In short, the main deferences is in the Physical layer and Datalink layer. The protocols and hardware/cables used are different. For example, In Datalink layer, LAN can use 802.3/Ethernet while WAN can use HDLC, Frame Relay etc..
A router can have both WAN and LAN ports, which is usually the case.
@Truesdq, you have to read, and that is the key to must of your answers. There is a huge literature review on networking that you can go through. And you will find out that you will not even need to ask some questions. Most of the questions you ask are basic concept related. Mostly at forums like this you iron out technical field issues that seems up-side-down to you, And people will respond from experience. Have a nice time
what you thinking that i hadn't read!!!?!!!
but actually i need someone who can share his practical knowledge if he has, because books usually making your focusing on the topic theoretically. i don't mean book can't improve us but not 95% to 99.99% for these remaining % we need some1 to make our concepts where little confusions stop to proceed...
i was asking about ip and mac addresses, the use of these both in single LAN and i was improving my concept about these through internet communities either some1 has the practical concept to make it clear 2 me...
you know thiz t00 interesting that i was getting different answers from different users and my concept was improved upto great extent...
i am very thankful to all those guys whoz sharing their knowledge
and God Bless them...Ameen
what you think i shoudn't ask and make clear my concept where i feel confusions and needed some1 to help me if i don't find any1 local arround me!!!
(sorry for long assay)