A new computer that was connected to the network reported an error of an Identical IP address with another computer. Both computers were configured for SLAAC. Which of the following is causing the error?
In the context of SLAAC (Stateless Address Autoconfiguration), if two computers report an identical IP address error, the issue is most likely caused by an incorrect router advertisement. This happens because SLAAC relies on router advertisements to provide the network prefix. If the router sends incorrect or duplicate advertisements, it can lead to IP address conflicts as multiple devices may end up with the same address.
A. Rogue DHCP server: A rogue DHCP server could cause issues with DHCP addresses, but SLAAC is not dependent on DHCP for IP assignment; it uses router advertisements.
B. Duplicate MAC addresses: Duplicate MAC addresses are not related to IP address assignment issues but rather would cause other network problems, such as addressing conflicts at the link layer.
D. Wrong VLAN assignment: Incorrect VLAN assignment might cause connectivity issues or misrouting of traffic but would not directly lead to IP address conflicts in the context of SLAAC.
If I had to make second choice then I'd go with A.
When both computers are configured for SLAAC (Stateless Address Autoconfiguration), the IPv6 addresses are typically generated based on the MAC address of the network interface card (NIC). If two devices on the same network have duplicate MAC addresses, they will generate identical IPv6 addresses using SLAAC, leading to an IP address conflict.
B. Duplicate MAC addresses
"In SLAAC, the IPv6 address is typically generated based on the MAC address of the network interface. If two devices have the same MAC address, they will generate the same IPv6 address, leading to an IP address conflict. Duplicate MAC addresses are rare but can occur due to manufacturing errors or cloning of virtual machines.
An Incorrect router advertisement could cause issues with network configuration but would not result in identical IP addresses being assigned by SLAAC."
With EUI-64 (Extended Unique Identifier-64), the calculation is consistent each time for a given MAC address. Here's a more detailed explanation:
Consistent Algorithm: EUI-64 uses a standardized algorithm to convert a 48-bit MAC address into a 64-bit interface identifier for IPv6 addresses.
Process:
The algorithm takes the 48-bit MAC address.
It inserts 'FFFE' in the middle (after the first 24 bits).
It flips the 7th bit of the first byte (the Universal/Local bit).
Reproducibility: This process will always produce the same 64-bit identifier for a given MAC address.
In an IPv6 network using SLAAC, devices configure their IP addresses based on the prefix advertised by routers through Router Advertisement (RA) messages. If there is an issue with the RA messages, such as an incorrect or duplicate prefix being advertised, it can lead to multiple devices receiving the same IP address.
There is pretty much no way you'd have 2 identical MAC addresses
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