I am taking a Cisco Class at my local Community college, and this video helped me have my "Ah HA!" Moment. Everybody teaches different, but this video series, is what helped me. Thank you, I will be sharing it with my fellow classmates.
It's like you get it in the first vid!! It's just naturally clicks! Then the other vidz are like supplements that show different ways to "get it". Good stuff dude. Innovative teaching. I took this class 10 yrs ago and dropped it cuz of mundane teaching methods. Thanx for your methods.
Volf Khat but when I say subnetting was a huge chunk of the exam its not just simply asking to find host numbers or broadcast addresses it's all interconnected with topics like acls natting and some routing. And yes I have done 2 part exam. The book that I would recommend is ccna by todd lammle.
Wow, man I am taking the Cisco courses now. I already took the first one, and now am taking the second class, routing protocols and concepts. The subnetting was always somewhat difficult to understand but that magic number is THE SHIT!! That was VERY easy to understand the way you explained it, great job man. Im going to check out some of your other vids.
Just to clarify for the people who did not get why he used /25 instead of /24, /24 consists of only 1 network with 254 usable hosts, this configuration required 2 networks, with at least 123 usable hosts, due to the Teachers Network requirement. Using /24 would allow the users but not the separate networks therefore we would use /25.
Thanks. So 128 would be the Network ID with 2 separate networks. Confused me because 44 users plus 123 users = 167 users/hosts. 128 host isn't enough computers for the users but since 128 per network. 0-128, network ID 0 and 127 broadcast, 128 network and 255 broadcast ID. Meaning 129-254 for second network for teach network IP addresses for the last octet!
@danscourses u explain this better than my Cisco instructor! i was confused for a month on subnetting and i watch ur video and i did a *face* *palm* *head* *desk* reaction because it is simple!! lol thanks for the video :)
Thanks very much for making this video, I'm just starting to do CCNA and I'm kind of struggling with it but these videos are giving me more and more insight, love the magic number bit, got that down to a regular, overall I think I just need to keep reviewing and keep going over the material. Big help thanks again bud!
@benghaith 127.0.0.1 is your loopback address it is your own NIC. You can ping 127.0.0.1 to see if IPv4 is installed and bound to your NIC. It is Localhost
I was just trying to show that when you subnet a network address you dikvide it into smaller networks. If your goal is two subnetworks, and the most users you will need is 123 then you can divide it into 2 subnetworks of 128 hosts each. It is a hypothetical situation but useful in passing the Cisco CCNA exam
Yes the magic number still tells you where the networks are (how the networks increment) even if the subnet mask is less than /24. if the subnet mask is greater than /24 the magic number also equals the number of hosts in the network
It is all based on the binary. the only way to understand IPv4 subnets is to know how binary works. Go to my CCNA1 playlist on my youtube channel and I cover the whole process.
I like how you present the material other than I would like it if you planned your examples ahead of time. That way it would be easier for me to follow with less restructuring of your examples. It did get a little crazy in several spots. Overall I really liked it. Thanks for taking the your time to create these.
This is really great work.. Could you show one where you are just given a class B address with no netmask and were asked to create 4 subnets(or more) with different numbers of hosts on each subnet?
At the end of the video you choose /25 because it allows for 126 hosts. Do you choose this because it allows for the 123 teachers and the 44 admin. I was thinking that I would add the students and the admin for a total of 167 host, which would lead me to choose /24. Are you asking what do you need to choose for 123 teachers as well as what do you need to choose for 44 admin?
hey bro, actually its not 32 hosts... its only 30 hosts because one of them is network number and the other one is broadcast number. so u will be having only 30 hosts for every network increment.
I agree. I learned this awhile ago and time to brush up! But when doing notes it was messing with me because I recall the broadcast and network address are not useable IP's for hosts. Very important which is what i feel like is the only thing left out
At 7:40 into the video he makes the distinction between "hosts" and "usable hosts". I agree with you in how he mislabels the number of hosts, but wanted to let you know that he does clarify this issue later on.
Yeah and technically if you are subnetting, when you are anding, that the first network since its /27. if it was /24 then yes he would have that many networks
I could never understand subnetting until I saw these videos. Thank you so much!!! Do you have any courses for CCNET 100-105 and 200-205? If you do I will sign up. I really enjoy your teaching ways.
That's great to hear Carlos. I will be teaching a full CCNA series of courses this Fall (registration begins Sept 5th) "online" through Central Oregon Community College (www.cocc.edu)
Cool. Now I have done online classes and they are good but usually the instructor just goes over the book material and leaves us alone to do labs. I can do that by myself. How do you teach? Is it like the videos that you do hands on labs etc?
thank you so much for this video. it's been bothering me what the /8 /24 slash whatever. This video solved my question. You've got a new subscriber! =) By far you're videos are easiest to understand.
In this example at the end....shouldn't be the total of both network...? 44 users+123 users to calculate the total host for both networks....? total users 167?
If there is an error in the video I tried to point it out on annotations but UA-cam got rid of the Annotations that floated on top of the videos. Probably because Flash was used earlier
It means the binary place value of the last 1 in the subnet mask (read from left to right). It tells you what the networks area, starting at 0 ( in the octet of the last 1) and going up by the magic number.
If the MN happens to be in the 4th octet, it will tell you the number of hosts in the subnet. Subtract 2 to get the usable hosts. The number zeros in the subnet mask is a better way to tell how many hosts are in the subnet. 4 zeros or 2 to the 4th power equals 16 hosts, minus 2 is 14 usable hosts
danscourses so in this tutorial, your MN is 32. means there are 5zeros left. so, its 2 to the fifth = 32 - 2 = 30 usable hosts? am i getting it right? im really dumb. its been 2days that I keep watching your vids to get it. i appreciate the reply. thanks!
Good job though you could have done better, instead of using admin which is a broad approach in determining who is who- you should have used teachers vs students - it makes much more practical in real life situations or scenarios. The overall lesson is awesome period of instruction. I am working on my CCIE. Thanks for the refresher.
I think that you are calculating the host section incorrectly. For example, a /27 would be 30 usable host addresses 2x2x2x2x2=32-2 and this is how I know it to be in any language or place.
Excuse me, but, I think that u r making a mistake here... and in the other videos before this one, when it comes to host's number ? [Host number = ((2)^(host bits)-2)] ? So in this case, there are 233 hosts for the /24, 126 host's for the /25, 62 hosts for the /26...etc.... Anyway, grate tutorials !
+SoCalGuy93065 Really? After all the effort, time and attention Dan has put forth in creating ALL these videos for those of us who DON"T know everything, THAT"S what you have to bitch about? The font? What a schmuck.
john doe just saw your comment but I think you are counting 1s that’s stand for network you should count on 0s of we are talking about hosts cause 1 represent network and 0 represent hosts so in this case it should be 2^5-2 😊
set your font to smaller size first it is very annoying to watch you changing the font and moving things around it's an eyesore. We can see the text that would fit the screen no need to enlarge them! jeez but thanks for the video it helps
I am taking a Cisco Class at my local Community college, and this video helped me have my "Ah HA!" Moment. Everybody teaches different, but this video series, is what helped me. Thank you, I will be sharing it with my fellow classmates.
how are you now?
It's like you get it in the first vid!! It's just naturally clicks! Then the other vidz are like supplements that show different ways to "get it". Good stuff dude.
Innovative teaching. I took this class 10 yrs ago and dropped it cuz of mundane teaching methods. Thanx for your methods.
passed my ccna on the 14th of June 2014 because of this video thanks!!!!!
Almost the entire exam relies on you knowing how to subnet. I would say 90%. I'm now looking to book my ccnp routing and switching, switch exam.
Volf Khat but when I say subnetting was a huge chunk of the exam its not just simply asking to find host numbers or broadcast addresses it's all interconnected with topics like acls natting and some routing. And yes I have done 2 part exam.
The book that I would recommend is ccna by todd lammle.
Wow, man I am taking the Cisco courses now. I already took the first one, and now am taking the second class, routing protocols and concepts. The subnetting was always somewhat difficult to understand but that magic number is THE SHIT!! That was VERY easy to understand the way you explained it, great job man. Im going to check out some of your other vids.
Just to clarify for the people who did not get why he used /25 instead of /24, /24 consists of only 1 network with 254 usable hosts, this configuration required 2 networks, with at least 123 usable hosts, due to the Teachers Network requirement. Using /24 would allow the users but not the separate networks therefore we would use /25.
thank you!!
Good explanation
Thanks for the explanation, i was racking my brain trying to figure out why it wasn't. /24
Thanks a lot.
Thanks. So 128 would be the Network ID with 2 separate networks. Confused me because 44 users plus 123 users = 167 users/hosts. 128 host isn't enough computers for the users but since 128 per network. 0-128, network ID 0 and 127 broadcast, 128 network and 255 broadcast ID. Meaning 129-254 for second network for teach network IP addresses for the last octet!
I'm very grateful to your tutorial so far sir, the tutorials had taught me better than they did teach at school
@danscourses u explain this better than my Cisco instructor! i was confused for a month on subnetting and i watch ur video and i did a *face* *palm* *head* *desk* reaction because it is simple!! lol thanks for the video :)
Hey i just wanted to thank you, This was really good, my college professor couldn't teach this very well . The magic number is a great concept.
Thanks very much for making this video, I'm just starting to do CCNA and I'm kind of struggling with it but these videos are giving me more and more insight, love the magic number bit, got that down to a regular, overall I think I just need to keep reviewing and keep going over the material. Big help thanks again bud!
Man this has to be the best explanation i have ever heard in my life great job ..
@benghaith 127.0.0.1 is your loopback address it is your own NIC. You can ping 127.0.0.1 to see if IPv4 is installed and bound to your NIC. It is Localhost
@surlagachette2 Yes that is correct, 32 host addresses but only 30 are usable.
THANK YOU SOOOO MUCH!! I've been trying to get subnetting for the last 4 days and you have made it so easy for me.. Thank You!
Thank you Dan for the video. It's very easy to follow your teaching style.
I was just trying to show that when you subnet a network address you dikvide it into smaller networks. If your goal is two subnetworks, and the most users you will need is 123 then you can divide it into 2 subnetworks of 128 hosts each. It is a hypothetical situation but useful in passing the Cisco CCNA exam
love the videos, I have been trying for the past week to learn this stuff.
Yes the magic number still tells you where the networks are (how the networks increment) even if the subnet mask is less than /24. if the subnet mask is greater than /24 the magic number also equals the number of hosts in the network
thanks for the feedback, I am glad it helped out.
You sir have blown my mind. Thank you so much.
Great subnetting tutorial! Helped me understand the magic number trick well. Thanks so much
Thank you Sir!
May you have all the success for your present and future endeavors...
Thank you, clearest explanation I've ever had on this subject...
Yes those are intended to be two different sized subnets. Students in one subnet, admins in another.
It is all based on the binary. the only way to understand IPv4 subnets is to know how binary works. Go to my CCNA1 playlist on my youtube channel and I cover the whole process.
Thank you for your videos, you helped me out so much clarifying my questions.
At 3:35 - how is 159 a usable host address? I thought the broadcast address is reserves therefore not usable as a host address?
:)I really love this video. I forgot about the magic number trick and this tutorial refreshed my memory in a matter of minutes!! Thank you:)
I like how you present the material other than I would like it if you planned your examples ahead of time. That way it would be easier for me to follow with less restructuring of your examples. It did get a little crazy in several spots. Overall I really liked it. Thanks for taking the your time to create these.
This is really great work..
Could you show one where you are just given a class B address with no netmask and were asked to create 4 subnets(or more) with different numbers of hosts on each subnet?
Dan..thanks for the info? Is the number of hosts NOT equal to the 0? eg 255.255.255.240 has MN =16 a
your very great in teaching, it make's so easy to understand subnetting. thank you so much sir. xD.
You are the best subnet teaher
Yes i learned a lot.
This was very helpful!!,thank you so much for these tutorials,all the best! :)
At the end of the video you choose /25 because it allows for 126 hosts. Do you choose this because it allows for the 123 teachers and the 44 admin. I was thinking that I would add the students and the admin for a total of 167 host, which would lead me to choose /24. Are you asking what do you need to choose for 123 teachers as well as what do you need to choose for 44 admin?
Good trick! Easy to understand, learned a lot! Thanks!!
does magic number works with anything less than /24? like if I have a subnet mask of /18, is this still applicable to my network? many thanks!!
but i am struggling for that, is it 255*subnet bit at the previous octet?
hey bro, actually its not 32 hosts... its only 30 hosts because one of them is network number and the other one is broadcast number. so u will be having only 30 hosts for every network increment.
I agree. I learned this awhile ago and time to brush up! But when doing notes it was messing with me because I recall the broadcast and network address are not useable IP's for hosts. Very important which is what i feel like is the only thing left out
At 7:40 into the video he makes the distinction between "hosts" and "usable hosts". I agree with you in how he mislabels the number of hosts, but wanted to let you know that he does clarify this issue later on.
Yeah and technically if you are subnetting, when you are anding, that the first network since its /27. if it was /24 then yes he would have that many networks
He is right there is 32 hosts.. This is how it goes "there's 32 hosts and 30 of them are usable hosts" Hope this helps.
there are 30 hosts per network, you save two of the hosts 1- for network 1- for broadcast
+reaction4me not really? 0 network adress, 255 broadcast. He says within the subnet you can use the "broadcast" adress!
end is a bit confusing are you using vlsm?
thanks for the vids my friend it helps a lot but small humble tip use "Ctrl+[" or "Ctrl+]" to control font size
Thank you very much this helps a lot better than my professor did.
8:24 he says, "Next Movie". So true. Very entertaining.
Please how did you came about with 159?
If 128 is the network and 159 is the broadcast how can you get 30 usable hosts? 129 + 30 gives you 159 but that the broadcast address?
I could never understand subnetting until I saw these videos. Thank you so much!!! Do you have any courses for CCNET 100-105 and 200-205? If you do I will sign up. I really enjoy your teaching ways.
That's great to hear Carlos. I will be teaching a full CCNA series of courses this Fall (registration begins Sept 5th) "online" through Central Oregon Community College (www.cocc.edu)
cocc.edu (CIS-151C Fall Quarter)
Cool. Now I have done online classes and they are good but usually the instructor just goes over the book material and leaves us alone to do labs. I can do that by myself. How do you teach? Is it like the videos that you do hands on labs etc?
thank you so much for this video. it's been bothering me what the /8 /24 slash whatever. This video solved my question. You've got a new subscriber! =) By far you're videos are easiest to understand.
It makes me very clear now Thank you so much
I am thinking the same thing. Why choose /25?
if the teacher network requires only 44 hosts on a separate network wouldn't be /26 good enough?
@danscourses yeah i get it, count the zero bits minus the network devices. thanks again! :D
In this example at the end....shouldn't be the total of both network...? 44 users+123 users to calculate the total host for both networks....? total users 167?
no, there are two separate networks, each needs there own network so they dont share info
brother it must be
Host's : 32-2 : 30 Right?
sorry if wrong! , but according to what i learned
hosts : its (2ⁿ - 2) Right?
Correct
If there is an error in the video I tried to point it out on annotations but UA-cam got rid of the Annotations that floated on top of the videos. Probably because Flash was used earlier
why is 159 the broadcast address?
dumb question, so the MN means the usable hosts?
It means the binary place value of the last 1 in the subnet mask (read from left to right). It tells you what the networks area, starting at 0 ( in the octet of the last 1) and going up by the magic number.
If the MN happens to be in the 4th octet, it will tell you the number of hosts in the subnet. Subtract 2 to get the usable hosts. The number zeros in the subnet mask is a better way to tell how many hosts are in the subnet. 4 zeros or 2 to the 4th power equals 16 hosts, minus 2 is 14 usable hosts
danscourses so in this tutorial, your MN is 32. means there are 5zeros left. so, its 2 to the fifth = 32 - 2 = 30 usable hosts?
am i getting it right? im really dumb. its been 2days that I keep watching your vids to get it. i appreciate the reply. thanks!
If the subnet mask is 255.255.255.224 or /27, then it is correct, because there would be 5 zeros left. and 32-2 = 30 usable hosts!
danscourses oh cool! thanks, Sir! I'm learning a lot from your vids. Thank you!
what will be the magic number when CIDR 8 or 16 0r 24 ????
1 ... :)
oh! i understood :) Thank you
Yes it works!
how would you know the number of hosts in a subnet? how would you know that there are 255 hosts in /24? 128 hosts on /25?
Sir why you have used there 24 because I am a a biginner so please reply me
Here you have 167 users and if each user is one host, why do you chose 128 hosts?
Because you can have 2 sub networks with this. 1 for Admins 1 for Teachers
Great. Thank you soo much! Finally got it!
You should lecture! My lecturers did a real bad job explaining this! Thank you!!!!
I was about to write the same, u should check that out, anyways, great Video! great help for students, greetings from Chile
Pls solve for 172.18 208.224/22 what's first valid network address?
Great Method!!! Thanks Man!
Thank you sir you made subneting easy
My pleasure, thanks for the feedback!
0-127, 128-256.... two networks 126 usable per network
so if i'm correct the xxx.xxx.xxx.0 - will always be the 1st network regardless of their class?
noob here
Confused how 126 usable hosts cover 167 total users..?
10 years and no one pointed out that a /24 actually has 256 hosts, 254 usable? Or did I miss something?
Yes Dan I see.....you are correct, thanks again!!!!
wow.thanks for the lesson
Good job though you could have done better, instead of using admin which is a broad approach in determining who is who- you should have used teachers vs students - it makes much more practical in real life situations or scenarios. The overall lesson is awesome period of instruction. I am working on my CCIE. Thanks for the refresher.
🔥🔥🔥
Good explanation but all your example are above 24, what if the (/) number is below 24. Example /22
I don't get it! You have a total of 167 users! So shouldn't it be /24 instead of your answer of /25 for 126 usable host!
I think that you are calculating the host section incorrectly. For example, a /27 would be 30 usable host addresses 2x2x2x2x2=32-2 and this is how I know it to be in any language or place.
thank you so very much!
256 - Sunbnet = Magic No
256 - 224 = 64 - 2 = 62
the 2's are the Network and Broadcast which will not use in future
for admin and teacher to be two different networks the correct answer would be /26
thank you brother
It should be "/24 256 hosts with 254 usable hosts", "/26 64 hosts with 62 usable hosts", "/27 32 hosts with 30 usable hosts".
attention to detail please!!!!
/24 256 hosts - 2 for broadcast and network = 254
your /25 @ 128 is correct so /24 should be *2 aka 256
this is what i was thinking exactly
Excuse me, but, I think that u r making a mistake here... and in the other videos before this one, when it comes to host's number ? [Host number = ((2)^(host bits)-2)] ? So in this case, there are 233 hosts for the /24, 126 host's for the /25, 62 hosts for the /26...etc.... Anyway, grate tutorials !
thanks man
You'd think that you'd have figured out that you need to use a smaller font the first time.
+SoCalGuy93065 Really? After all the effort, time and attention Dan has put forth in creating ALL these videos for those of us who DON"T know everything, THAT"S what you have to bitch about? The font? What a schmuck.
agreed, at least the discussion at the end is pretty confusing.
8 Networks/subnets refer to 2^3=8[Total number of Networks]
Isnt the Usable number of Subnets 2^3 - 2 = 6 [Usable Number of Networks/SubNets]
john doe just saw your comment but I think you are counting 1s that’s stand for network you should count on 0s of we are talking about hosts cause 1 represent network and 0 represent hosts so in this case it should be 2^5-2 😊
No hosts 2 to 5th -2 30 hosts per network
set your font to smaller size first it is very annoying to watch you changing the font and moving things around it's an eyesore. We can see the text that would fit the screen no need to enlarge them! jeez but thanks for the video it helps
not 255 hosts, but 254 usable hosts, not 128 hosts, but 126 usable hosts
Not sure what he means when he says the networks go up by 32
You know 0 32 64 96
/24 = 255 hosts is Wrong........should be /24 = 256 hosts..
again /25 -2 126 hosts.
we have 30 hosts, dont make mistakes like this!!!!!!!!!!!! put annotations so the beginners know the right answer... !!! pffff
30 hosts
Slooooooow and mistakes. you wanna try again.
/24 has 256 host and 254 usable host , Usable hots are from 192.168.1.1 to 192.168.1.254 ! Broadcast: adress is 192.168.1.255.
too slow and frustrating to follow, typing, thinking, explaining same time with poor audio sync.
Yes those are intended to be two different sized subnets. Students in one subnet, admins in another.