The difference between CIDR and VLSM

• When polymerization using CIDR address, network-based IP address bit that there are used as part of the host bits set aside.
• When using VLSM subnetting, the original IP address with a class host bits as bits needed to draw a portion of the network.
• CIDR: subnet mask to the left shift mask netmask shortened.
• VLSM: move to the right subnet mask, mask netmask increased.
• There are several classes CIDR the synthesis of a large network of networks (Ultra Network), the routing address for the polymerization.
• VLSM a class is the network into several small networks (subnets), for a more efficient subnetting.