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This page has 13 IPv6 Configuration Scenarios scenario questions for the 100-150 exam, each with detailed explanations and wrong-answer analysis.

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Read the full scenario before looking at the answer options. Identify the constraint or requirement in the scenario, then eliminate options that are generally true but wrong for this specific case. Scenario questions reward careful reading over pattern matching.

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IPv6 Configuration Scenarios

Practise Cisco Certified Support Technician - Networking practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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Scenario guide

How to approach ipv6 configuration scenarios

IPv6 questions test address types (global unicast, link-local, multicast, anycast), address assignment (SLAAC, DHCPv6, EUI-64), OSPFv3, and dual-stack. The CCNA often presents an IPv6 address and asks you to identify the prefix, type, or calculate the EUI-64 interface ID.

Quick answer

IPv6 questions usually test address types (link-local, global unicast, ULA), autoconfiguration (SLAAC), Neighbor Discovery Protocol and the differences from IPv4.

IPv6 address types and their scopes (link-local, global unicast, multicast, ULA).

SLAAC vs DHCPv6 vs stateful assignment.

Neighbor Discovery Protocol replacing ARP.

IPv6 routing differences and dual-stack coexistence.

Practice scenarios

Question 1hardmultiple choice

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Refer to the exhibit. Based on the IPv6 configuration of the GigabitEthernet0/0 interface, which statement is true regarding the connectivity of this router?

Exhibit

GigabitEthernet0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::201:42FF:FE28:5A01
  No global unicast address is configured
  Joined group address(es): FF02::1, FF02::1:FF28:5A01

A
The router can communicate with any host on the internet.
Why it fails: Internet communication requires a globally routable address, known as a Global Unicast Address. Since the exhibit explicitly states that no global unicast address is configured, the router is restricted to the local segment and cannot send or receive traffic from the public internet or other remote networks.
B
The router can only communicate with other hosts on the local link.
Link-local addresses starting with FE80 are automatically generated or manually assigned to facilitate communication within a single local segment. Because no global unicast address is present, the router cannot forward packets from this interface to remote networks or receive traffic originating from outside the local broadcast domain.
C
The interface is disabled because it lacks a global address.
Why it fails: The exhibit clearly shows that the interface is 'up' and 'line protocol is up', which means it is fully operational at Layers 1 and 2. IPv6 is also enabled, so the interface can function perfectly well for local management and protocol exchanges despite lacking a globally routable IP address.
D
The router will use the FF02::1 address to route external traffic.
Why it fails: The FF02::1 address is an all-nodes multicast address used for local communication within the segment. It is not a routable address and cannot be used as a source or destination for traffic intended for external networks. Multicast addresses serve to reach groups of hosts rather than providing routing paths.

Full breakdown with real-world context →

Question 2mediummultiple choice

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Which of the following is the correct representation of the IPv6 address 2001:0DB8:0000:0000:0008:0800:200C:417A in compressed format?

A
2001:DB8::8:800:200C:417A
This is the correct compressed form. The leading zeros in 0DB8 were removed, and the two blocks of zeros were successfully represented by the double-colon. Additionally, the leading zeros in 0800 were removed, resulting in 800, which is the correct and most efficient way to express this IPv6 address.
B
2001:DB8:0:0:8:800:200C:417A
Why it fails: While this representation is technically valid, it is not the most compressed form possible. IPv6 standards encourage using the double-colon to represent zeros whenever possible. Leaving the zeros as :0:0 instead of using :: is considered poor practice and does not adhere to the standard concise format.
C
2001:DB8::0000::8:800:200C:417A
Why it fails: Using the double-colon (::) twice in a single address is strictly forbidden by the IPv6 specification. It creates ambiguity, making it impossible for the device to determine how many bits were represented by each shorthand. Such a format would be rejected as a syntax error by Cisco IOS software.
D
2001:DB8:0000:0000:8:800:200C:417A
Why it fails: This option fails to use the double-colon compression entirely, leaving the address unnecessarily long. While technically functional, it does not demonstrate an understanding of the standard IPv6 compression rules designed to simplify address management. Efficient notation is highly preferred in technical environments to prevent manual entry errors in device configurations.

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Question 3hardmulti select

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A network administrator is documenting the IPv6 addressing scheme for a new campus. The administrator must identify which statements about IPv6 address structure and notation are accurate. (Choose two.)

A
An IPv6 address can contain multiple double colon sequences as long as each replaces a different zero run.
Why it fails: The double colon may appear at most once in any IPv6 address. Allowing multiple instances would make the address ambiguous because the parser could not determine how many zero groups each double colon represents. This restriction is enforced by RFC 4291 and is essential for consistent address interpretation across implementations.
B
The IPv6 prefix length is expressed in dotted-decimal notation following a space, such as 2001:db8::1 255.255.255.0.
Why it fails: IPv6 prefixes are always written with a slash and a decimal number of bits, for example 2001:db8::/32. Dotted-decimal subnet masks belong to IPv4 and have no role in IPv6 notation. Mixing the two formats is a conceptual error that would confuse configuration and documentation.
C
Leading zeros within each 16-bit group of an IPv6 address can be omitted to shorten the notation.
Each hextet can drop leading zeros, so 0db8 becomes db8 and 0001 becomes 1. This reduces visual clutter without changing the address value. Trailing zeros within a group, however, cannot be dropped, because doing so would alter the numeric value of that hextet and produce a different address.
D
Trailing zeros at the end of a hextet may be removed to shorten the address, so 2001:0db0::1 can be written as 2001:0db::1.
Why it fails: Only leading zeros within a hextet may be suppressed. Removing trailing zeros changes the value of the group, since 0db0 equals 3504 while 0db equals 219. Such a modification produces a completely different address and is never permitted under IPv6 text representation rules.
E
A single contiguous sequence of zero groups within an IPv6 address may be compressed once using a double colon.
IPv6 notation allows the double colon to replace one contiguous run of zero groups, and this can appear only once in an address. If multiple zero runs existed and both were compressed, the address would be ambiguous. This rule preserves unambiguous parsing of the address and is a fundamental part of RFC 4291 representation.

Full breakdown with real-world context →

Question 4easymultiple choice

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Which IPv6 address type is represented by the prefix fe80::/10?

A
Global Unicast
Why it fails: Global Unicast addresses are equivalent to public IPv4 addresses and are globally routable. They typically start with a 2000::/3 prefix. Link-local addresses are strictly confined to the local broadcast domain and cannot be used for end-to-end communication across different networks or the internet.
B
Unique Local
Why it fails: Unique Local addresses, defined in RFC 4193, use the fc00::/7 prefix and are intended for private, non-routable communication within an organization. They are functionally similar to IPv4 private addresses like 192.168.0.0/16 but differ significantly from the fe80::/10 range used for link-local operations.
C
Link-Local
Link-Local addresses are automatically assigned to interfaces for link-specific communication. The range fe80::/10 is specifically reserved for this purpose, ensuring that devices can communicate with neighbors even without a DHCPv6 server or manual configuration, which is a mandatory requirement for IPv6 operational stability.
D
Multicast
Why it fails: Multicast addresses begin with the ff00::/8 prefix. These addresses are used to identify a group of interfaces rather than a single specific node. Confusing link-local with multicast addresses is a common error, but they serve distinct architectural roles within the IPv6 networking protocol stack.

Full breakdown with real-world context →

Question 5mediummulti select

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Which TWO of the following statements regarding IPv6 address representation are accurate?

A
The double-colon (::) can be used multiple times in a single IPv6 address to shorten it.
Why it fails: Using a double-colon more than once in an IPv6 address creates ambiguity regarding how many zero bits are being suppressed. The rule strictly dictates that the shorthand may be used exactly once per address to ensure that the total bit count remains fixed at 128 bits.
B
Leading zeros in a 16-bit field can be omitted.
The IPv6 specification allows for the omission of leading zeros within each hexadecimal quartette. For example, 0db8 becomes db8. This convention significantly reduces the length of written addresses, making them easier for network administrators to manage, read, and type into device configuration files without introducing errors.
C
An IPv6 address must always be written in full 32-character hexadecimal format.
Why it fails: Requiring a full 32-character representation ignores the standard compression rules designed for human readability. Cisco IOS accepts compressed formats, and forcing a full representation is unnecessary and prone to manual input errors during device configuration, which could result in connectivity issues across the network infrastructure.
D
The double-colon (::) represents one or more groups of 16-bit fields containing all zeros.
The double-colon is the designated shorthand for a contiguous string of zero-valued fields. This notation is essential for shortening long strings of zeros, such as in link-local or unique local addresses. It streamlines the input process and is the standard way to reference unspecified addresses in configurations.
E
Trailing zeros in a 16-bit field can be omitted.
Why it fails: Only leading zeros in a 16-bit field can be omitted. Trailing zeros are significant because they represent the numerical value of the field. Omitting them would change the value of the address, resulting in an incorrect logical identifier that prevents communication between the intended network devices.

Full breakdown with real-world context →

Question 6mediummultiple choice

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A network engineer is migrating a network to IPv6 to solve address exhaustion. Which feature of IPv6 eliminates the need for broadcasting to discover MAC addresses on a local link?

A
NDP
Neighbor Discovery Protocol uses ICMPv6 and multicast to perform address resolution and find routers on the local link. By using multicast instead of broadcast, only the nodes interested in the specific discovery message process it, which significantly reduces unnecessary traffic and improves performance across the entire local network.
B
NAT
Why it fails: Network Address Translation was a workaround used in IPv4 to conserve public addresses by mapping multiple private IPs to a single public IP. Because IPv6 has a massive address space, it was designed to provide every device with a globally unique address, making NAT largely unnecessary for address conservation.
C
ARP
Why it fails: This is the specific protocol used in IPv4 that relies on broadcasts to resolve hardware addresses. IPv6 completely removes ARP in favor of a different protocol. Continuing to use ARP concepts in an IPv6 environment is a common misconception, as the underlying discovery mechanisms have been fundamentally redesigned.
D
DHCPv6
Why it fails: While this protocol can be used to assign IPv6 addresses and other configuration details to hosts, it is not responsible for resolving MAC addresses. It operates at the Application Layer and serves a similar role to its IPv4 counterpart, whereas address resolution is a lower-level function handled by NDP.

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Question 7mediummultiple choice

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A network engineer is configuring IPv6 on a Cisco router interface. The engineer wants to ensure that the interface can automatically generate a link-local address and participate in neighbor discovery without manual configuration. Which IPv6 address type is automatically generated on the interface when IPv6 is enabled?

A
Unique local address
Why it fails: Unique local addresses, in FC00::/7 and in practice FD00::/8, are private IPv6 addresses for use inside an organisation, similar in purpose to RFC 1918 IPv4 ranges. They are not created automatically when IPv6 is enabled; they must be configured manually, through SLAAC from an advertised ULA prefix, or by DHCPv6. Only the link-local address is always generated automatically.
B
Link-local address
Enabling IPv6 on an interface, with 'ipv6 enable' or by configuring any IPv6 address, automatically creates a link-local address in FE80::/10, on Cisco routers usually from the MAC address using modified EUI-64. Link-local addresses are used for neighbour discovery, router advertisements and routing protocol neighbours, and are never routed. Many engineers set them manually, such as FE80::1, to make gateways easier to read.
C
Multicast address
Why it fails: Interfaces do not get a multicast address as their own address; instead, they join multicast groups. An IPv6 interface automatically joins FF02::1 (all nodes) and, on routers, FF02::2 (all routers), plus a solicited-node group for each unicast address, used by neighbour discovery. These memberships appear in 'show ipv6 interface', but the automatically generated address is the link-local one.
D
Global unicast address
Why it fails: Global unicast addresses are routable on the public internet and are typically assigned manually or via DHCPv6 or SLAAC. They are not automatically generated solely by enabling IPv6 on an interface. While SLAAC can create a global address if a router advertisement is received, the link-local address is the one that is always auto-generated.

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Question 8mediummulti select

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Which TWO statements correctly describe valid rules for compressing or representing IPv6 addresses?

A
Leading zeros in a quartet can be omitted.
Removing leading zeros is a standard compression method that simplifies the appearance of an address without changing its value. For example, the quartet '0db8' can be written as 'db8'. This reduces the character count and makes the address easier for network technicians to read and document.
B
Consecutive fields of zeros can be replaced by '::' only once.
The double colon represents one or more groups of sixteen bits that are all zeros. It can only appear once in any IPv6 address to prevent ambiguity. If it appeared multiple times, it would be impossible to determine exactly how many zeros belong in each compressed section.
C
Trailing zeros in a quartet can be omitted to save space.
Why it fails: Omitting trailing zeros is not allowed because it would fundamentally change the value of the hexadecimal quartet. For instance, '1200' would become '12', which represents a completely different numerical value in the 128-bit address structure, leading to incorrect routing and address identification errors on the network.
D
A single quartet of '0000' must always be compressed to '::'.
Why it fails: A single quartet of zeros can be compressed to a single '0' if the double colon is already being used elsewhere in the address. There is no requirement that every zero quartet must use the double colon; in fact, the double colon is limited to one occurrence per address.
E
IPv6 addresses use dots to separate quartets for better readability.
Why it fails: IPv6 addresses use colons as delimiters between the eight 16-bit quartets, unlike IPv4 which uses dots to separate its four 8-bit octets. Using dots in an IPv6 address would be a syntax error and would not be recognized by any standard Cisco IOS or other networking operating system.

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Question 9hardmultiple choice

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A network engineer is configuring IPv6 on a Cisco router interface. The engineer assigns the address 2001:db8:acad:1::1/64 to GigabitEthernet0/0. Which of the following statements is true regarding the interface's IPv6 configuration?

A
The interface will use the global unicast address as its link-local address.
Why it fails: Global unicast and link-local addresses serve different purposes and have different prefixes. A global unicast address (2001:db8::/32 range) cannot be used as a link-local address (fe80::/10). The interface will have both types of addresses, not a single combined one.
B
The interface will automatically generate a link-local address using the EUI-64 format.
When an IPv6 address is configured on a Cisco router interface, the interface automatically generates a link-local address (starting with fe80::) using the EUI-64 format by default, unless a link-local address is manually configured. This link-local address is used for neighbor discovery and routing protocols.
C
The interface will require manual configuration of a link-local address to enable IPv6.
Why it fails: Manual configuration of a link-local address is optional. By default, the router automatically generates one. Manual configuration is only needed if a specific link-local address is desired, but it is not required for IPv6 to function on the interface.
D
The interface will not have a link-local address because only global unicast addresses are configured.
Why it fails: Every IPv6-enabled interface must have a link-local address. Configuring a global unicast address does not prevent the automatic generation of a link-local address. The link-local address is essential for communication on the local link, so this statement is false.

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Question 10hardmulti select

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Which TWO of the following statements are true regarding IPv4 and IPv6 coexistence?

A
Dual-stack enables a device to run IPv4 and IPv6 protocol stacks simultaneously.
Dual-stack is the most common transition mechanism, allowing interfaces to support both protocol versions at the same time. This ensures compatibility with legacy IPv4-only hosts while enabling native IPv6 traffic for modern devices, providing a seamless operational transition within the enterprise network architecture without requiring an immediate, complete overhaul.
B
IPv6 addresses are directly compatible with IPv4 routing tables.
Why it fails: IPv4 and IPv6 are fundamentally different at the protocol header level and address length. IPv4 addresses are 32 bits, while IPv6 addresses are 128 bits. A standard IPv4 routing table cannot store or process IPv6 addresses without specific protocol-specific configurations or dual-stack support, making them incompatible at the direct routing level.
C
Tunneling encapsulates IPv6 packets inside IPv4 headers.
Tunneling is a strategy where IPv6 packets are wrapped inside IPv4 packets to traverse existing IPv4-only network infrastructure. This allows IPv6 communication between isolated islands of IPv6-capable devices, which is essential for scaling IPv6 implementation without having to upgrade every intermediary hop in the network path immediately.
D
IPv4 is natively supported by all IPv6-only devices.
Why it fails: IPv6-only devices do not inherently support IPv4, as the stacks are separate. To communicate with IPv4 hosts, an IPv6-only device must utilize specific translation mechanisms like NAT64. Assuming native support leads to connectivity issues and requires a misunderstanding of how protocol stacks function on modern network operating systems.
E
Broadcast traffic is still required for IPv6 address resolution.
Why it fails: IPv6 replaces broadcast traffic with efficient multicast messages for neighbor discovery. This improvement reduces the overhead on network segments, as devices no longer need to process broadcast packets, which is a key design advantage of the newer IPv6 protocol architecture over traditional IPv4 broadcast-heavy operations.

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Question 11hardmultiple choice

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A network administrator is planning to deploy IPv6 on a Cisco router. The administrator needs to assign a global unicast address to the GigabitEthernet0/0 interface. Which of the following addresses is a valid global unicast IPv6 address that can be manually configured on the interface?

A
FE80::1
Why it fails: FE80::1 is a link-local address, automatically generated on every IPv6-enabled interface and used for neighbor discovery and communication within the local link. It cannot be manually configured as a global unicast address. While it can be manually assigned, it remains link-local and is not routable beyond the local segment, so it does not meet the requirement for a global unicast address.
B
FF02::1
Why it fails: FF02::1 is the all-nodes multicast address for the link-local scope. It is used to send packets to all IPv6 nodes on the local link and cannot be assigned to an interface as a unicast address. Multicast addresses are not used as source or destination for unicast communication and are not manually configured on interfaces for general connectivity.
C
2001:DB8:ACAD:1::1
2001:DB8::/32 is the documentation prefix reserved for examples, but within a private lab or documentation context, it is a valid global unicast address. In a real deployment, a global unicast address from the provider's allocated range would be used. This address is in the 2000::/3 range, which is designated for global unicast, and can be manually configured on the interface.
D
::1
Why it fails: ::1 is the loopback address for IPv6, equivalent to 127.0.0.1 in IPv4. It is used for internal testing and cannot be assigned to a physical interface for network communication. It is automatically configured on the loopback interface and is not a global unicast address, so it cannot be used for external connectivity.

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Question 12hardmulti select

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A network administrator is implementing IPv6 in a corporate environment. Which TWO address types are commonly used to facilitate local link communication and global internet access respectively?

A
Link-Local Address (FE80::/10)
Link-local addresses are automatically generated by every IPv6-enabled interface. They are used for communication between devices on the same local link and for neighbor discovery protocols. These addresses are not routable beyond the local segment, making them perfect for internal overhead tasks and initial configuration before a global address is assigned.
B
Unique Local Address (FC00::/7)
Why it fails: Unique Local Addresses (ULAs) are intended for use within a specific site or organization and are not routable on the global internet. While they are similar to private IPv4 addresses, they do not fulfill the requirement for global internet access. They are useful for internal traffic that should never be exposed to the public web.
C
Global Unicast Address (2000::/3)
Global Unicast Addresses (GUAs) are globally unique and routable on the public internet. They allow devices to communicate directly with any other IPv6-enabled device worldwide without the need for Network Address Translation (NAT). These addresses are typically assigned by an ISP and are the primary way enterprise networks provide external connectivity.
D
Multicast Address (FF00::/8)
Why it fails: Multicast addresses are used to send a single packet to multiple destinations simultaneously. While they are crucial for functions like Neighbor Discovery (which replaces ARP in IPv6), they do not represent an individual device's identity for general link communication or global internet access. They serve as group identifiers rather than specific source or destination host addresses.
E
Loopback Address (::1/128)
Why it fails: The loopback address in IPv6 is used by a host to send traffic to itself, primarily for testing the internal protocol stack. It is not used for communication with other devices on the local link or for accessing resources on the internet. It is functionally equivalent to the 127.0.0.1 address used in IPv4 networking.

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Question 13mediummultiple choice

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In an IPv6 environment, which address type is automatically configured on every IPv6-enabled interface and is used for neighbor discovery and router solicitation?

A
Unique Local Address
Why it fails: Unique Local Addresses (ULAs) are the IPv6 equivalent of private IPv4 addresses and start with the prefix FC00::/7. While they are used for internal communication, they are not automatically required for every interface to function at a basic level, nor are they used for the low-level neighbor discovery process.
B
Global Unicast Address
Why it fails: Global Unicast Addresses are used for communication across the internet and are equivalent to public IPv4 addresses. They are not always automatically configured; they often require a DHCPv6 server or Router Advertisements to be present, and they are not the primary address used for local link layer discovery.
C
Link-Local Address
Link-local addresses are automatically created as soon as IPv6 is enabled on an interface. They use the FE80::/10 prefix and provide the necessary connectivity for nodes to discover each other on the local wire, even before any global or local routing has been established by an administrator.
D
Anycast Address
Why it fails: Anycast is a communication method where a single address is assigned to multiple devices, and traffic is routed to the nearest one. It is a specialized addressing type used for load balancing and redundancy, not for the automatic neighbor discovery and basic link-level initialization required by all IPv6 devices.

Full breakdown with real-world context →

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IPv6 Configuration Scenarios

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Practice scenarios

Refer to the exhibit. Based on the IPv6 configuration of the GigabitEthernet0/0 interface, which statement is true regarding the connectivity of this router?

Exhibit

Which of the following is the correct representation of the IPv6 address 2001:0DB8:0000:0000:0008:0800:200C:417A in compressed format?

A network administrator is documenting the IPv6 addressing scheme for a new campus. The administrator must identify which statements about IPv6 address structure and notation are accurate. (Choose two.)

Which IPv6 address type is represented by the prefix fe80::/10?

Which TWO of the following statements regarding IPv6 address representation are accurate?

A network engineer is migrating a network to IPv6 to solve address exhaustion. Which feature of IPv6 eliminates the need for broadcasting to discover MAC addresses on a local link?

Which TWO statements correctly describe valid rules for compressing or representing IPv6 addresses?

A network engineer is configuring IPv6 on a Cisco router interface. The engineer assigns the address 2001:db8:acad:1::1/64 to GigabitEthernet0/0. Which of the following statements is true regarding the interface's IPv6 configuration?

Which TWO of the following statements are true regarding IPv4 and IPv6 coexistence?

A network administrator is planning to deploy IPv6 on a Cisco router. The administrator needs to assign a global unicast address to the GigabitEthernet0/0 interface. Which of the following addresses is a valid global unicast IPv6 address that can be manually configured on the interface?

A network administrator is implementing IPv6 in a corporate environment. Which TWO address types are commonly used to facilitate local link communication and global internet access respectively?

In an IPv6 environment, which address type is automatically configured on every IPv6-enabled interface and is used for neighbor discovery and router solicitation?