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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.
Question 121
A host uses modified EUI-64 to convert its Ethernet MAC 00:25:96:12:34:56 into a 64-bit IPv6 interface identifier. Which identifier results after inserting FF:FE and inverting the universal/local bit?
- 0225:96ff:fe12:3456
- 0025:96ff:fe12:3456
- 0225:9612:3456:0000
- 0025:96ff:ff12:3456
Explanation
Correct Answer
A:Insert FF:FE in the middle (00:25:96:FF:FE:12:34:56) and toggle the first octet’s U/L bit, 00 to 02; the grouped identifier is 0225:96ff:fe12:3456.
Incorrect Answers
B:This inserts FF:FE but does not invert the first-octet universal/local bit, leaving 00 instead of 02.
C:The 64-bit identifier must contain FF:FE between the original 24-bit halves; padding at the end is not the conversion.
D:FF:FF is not the prescribed inserted 16-bit value, and the first octet also lacks the U/L-bit inversion.
Question 122
A client generates IPv6 interface identifiers that avoid embedding its hardware MAC and limit stable cross-network tracking. Which IID method should be used instead of predictable modified EUI-64?
- Generate a modified EUI-64 identifier by embedding the hardware MAC
- Use privacy or stable opaque interface identifiers
- Reuse an identical static 64-bit identifier on every subnet indefinitely
- Use the all-zero :: interface identifier for every endpoint
Explanation
Correct Answer
B:IPv6 hosts can create randomized or stable non-MAC-derived identifiers.
Incorrect Answers
A:That exposes predictable MAC-derived bits and contradicts the requirement to avoid hardware tracking.
C:A fixed cross-network identifier may permit tracking and lacks the privacy properties requested.
D:A repeated invalid/duplicate interface identifier is not a privacy-preserving address-generation strategy.
Question 123
A capture contains destination IPv6 multicast address ff05::1234. The operator must read the second octet’s scope field, not infer scope from an unrelated all-nodes group. Which multicast scope classification applies?
- Classify ff05::1234 as link-local multicast because any ff-prefix address must stay on one Ethernet link
- Classify ff05::1234 as IPv6 site-local multicast because its scope field has value 5
- Classify ff05::1234 as an ordinary globally routable unicast IPv6 host address
- Classify ff05::1234 as the ff02::2 all-routers link-local group despite its different address
Explanation
Correct Answer
B:The IPv6 multicast format uses the low four bits of the second octet as scope: value 5 is site-local, distinct from ff02 link-local scope.
Incorrect Answers
A:The ff prefix indicates multicast, but the scope nibble 5 is site-local rather than link-local scope value 2.
C:IPv6 multicast addresses start with ff and designate a multicast group rather than one globally reachable unicast host.
D:ff02::2 is a specific all-routers link-local group; ff05::1234 differs in both group identifier and site-local scope.
Question 124
A lab organization is delegated the IPv6 documentation prefix 2001:db8:100::/48. It wants separate conventional SLAAC-enabled Ethernet LANs with 64-bit interface identifiers for each department. Which prefix length should each ordinary LAN advertise?
- Use /48 on each Ethernet client LAN and assume standard SLAAC will use all 80 remaining bits
- A /64 IPv6 LAN prefix
- Use /127 on every broadcast-capable Ethernet host VLAN
- Use /128 for a shared LAN prefix and expect hosts to generate unique SLAAC identifiers
Explanation
Correct Answer
B:A conventional IPv6 SLAAC Ethernet subnet advertises a /64, leaving 64 interface-identifier bits for hosts. The documentation /48 permits many distinct /64 departments in this lab-only example.
Incorrect Answers
A:Typical SLAAC on standard Ethernet LANs uses a 64-bit prefix/interface identifier split, not a /48 on the client LAN.
C:/127 is used for some point-to-point routing links; it does not provide the ordinary SLAAC /64 addressing model.
D:/128 identifies a single complete address and leaves no host identifier space for a normal multi-host SLAAC LAN.
Question 125
Two datacenters provide the same IPv6 service using a single address advertised from both sites. The capture contains an ordinary unicast-format destination, not an ff multicast address. Which addressing model uses normal unicast syntax but can route to one of several service instances?
- A multicast ff00::/8 group where the network replicates the packet to all subscribers
- An IPv6 link-local fe80::/10 address that routers never forward between cities
- An ordinary unicast address assigned uniquely to only one of the two service routers
- IPv6 anycast with unicast-style address syntax
Explanation
Correct Answer
D:IPv6 anycast uses an address from ordinary unicast address space that can be assigned to multiple service instances; unicast routing delivers a packet to one reachable instance rather than to all subscribers.
Incorrect Answers
A:Multiple recipients receive multicast; the case shares one unicast-format service address but routes to one instance.
B:Link-local addresses cannot be routed between the stated geographically separated sites.
C:A unique-unicast service on one router does not describe the shared-address multi-instance service requested.
Question 126
A Windows workstation has incorrect DNS and default-gateway settings after DHCP renewal. The help desk needs complete adapter addresses, DNS server lists and lease details in one command. Which Windows command fits?
- Run ipconfig /all
- Run ipconfig without /all and assume every DHCP lease and DNS detail appears
- Run route print alone to list all DNS server settings and DHCP lease times
- Run nslookup for one domain and infer the full interface address lease
Explanation
Correct Answer
A:Windows `ipconfig /all` reveals each adapter’s addressing, mask, default gateway, DNS servers and DHCP lease state. Basic `ipconfig` omits several of the detailed fields needed to troubleshoot configuration.
Incorrect Answers
B:Basic ipconfig can omit DHCP lease and detailed resolver information that /all exposes.
C:The Windows route table shows forwarding entries but not all adapter DNS server lists and lease parameters.
D:A DNS query tests resolution but cannot summarize every adapter gateway, DNS configuration and lease.
Question 127
On a Linux laptop, the user can ping its own LAN address but remote networks fail. The technician must examine which default route and next hop the kernel has installed. Which Linux command focuses on that route?
- Run ip route show default
- Run ip address show only and read assigned IPs as a default route
- Run dig example.test to test DNS and assume its answer proves a default route
- Run arp -n to list local IPv4 neighbors and assume they define the default route
Explanation
Correct Answer
A:Linux `ip route show default` filters the kernel IPv4 routing table to the default route and its gateway/interface when present. It is a route inspection operation, not a command to assign a new address.
Incorrect Answers
B:Interface addresses do not directly enumerate which default gateway/egress route the Linux kernel installed.
C:DNS lookup results cannot directly show the kernel’s default route selection.
D:ARP entries can map gateways after selection but do not identify which default route and device the kernel uses.
Question 128
On Linux, an interface may have the wrong IPv4/IPv6 address or prefix. The operator wants a read-only listing of assigned interface addresses rather than DNS lookup output. Which command fits?
- Run ip route show default, which omits many local interface address entries
- Run ip address show
- Run dig A example.test and assume DNS results report interface prefixes
- Run ss -tna to list socket state rather than interface addresses
Explanation
Correct Answer
B:Linux `ip address show` displays IPv4 and IPv6 addresses bound to local interfaces, including prefix lengths. A separate `ip route` command is needed to inspect how packets are forwarded beyond those links.
Incorrect Answers
A:The default-route display identifies a gateway rather than listing all IPv4/IPv6 addresses on local interfaces.
C:A DNS answer concerns a remote domain and does not enumerate configured Linux interface addresses.
D:Socket connections do not provide the assigned IPv4/IPv6 prefix list for each interface.
Question 129
An engineer must read interface IP information on a Mac or a legacy Unix host where the available tooling includes ifconfig or Apple's networksetup. Which OS-appropriate utility should be selected?
- Run Windows ipconfig /all on macOS and assume identical syntax
- Run ifconfig or networksetup appropriately
- Run Linux ip route show default as the only interface address inventory
- Run a DNS-only lookup command and treat the answer as local interface state
Explanation
Correct Answer
B:macOS network tools expose assigned addresses and interface state.
Incorrect Answers
A:The Windows ipconfig output conventions are not the macOS/legacy Unix utility requested.
C:Routing entries and platform-specific Linux syntax are not the Mac/legacy Unix interface-address inspection requested.
D:DNS resolution does not list the local Mac/Unix interface IP, mask and link configuration.
Question 130
A browser fails to resolve `helpdesk.example.test`, but the user still has an IP route. The technician needs to query DNS resolution directly and inspect the returned records. Which tool is appropriate?
- Run ip route show default and infer DNS record results from the next-hop IP
- Run nslookup or dig for the specified name
- Run ip address show to examine local prefixes without sending a DNS query
- Run ss -lnt to list local TCP listening sockets
Explanation
Correct Answer
B:A DNS lookup utility directly queries configured or selected resolvers.
Incorrect Answers
A:A working default route does not establish whether the DNS resolver returns the requested hostname record.
C:Local interface addressing is distinct from actually querying a resolver for the failed hostname.
D:Open local listening ports do not report the DNS records returned for a remote name.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests
