Associate of Applied Science x4 - Heald College
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Member Posts: 41 ■■■□□□□□□□