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Cisco Certified Network Associate (CCNA) · Cisco
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why is anyone chosing 'A" changing the answer from asychronous to asymmetric? Asynchronous Routing Protocols: Also known as distance vector routing protocols. Exchange routing information periodically at set intervals, regardless of whether there are changes in the network topology. Use simple metrics like hop count to determine the best path to a destination. Examples include RIPv1, RIPv2, IGRP, and EIGRP (which has characteristics of both distance vector and link-state protocols). Dynamic Routing Protocols: Also known as link-state routing protocols. Exchange routing information immediately or in response to changes in the network topology. Use more complex metrics (e.g., bandwidth, delay, cost) and detailed network topology information to calculate optimal paths. Typically have faster convergence times and better scalability than asynchronous protocols. Examples include OSPF, IS-IS (Intermediate System-to-Intermediate System), and BGP.
I think A&C is correct. But "Asynchrnous routing" is the wrong term. I think they mean something like Asynchronous Transfer mode. So you can split your traffic via 2 lines, maybe Frame Relay and Internet.
C and E