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That diagnosis is supported by a different symptom: Only one internal user can establish a translation while the second collides with the same public mapping. Here the recorded observation is: no translations are created for packets that otherwise match the source ACL. The applicable cause is: the NAT inside/outside interface roles are absent or reversed for packet direction.

That diagnosis is supported by a different symptom: Old-subnet users reach the Internet while new-subnet users' traffic is not translated. Here the recorded observation is: no translations are created for packets that otherwise match the source ACL. The applicable cause is: the NAT inside/outside interface roles are absent or reversed for packet direction.

That diagnosis is supported by a different symptom: Each router reports local HSRP state but hosts see intermittent default-gateway ARP behavior. Here the recorded observation is: no translations are created for packets that otherwise match the source ACL. The applicable cause is: the NAT inside/outside interface roles are absent or reversed for packet direction.

That control reduces a separate risk: Dynamic PAT was used where a stable one-to-one NAT identity was required. For the described design, the recurring risk arises from: the NAT inside/outside interface roles are absent or reversed for packet direction. The specific required safeguard is: include role verification in NAT change templates for ISP circuit migrations.

That control reduces a separate risk: The NAT classification access list does not match the newly added inside source prefix. For the described design, the recurring risk arises from: the NAT inside/outside interface roles are absent or reversed for packet direction. The specific required safeguard is: include role verification in NAT change templates for ISP circuit migrations.

That control reduces a separate risk: The configuration lacks overload port translation needed to multiplex many sessions onto one IP. For the described design, the recurring risk arises from: the NAT inside/outside interface roles are absent or reversed for packet direction. The specific required safeguard is: include role verification in NAT change templates for ISP circuit migrations.

Marking the appropriate LAN and ISP interfaces with correct NAT inside/outside roles would not update the NAT source match to include the approved new subnet without widening to unintended sources.

Configuring supported NTP authentication/key associations and restricting permitted peers where required would not update the NAT source match to include the approved new subnet without widening to unintended sources.

Configuring NAT overload/PAT from approved inside sources to the outside interface address would not update the NAT source match to include the approved new subnet without widening to unintended sources.

This test measures a different behavior: Check authenticated NTP association state and reject test replies from an untrusted peer. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect translation hit counters per subnet and verify only authorized prefixes translate.

This test measures a different behavior: Check per-interface NAT role and dynamic translation hits for a test LAN connection. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect translation hit counters per subnet and verify only authorized prefixes translate.

This test measures a different behavior: Check unique source-port translations for concurrent inside connections and verify return traffic. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect translation hit counters per subnet and verify only authorized prefixes translate.

That diagnosis is supported by a different symptom: Only one internal user can establish a translation while the second collides with the same public mapping. Here the recorded observation is: old-subnet users reach the Internet while new-subnet users' traffic is not translated. The applicable cause is: the NAT classification access list does not match the newly added inside source prefix.

That diagnosis is supported by a different symptom: The device synchronizes to an unauthorized source rather than the approved time reference. Here the recorded observation is: old-subnet users reach the Internet while new-subnet users' traffic is not translated. The applicable cause is: the NAT classification access list does not match the newly added inside source prefix.

That diagnosis is supported by a different symptom: No translations are created for packets that otherwise match the source ACL. Here the recorded observation is: old-subnet users reach the Internet while new-subnet users' traffic is not translated. The applicable cause is: the NAT classification access list does not match the newly added inside source prefix.

That control reduces a separate risk: NTP source authentication or access controls are not enforcing the trust requirement. For the described design, the recurring risk arises from: the NAT classification access list does not match the newly added inside source prefix. The specific required safeguard is: review NAT ACL source coverage alongside DHCP scope and VLAN creation.

That control reduces a separate risk: The NAT inside/outside interface roles are absent or reversed for packet direction. For the described design, the recurring risk arises from: the NAT classification access list does not match the newly added inside source prefix. The specific required safeguard is: review NAT ACL source coverage alongside DHCP scope and VLAN creation.

That control reduces a separate risk: The configuration lacks overload port translation needed to multiplex many sessions onto one IP. For the described design, the recurring risk arises from: the NAT classification access list does not match the newly added inside source prefix. The specific required safeguard is: review NAT ACL source coverage alongside DHCP scope and VLAN creation.

Configuring supported interface/object tracking to reduce HSRP priority on upstream failure would not assign consistent HSRP group virtual IP and set suitable priority/preempt policy on the intended primary.

Configuring the same correct virtual gateway IP and grouping parameters on both HSRP members would not assign consistent HSRP group virtual IP and set suitable priority/preempt policy on the intended primary.

Account for VRRP address-owner and priority behavior when assigning the intended master would not assign consistent HSRP group virtual IP and set suitable priority/preempt policy on the intended primary.

This test measures a different behavior: Check group virtual IP, authentication and hello settings at both routers. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check HSRP group Active/Standby roles and virtual address ARP after a controlled failover.

This test measures a different behavior: Inspect VRRP virtual IP ownership and master/backup election state. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check HSRP group Active/Standby roles and virtual address ARP after a controlled failover.

This test measures a different behavior: Disable the upstream link and confirm the healthy standby takes over the virtual gateway. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check HSRP group Active/Standby roles and virtual address ARP after a controlled failover.

That diagnosis is supported by a different symptom: Clients keep forwarding through an HSRP Active router with no WAN path. Here the recorded observation is: the lower-priority router stays Active after the preferred router recovers although preemption was required. The applicable cause is: the preferred HSRP peer lacks the intended preempt behavior or priority policy.

That diagnosis is supported by a different symptom: Each router reports local HSRP state but hosts see intermittent default-gateway ARP behavior. Here the recorded observation is: the lower-priority router stays Active after the preferred router recovers although preemption was required. The applicable cause is: the preferred HSRP peer lacks the intended preempt behavior or priority policy.

That diagnosis is supported by a different symptom: A router configured as the IP address owner remains VRRP Master against a non-owner with nominally high priority. Here the recorded observation is: the lower-priority router stays Active after the preferred router recovers although preemption was required. The applicable cause is: the preferred HSRP peer lacks the intended preempt behavior or priority policy.

That control reduces a separate risk: Peers disagree on virtual address/group configuration and cannot provide coherent redundancy. For the described design, the recurring risk arises from: the preferred HSRP peer lacks the intended preempt behavior or priority policy. The specific required safeguard is: test recovery as well as failure when changing FHRP settings.

That control reduces a separate risk: HSRP tracked-object policy does not detect or penalize upstream loss. For the described design, the recurring risk arises from: the preferred HSRP peer lacks the intended preempt behavior or priority policy. The specific required safeguard is: test recovery as well as failure when changing FHRP settings.

That control reduces a separate risk: VRRP address ownership carries special priority behavior not captured by ordinary non-owner settings. For the described design, the recurring risk arises from: the preferred HSRP peer lacks the intended preempt behavior or priority policy. The specific required safeguard is: test recovery as well as failure when changing FHRP settings.

Configuring the same correct virtual gateway IP and grouping parameters on both HSRP members would not configure supported interface/object tracking to reduce HSRP priority on upstream failure.

Assigning consistent HSRP group virtual IP and setting suitable priority/preempt policy on the intended primary would not configure supported interface/object tracking to reduce HSRP priority on upstream failure.

Follow RPF checks by ensuring unicast routing toward the multicast source identifies the receiving interface would not configure supported interface/object tracking to reduce HSRP priority on upstream failure.