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- How do you calculate the prefix, network, subnet, and host numbers?
28 Part 1 of 2 IPv4 Math With an IPv4 address and the network mask, the network mask length, or host mask, you can calculate the Network Address, Broadcast Address, Total Addresses, Usable Addresses, First Usable Address, and Last Usable Address It cannot be stressed enough that you must do IPv4 math in binary
- ipv4 - The slash after an IP Address - CIDR Notation - Network . . .
The slash following the IP address is the abbreviation for the subnet mask The binary version of a subnet mask is going to be comprised of ones and zeros just as the binary verison of an IP address would be, however, the ones in a subnet mask are all consecutive The amount of ones in the subnet mask is equal to the number of the abbreviation For example, the 16 subnet mask you asked about
- What is the practical use of a 31 CIDR or 255. 255. 255. 254?
With a 31 subnet, we are left with zero usable hosts The 31 subnet only has two hosts - one for network and another for broadcast I am wondering why would someone ever use this subnet
- different network mask and subnet mask and netmask
Simply put, network and subnet are really the same thing if used as nouns, but network is more appropriate today as a noun, and subnet as a verb A network or subnet mask is the same thing because there are no more predefined network classes This two-part answer explains about it, and there is even a section on the deprecated network classes
- Can a subnet mask contain zeros between ones? [duplicate]
The prefix length denotes the number of leftmost bits set to 1 in the mask, so a prefix length of 24 denotes a mask of 255 255 255 0 Prefix lengths are contiguous and there is no way to specify a non-contiguous mask
- Communication between different subnet MASKS with IP address that works . . .
ARP requests do not include any data about subnet masks, so there is no way for Host B (or A) to know that the other host has a different subnet mask at this point Host A now has Host B's MAC address, and will send a layer 2 frame with her MAC address as the source and his MAC as the destination, which the switch will happily pass along
- subnet - How to find number of borrowed bits in subnetting - Network . . .
The borrowed bits are the host bits in the default subnet mask that are used for network in the custom subnet mask In your example: Last byte of the default subnet mask: Binary Decimal 00000000 -> 0 Last byte of the custom subnet mask: Binary Decimal 11110000 -> 240 The first four (4) bits go from host to network, they are borrowed bits It can be understood easily using CIDR notation
- subnet - What is the purpose of subnetting, if we have NAT? - Network . . .
A class C address had a default subnet mask of 255 255 255 0 meaning 24 bits decide which network and the last 8 bits are for the host With 8 bits for hosts you could have 2^8 - 1 = 254 IP addresses that are part of the same network
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