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Question 110
An ICMPv6 echo is sent to fe80::1234, but two separate local interfaces each contain that link-local destination on different links. How must the sender scope its request to the intended neighbor?
- Use fe80::1234 as a globally routable address without an egress interface
- Specify the outgoing interface or zone with the link-local destination
- Replace fe80::1234 with ff02::1 and send a multicast ping
- Create a static default route ::/0 toward one unknown link
Explanation
Correct Answer
B:Link-local addresses are scoped per interface and need the correct interface context.
Incorrect Answers
A:Link-local destinations are scoped to one link and cannot select among identical addresses on separate links without interface context.
C:All-nodes multicast would reach multiple hosts and is not the intended one specific neighbor.
D:A default route is not a substitute for specifying the link-local address’s local egress zone/interface.
Question 111
A company has been delegated a production IPv6 prefix within 2000::/3 by its ISP. Which address category may be routed globally when permitted by upstream policy, rather than being only link-local, multicast, or documentation-only?
- A provider-assigned global-unicast address from the allocated production prefix
- An address from 2001:db8::/32 reserved for documentation examples
- An fe80::/10 link-local address on the LAN
- An ff02::1 link-local multicast group address
Explanation
Correct Answer
A:A production global-unicast address assigned from a provider’s legitimate allocation can be routed between networks subject to network policy.
Incorrect Answers
B:Although 2001:db8 has global-unicast-like formatting, the documentation reservation is not for real globally routable service addresses.
C:Link-local addresses must remain on their local link and are not forwarded as globally reachable destinations.
D:The ff02::1 group is multicast to local-link nodes, not a globally routed unicast interface address.
Question 112
A lab's internal IPv6 service address is fd12:3456:789a::20 and must remain in locally assigned unique-local space. Which address type/prefix classification is correct?
- An IPv6 global-unicast address from an ISP-delegated production 2000::/3 prefix
- An IPv6 link-local unicast address in fe80::/10
- An IPv6 multicast group address starting with ff00::/8
- An fd12:3456:789a::20 ULA address
Explanation
Correct Answer
D:Unique-local IPv6 addresses are within fc00::/7; locally assigned prefixes normally start with fd. They serve internal addressing and are not intended for general Internet routing in the way publicly allocated global prefixes are.
Incorrect Answers
A:A locally assigned fd-prefix ULA is not an Internet-routable production global allocation.
B:The fd12 prefix is unique-local, not link-local fe80, and can be used across routed internal links under policy.
C:The address begins fd and identifies one internal unicast interface, not a multicast group.
Question 113
A router reports `fe80::50` on an Ethernet interface. A host on another subnet cannot route directly to this address, and a link-local next hop must be interpreted with its outgoing interface. Which IPv6 address type does this represent?
- An IPv6 ULA address in fc00::/7
- A fe80::50 link-local address
- The IPv6 loopback address ::1
- An IPv6 multicast address in ff00::/8
Explanation
Correct Answer
B:Addresses of form fe80::/10 are link-local unicast and are limited in scope to the attached link; routers do not forward them as globally routable destinations.
Incorrect Answers
A:ULA addresses use the unique-local range and are conceptually separate from the fe80:: link-local scope.
C:IPv6 loopback is a single local-host address and does not have the fe80:: prefix used for on-link interfaces.
D:Multicast group destinations use the ff00::/8 range; fe80::50 is a link-local unicast address.
Question 114
A host sends a packet to ff02::1 to reach all IPv6 nodes on its immediate link, with no attempt to forward beyond the local scope. What address role does ff02::1 have?
- A global unicast IPv6 address identifying one Internet-facing server
- An ff02::1 all-nodes multicast address
- A link-local unicast fe80::/10 used as a router next-hop
- The ff02::2 all-routers multicast group
Explanation
Correct Answer
B:ff02::1 is the link-local all-nodes multicast group, so one packet can target listening IPv6 nodes on the link. Multicast addresses start with ff; they do not identify a single unicast host.
Incorrect Answers
A:The ff02 prefix is multicast with link scope, not a provider-routed single-host address.
C:Both can be link-scoped, but fe80 identifies a single interface whereas ff02::1 is all-nodes multicast.
D:That related multicast address targets routers only, unlike ff02::1 which includes all IPv6 nodes on the link.
Question 115
A diagnostic command contacts ::1 on the same device, without traversing a physical link. Which IPv6 special address describes the local protocol-stack loopback?
- The ::/128 unspecified address used when a device has no selected IPv6 source
- An IPv6 fe80::/10 link-local interface address
- A unique-local fd00::/8 address used on routed internal networks
- The ::1 IPv6 loopback address
Explanation
Correct Answer
D:IPv6 ::1/128 identifies the local host and is never a routed remote interface.
Incorrect Answers
A:The all-zero :: address is unspecified; ::1/128 is the local loopback endpoint.
B:Link-local communicates across an attached link, while ::1 never exits the originating host stack.
C:ULA supports internal network addressing and is distinct from ::1 loopback.
Question 116
A monitoring application needs to send one telemetry message to all IPv6 hosts that joined a designated application multicast group. It must not target only the routers on the link. Which mechanism performs that delivery?
- IPv6 multicast traffic addressed to the application group
- IPv6 unicast to one host’s address
- The IPv6 unspecified address :: as destination
- The reserved ff02::2 all-routers multicast group regardless of application membership
Explanation
Correct Answer
A:Multicast forwarding can deliver group-destination traffic to the interfaces that subscribed to that application group, with scope and multicast-routing controls as applicable.
Incorrect Answers
B:Unicast identifies one interface; it cannot by itself target all dynamically subscribed members with one group packet.
C:The unspecified :: address is not a usable packet destination and has no subscription semantics.
D:ff02::2 specifically addresses routers on one local link, not an arbitrary set of application-host subscribers.
Question 117
Multiple routers advertise one identical IPv6 service address and ordinary routing directs a client to one reachable member. Which IPv6 delivery paradigm is this?
- IPv6 multicast, delivering one datagram to every joined group member
- IPv6 unicast with a unique address assigned to only one router globally
- IPv6 anycast addressing and routing
- The ff02::2 all-routers group that transmits to every local router
Explanation
Correct Answer
C:Anycast uses a shared unicast address on several nodes and routing selects a reachable instance.
Incorrect Answers
A:Anycast shares one unicast-format address among instances, but forwarding chooses one reachable instance.
B:Unicast to one uniquely addressed router differs from multiple devices intentionally sharing the same destination address.
D:The service uses a shared routed unicast-looking destination rather than the link-local multicast group.
Question 118
A packet has one IPv6 destination address assigned to a specific interface and must be delivered to that single intended host. Which IPv6 addressing model is in use?
- Anycast with the same service address assigned to several routers
- IPv6 unicast addressing
- Multicast to an application group with many subscribed recipients
- Broadcast IPv6 packet delivery to every neighbor on the link
Explanation
Correct Answer
B:A unicast destination identifies a single addressed interface.
Incorrect Answers
A:Anycast may look like unicast but has multiple interfaces representing one service address; this scenario uniquely addresses one host.
C:A group address can reach multiple members and is not the specified single interface destination.
D:IPv6 has multicast groups but not a normal IPv4-style all-ones broadcast address for this unicast flow.
Question 119
Before an interface obtains a usable IPv6 address, it uses the all-zero IPv6 address as a source in a limited initialization exchange. What is that special address called?
- The ::1/128 loopback address representing the same device
- An ff02::1 link-local all-nodes multicast destination
- A fe80::/10 link-local unicast address derived for an interface
- The :: unspecified IPv6 address
Explanation
Correct Answer
D:The all-zero ::/128 address can represent an unspecified source and is not a usable destination.
Incorrect Answers
A:Loopback is a valid local host destination, while ::/128 is unspecified and can appear as a source during initialization.
B:This is a multicast destination for on-link receivers, not the all-zero unspecified source.
C:A link-local address is an assigned unicast address and is not the all-zero unspecified source used before addressing.
Question 120
A new IPv6 host has a link-local address but has not yet learned its default router. It sends an ICMPv6 Router Solicitation to all routers on the local link. Which multicast destination must this solicitation use?
- ff02::1, the link-local all-nodes group used for unsolicited router advertisements
- ff02::1:ff00:1, a solicited-node group for neighbor discovery of a specific target
- ff02::2, the link-local all-routers multicast group
- ff05::2, the site-scoped all-routers group rather than the local-link discovery destination
Explanation
Correct Answer
C:ICMPv6 Router Solicitations are sent by hosts to ff02::2 so local routers can answer with Router Advertisements providing prefix and default-router information.
Incorrect Answers
A:ff02::1 reaches all nodes on the link and is a common destination for periodic Router Advertisements, not the all-routers Router Solicitation destination required here.
B:Solicited-node multicast resolves a particular IPv6 neighbor; a router solicitation seeks available routers rather than one neighbor's link-layer address.
D:ff05::2 uses a larger site scope and is not the standard link-local router-solicitation multicast target.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests