you must be new to these types of questions and answers. The reason it's done is because some answers can be incorrect and the more ppl input you get a better idea if the answer is valid or not.
Also, if you see different answers from different people, you will try to research, investigate, and then give a good opinion and feedback to everyone interested in the question!!!!!
For anyone that read @dave1992 comment, don't worry! The reason people doing it is because there is a lot of INCORRECT answer especially from #423 - #1057 ( I haven't check anything after that yet).
So the more people COMMENTING it, the more it help others validate the answer so when you sit on the actual exam you know you got it right.
this user @dave1992 here is just being a Smart As*.
the saying goes: if you can't contribute positively, then just shut the F up.
C is correct
SLAAC is a feature of IPv6 that allows devices to automatically configure their own IPv6 addresses without the need for a central server.
When SLAAC is enabled, a device generates its interface identifier using its MAC address and combines it with the network prefix received from a router's advertisement.
The EUI-64 process performs the action required, so disabling it would certainly not achieve the outcome - whereas SLAAC does a similar thing, automatically, so it is the only possible correct answer.
B. Disable the EUI-64 bit process. The EUI-64 process automatically modifies the interface identifier portion of the IPv6 address based on the MAC address. By disabling the EUI-64 process, you can use other methods for generating the interface identifier, such as manual configuration or DHCPv6.
By default, when generating an IPv6 address from a MAC address, the EUI-64 process is used. This process involves taking the 48-bit MAC address and inserting "FFFE" in the middle, resulting in a 64-bit interface identifier. However, this method can potentially compromise privacy, as the MAC address can be easily traced back to the device.
SLAAC is designed to be a simple, automatic approach to assigning IPv6 addresses. It is defined in RFC4862 and is specifically used to assign only a global unicast IPv6 address, an IPv6 prefix length, and, optionally, a default router.
Thanks for the comment. Followed the below Cisco article and other no Ciscos but could not gererate a global address automatically. I will stopped there cause fixation doesnt help.
IPv6 Stateless Autoconfiguration
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3se/5700/ip6-statlss-auto-xe.html
Ref: IPv6 Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)
“C H A P T E R 5
…
SLAAC Address Assignment
The most common method for IPv6 client address assignment is Stateless Address Auto-Configuration (SLAAC). SLAAC provides simple plug-and-play connectivity where clients self-assign an address based on the IPv6 prefix. This process is achieved.
Stateless Address Auto-Configuration (SLAAC) is configured as follows:
…
• Hosts take the first 64 bits of the IPv6 prefix from the Router Advertisement message and combines it with the 64 bit EUI-64 address (in the case of ethernet, this is created from the MAC Address) to create a global unicast message. The host also uses the source IP address, in the IP header, of the Router Advertisement message, as its default gateway.
The last 64 bits of the IP v6 address can be learned based on the following 2 algorithms:
• EUI-64 which is based on the MAC address of the interface, or
• Private addresses that are randomly generated.
…”
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