4A0-101 Exam - Question 43

6over4 is a mechanism to deliver IPv6 packets over an IPv4 infrastructure, using IPv4 as a transport layer. The CE (Customer Edge) routers typically only need to run IPv6 since they connect IPv6 networks to the IPv4 transport network. PE (Provider Edge) routers must run both IPv4 and IPv6 because they facilitate communication between the IPv6 domains and the IPv4 network. IPv6 routes on the PE routers may have an IPv4 address as the next hop since they need to route packets through the IPv4 network. However, P (Provider) routers in the core network carrying the tunneled traffic only need to understand IPv4 since they treat these packets as regular IPv4 packets. Thus, it is false that P routers must run both IPv4 and IPv6.