The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are
two valid reasons for adopting IPv6 over IPv4? (Choose two.)

A.
no broadcast

B.
change of source address in the IPv6 header

C.
change of destination address in the IPv6 header

D.
Telnet access does not require a password

E.
autoconfig

F.
NAT

Explanation:
Six Benefits Of IPv6 http://www.networkcomputing.com/ipv6/six-benefits-of-ipv6/230500009
With IPv6, everything from appliances to automobiles can be interconnected. But an increased
number of IT addresses isn’t the only advantage of IPv6 over IPv4. In honor of World IPv6 Day, here
are six more good reasons to make sure your hardware, software, and services support IPv6. More
Efficient Routing IPv6 reduces the size of routing tables and makes routing more efficient and
hierarchical. IPv6 allows ISPs to aggregate the prefixes of their customers’ networks into a single
prefix and announce this one prefix to the IPv6 Internet. In addition, in IPv6 networks, fragmentation
is handled by the source device, rather than the router, using a protocol for discovery of the path’s
maximum transmission unit (MTU).
More Efficient Packet Processing IPv6’s simplified packet header makes packet processing more
efficient. Compared with IPv4, IPv6 contains no IP-level checksum, so the checksum does not need
to be recalculated at every router hop. Getting rid of the IPlevel checksum was possible because
most link-layer technologies already contain checksum and error-control capabilities. In addition,
most transport layers, which handle end-to-end connectivity, have a checksum that enables error
detection. Directed Data Flows IPv6 supports multicast rather than broadcast. Multicast allows
bandwidth-intensive packet flows (like multimedia streams) to be sent to multiple destinations
simultaneously, saving network bandwidth. Disinterested hosts no longer must process broadcast
packets. In addition, the IPv6 header has a new field, named Flow Label, that can identify packets
belonging to the same flow. Simplified Network Configuration Address auto-configuration (address
assignment) is built in to IPv6. A router will send the prefix of the local link in its router
advertisements. A host can generate its own IP address by appending its link-layer (MAC) address,
converted into Extended Universal Identifier (EUI) 64-bit format, to the 64 bits of the local link prefix.
Support For New Services By eliminating Network Address Translation (NAT), true end-to-end
connectivity at the IP layer is restored, enabling new and valuable services. Peer-to-peer networks
are easier to create and maintain, and services such as VoIP and Quality of Service (QoS) become
more robust. Security IPSec, which provides confidentiality, authentication and data integrity, is
baked into in IPv6. Because of their potential to carry malware, IPv4 ICMP packets are often blocked
bycorporate firewalls, but ICMPv6, the implementation of the Internet Control Message Protocol for
IPv6, may be permitted because IPSec can be applied to the ICMPv6 packets.