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At a design agency, the security and networking lead needs RFC1918 addresses for an isolated branch LAN with no public address assignment. During review, someone proposes: "Allocate 11.0.0.0/8 as though it were RFC1918." Which technical explanation most directly shows why this proposal does not solve the requirement?
The 11/8 block is not one of the three RFC1918 private ranges. The effective remedy is to use an address from 10.0.0.0/8 for the internal host.
Link-local autoconfiguration is not RFC1918 centrally routed addressing. It concerns a different proposed change, not the change being evaluated.
224/4 is IPv4 multicast address space. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed allocate 11.0.0.0/8 as though it were rfc1918. The actual issue is that the 11/8 block is not one of the three RFC1918 private ranges.
The entire 10/8 block is private IPv4 space and is not globally internet-routed. The statement addresses a different mechanism. Here the engineer specifically proposed allocate 11.0.0.0/8 as though it were rfc1918; the decisive limitation is that the 11/8 block is not one of the three RFC1918 private ranges.
At a media studio, the on-call technician must verify whether address 172.31.88.10 can be used inside a private VLAN. During review, someone proposes: "Treat all of 172.0.0.0/8 as private." Which technical explanation most directly shows why this proposal does not solve the requirement?
Only the 172.16/12 subset is RFC1918. The effective remedy is to recognize 172.16.0.0/12 as the RFC1918 private 172-range.
127/8 is loopback, not the RFC1918 172 block. It concerns a different proposed change, not the change being evaluated.
RFC1918 covers 172.16.0.0 through 172.31.255.255 inclusive. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed treat all of 172.0.0.0/8 as private. The actual issue is that only the 172.16/12 subset is RFC1918.
172.32 exceeds the private range upper bound. This observation would apply to another device or feature, not the proposed treat all of 172.0.0.0/8 as private. For this scenario, only the 172.16/12 subset is RFC1918 is the direct cause.
At a telecom operations room, the security and networking lead is selecting a private subnet for an internal management segment using 192.168 addresses. During review, someone proposes: "Choose 192.169.0.0/16 as an RFC1918 range." Which technical explanation most directly shows why this proposal does not solve the requirement?
192.169/16 is not included in RFC1918 private space. The effective remedy is to choose a subnet within 192.168.0.0/16.
Limited broadcast is not an assignable unicast gateway. It concerns a different proposed change, not the change being evaluated.
192.168/16 is an RFC1918 private range commonly subnetted for internal use. The statement addresses a different mechanism. Here the engineer specifically proposed choose 192.169.0.0/16 as an rfc1918 range; the decisive limitation is that 192.169/16 is not included in RFC1918 private space.
198.51.100/24 is documentation-use TEST-NET-2, not a private-production allocation. This observation would apply to another device or feature, not the proposed choose 192.169.0.0/16 as an rfc1918 range. For this scenario, 192.169/16 is not included in RFC1918 private space is the direct cause.
At a retail branch, the security and networking lead has been allocated documented IPv6 LAN prefix 2001:db8:8304:e::/64. Which candidate interface address and prefix length preserves that allocation?
2001:db8:8304:e::38/64 is a host address inside 2001:db8:8304:e::/64 with the site /64 prefix intact. The /64 length is consistent with this LAN addressing requirement.
2001:db8:8304:e::27/128 applies a /128 host prefix rather than the /64 LAN prefix. A /128 is useful for a host route but not the requested LAN interface representation.
2001:db8:8304:e::94/48 describes a /48 aggregate rather than the designated /64 interface prefix. Assigning an interface a different prefix length changes on-link assumptions.
2001:db8:8304:f::20/64 changes the fourth hextet and lies in a different /64. Subnet identity includes all four initial hextets in 2001:db8:8304:e::/64.
At an engineering company, the migration lead has been allocated documented IPv6 LAN prefix 2001:db8:90d0:1e::/64. Which candidate interface address and prefix length preserves that allocation?
2001:db8:90d0:1e::e/64 is a host address inside 2001:db8:90d0:1e::/64 with the site /64 prefix intact. The /64 length is consistent with this LAN addressing requirement.
2001:db8:90d0:1e::14/48 describes a /48 aggregate rather than the designated /64 interface prefix. Assigning an interface a different prefix length changes on-link assumptions.
2001:db8:90d0:1e::47/128 applies a /128 host prefix rather than the /64 LAN prefix. A /128 is useful for a host route but not the requested LAN interface representation.
2001:db8:90d0:1f::20/64 changes the fourth hextet and lies in a different /64. Subnet identity includes all four initial hextets in 2001:db8:90d0:1e::/64.
At a factory, the site engineer has been allocated documented IPv6 LAN prefix 2001:db8:79ef:105::/64. Which candidate interface address and prefix length preserves that allocation?
2001:db8:79ef:105::5b/64 is a host address inside 2001:db8:79ef:105::/64 with the site /64 prefix intact. The /64 length is consistent with this LAN addressing requirement.
2001:db8:79ef:106::20/64 changes the fourth hextet and lies in a different /64. Subnet identity includes all four initial hextets in 2001:db8:79ef:105::/64.
2001:db8:79ef:105::b1/128 applies a /128 host prefix rather than the /64 LAN prefix. A /128 is useful for a host route but not the requested LAN interface representation.
2001:db8:79ef:105::a2/48 describes a /48 aggregate rather than the designated /64 interface prefix. Assigning an interface a different prefix length changes on-link assumptions.
A lab builds a modified EUI-64 interface ID from Ethernet MAC 00:11:22:33:44:55. Which 64-bit interface ID is produced after inserting FFFE and inverting the universal/local bit?
Insert ff:fe in the middle of the MAC and toggle the universal/local bit in the first octet from 00 to 02; then group as four IPv6 hextets.
This inserts FFFE but leaves the original first-octet universal/local bit unchanged. Modified EUI-64 requires the bit flip.
This omits the required ff:fe insertion between the OUI and device-specific MAC bytes.
This is part of the link-local address prefix, not the computed 64-bit interface identifier from the supplied MAC.
At an engineering company, the on-call technician has been allocated documented IPv6 LAN prefix 2001:db8:453e:166::/64. Which candidate interface address and prefix length preserves that allocation?
2001:db8:453e:166::68/64 is a host address inside 2001:db8:453e:166::/64 with the site /64 prefix intact. The /64 length is consistent with this LAN addressing requirement.
2001:db8:453e:166::6a/128 applies a /128 host prefix rather than the /64 LAN prefix. A /128 is useful for a host route but not the requested LAN interface representation.
2001:db8:453e:166::8a/48 describes a /48 aggregate rather than the designated /64 interface prefix. Assigning an interface a different prefix length changes on-link assumptions.
2001:db8:453e:167::20/64 changes the fourth hextet and lies in a different /64. Subnet identity includes all four initial hextets in 2001:db8:453e:166::/64.
A router has an IPv6 default route via fe80::2 on a directly connected Ethernet segment. Which additional identifier is needed so IOS can resolve the link-local next hop unambiguously?
IPv6 link-local addresses are only unique per link. IOS needs the egress interface to identify the neighbor and resolve fe80::2 on the proper segment.
Link-local addresses are interface scoped; IOS needs the egress interface with a fe80:: next hop for a usable IPv6 static route.
A fully specified link-local next hop uses the interface and fe80::2; a separate global address is not inherently required.
IPv6 default routing does not depend on IPv4-style PAT or NAT overload.
At a distribution center, the infrastructure lead has been allocated documented IPv6 LAN prefix 2001:db8:6c80:1d5::/64. Which candidate interface address and prefix length preserves that allocation?
2001:db8:6c80:1d5::7e/64 is a host address inside 2001:db8:6c80:1d5::/64 with the site /64 prefix intact. The /64 length is consistent with this LAN addressing requirement.
2001:db8:6c80:1d5::24/48 describes a /48 aggregate rather than the designated /64 interface prefix. Assigning an interface a different prefix length changes on-link assumptions.
2001:db8:6c80:1d5::19/128 applies a /128 host prefix rather than the /64 LAN prefix. A /128 is useful for a host route but not the requested LAN interface representation.
2001:db8:6c80:1d6::20/64 changes the fourth hextet and lies in a different /64. Subnet identity includes all four initial hextets in 2001:db8:6c80:1d5::/64.
A network capture on an Ethernet segment contains packets for ff02::2. Which interpretation of that IPv6 destination is correct?
FF02 denotes link-local multicast scope; ::2 is the well-known all-routers group, used by on-link IPv6 control traffic such as router solicitation.
FF00::/8 is multicast, not global unicast or anycast; the group is not routable beyond the link.
The all-nodes link-local group is ff02::1. FF02::2 targets routers that have joined the all-routers group.
The unspecified address is ::/128 and cannot function as a multicast destination.
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