How to calculate the total number of the usable host IDs?

[@familyfunshots]

Thank you so much! I finished my Network Fundamentals Class, and then got Covid... so the longer I am away from reading and studying the more information gets dumped. So I have lost about 60% of what I learned and am reteaching myself after a month of recovery. Your video was so simplistic and on target that everything just started falling into place! Thank you!

[@javrodriguez2010]

Sunny, thanks my man! lol I have a book, and other materials that I have bought to study, for my Network + Exam N10-008. Where I just needed a little bit more visual on (Calculating Host.) Your video, did the job! Really, thank you for your efforts, and the time that you took to make this video. Much appreciated!!!

[@haileyr2264]

i wish i knew about your videos sooner this is a lot easier to understand and attention grabbing than to read a text book (i guess its just my learning style)

[@SpawnSniper]

no, he just explains it really well. Other professors explain it as if we already know what they are talking about .

[@kevinlichtenberger4612]

Awesome video! This was very helpful in understanding how total IPs of a network are found. Thanks

[@JumaPhiri-mo4nj]

Thanks sunny!! your video have gone a great job

[@juliadow5400]

Thank you so much! You are a lifesaver

[@SpawnSniper]

no clout, your a really good professor, I come here when my other professors make 0 sense.

[@marcosalano7769]

What a beautiful Sunny day!!!

[@sunnyclassroom24]

Thank you for watching!

[@anisurrehman8861]

Dear Sir, I like your class very easy to learn for aged person who wanted to learn network quickly- I find only your class made me learn networking - best in world

[@S4nderr]

Sunny you are the man!

[@rm9994]

Thank you sunny you are excellent. One question. Sometimes binary starts with 1 and ends with a max of 128. In this video it starts with 2 and goes to 256? Thank you

[@xinong01]

two thumbs up!

[@714lmfao]

Thank you, sir!

[@sunnyclassroom24]

You are welcome!

[@Lucad2278]

Thanks so much. I have a question if I may. In the formula h = 2^ - 2 where does the first 2 comes from? Is it because of binary or something?

[@scottzeta3067]

binary, imagine you have a 3 digits decimal password locker, is 10^3. Then the same combination with a binary locker, 2^3.

[@Lucad2278]

@@scottzeta3067 awesome. That makes sense. Thank you very much. Cheers

[@Lucad2278]

@@scottzeta3067 I got another question please. Last one I promise! 🤗 Let's assume we got a /26 subnet. Now if I want to work out the total number of subnets (as in subnetworks) in a /26 that's easy done by using the usual formula 2^18 (18 in this particular case given the 18 bits in the mask) which gives me a total of 262,144 usable subnets. However in a /26 you only get a total of 4 possible networks. So based on that, what's the difference between a subnetwork and a network? I can't really find anything that really explain the difference and if you google it you get the typical results showing the cheatsheet and stuff like that which doesn't really answer the question. Any suggestions would be much appreciated. I said it in another post and I'll say it again bloody CCNA! 🤣

[@scottzeta3067]

@@Lucad2278 Well, I am not sure whether I understood your example, since I am a student learning this for only one day. But I think subnetwork and network are relative and hierarchical. Such as city’s network is a subnetwork of a state network and a suburb network is a subnetwork of a city’s. Just like a Pyramid. Hope you could find more reliable answer.🤨

[@Lucad2278]

@@scottzeta3067 thanks mate I appreciate your help

[@OmarAhmed-zj8mg]

Thanks

[@goli4tube]

do you published a video about broadcast ID ???

[@sunnyclassroom24]

Special and private IPv4 addresses, I talk about broadcast ID. kzbin.info/www/bejne/goupp2ykjMuapKM but other videos such as Address Resolution Protocol and DHCP, I talk about how broadcast ID is used. How DHCP works? kzbin.info/www/bejne/f4ayh4Z_gM9pfbc ARP- kzbin.info/www/bejne/hKHMgIV8rd6AasU

[@LetsBeHuman]

This is why you should number your videos in sequential order. It also helps newbie which videos to watch after which one.

[@win30034]

@@LetsBeHuman You are an ungrateful brute. Sunny did it, you can number it.

[@AndersJackson]

@@LetsBeHuman there are Video lists for this. But yes, you still have a point.

[@chavarharris8244]

network class A,B and C.

[@AndersJackson]

Is has been obsoleted for about 30 years. We all uses Classless routing (CIDR, which is when you uses netmasks) now. Yes, I used Classfull Internet routing when I set up "my" first IP network with routing (yes, it was before 1993). But then we only knew it as routing. :-) See en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

[@moerocco7954]

Where does the first 2 come from as in 2 to the x power?

[@charliebrown7328]

you are subnetting a binary subnet mask so obviously you need to use the 2 which represents the binary digits.

[@jacobmembrino6203]

I wanna know who the 18 people are who disliked this video (I just wanna talk to them)

[@AndersJackson]

Just ignore them.

[@battyforpumpkins]

Sunny, I was really lost in my networking class until I watched your videos. Thank you very much!

[@ianamran3039]

sunny classrooms has my networking study easier, thank you so much sir

[@sunnyclassroom24]

You are welcome, Ian.

[@ianamran3039]

thanks but please if you will do th videos on designin, configuration, routing and testing, it will be much better, thanks@@sunnyclassroom24

[@EfrainRiveraJunior]

This was VERY useful, thanks.

[@justcurious1940]

what if the given Mask is on base 10, how can u calculate the total number of usable hosts ?

[@men2301]

Thank you, helped a lot

[@w5755]

Thank you

[@DarioCruzII]

Sunny you are the best. Thank you so much.

[@sunnyclassroom24]

You are so welcome!

[@basherdawar8272]

Hi what software do you use for you presentation

[@sunnyclassroom24]

flash

[@SpawnSniper]

no clout, your a really good professor, I come here when my other professors make 0 sense.

[@moxieyaro]

What if the subnet mask is not given, how can we identify usable IDs ?

[@AndersJackson]

You can't. IF there are no netmask, you have to consider the whole IPv4-address as one unit. Because you can't know what others have set the netmask to, as that can be set arbitrarily to divide one network into many subnets. That is up to the owner of the large network to decide. You really only need to know the netmask of the addresses YOU have. That is because netmask is used to decide if an IPv4-address is on same networks as you are and have IPv4-addresses in. So you know if you can talk directly to the machine, or if you need to connect through a router. So you don't need to know other IPv4-addresses netmasks.

[@shahzebkhan794]

what incase of single '0'?

[@ronthedon3106]

Yesssssssss my guy👍👍👍

[@ahmedareem9599]

thank you, Sir

[@wilfredocan9959]

many thanks for lesson, could you please brief me on the differences between Network id , Host id and Broadcast id ???

[@sunnyclassroom24]

network ID is ID for a local network, like zip code for a city. Host ID is for computers or other devices, like residence's mailing address in a city. Broadcast ID is used to broadcast within a local network. It is like someone shouting loud to a classroom : "hello, everyone". Everyone can use it for broadcasting. If you use broadcast ID as destination ID, everyone else can get your message.

[@vaja5357]

@@alessandra1997 Subnet mask has nothing to do there. the very first host ID is the network itself so that's -1. then, the last host ID is used as the broadcast ID. subnet mask is not using up any space in the host range, it is just there to represent how many hosts and which, you can use.

[@AndersJackson]

Think of Internet as a large school. Network address with netmask (NetID) selects which classroom you uses. Each sitting place in the room has a NodeID. And as Sunny wrote, the Broadcast address is used to talk to all in that classroom. Like 192.168.42.16/28 (that is 16 places because of the netmask /28). Room number is the Network address which is 192.168.42.16 (NodID is 0). First chair in that room is 192.168.42.17 (Chair/NodID is 1) Last chair in that room is 192.168.42.30 (Chair(/NodID is 14) Addessing all chairs can be done with 192.168.42.31 (broadcast address with Chair/NodID 15) Address 192.164.42.15 is a chair in previous classroom, and address 192.168.42.32 is a chair in next classroom (according to the netmask). Notice that the netmask is not on an even boundery of 8 bit, as /24 is. Write this down on paper in binary form if you want to understand how this can be. Or use the command 'ipcalc 192.168.42.16/28' in a Linux computer.

[@ennyjoe1]

Please how did you get that 256

[@6StringPsychedelic]

its x2 8 times to get 256 .. then -2 for the reserved ips makes it 254... Theres 8 zeroes so it doubles for every 0. doubling like that is called exponential. Its not 2x8, its double 2, eight times.. Hope that makes sense

[@AndersJackson]

As Jeff wrote, each poition from left to right in a binary number is double the previous one. Basically like in our decimal numbers (decimal = 10), where each next digit is 10 times larger then the previous one (to the right). So. Base 10 (decimal number, decimal=10) 234 = 4*(10⁰=1) + 3*(10¹=10) + 2 * (10²=100) = (revers order like the number) = 2*100+3*10+4*1 = 234 decimalt. Base 2 (digital number, digital=2) 11010 = 0*(2⁰=1) + 1*(2¹=2) + 0*(2²=4) + 1*(2³=8) + 1*(2⁴=16) = (revers order like the number) = 1*16+1*8+0*4+1*2+0*1 = 16+8+2 = 24 decimalt. OR Binary number too decimal number 1 = 1 10 = 2 100 = 4 1000 = 8 10000 = 16 100000 = 32 etc