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IPv6 Addressing

5 minutes 5 Questions

IPv6 is the successor of IPv4, developed to address the limitations and exhaustion of available IPv4 addresses. IPv6 uses a 128-bit address space, providing a colossal number of unique IP addresses. This allows for multiple subnets and hierarchal address allocation techniques which provide improved…

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CompTIA Network+ - IPv6 Addressing Example Questions

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Question 1

In an IPv6 network, a technician needs to auto-configure the address for a host using stateless address autoconfiguration (SLAAC). Which protocol helps to obtain the prefix information required for this purpose?

Correct Answer: Router Advertisement (RA)

In an IPv6 network, for stateless address autoconfiguration (SLAAC), the host uses the Router Advertisement (RA) protocol to obtain the prefix information required for this purpose. Router Advertisement broadcasts are sent by IPv6 routers to provide the necessary network-specific information such as the network prefix. On the other hand, Router Solicitation (RS) is a type of Internet Control Message Protocol version 6 (ICMPv6) message whereby a host requests for a Router Advertisement from the router to acquire configuration details of the network. Neighbor Solicitation (NS) and Neighbor Advertisement (NA) are part of the Neighbor Discovery Protocol responsible for network functions such as router and prefix discovery, address resolution, and duplicate address detection but they do not help in obtaining the prefix information for SLAAC.

Question 2

A technician needs to enable an IPv6 to IPv4 tunneling on their network's border router. Which tunneling mechanism would be suitable for this purpose?

Correct Answer: 6to4

The '6to4' tunneling mechanism is the best method for enabling an IPv6 to IPv4 tunneling over a network's border router. It's designed specifically for this task and provides automatic and direct communication between two IPv6 entities over an IPv4 network without needing a central tunnel broker. 'ISATAP', '6RD', and 'Teredo' are also tunneling techniques but they are not optimal. 'ISATAP' is meant to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network, which is not the challenge at hand. '6RD' is essentially a provider-based version of 6to4, where the ISP takes greater responsibility for providing IPv6 connectivity, which might not be what is needed in this case. Lastly, 'Teredo' is designed to grant IPv6 connectivity to nodes that are behind IPv6-unaware NAT devices, which also isn't the concern here. Therefore, '6to4' is the most suitable answer.

Question 3

A network administrator is troubleshooting an issue with an IPv6 address, where they suspect it belongs to a multicast group. What value should the IPv6 address have in its first octet to confirm that it belongs to a multicast group?

Correct Answer: ff

An IPv6 address that belongs to a multicast group will always begin with 'ff' in its first octet. This is because the 'ff' identifies the address as a multicast address according to the numbering scheme of IPv6. The other options 'fe', 'fd', and 'fc' are incorrect as they do not denote multicast addresses in the IPv6 addressing scheme.

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