Difference between serial & ethernet interface.

Hi every one,
i have some doubts in basic stuffs.
Q1: What are the differences between serial interface and ethernet interfaces.
Q2: Can we use ethernet interfaces to terminate WAN connectivity just like serial.Why always we are using serial interfaces to connect the WAN.
Please help me out by answering these questions.
!!!!THANKS IN ADVANCE!!!!!

Hi There,
   Good explanation by Navin.
   On top of that, Serials are by nature flexible and it can be comfortably devided like per customer or provider needs from T1 or E1 connection.
   So the Bandwidth allowed to have physical pipe can be clearly configured and adjusted because of TDM structure each T1 or E1 is multiples of 64 kbps slots ( example :- 64 x 32 fpr E1 which 2048 Kbps or 2 Mb circuit) same follow for T1. This is good to have exactly what we run when designing Layer 3 Routing, so Routing protocols can take Routing decisions based on Bandwidth provisioned automatically or adjust with Policy based Routing.
   When it comes to FastEthernet the original build was for LAN connectivity. Of course we can use for MAN or WAN because of multilayer aware of transmissions capability is already rocking in Market. Because of Switching and Routing enhancements ( merge ) and many devices are aware of Layer 2 to 7 traffic patterns in many vendors. So it is difficult to clearly define the scope for these two types these days.
   Hope you got some clarification !
   Happy Reading

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>
goutham p wrote:
> Hi,
>
> Can anybody explain the difference between Serial numbers and Batches. Which business process use these and their advantages.
>
> Rewards for the right answers.
>
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>
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> Hi,
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