Which two options are two of the built-in features of IPv6? (Choose two.)
A.
VLSM
B.
native IPsec
C.
controlled broadcasts
D.
mobile IP
E.
NAT
Explanation:
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel.html
IPv6 IPsec Site-to-Site Protection Using Virtual Tunnel Interface
The IPv6 IPsec feature provides IPv6 crypto site-to-site protection of all types of IPv6 unicast and
multicast traffic using native IPsec IPv6 encapsulation. The IPsec virtual tunnel interface (VTI)
feature provides this function, using IKE as the management protocol.
An IPsec VTI supports native IPsec tunneling and includes most of the properties of a physical
interface. The IPsec VTI alleviates the need to apply crypto maps to multiple interfaces and
provides a routable interface.
The IPsec VTI allows IPv6 routers to work as security gateways, establish IPsec tunnels between
other security gateway routers, and provide crypto IPsec protection for traffic from internal network
when being transmitting across the public IPv6 Internet.
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-mobile.html
Mobile IPv6 Overview
Mobile IPv4 provides an IPv4 node with the ability to retain the same IPv4 address and maintain
uninterrupted network and application connectivity while traveling across networks. In Mobile IPv6,
the IPv6 address space enables Mobile IP deployment in any kind of large environment. No
foreign agent is needed to use Mobile IPv6.
System infrastructures do not need an upgrade to accept Mobile IPv6 nodes. IPv6
autoconfiguration simplifies mobile node (MN) Care of Address (CoA) assignment.
Mobile IPv6 benefits from the IPv6 protocol itself; for example, Mobile IPv6 uses IPv6 option
headers (routing, destination, and mobility) and benefits from the use of neighbor discovery.
Mobile IPv6 provides optimized routing, which helps avoid triangular routing. Mobile IPv6 nodes
work transparently even with nodes that do not support mobility (although these nodes do not
have route optimization).
Mobile IPv6 is fully backward-compatible with existing IPv6 specifications. Therefore, any existing
host that does not understand the new mobile messages will send an error message, and
communications with the mobile node will be able to continue, albeit without the direct routing
optimization.