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Question 100
A router must display *installed IPv6 destination prefixes* and their next hops, rather than its neighbor cache or interface address summary. Which operational command meets that request?
- Run show ipv6 interface brief and infer installed remote prefixes from assigned addresses
- Run show ipv6 neighbors to retrieve remote route metrics
- Run show ipv6 protocols to display all next-hop route entries
- show ipv6 route
Explanation
Correct Answer
D:`show ipv6 route` displays the router’s installed IPv6 routing information, including connected and learned prefixes. An interface summary can show addresses but not the complete collection of next-hop route entries.
Incorrect Answers
A:Interface addresses indicate local configuration, not all connected and learned IPv6 destination routes.
B:Neighbor cache contains local-link peers and link-layer mappings, not the complete IPv6 routing table.
C:Protocol state does not directly enumerate all installed IPv6 destination routes and resolved next hops.
Question 101
An IOS XE router interface has no manually configured global IPv6 address. The interface must have a usable IPv6 link-local source for neighbor discovery and on-link control messages; no upstream DHCPv6 server is required. Which addressing action or behavior is appropriate?
- Use stateful DHCPv6 solely to obtain the interface link-local address
- Use stateless DHCPv6 alone without router advertisements or link-local addressing
- Assign or derive a fe80::/10 link-local address
- Use the IPv6 multicast all-nodes address ff02::1 as the interface unicast source
Explanation
Correct Answer
C:IPv6 interfaces use link-local unicast addresses within fe80::/10 for neighbor discovery and local routing protocols, derived automatically or configured as supported without needing a DHCPv6 lease.
Incorrect Answers
A:DHCPv6 is not required for a link-local address; link-local addressing exists to support on-link operation independently of global address leases.
B:Stateless DHCPv6 can supply other configuration but does not itself replace necessary on-link IPv6 link-local addressing.
D:ff02::1 is multicast, not a unique link-local unicast address assigned to the router interface.
Question 102
A station must derive its own IPv6 address from a Router Advertisement prefix while retaining a route learned from RA, without requiring a stateful DHCPv6 address lease. Which addressing method fits?
- Use stateful DHCPv6 IA_NA leasing as the only IPv6 address source
- Use DHCPv6 prefix delegation to the workstation instead of RA for its LAN address
- Use SLAAC with an IPv6 router advertisement
- Use an IPv4 DHCP scope and infer IPv6 global address from an A record
Explanation
Correct Answer
C:SLAAC uses an advertised IPv6 prefix and host-generated interface identifier to construct an address without obtaining that address from a stateful DHCPv6 server. A valid RA prefix and autonomous-address flag are relevant prerequisites.
Incorrect Answers
A:Stateful assignment obtains an address from a server rather than autonomously constructing one from an RA prefix.
B:Prefix delegation commonly gives downstream routers prefixes and is not the described SLAAC host address formation.
D:IPv4 DHCP and DNS A records do not create the IPv6 address from a Router Advertisement prefix.
Question 103
Clients should form their own SLAAC IPv6 addresses from RAs but learn additional settings such as DNS servers from DHCPv6. Which stateless coordination model is appropriate?
- Use only stateless SLAAC with no additional DHCPv6 service even when DNS must come from DHCPv6
- Use only stateful DHCPv6 to allocate the IPv6 address and suppress SLAAC
- Use an IPv4 DHCP option 6 as the sole IPv6 resolver mechanism
- Use stateless DHCPv6 alongside RA-based addressing
Explanation
Correct Answer
D:Stateless DHCPv6 can supply auxiliary parameters such as DNS information while the host forms its address through SLAAC. It is therefore different from stateful DHCPv6, which can allocate the host address itself.
Incorrect Answers
A:RA-only addressing cannot obtain the stipulated DHCPv6-provided DNS option without an auxiliary service.
B:The requirement explicitly says hosts construct their own addresses from RA while using DHCPv6 only for other data.
C:An IPv4 address scope does not deliver the stipulated stateless DHCPv6 IPv6 resolver configuration.
Question 104
A VLAN's policy mandates stateful assignment of IPv6 interface addresses by DHCPv6 rather than SLAAC-generated global addresses. Which client-addressing mechanism is required in addition to router-advertised gateway discovery?
- Use SLAAC exclusively with an RA autonomous prefix and no DHCPv6 leasing
- Use stateless DHCPv6 to deliver only DNS while leaving address generation to the host
- Use IPv4 DHCPv4 address leases and rely on NAT64 to make a host IPv6 address
- Use stateful DHCPv6 addressing
Explanation
Correct Answer
D:Stateful DHCPv6 assigns an IPv6 address through a server-managed exchange; router advertisements may still be needed for default-router discovery. SLAAC does not require the DHCPv6 server to issue the address.
Incorrect Answers
A:SLAAC creates host-generated addresses and cannot meet centrally managed stateful address allocation.
B:Stateless DHCPv6 does not allocate the host IPv6 address as required.
C:DHCPv4 leases assign IPv4 addresses and are not stateful IPv6 IA_NA lease assignment.
Question 105
An IPv6 SLAAC lab builds an EUI-64 identifier from 00:25:96:12:34:56. Which transformation inserts the middle octets and modifies the universal/local bit as specified for modified EUI-64?
- Insert FE:FF but do not invert the universal/local bit
- Insert FF:FE but leave the MAC first-octet U/L bit untouched
- Hash the MAC with SHA-256 and use the first 64 bits as a deterministic EUI-64
- Insert FFFE and invert the universal/local bit
Explanation
Correct Answer
D:Modified EUI-64 expands a 48-bit MAC into a 64-bit identifier by inserting FFFE and changing the U/L bit.
Incorrect Answers
A:Modified EUI-64 specifies inserting FF:FE and toggling the U/L bit, not inserting FE:FF unchanged.
B:The expansion bytes are right, but the defined modified EUI-64 operation must invert that bit.
C:That is a different opaque-identifier derivation, not the specified modified EUI-64 MAC expansion.
Question 106
On a Cisco IOS interface that sends Router Advertisements, the hosts must be told to obtain their IPv6 interface addresses through stateful DHCPv6 rather than treating the RA as a stateless-only signal. Which interface command sets that specific RA bit?
- ipv6 unicast-routing in global configuration
- ipv6 nd other-config-flag on the LAN interface
- ipv6 nd managed-config-flag on the LAN interface
- ipv6 address autoconfig on the router interface
Explanation
Correct Answer
C:The managed-config-flag sets the RA M bit, instructing capable hosts that stateful DHCPv6 address configuration is available on the LAN.
Incorrect Answers
A:The global routing switch permits IPv6 forwarding but does not by itself announce the managed-address bit to hosts in this link’s RAs.
B:The other-configuration flag indicates availability of supplementary DHCPv6 information, not necessarily stateful DHCPv6 assignment of host addresses.
D:IPv6 address autoconfig controls how the router interface learns its own address, not what DHCPv6 mode its advertised LAN clients should use.
Question 107
An IOS Ethernet interface already has a working IPv6 unicast address, but a second distinct global address from another delegated prefix must be assigned to the same interface. Which configuration approach meets this multiaddress requirement?
- Use an additional ipv6 address command with the desired prefix
- Delete the first IPv6 address before assigning a second global unicast address
- Enter another ip address command with an IPv4 dotted-decimal netmask
- Add a static ipv6 route for the second prefix without configuring its own address
Explanation
Correct Answer
A:IOS interfaces can have multiple IPv6 unicast addresses on a single interface.
Incorrect Answers
B:A supported IOS IPv6 interface can hold multiple unicast addresses, so removing the existing one is unnecessary.
C:The interface requires IPv6 unicast addressing, not the IPv4-only ip address command.
D:A route advertises forwarding reachability but does not assign the requested additional unicast interface address.
Question 108
A technician needs to see per-interface IPv6 ND/RA settings and addresses on GigabitEthernet0/0, not merely a one-line address list. Which detailed inspection command fits?
- Run show ipv6 interface brief and expect all RA flags and ND timers in one line
- Run show ipv6 route to view interface Router Advertisement interval and flags
- Run show ipv6 neighbors to display the local RA settings rather than neighbors
- Use show ipv6 interface for that interface
Explanation
Correct Answer
D:Detailed IPv6 interface output includes enabled ND/RA behavior and address details.
Incorrect Answers
A:The brief display is suitable for addresses/state but does not expose the detailed ND/RA information requested.
B:Installed routes do not directly report that interface’s detailed RA/ND configuration.
C:ND neighbor cache lists peers and MAC mappings rather than interface RA prefixes, intervals, and flags.
Question 109
The router needs to identify the link-layer neighbor corresponding to a known on-link IPv6 next-hop address. Which IOS display shows the IPv6 neighbor discovery cache?
- Run show ipv6 route and use prefix next hop as if it included the peer MAC
- Run show arp to display IPv4 neighbor entries for the IPv6 destination
- Run show ipv6 interface brief to list the router’s own addresses
- Inspect show ipv6 neighbors
Explanation
Correct Answer
D:IPv6 Neighbor Discovery builds neighbor-cache address-to-link-layer mappings.
Incorrect Answers
A:Routing identifies next-hop IPv6 addresses and egress but not necessarily the learned Ethernet link-layer address.
B:IPv4 ARP does not resolve IPv6 neighbor link-layer mappings.
C:An interface address summary does not enumerate the neighbor IPv6-to-MAC cache needed.
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.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests
