LAN	WAN
Definition:	LAN (Local Area Network) is a computer network covering a small geographic area, like a home, office, or group of buildings	WAN (Wide Area Network) is a computer network that covers a broad area (i.e., any network whose communications links cross metropolitan, regional, or national boundaries
Example:	Network in an organisation can be a LAN	Internet is the best example of a WAN
Ownership:	Typically owned, controlled, and managed by a single person or organization	WANs (like the Internet) are not owned by any one organization but rather exist under collective or distributed ownership and management
Technology:	Tend to use certain connectivity technologies, primarily Ethernet and Token Ring	WANs tend to use technology like ATM, Frame Relay and X.25 for connectivity over the longer distances
Data transfer rates:	LANs have a high data transfer rate	WANs have a lower data transfer rate as compared to LANs
Geographical spread:	Have a small geographical range and do not need any leased telecommunication lines	Have a large geographical range generally spreading across boundaries and need leased telecommunication lines
Connection:	one LAN can be connected to other LANs over any distance via telephone lines and radio waves	Computers connected to a wide-area network are often connected through public networks, such as the telephone system. They can also be connected through leased lines or satellites
Set-up costs:	If there is a need to set-up a couple of extra devices on the network, it is not very expensive to do that	In this case since networks in remote areas have to be connected hence the set-up costs are higher

Sharepoint - Can not add the user because a user with that name already exists

Q." How to add the user?

In Share point - Go to - Site Settings - Site Administration Under Site Collection Administrator - View Site Collection user information and delete the user from there. Then add the user back

You cannot remove the owners from the list of Web site collection administrators. " cannot delete myself as the owner of a site collection Symptom When you try to delete the owners of a Web site collection, you may see one of the following messages: You cannot delete the owners of a Web site collection. You cannot remove the owners from the list of Web site collection administrators.

You cannot remove your own account from the Site Collection Administrators group. Contact another site collection administrator or the server administrator and request that your name be removed from the Site Collection Administrators group.

Goto the central site administration and change the site collection owner (be sure to add an email address for the site collection owner)