A 'site' is an area of organization in Microsoft's Active Directory organization. It is used to keep links (such as WAN links) together. A site is a physical organization (as opposed to a logical organization such as an OU or domain) and is specified by a subnet.
The site below has a fairly good explaination of the uses of subnet masks.
Site, Subnet, and Site Link
Subnet
It excludes subnet information from the routing updates
A Subnet calculator is used for determining the attributes of an IP subnet including the start of it. Results of the subnet calculation include the access control lists, the subnet range and the subnet bitmap.
No. 192.168.12.1 - 192.168.12.254 is one subnet (assuming 255.255.255.0 subnet mask)
If you divide a net into several subnets, subnet-zero is the first subnet. Some older technologies don't allow the use of this first subnet.If you divide a net into several subnets, subnet-zero is the first subnet. Some older technologies don't allow the use of this first subnet.If you divide a net into several subnets, subnet-zero is the first subnet. Some older technologies don't allow the use of this first subnet.If you divide a net into several subnets, subnet-zero is the first subnet. Some older technologies don't allow the use of this first subnet.
The default subnet would be 255.0.0.0 (class A)
datagram subnet is connection oriented network.
It does not require a subnet mask.
No, all subnets must use the same subnet mask
Moving a subnet to left to save bits is known as a supernet.