Introduction to WANs (Wide Area Network)

Hello Team,

My question is about physical connections for the WAN and WAN Technologies.
I am pretty confuse on this section because we usually don’t see the physical connection type for the different WAN technologies.

  • I wanted to know the different physical connections types available for the WAN?
  • Can Ethernet be used for WAN?
  • What is DWDM?
  • When we say Ethernet for WAN, does it mean only Fiber?

For instance, MPLS is a WAN Technology, at the edge we have the Customer Edge Router and Provider Edge Router. What kind of physical connection can we use from the CE to the PE router?

For a PPP (Point-to-Point Protocol), I know we can use Serial Links, are there any other physical connection available? Does Ethernet work? I remember there is an extension for this protocol which is PPPoE. It encapsulates PPP over Ethernet, right? When they say it encapsulates PPP over an Ethernet frame, it means they will use SRC and DST MACs?

WAN Technologies : MPLS, PPP, DMVPN
Old WAN Technologies: Frame-Relay, ATM

  • Are there any other WAN Technologies?
  • Which WAN Technologies do we use for VoIP and Fiber Channel (Storage) traffic?

Regards,