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That diagnosis is supported by a different symptom: A general permit line above the intended deny lets every source use the server HTTPS service. Here the recorded observation is: hosts in the adjacent half of 198.51.100.0/24 are unexpectedly permitted. The applicable cause is: the destination ACL wildcard matches a /24, not the intended /25.

That diagnosis is supported by a different symptom: The broad standard ACL blocks all protocols from a source instead of only HTTPS. Here the recorded observation is: hosts in the adjacent half of 198.51.100.0/24 are unexpectedly permitted. The applicable cause is: the destination ACL wildcard matches a /24, not the intended /25.

That diagnosis is supported by a different symptom: Ordinary DNS queries work but secondary DNS zone transfers fail. Here the recorded observation is: hosts in the adjacent half of 198.51.100.0/24 are unexpectedly permitted. The applicable cause is: the destination ACL wildcard matches a /24, not the intended /25.

That control reduces a separate risk: Standard IPv4 ACLs do not express the destination/port tuple needed for this policy. For the described design, the recurring risk arises from: the destination ACL wildcard matches a /24, not the intended /25. The specific required safeguard is: cross-check mask-to-wildcard calculations and test range edges.

That control reduces a separate risk: The ACL rule is written for response traffic rather than the initiating packet direction. For the described design, the recurring risk arises from: the destination ACL wildcard matches a /24, not the intended /25. The specific required safeguard is: cross-check mask-to-wildcard calculations and test range edges.

That control reduces a separate risk: ACL first-match evaluation encounters the overly broad permit before restrictive entries. For the described design, the recurring risk arises from: the destination ACL wildcard matches a /24, not the intended /25. The specific required safeguard is: cross-check mask-to-wildcard calculations and test range edges.

Adding required explicit permits would not address the need for order specific management permits. ACL processing stops at the earlier matching deny line and never reaches the later permit.

Applying an ordered extended ACL permitting the specified TCP443 tuple and deny unintended matching flows at the correct interface/direction would not address the need for order specific management permits.

Choosing the correct host-specific wildcard mask 0.0.0.0 or host syntax for the intended address would not address the need for order specific management permits.

This test measures a different behavior: Check ACL line match counters for the blocked host and another allowed address in the same /24. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect ordered ACL entries and hit counts for allowed management and blocked user hosts.

This test measures a different behavior: Test a matching allowed flow and an unlisted flow to verify expected accept/drop behavior. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect ordered ACL entries and hit counts for allowed management and blocked user hosts.

This test measures a different behavior: Test allowed and denied host-to-server TCP443 connections and inspect ACL counters. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect ordered ACL entries and hit counts for allowed management and blocked user hosts.

That diagnosis is supported by a different symptom: A new application fails because no permit exists for its destination in the applied ACL. Here the recorded observation is: sSH from an approved jump box is denied despite a permit statement lower in the list. The applicable cause is: aCL processing stops at the earlier matching deny line and never reaches the later permit.

That diagnosis is supported by a different symptom: A general permit line above the intended deny lets every source use the server HTTPS service. Here the recorded observation is: sSH from an approved jump box is denied despite a permit statement lower in the list. The applicable cause is: aCL processing stops at the earlier matching deny line and never reaches the later permit.

That diagnosis is supported by a different symptom: The entire subnet is denied when only a single host should be blocked. Here the recorded observation is: sSH from an approved jump box is denied despite a permit statement lower in the list. The applicable cause is: aCL processing stops at the earlier matching deny line and never reaches the later permit.

That control reduces a separate risk: The wildcard mask broadened source matching beyond the single IP address. For the described design, the recurring risk arises from: aCL processing stops at the earlier matching deny line and never reaches the later permit. The specific required safeguard is: run first-match policy analysis before ACL changes on production management interfaces.

That control reduces a separate risk: The implicit `deny ip any any` at the end blocks unmatched traffic. For the described design, the recurring risk arises from: aCL processing stops at the earlier matching deny line and never reaches the later permit. The specific required safeguard is: run first-match policy analysis before ACL changes on production management interfaces.

That control reduces a separate risk: ACL first-match evaluation encounters the overly broad permit before restrictive entries. For the described design, the recurring risk arises from: aCL processing stops at the earlier matching deny line and never reaches the later permit. The specific required safeguard is: run first-match policy analysis before ACL changes on production management interfaces.

Applying an IPv4 ACL with appropriate source/destination matching on the ingress SVI for the documented flow direction would not configure a supported IPv6 ACL with required IPv6 matches and attach it using the correct IPv6 interface direction.

Attaching the ACL at an actual routed interface carrying the traffic in the intended direction would not configure a supported IPv6 ACL with required IPv6 matches and attach it using the correct IPv6 interface direction.

Applying an ordered extended ACL permitting the specified TCP443 tuple and deny unintended matching flows at the correct interface/direction would not configure a supported IPv6 ACL with required IPv6 matches and attach it using the correct IPv6 interface direction.

This test measures a different behavior: Test allowed and denied host-to-server TCP443 connections and inspect ACL counters. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check IPv6 ACL counters and SSH reachability from allowed and denied IPv6 sources.

This test measures a different behavior: Run interface counters and a controlled deny test on the true forwarding path. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check IPv6 ACL counters and SSH reachability from allowed and denied IPv6 sources.

This test measures a different behavior: Inspect inbound ACL counters and successful permitted traffic in the unaffected direction. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check IPv6 ACL counters and SSH reachability from allowed and denied IPv6 sources.

That diagnosis is supported by a different symptom: A general permit line above the intended deny lets every source use the server HTTPS service. Here the recorded observation is: iPv6 management traffic remains open even though an IPv4 `ip access-group` exists. The applicable cause is: the IPv4 ACL does not independently filter IPv6 traffic.

That diagnosis is supported by a different symptom: The hostile subnet still reaches the SVI because the ACL was applied outbound toward users. Here the recorded observation is: iPv6 management traffic remains open even though an IPv4 `ip access-group` exists. The applicable cause is: the IPv4 ACL does not independently filter IPv6 traffic.

That diagnosis is supported by a different symptom: Disallowed traffic continues through the active VLAN interface without any ACL hits. Here the recorded observation is: iPv6 management traffic remains open even though an IPv4 `ip access-group` exists. The applicable cause is: the IPv4 ACL does not independently filter IPv6 traffic.

That control reduces a separate risk: ACL interface direction was reversed relative to arriving attack packets. For the described design, the recurring risk arises from: the IPv4 ACL does not independently filter IPv6 traffic. The specific required safeguard is: audit ACL coverage for both IPv4 and IPv6 when deploying dual-stack management.

That control reduces a separate risk: The ACL was applied on a logical interface outside the flow's forwarding path. For the described design, the recurring risk arises from: the IPv4 ACL does not independently filter IPv6 traffic. The specific required safeguard is: audit ACL coverage for both IPv4 and IPv6 when deploying dual-stack management.

That control reduces a separate risk: ACL first-match evaluation encounters the overly broad permit before restrictive entries. For the described design, the recurring risk arises from: the IPv4 ACL does not independently filter IPv6 traffic. The specific required safeguard is: audit ACL coverage for both IPv4 and IPv6 when deploying dual-stack management.

ACL first-match evaluation encounters the overly broad permit before restrictive entries. The ACL rule is written for response traffic rather than the initiating packet direction.

The ACL was applied on a logical interface outside the flow's forwarding path. The ACL rule is written for response traffic rather than the initiating packet direction.

Standard IPv4 ACLs do not express the destination/port tuple needed for this policy. The ACL rule is written for response traffic rather than the initiating packet direction.