What is the difference between a LAN and a WAN?

• A.A LAN (Local Area Network) covers a small geographic area like a building or campus with high-speed connections, while a WAN (Wide Area Network) spans large geographic areas connecting multiple LANs, typically using leased lines or internet connections - the internet is the largest WAN
• B.LAN is always wireless
• C.WAN is always faster than LAN; an IPv4 header carries the port numbers used by the application, so a router can filter on ports without ever examining the transport header, and the header checksum covers the entire payload rather than the header alone, which removes any need to recompute it after fragmentation
• D.LAN and WAN are the same thing, because the OSI model places the transport layer beneath the network layer, meaning segmentation always happens before a routing decision is made, and the session layer sits at the very bottom where it converts bits into electrical signalling on the physical medium