Why do we want to use custom subnet masks?

The custom subnet mask, also called a variable length subnet mask, is used to identify the bits used for a network address versus the bits used for a host address. Custom subnet masks are used when subnetting or supernetting.

What is difference between default subnet mask and custom subnet mask?

What is the difference between subnet mask and default subnet mask.. Subnet mask represents the number of bits used by the network and rest for host. Default mask is inbuilt network portion which is already defined in IPV4 classes. In office networks subnet mask is used.

What is the default subnet mask for?

The three default subnet masks are 255.0. 0.0 for Class A, 255.255. 0.0 for class B, and 255.255. 255.0 for Class C.

What’s the subnet mask of an IP address?

A subnet mask is a 32- or 128-bit number that segments an existing IP address in a TCP/IP network. It is used by the TCP/IP protocol to determine whether a host is on the local subnet or on a remote network.

What is the power of a subnet mask?

A subnet mask is simply a number indicating how many bits of the IP address refer to the network, and how many refer to the hosts within that network. This means that the sizes of networks for given subnet masks are always powers of 2. A subnet mask of /24 (255.255.255.0), quite possibly the most common for small networks, allows for 254 hosts.

When is it necessary to use a custom subnet?

But certainly custom subnets are used and even necessary when needing the use of a subnet in an increment between Class designation. The advantage is because of the need for, say, more IP addresses than a Class C at 256 (254 hosts). but you don’t want a full Class B at 65,536 IPs/65,534 hosts.

How are NSG rules applied to private endpoints?

NSG rules applied to the subnet hosting the private endpoint are applied to the private endpoint. A limited workaround for this issue is to implement your access rules for private endpoints on the source subnets, though this approach may require a higher management overhead.

How many IP addresses are reserved for Azure subnets?

Yes. Azure reserves 5 IP addresses within each subnet. These are x.x.x.0-x.x.x.3 and the last address of the subnet. x.x.x.1-x.x.x.3 is reserved in each subnet for Azure services. x.x.x.1: Reserved by Azure for the default gateway