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At a research campus, a network operations engineer must choose an IPv6 source for neighbor discovery on one local Ethernet segment. Which choice best addresses the stated requirement?
Neighbor discovery relies on link-local addresses within a link scope.
Multicast represents a group destination, not a host source.
The source field expects a 128-bit IPv6 address.
The unspecified address is only used in restricted initialization cases, not as stable host identity.
At a regional hospital, the site engineer wants internally scoped IPv6 addressing not intended for globally routable internet announcements. Which choice best addresses the stated requirement?
ULA space supports internal addressing independently of public allocations.
Unspecified address is not assignable to all hosts.
Link-local FE80 cannot be routed between sites.
FF02 is link-local-scope IPv6 multicast, not ULA.
At a satellite office, the migration lead requires one packet to reach a group of listeners that joined an IPv6 service group. Which choice best addresses the stated requirement?
Multicast addressing targets subscribed recipients according to multicast scope.
IPv6 uses multicast rather than IPv4 broadcast addressing.
Loopback stays on the sending host.
FE80 is a link-local unicast scope, not an IPv6 multicast prefix.
At an airport terminal, the campus network lead is placing identical IPv6 service addresses on multiple geographically separated nodes and expects routing to choose a nearby instance. Which choice best addresses the stated requirement?
Anycast uses the same unicast destination on multiple nodes; routing selects an available route.
Link-local addresses cannot be routed between sites.
Multicast can reach many listeners, which differs from anycast one-of-many delivery.
Loopback does not forward traffic across a network.
At an enterprise data center, a network operations engineer must derive an interface identifier from MAC 00:25:96:12:34:56 using modified EUI-64. Which choice best addresses the stated requirement?
Modified EUI-64 transforms the 48-bit MAC into a 64-bit interface ID and flips its U/L bit.
A direct MAC copy is not the specified modified EUI-64 construction.
Modified EUI-64 also toggles the universal/local bit.
The resulting IID is only part of a full IPv6 address.
At a school district, the site engineer needs to identify a globally routable IPv6 unicast prefix rather than an interface link-local source. During review, someone proposes: "Use fe80::/10 as a public transit allocation." Which technical explanation most directly shows why this proposal does not solve the requirement?
FE80 is link-local and is not routed beyond the link. The effective remedy is to treat 2001:db8::/32 as documentation for the global-unicast address format, not a real deployable public allocation.
The ::1/128 loopback never leaves a host, so it cannot serve as the globally reachable transit address demanded in the question.
Global unicast normally falls under 2000::/3; 2001:db8::/32 is reserved specifically for examples. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed use fe80::/10 as a public transit allocation. The actual issue is that fE80 is link-local and is not routed beyond the link.
FF00::/8 is multicast, while fe80::/10 is link-local unicast; neither is a public routed transit allocation.
At a hotel, the campus network lead must choose an IPv6 source for neighbor discovery on one local Ethernet segment. During review, someone proposes: "Use a multicast group address as the unique source." Which technical explanation most directly shows why this proposal does not solve the requirement?
Multicast represents a group destination, not a host source. The effective remedy is to use an assigned link-local address from fe80::/10.
The unspecified address is only used in restricted initialization cases, not as stable host identity. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed use a multicast group address as the unique source. The actual issue is that multicast represents a group destination, not a host source.
Neighbor discovery relies on link-local addresses within a link scope. The statement addresses a different mechanism. Here the engineer specifically proposed use a multicast group address as the unique source; the decisive limitation is that multicast represents a group destination, not a host source.
The source field expects a 128-bit IPv6 address. It concerns a different proposed change, not the change being evaluated.
At an enterprise data center, the site engineer wants internally scoped IPv6 addressing not intended for globally routable internet announcements. During review, someone proposes: "Use ff02::/16 as unique-local unicast." Which technical explanation most directly shows why this proposal does not solve the requirement?
FF02 is link-local-scope IPv6 multicast, not ULA. The effective remedy is to use a planned unique-local prefix in fc00::/7, normally fd00::/8 for locally assigned ULAs.
Link-local FE80 cannot be routed between sites. This observation would apply to another device or feature, not the proposed use ff02::/16 as unique-local unicast. For this scenario, fF02 is link-local-scope IPv6 multicast, not ULA is the direct cause.
Unspecified address is not assignable to all hosts. It concerns a different proposed change, not the change being evaluated.
ULA space supports internal addressing independently of public allocations. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed use ff02::/16 as unique-local unicast. The actual issue is that fF02 is link-local-scope IPv6 multicast, not ULA.
At an insurance company, the security and networking lead requires one packet to reach a group of listeners that joined an IPv6 service group. During review, someone proposes: "Use ::1 as a remote group destination." Which technical explanation most directly shows why this proposal does not solve the requirement?
Loopback stays on the sending host. The effective remedy is to send to an appropriate ff00::/8 IPv6 multicast address.
Multicast addressing targets subscribed recipients according to multicast scope. This observation would apply to another device or feature, not the proposed use ::1 as a remote group destination. For this scenario, loopback stays on the sending host is the direct cause.
FE80 is a link-local unicast scope, not an IPv6 multicast prefix. A true general network fact is not necessarily the direct diagnosis. The named change was use ::1 as a remote group destination, whose relevant defect is that loopback stays on the sending host.
IPv6 uses multicast rather than IPv4 broadcast addressing. It concerns a different proposed change, not the change being evaluated.
At a manufacturing plant, a network administrator is placing identical IPv6 service addresses on multiple geographically separated nodes and expects routing to choose a nearby instance. During review, someone proposes: "Use one FF00 multicast group to select exactly one nearest server." Which technical explanation most directly shows why this proposal does not solve the requirement?
Multicast can reach many listeners, which differs from anycast one-of-many delivery. The effective remedy is to use an anycast design with route advertisements for the shared unicast address.
Link-local addresses cannot be routed between sites. That distinction is technically relevant elsewhere, but it does not identify the failure of the proposed use one ff00 multicast group to select exactly one nearest server. The actual issue is that multicast can reach many listeners, which differs from anycast one-of-many delivery.
Loopback does not forward traffic across a network. It concerns a different proposed change, not the change being evaluated.
Anycast uses the same unicast destination on multiple nodes; routing selects an available route. This observation would apply to another device or feature, not the proposed use one ff00 multicast group to select exactly one nearest server. For this scenario, multicast can reach many listeners, which differs from anycast one-of-many delivery is the direct cause.
At a regional hospital, the branch support lead must derive an interface identifier from MAC 00:25:96:12:34:56 using modified EUI-64. During review, someone proposes: "Copy the MAC unchanged as a 48-bit interface ID." Which technical explanation most directly shows why this proposal does not solve the requirement?
A direct MAC copy is not the specified modified EUI-64 construction. The effective remedy is to insert ff:fe into the MAC middle and invert the U/L bit of the first octet.
The resulting IID is only part of a full IPv6 address. It concerns a different proposed change, not the change being evaluated.
Modified EUI-64 also toggles the universal/local bit. The statement addresses a different mechanism. Here the engineer specifically proposed copy the mac unchanged as a 48-bit interface id; the decisive limitation is that a direct MAC copy is not the specified modified EUI-64 construction.
Modified EUI-64 transforms the 48-bit MAC into a 64-bit interface ID and flips its U/L bit. A true general network fact is not necessarily the direct diagnosis. The named change was copy the mac unchanged as a 48-bit interface id, whose relevant defect is that a direct MAC copy is not the specified modified EUI-64 construction.
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