IPv6

Internet Protocol version 6

IPv6 is the latest version of the Internet Protocol. It provides a larger address space, improved security, and better QoS compared to IPv4. It is important for network professionals to understand the differences between the two versions.

5 minutes 5 Questions

Concepts covered: Addressing, Stateless Address Autoconfiguration, IPv6 Quality of Service (QoS), IPv6 Header, IPsec, IPv6 Address Assignment, Transition Mechanisms, Neighbor Discovery Protocol, Multicast, IPv6 Address Types, Routing and Route Aggregation, IPv6 Address Scope, IPv6 Subnetting

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CompTIA Network+ - IPv6 Example Questions

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Question 1

What is the purpose of the Neighbor Discovery Protocol (NDP) in IPv6?

It is used to test network connectivity between nodes on the same network segment. It is used to authenticate nodes on the network and prevent unauthorized access. It is used for nodes to discover other nodes on the same network segment and maintain a list of their addresses. It is used to discover routers on the local network segment and manage routing tables.

Correct Answer: It is used for nodes to discover other nodes on the same network segment and maintain a list of their addresses.

The Neighbor Discovery Protocol (NDP) in IPv6 is primarily used for nodes to discover other nodes on the same network segment, and maintain a list of their addresses. This process enables nodes on the same link to advertise and discover each other's presence, thus forming the basis for communication. This excludes the objectives of discovering routers on the local network segment to manage routing tables, testing network connectivity between nodes, or authenticating nodes to prevent unauthorized access. While NDP may play a role in these functions indirectly, these are not its core purpose in IPv6.

Question 2

What is the size of an IPv6 address expressed in bits?

128 64 256 32

Correct Answer: 128

An IPv6 address is expressed in 128 bits. It’s four times larger than the IPv4’s 32-bit address size, allowing for significantly more possible addresses. In contrast, the 64-bit size is only used to divide the IPv6 address into the network prefix and the interface identifier. The 256 and 32 bit sizes are incorrect as they don't correspond with the size of an IPv6 address.

Question 3

Which of the following is not a valid IPv6 address type?

Anycast Uninet Unicast Multicast

Correct Answer: Uninet

The correct answer is 'Uninet'. This is because 'Uninet' is not a valid IPv6 address type. IPv6 addresses are classified into three types: 'Unicast', 'Multicast', and 'Anycast'. 'Unicast' addresses are used to identify individual interfaces, 'Multicast' addresses are used for one-to-many communication, and 'Anycast' addresses are assigned to a group of interfaces usually belonging to different nodes. There is no 'Uninet' type in IPv6 addressing.

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