The maximum number of the logical drive that can fit on a physical disk is 24, while the extended partition can only have 23 logical drives.
RAS is truly a local area connection between two connections whereas, VPN is a local connection spread over large area.
Default gateway is the IP address of the router in the network. In any case, if the users wants to switch on to another network, or if they cannot locate their particular network than their query will be forwarded to default gateway.
When one or more computers work together as a single system by sharing their resources is known as clustering. The benefits of clustering are that it reduces the load on one single system by sharing the load also it is used for redundancy of the services.