Subnetting - Classful Netmasks - part1

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  • Опубліковано 24 гру 2024

КОМЕНТАРІ • 42

  • @danscourses
    @danscourses  14 років тому

    @BlackPinUpDoll1 Thanks for the feedback. I am glad it is helping!

  • @danscourses
    @danscourses  13 років тому +1

    @bigr5150 the second subnet's network address is .128 and the first usable host is .129
    Your gateway will be the ip address of the next hop router, it is not a specific address number. VLSM just means when the subnets are different sizes. Look up VLSM and you will find my video.

  • @danscourses
    @danscourses  13 років тому

    @bigr5150 Sure no problem, it sounds like you need a subnet within a subnet or VLSM. Your first subnet could be 192.168.7.0 /25 (128 hosts) and your second subnet could be 192.168.7.128 /26 (64 hosts). I am guessing your gateway/default gateway question is in regards to a router. It depends on where you want your router to send traffic when it doesn't know the destination network. If you dont set up a Default GW then packets to unknown nets will be dropped

  • @danscourses
    @danscourses  13 років тому

    @mauroprovatos My guess is for classful routing, routers and computers are able to calculate default network masks based on an ip address' first order bits. For instance If the address starts with a 110 the netmask will be /24, 10 will be /16 and 01 or 00 will be /8

  • @Coo1On3
    @Coo1On3 12 років тому

    Dan you're awesome, the magic number really work. your technique for subnetting is really easy and understandable! I saw 3 times this video (and your others) and I even can subnet in my mind with your technique. AWESOME.

  • @Subparanon
    @Subparanon 12 років тому

    In general the default gateway is chosen as the first usable IP address. Since the first IP is usually the network, the default gateway is usually the second IP in the range. IE for 192.168.7.0/25 your default gateway would be 192.168.7.1 for subnet 1 and 192.168.7.129 for subnet 2. If you followed Dan's suggestion and made subnet 2 a /26 your gateway IP's would be 192.168.7.129 for subnet 2, 192.168.7.193 for subnet 3 etc using the 64device /26 subnetting scheme.

  • @danscourses
    @danscourses  12 років тому +1

    Yes correct. if you use a slash 255.0.0.0 subnet mask on a class C address then it is not a classful scenario

  • @b2bold
    @b2bold 9 років тому +1

    Great presentation, are there any plans for a video on "Custom Subnetting"

  • @dalefirmin2159
    @dalefirmin2159 6 років тому +1

    Class C subnets begin the first octet with 192 through 223, so 194 and 200 would be Class C. You would have some pretty bizarre routing if you applied a Class A or Class B subnet to a Class C network.

  • @awaqar2
    @awaqar2 12 років тому +1

    Hi, could you please help me out with this question
    Suppose you were given the IPv4 network block 137.73.64.0/20. Using variable length subnetting, divide the network block in order to provide the following subnets:
    1. A, with at least 1800 hosts
    2. B and C, with at least 500 hosts each 3. D, E and F, with at least 240 hosts each

  • @bigr5150
    @bigr5150 13 років тому

    @danscourses ok i have the 1st subnet right, but i thought the 2nd was going to start at 192.168.7.129/25. how do i make the subnet within a subnet or vlsm, do u have a video showing that? also do you have to use a specific address for gateway/default gateway?

  • @bigr5150
    @bigr5150 13 років тому

    @danscourses i think i c, you have to add the first set of borrowed bits to the second set of borrowed bits and use that number to create ur addresses.

  • @awaqar2
    @awaqar2 12 років тому

    Give the addresses, in CIDR dot-decimal notation, of each of the subnets, indicating how many host addresses are actually available in each. If there is any block of addresses not used make sure to indicate its range.

  • @ayshortier
    @ayshortier 9 років тому

    Great job there Dan, don't forget to tells us how many subnets and hosts at the end of each problem for each of those IP addresses.

  • @bigr5150
    @bigr5150 13 років тому

    could you give me a hand with subnetting192.168.7.0/25 into two subnets A-with 110hosts and B-with 54hosts? i thought i had it but in my lab host B subnet mask has .192 (last octet) when i thought it was suppose to be .128. also i dont get what determines the gateway/default gateway.

  • @anjaneya2
    @anjaneya2 12 років тому

    one doubt... when we say classful masks 192.168.0.1/24 is classC, but 192.168.0.1/8 is not classA then why /8 is classful mask even 192.168.0.1 is class C, actually it should be classless right?? Could you please clarify on this

  • @mauroprovatos
    @mauroprovatos 13 років тому

    the 200.0.0.0 network is class A,according to the subnet mask
    but class C according to the significant bits of the 1st octet since 200 (dec) is 11001000(bin)
    what's up with that?

  • @KINGofkings49er
    @KINGofkings49er 7 років тому

    What about a network between the two routers??

  • @omartaffish7567
    @omartaffish7567 9 років тому

    Ineed The Second Part haw can i found it

  • @ZTsarmadOne
    @ZTsarmadOne 2 роки тому

    Thanks 😊.

  • @widebandrecords902
    @widebandrecords902 8 років тому

    Great vid Dan, been with ya for many years big brother, some of us have understood this since protocols were emerging, why don't the big companies get it? you would be a great teacher for many of the leading web businesses, they have not a clue, they use plug n play into monsterous power hungry computer stacks leaving all virtualisation processes minimalistic and leaving us to better the services they sell to us to the point where i have helped others in slow net regions to use virtualbox on win7 + with win xp as guest then use router tools or more adevanced the gns3 way to use vlan to provide net to inner networks, yes emulation is no way better than physical hardware but when options are very limited it gives one time to learn that networks are very simple but can seem very hard to understand if the simple basic things have not yet been learned. L

    • @danscourses
      @danscourses  8 років тому

      +Wideband Records (wb-recs) Thanks for all the feedback. Much appreciated.

  • @Papulin
    @Papulin 2 роки тому

    W Professor!

  • @MrTBDude
    @MrTBDude 5 років тому

    Dude your killing me

  • @hillmyrnarose
    @hillmyrnarose 2 роки тому

    I think subnetting has changed since this video was produced.

  • @bigr5150
    @bigr5150 13 років тому

    @danscourses i will, thanks again.

  • @kanishq8477
    @kanishq8477 11 років тому

    Gr8 vedio sir !!!!!

  • @kenjiswb1499
    @kenjiswb1499 9 років тому

    Great lecture!

  • @jhordanmeneses6170
    @jhordanmeneses6170 5 років тому

    the video part are not continues, part 1 next is part 3

  • @pwstroud
    @pwstroud 14 років тому

    Love this video!!!

  • @TheSwapnilmahajan
    @TheSwapnilmahajan 7 років тому

    Cyberoam NetGenie NG11EH please upload videos this device using VPN create server side ( 3 user created locally​ on server)& client side go to remote desktop app. through connect to server user and screen not off that time choose username and enter password , both sides dynamic internet's which calling likes that configuration and which devices​ uses.

  • @acidraindrops6657
    @acidraindrops6657 5 років тому

    254 is the last usable

  • @kakarotosayayin6952
    @kakarotosayayin6952 9 років тому

    thanks

  • @fogjungza
    @fogjungza 13 років тому

    I don't understand.

  • @chesperacueto1935
    @chesperacueto1935 7 років тому

    did he just say lets finish this to the next movie? hahahaha

  • @fillemonnime458
    @fillemonnime458 7 років тому

    hi guys any one to give me the subnets of 172.16.48.0/20

  • @VimalNadaras
    @VimalNadaras 7 років тому

    wrong A class cannot stat with 200

    • @danscourses
      @danscourses  7 років тому

      I think I was only referring to the subnet mask as being a /8 class A subnet mask

  • @AhsanKhan-gs2cw
    @AhsanKhan-gs2cw 8 років тому +2

    wrong subnet mask because u r giving c class ip with a class mast.. go and read again for subletting

    • @MosestheMuslim
      @MosestheMuslim 6 років тому

      Fuck Islam and Muslims And your point is?

    • @Badjazy
      @Badjazy 5 років тому

      This is correct though.

  • @hellioringos2308
    @hellioringos2308 7 років тому

    this guy is hot, i want him to be my teacher :P lol