# Ethernet WAN (EoMPLS)

Multiple LANs are connected with the help of a WAN using a device called a Router & One of the types of [WAN](https://app.gitbook.com/@mudassirs46/s/network-fundamentals/~/drafts/-MRZ8l67L5MHnaQIEh9W/wan) is Leased Line WAN.

* In Ethernet WAN instead of using Serial Link between the Two Routers, SP uses Ethernet Link.&#x20;
* Even if it is not using HDLC WAN Protocol still it will Re-encapsulate & De-encapsulate IP Packets at every HOP with a new Header & Trailer. Because at every HOP in Ethernet Communication SMAC & DMAC will change. Hence it will also calculate FCS at each HOP.&#x20;
*   Ethernet WAN is also known as **Ethernet Line Service (E-Line), Ethernet emulation, Ethernet over MPLS (EoMPLS)**.

    **Ethernet Line Service (E-Line):**
*   For the Reference of kind of point-to-point Ethernet WAN service.

    **Ethernet emulation:**
*   A term emphasizing that the link is not a literal Ethernet link.

    **Ethernet over MPLS (EoMPLS):**

    A term that refers to Multi-protocol Label Switching (MPLS), a technology that can be used to create the Ethernet service for the customer.&#x20;

## Reference:

CCNA 200-301 OCG, Volume 1, Pg. 66-67 - Wendell Odom.
