Diff b/w Routing protocols & WAN protocols

#1

What is difference in Routing Protocols and WAN Protocols like PPP & HDLC? However, Routing protocols are also configure in WAN Topology.

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#2

PPP & HDLC are encapsulations , Your Ipv4 Packet is going in PPP & HDLC Frame.
Serial links are not using Ethernet technology they use PPP & HDLC to take IP in L2 Frame.
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Routing Protocols are used to exchange the Prefix/Routes among Routers eithers routers are connected to ethernet cable or serial cable.

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