General CCNA

This is the most common devices for interconnecting the local area network. The Switch provides the bridging functionality with greater efficiency and act as a multipoint bridge to connect devices in a local area network. Switch looks each data unit it received and determines from a physical address that is the MAC address, for which [...]

VLSM (Variable Length Subnet Mask) is simply a subnetting a subnet. After the network address is subnetted, those subnet can be further subnetted.VLSM is a sub-subnetting.
In routing protocols RIP v1 or IGRP not use VLSM means there is no field defines for subnet information in these protocols. This is called classfull routing. RIP and IGRP [...]