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Question 241. What does an IPv6 link-local address provide?

1. Internet-wide routing
2. Communication on the local link
3. DHCPv4 service
4. NAT translation

Correct Answer: 2. Communication on the local link

Explanation:

An IPv6 link-local address is used for communication between devices on the same local network segment. It is especially important for IPv6 functions such as Neighbor Discovery and router-to-host communication. On AOS-CX, enabling IPv6 link-local addressing without manually specifying an address causes the switch to automatically generate one. Link-local addresses are not intended to be routed across the wider network. They normally use the FE80::/10 address range and remain valid only on the local link where they are assigned.

Question 242. What creates an automatic link-local address?

1. ipv6 address link-local
2. ip route
3. show vlan
4. router ospf

Correct Answer: 4. ipv6 address link-local

Explanation:

On AOS-CX, the ipv6 address link-local command enables IPv6 on an interface and can automatically generate a link-local address when no explicit address is supplied. The link-local address supports local IPv6 functions such as Neighbor Discovery. HPE documentation also notes that assigning a global IPv6 address or enabling IPv6 autoconfiguration can automatically create a link-local address. The command is therefore specifically related to IPv6 interface addressing and has no connection to static routing, VLAN display, or OSPF process creation.

Question 243. What does a global unicast IPv6 address provide?

1. Routable IPv6 connectivity
2. Local-link use only
3. MAC learning
4. PoE delivery

Correct Answer: 1. Routable IPv6 connectivity

Explanation:

A global unicast IPv6 address is designed for routable Layer 3 communication beyond the local link. On AOS-CX, administrators can assign a global unicast IPv6 address directly to a routed interface or SVI. When such an address is configured, the switch also automatically creates an IPv6 link-local address on that interface. The global address can then participate in normal IPv6 routing according to the device’s routing table. It is different from a link-local address, which is intended only for communication on the directly connected network segment.

Question 244. What does SLAAC allow?

1. Static routing only
2. Manual addressing only
3. Automatic IPv6 addressing
4. VLAN authentication

Correct Answer: 3. Automatic IPv6 addressing

Explanation:

Stateless Address Autoconfiguration, or SLAAC, allows an IPv6 interface to automatically form an address using information received in Router Advertisement messages. On AOS-CX, the ipv6 address autoconfig command enables this behavior. HPE documents that the interface uses Router Advertisement information and an interface identifier to create the address. This reduces the need for manual IPv6 addressing on every endpoint or interface. SLAAC is separate from stateful DHCPv6, where a DHCPv6 server assigns addresses and maintains more centralized address information.

Question 245. What protocol supports IPv6 neighbor resolution?

1. Neighbor Discovery
2. ARP
3. LACP
4. STP

Correct Answer: 1. Neighbor Discovery

Explanation:

IPv6 uses Neighbor Discovery (ND) instead of IPv4 ARP for functions such as resolving a neighbor’s link-layer address. ND uses ICMPv6 messages and also performs several other important functions, including router discovery, neighbor reachability tracking, Duplicate Address Detection, and Router Advertisement processing. Because ND performs several jobs that were handled by separate IPv4 mechanisms, it is fundamental to normal IPv6 operation. On AOS-CX, administrators can inspect IPv6 neighbor state and ND traffic using dedicated operational commands.

Question 246. What does Duplicate Address Detection verify?

1. Route metric
2. VLAN uniqueness
3. MAC table size
4. IPv6 address uniqueness

Correct Answer: 4. IPv6 address uniqueness

Explanation:

Duplicate Address Detection, or DAD, checks whether a unicast IPv6 address is already in use before the address is considered valid on an interface. This prevents two devices on the same link from using the same IPv6 address. HPE documents that DAD sends Neighbor Solicitation messages as part of the verification process. The default number of DAD attempts is one on the cited AOS-CX platforms, although administrators can change the value where required. DAD therefore protects address uniqueness rather than checking route metrics or VLAN configuration.

Question 247. What does a Router Advertisement provide?

1. MAC authentication
2. IPv6 network information
3. LACP settings
4. Firmware details

Correct Answer: 2. IPv6 network information

Explanation:

IPv6 Router Advertisements provide local hosts with information they can use to configure IPv6 connectivity. This can include network prefixes, default-router information, hop limits, MTU details, and DNS-related information depending on configuration. HPE documentation explains that Router Advertisements can help hosts automatically configure their own IPv6 addresses and other settings. Router Advertisements are part of IPv6 Neighbor Discovery and are sent by IPv6 routers on local network segments. They are not used for MAC authentication, LACP negotiation, or firmware management.

Question 248. What does the RA M flag indicate?

1. No DHCPv6 available
2. DNS only
3. DHCPv6 provides addresses
4. Disable IPv6

Correct Answer: 3. DHCPv6 provides addresses

Explanation:

The Managed Address Configuration flag, commonly called the M flag, appears in IPv6 Router Advertisements. When it is set, hosts are informed that IPv6 addresses are available through DHCPv6. HPE documentation distinguishes the M flag from the O flag, which indicates that other configuration information can be obtained through DHCPv6 even when addresses are not assigned by DHCPv6. These flags help endpoints determine whether they should rely on SLAAC, DHCPv6, or a combination of methods for their IPv6 configuration.

Question 249. What does the RA O flag indicate?

1. Other DHCPv6 information is available
2. OSPF is enabled
3. The interface is offline
4. The prefix is invalid

Correct Answer: 4. Other DHCPv6 information is available

Explanation:

The O flag, or Other Stateful Configuration flag, tells IPv6 hosts that DHCPv6 can provide additional configuration information such as DNS-related parameters. HPE documents that when the M flag is not set but the O flag is set, clients can still use SLAAC for addressing while obtaining other information from DHCPv6. If the M flag is set, DHCPv6 address assignment is already indicated, and the O flag becomes less significant because DHCPv6 can provide the remaining information as part of the same configuration process.

Question 250. What does show ipv6 neighbors display?

1. IPv6 neighbor entries
2. WLAN clients
3. VLAN trunks
4. PoE status

Correct Answer: 1. IPv6 neighbor entries

Explanation:

The show ipv6 neighbors command displays IPv6 Neighbor Discovery entries learned by the switch. The output can include each neighbor’s IPv6 address, associated MAC address, VLAN or interface, physical port, and state such as reachable or stale. This command is useful when troubleshooting IPv6 communication because it confirms whether the switch has resolved neighboring IPv6 devices at Layer 2. HPE allows the command to display entries for the default VRF, a selected VRF, or all VRFs depending on the command options.

Question 251. What does show ipv6 interface verify?

1. AP firmware
2. RADIUS roles
3. IPv6 interface status
4. PoE budget

Correct Answer: 3. IPv6 interface status

Explanation:

The show ipv6 interface command displays IPv6 configuration and operational state for a selected interface. HPE output examples include the interface state, configured IPv6 address, link-local address, IPv6 forwarding status, and locally joined multicast groups. This command is useful when a device cannot communicate over IPv6 because it helps verify whether the interface is up and whether the expected addresses are actually configured and valid. It does not display wireless firmware, RADIUS authorization roles, or PoE capacity.

Question 252. What does an IPv6 static route require?

1. SSID name
2. Destination and next hop
3. PoE priority
4. RADIUS secret

Correct Answer: 2. Destination and next hop

Explanation:

An IPv6 static route defines how the switch should reach a specified IPv6 destination prefix. AOS-CX supports the ipv6 route command with a destination IPv6 prefix and a next-hop IPv6 address, interface, null route, or reject action depending on the requirement. Static routing is useful when network paths are simple and predictable or when an administrator needs a manually defined backup or special-purpose route. Unlike a dynamic routing protocol, a static route does not automatically learn topology changes from neighboring routers.

Question 253. What is the IPv6 default route?

1. ::/0
2. FE80::/10
3. FF00::/8
4. 2001::/16

Correct Answer: 1. ::/0

Explanation:

The IPv6 default route uses the prefix ::/0. It matches any IPv6 destination that does not have a more-specific route in the routing table. Administrators commonly use a default route on branch or edge devices that send most unknown external traffic toward one upstream router. The normal longest-prefix-match rule still applies, so more-specific IPv6 routes take precedence over the default route. AOS-CX supports IPv6 static routes with prefix lengths from 0 through 128, which includes the ::/0 default route.

Question 254. What is FE80::/10 used for?

1. Global Internet routing
2. Multicast only
3. Documentation addresses
4. Link-local addressing

Correct Answer: 4. Link-local addressing

Explanation:

IPv6 addresses beginning in the FE80::/10 range are used for link-local communication. These addresses are automatically or manually configured on IPv6-enabled interfaces and are used for local operations such as Neighbor Discovery. Routers do not forward ordinary link-local packets beyond the local link, which makes these addresses different from global unicast addresses. AOS-CX supports both automatically generated and manually specified link-local addresses through its IPv6 interface configuration. Link-local addressing is essential even when a device also has a globally routable IPv6 address.

Question 255. What does an IPv6 Neighbor Solicitation do?

1. Requests neighbor information
2. Saves configuration
3. Creates a VLAN
4. Sets PoE power

Correct Answer: 2. Requests neighbor information

Explanation:

A Neighbor Solicitation is an ICMPv6 message used by IPv6 Neighbor Discovery. It can be used to determine a neighbor’s link-layer address, verify reachability, and participate in Duplicate Address Detection. HPE’s Neighbor Discovery documentation identifies Neighbor Solicitation and Neighbor Advertisement exchanges as core IPv6 local-link functions. These messages replace several functions that IPv4 handled through ARP. Because they are essential to IPv6 operation, problems with Neighbor Solicitation processing can prevent communication even when interface addressing appears correct.

Question 256. What does an IPv6 Neighbor Advertisement do?

1. Creates OSPF routes
2. Assigns VLANs
3. Responds with neighbor information
4. Updates firmware

Correct Answer: 3. Responds with neighbor information

Explanation:

A Neighbor Advertisement is an ICMPv6 message used within Neighbor Discovery. It commonly responds to a Neighbor Solicitation and provides information that helps another device resolve or confirm the neighbor’s link-layer address and reachability. Neighbor Advertisements are also involved in changes to IPv6 neighbor state. HPE’s ND monitoring commands can display counts for both Neighbor Solicitation and Neighbor Advertisement messages. These messages operate on the local IPv6 link and have nothing to do with OSPF route creation, VLAN assignment, or firmware maintenance.

Question 257. What does RA Guard help block?

1. Rogue Router Advertisements
2. LACP failures
3. NTP messages
4. PoE requests

Correct Answer: 4. Rogue Router Advertisements

Explanation:

RA Guard is an IPv6 access-layer security feature associated with Neighbor Discovery snooping on supported AOS-CX platforms. It helps prevent unauthorized devices on untrusted ports from sending Router Advertisements or Router Redirect messages that could manipulate host IPv6 configuration. HPE documentation states that RA and redirect packets received on untrusted ports of an RA Guard-enabled VLAN can be dropped. This protects hosts from selecting an unauthorized gateway or accepting malicious IPv6 network information. Trusted infrastructure-facing ports can still permit legitimate RA traffic.

Question 258. What does SLAAC rely on?

1. Static routes
2. Router Advertisements
3. TACACS+
4. Syslog

Correct Answer: 2. Router Advertisements

Explanation:

SLAAC relies on information received through IPv6 Router Advertisements to automatically configure an interface address. On AOS-CX, enabling ipv6 address autoconfig allows the interface to use RA information and an interface identifier to construct an IPv6 address. Router Advertisements can also communicate information such as prefixes, default-router information, and other network parameters. SLAAC therefore provides automatic IPv6 configuration without requiring a stateful DHCPv6 address assignment process. It has no dependency on TACACS+ or syslog.

Question 259. What does IPv6 ND replace for address resolution?

1. IPv4 ARP
2. DNS
3. NTP
4. RADIUS

Correct Answer: 1. IPv4 ARP

Explanation:

IPv6 Neighbor Discovery replaces the IPv4 ARP mechanism for resolving Layer 3 addresses to Layer 2 addresses. It uses ICMPv6 Neighbor Solicitation and Neighbor Advertisement messages rather than ARP Request and ARP Reply frames. Neighbor Discovery also performs several additional functions, including router discovery, Neighbor Unreachability Detection, Router Advertisement processing, and Duplicate Address Detection. Because of its broader role, ND is one of the most important foundational IPv6 protocols to understand when troubleshooting AOS-CX IPv6 connectivity.

Question 260. Which design BEST supports basic IPv6 access?

1. Disable ND and RA
2. Use IPv4 ARP only
3. Use IPv6 addressing, RA/SLAAC, ND, and IPv6 routing
4. Use only VLAN names

Correct Answer: 3. Use IPv6 addressing, RA/SLAAC, ND, and IPv6 routing

Explanation:

A functional IPv6 access network requires several complementary pieces. Interfaces need IPv6 addresses, either configured manually or learned through SLAAC. Router Advertisements provide hosts with prefixes and other local network information. Neighbor Discovery resolves local neighbors and supports reachability, router discovery, and Duplicate Address Detection. Finally, IPv6 routes provide connectivity beyond the local segment. Disabling ND or relying on IPv4 ARP would break fundamental IPv6 functions. HPE AOS-CX supports these IPv6 services directly through interface, Neighbor Discovery, Router Advertisement, and static or dynamic routing features.