What is enabled by default on Cisco IOS-XR routers and cannot be disabled?

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What is enabled by default on Cisco IOS-XR routers and cannot be disabled?
A . SSH server
B . Multicast routing
C . IPv4 and IPv6 CEF
D . IPv6 routing
E . CDP
F . BFD

Answer: C

Explanation:

Before using the BGP policy accounting feature, you must enable BGP on the router (CEF is enabled by default).

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