Exam Bundle

That observation verifies tunnel ipsec profile binding in a different situation, such as when spoke-to-hub GRE packets are being sent without the required encryption because no tunnel protection profile is attached. For the reported nat-t reachability incident at an energy services network in Calgary, the required acceptance evidence is: The spoke behind NAT establishes IPsec and bidirectional encrypted traffic flows. This other result does not test that condition directly.

That observation verifies spoke multicast static mapping in a different situation, such as when a DMVPN spoke reaches the hub by unicast but its multicast routing hellos never reach the hub tunnel. For the reported nat-t reachability incident at an energy services network in Calgary, the required acceptance evidence is: The spoke behind NAT establishes IPsec and bidirectional encrypted traffic flows. This other result does not test that condition directly.

That observation verifies dmvpn nhrp network id mismatch in a different situation, such as when the hub and spoke use different NHRP network identifiers despite otherwise consistent tunnel addressing. For the reported nat-t reachability incident at an energy services network in Calgary, the required acceptance evidence is: The spoke behind NAT establishes IPsec and bidirectional encrypted traffic flows. This other result does not test that condition directly.

That approach is relevant to bgp weight precedence, such as when a local router chooses an unexpected egress because a neighbor-specific Cisco weight overrides a higher local preference on another path. That is a different root cause from the as path prepending inbound control fault observed at a cloud interconnect team in Toronto. Applying that approach alone would not establish the required result: External path choices can see a longer backup AS_PATH while the primary advertisement remains shorter.

That approach is relevant to ibgp next-hop preservation, such as when a router learns an eBGP route through iBGP but its NEXT_HOP points at an unreachable border address. That is a different root cause from the as path prepending inbound control fault observed at a cloud interconnect team in Toronto. Applying that approach alone would not establish the required result: External path choices can see a longer backup AS_PATH while the primary advertisement remains shorter.

That approach is relevant to bgp local preference, such as when multiple routers inside one AS need a consistent outbound exit preference, but the operator modifies MED on external advertisements instead. That is a different root cause from the as path prepending inbound control fault observed at a cloud interconnect team in Toronto. Applying that approach alone would not establish the required result: External path choices can see a longer backup AS_PATH while the primary advertisement remains shorter.

That observation verifies ebgp nonconnected loopback in a different situation, such as when bGP TCP connectivity over loopbacks fails because a multihop eBGP peer relies on a default one-hop TTL. For the reported as path prepending inbound control incident at a cloud interconnect team in Toronto, the required acceptance evidence is: External path choices can see a longer backup AS_PATH while the primary advertisement remains shorter. This other result does not test that condition directly.

That observation verifies bgp weight precedence in a different situation, such as when a local router chooses an unexpected egress because a neighbor-specific Cisco weight overrides a higher local preference on another path. For the reported as path prepending inbound control incident at a cloud interconnect team in Toronto, the required acceptance evidence is: External path choices can see a longer backup AS_PATH while the primary advertisement remains shorter. This other result does not test that condition directly.

That observation verifies bgp local preference in a different situation, such as when multiple routers inside one AS need a consistent outbound exit preference, but the operator modifies MED on external advertisements instead. For the reported as path prepending inbound control incident at a cloud interconnect team in Toronto, the required acceptance evidence is: External path choices can see a longer backup AS_PATH while the primary advertisement remains shorter. This other result does not test that condition directly.

That approach is relevant to urpf loose reachability, such as when loose uRPF is installed on an edge and administrators assume it verifies incoming interface symmetry. That is a different root cause from the standard acl source-only fault observed at a national retail head office in Sydney. Applying that approach alone would not establish the required result: Only the specified flow is filtered without blocking unrelated destinations from the same source.

That approach is relevant to urpf strict asymmetric routes, such as when legitimate multihomed source traffic is dropped by strict uRPF because the best reverse path uses another interface. That is a different root cause from the standard acl source-only fault observed at a national retail head office in Sydney. Applying that approach alone would not establish the required result: Only the specified flow is filtered without blocking unrelated destinations from the same source.

That approach is relevant to acl counter troubleshooting, such as when a new permit rule is blamed for a dropped service even though its hit counter never increases. That is a different root cause from the standard acl source-only fault observed at a national retail head office in Sydney. Applying that approach alone would not establish the required result: Only the specified flow is filtered without blocking unrelated destinations from the same source.

That observation verifies urpf strict asymmetric routes in a different situation, such as when legitimate multihomed source traffic is dropped by strict uRPF because the best reverse path uses another interface. For the reported standard acl source-only incident at a national retail head office in Sydney, the required acceptance evidence is: Only the specified flow is filtered without blocking unrelated destinations from the same source. This other result does not test that condition directly.

That observation verifies acl counter troubleshooting in a different situation, such as when a new permit rule is blamed for a dropped service even though its hit counter never increases. For the reported standard acl source-only incident at a national retail head office in Sydney, the required acceptance evidence is: Only the specified flow is filtered without blocking unrelated destinations from the same source. This other result does not test that condition directly.

That observation verifies acl implicit deny in a different situation, such as when a router ACL was built with one permit line and unexpectedly blocks all other traffic. For the reported standard acl source-only incident at a national retail head office in Sydney, the required acceptance evidence is: Only the specified flow is filtered without blocking unrelated destinations from the same source. This other result does not test that condition directly.

That approach is relevant to scp file transfer enablement, such as when an operator tries to securely copy router files using SCP but the device is configured only for unencrypted TFTP. That is a different root cause from the ssh transport restriction fault observed at a nationwide chain in Tokyo. Applying that approach alone would not establish the required result: SSH succeeds while Telnet connection attempts are not accepted on the management lines.

That approach is relevant to console versus vty recovery, such as when wAN routing is down and engineers try to troubleshoot using remote VTY login without a console or out-of-band plan. That is a different root cause from the ssh transport restriction fault observed at a nationwide chain in Tokyo. Applying that approach alone would not establish the required result: SSH succeeds while Telnet connection attempts are not accepted on the management lines.

That approach is relevant to ssh version legacy, such as when a legacy SSH protocol setting violates the organization's secure management baseline. That is a different root cause from the ssh transport restriction fault observed at a nationwide chain in Tokyo. Applying that approach alone would not establish the required result: SSH succeeds while Telnet connection attempts are not accepted on the management lines.

That observation verifies ssh source interface routing in a different situation, such as when management SSH works from one site but not another because replies leave through an unintended VRF or source path. For the reported ssh transport restriction incident at a nationwide chain in Tokyo, the required acceptance evidence is: SSH succeeds while Telnet connection attempts are not accepted on the management lines. This other result does not test that condition directly.

That observation verifies vty access-class management acl in a different situation, such as when untrusted subnets can open the router's SSH port even though the routing interfaces have unrelated ACLs. For the reported ssh transport restriction incident at a nationwide chain in Tokyo, the required acceptance evidence is: SSH succeeds while Telnet connection attempts are not accepted on the management lines. This other result does not test that condition directly.

That observation verifies https management instead of http in a different situation, such as when router web-management credentials traverse an unencrypted HTTP service despite a secure management requirement. For the reported ssh transport restriction incident at a nationwide chain in Tokyo, the required acceptance evidence is: SSH succeeds while Telnet connection attempts are not accepted on the management lines. This other result does not test that condition directly.

That approach is relevant to bgp address family activation, such as when an IPv6 BGP peer is Established for IPv4 but does not exchange IPv6 unicast routes because the IPv6 address family is inactive. That is a different root cause from the ebgp nonconnected loopback fault observed at a university backbone in Sydney. Applying that approach alone would not establish the required result: The session reaches Established over the approved multihop path.

That approach is relevant to ibgp next-hop preservation, such as when a router learns an eBGP route through iBGP but its NEXT_HOP points at an unreachable border address. That is a different root cause from the ebgp nonconnected loopback fault observed at a university backbone in Sydney. Applying that approach alone would not establish the required result: The session reaches Established over the approved multihop path.

That approach is relevant to ibgp loopback update-source, such as when an iBGP session configured to peer loopback-to-loopback remains Idle because the local source defaults to the physical interface. That is a different root cause from the ebgp nonconnected loopback fault observed at a university backbone in Sydney. Applying that approach alone would not establish the required result: The session reaches Established over the approved multihop path.

That observation verifies bgp remote as incorrect in a different situation, such as when a BGP peer sends an OPEN notification and rejects the relationship because the configured remote-as does not match its actual ASN. For the reported ebgp nonconnected loopback incident at a university backbone in Sydney, the required acceptance evidence is: The session reaches Established over the approved multihop path. This other result does not test that condition directly.

That observation verifies ibgp loopback update-source in a different situation, such as when an iBGP session configured to peer loopback-to-loopback remains Idle because the local source defaults to the physical interface. For the reported ebgp nonconnected loopback incident at a university backbone in Sydney, the required acceptance evidence is: The session reaches Established over the approved multihop path. This other result does not test that condition directly.

That observation verifies bgp address family activation in a different situation, such as when an IPv6 BGP peer is Established for IPv4 but does not exchange IPv6 unicast routes because the IPv6 address family is inactive. For the reported ebgp nonconnected loopback incident at a university backbone in Sydney, the required acceptance evidence is: The session reaches Established over the approved multihop path. This other result does not test that condition directly.

That approach is relevant to dmvpn tunnel key inconsistency, such as when gRE-encapsulated packets are rejected because the DMVPN endpoints use incompatible tunnel key settings. That is a different root cause from the ipsec outbound-only counters fault observed at a remote clinic network in Melbourne. Applying that approach alone would not establish the required result: Both encryption and decryption counters increase during bidirectional protected testing.

That approach is relevant to ike esp underlay filtering, such as when a DMVPN peer can ping its hub's public interface but IKE or ESP packets are blocked by a WAN ACL. That is a different root cause from the ipsec outbound-only counters fault observed at a remote clinic network in Melbourne. Applying that approach alone would not establish the required result: Both encryption and decryption counters increase during bidirectional protected testing.

That approach is relevant to ipsec ike proposal mismatch, such as when dMVPN NHRP can see underlay reachability but the IPsec negotiation fails because IKE policies have no compatible proposal. That is a different root cause from the ipsec outbound-only counters fault observed at a remote clinic network in Melbourne. Applying that approach alone would not establish the required result: Both encryption and decryption counters increase during bidirectional protected testing.

That observation verifies tunnel ipsec profile binding in a different situation, such as when spoke-to-hub GRE packets are being sent without the required encryption because no tunnel protection profile is attached. For the reported ipsec outbound-only counters incident at a remote clinic network in Melbourne, the required acceptance evidence is: Both encryption and decryption counters increase during bidirectional protected testing. This other result does not test that condition directly.

That observation verifies ike esp underlay filtering in a different situation, such as when a DMVPN peer can ping its hub's public interface but IKE or ESP packets are blocked by a WAN ACL. For the reported ipsec outbound-only counters incident at a remote clinic network in Melbourne, the required acceptance evidence is: Both encryption and decryption counters increase during bidirectional protected testing. This other result does not test that condition directly.

That observation verifies nat-t reachability in a different situation, such as when a DMVPN spoke behind NAT cannot establish IPsec because the path filters NAT traversal traffic. For the reported ipsec outbound-only counters incident at a remote clinic network in Melbourne, the required acceptance evidence is: Both encryption and decryption counters increase during bidirectional protected testing. This other result does not test that condition directly.