Exam Bundle

That observation verifies tacacs+ transport port in a different situation, such as when a firewall allows RADIUS UDP but TACACS+ management logins still fail because its dedicated transport is blocked. For the reported tacacs secret mismatch incident at a telecommunications branch in Oslo, the required acceptance evidence is: AAA requests receive valid authenticated replies without decryption or integrity failures. This other result does not test that condition directly.

That observation verifies aaa exec authorization in a different situation, such as when users pass login authentication but never receive authorized EXEC access because the required exec authorization method is missing. For the reported tacacs secret mismatch incident at a telecommunications branch in Oslo, the required acceptance evidence is: AAA requests receive valid authenticated replies without decryption or integrity failures. This other result does not test that condition directly.

That observation verifies radius authentication transport in a different situation, such as when a router's RADIUS server is reachable by ICMP but RADIUS requests time out because authentication and accounting UDP ports are blocked. For the reported tacacs secret mismatch incident at a telecommunications branch in Oslo, the required acceptance evidence is: AAA requests receive valid authenticated replies without decryption or integrity failures. This other result does not test that condition directly.

That approach is relevant to bgp as path loop detection, such as when an eBGP neighbor advertises a prefix whose AS_PATH already contains the local autonomous system; the prefix is rejected. That is a different root cause from the vrf selective leaking fault observed at a multinational data center in Frankfurt. Applying that approach alone would not establish the required result: Only the specifically authorized shared subnet is reachable across the defined VRF boundary.

That approach is relevant to eigrp delay/bandwidth metric, such as when an interface's documented bandwidth differs from its configured EIGRP bandwidth and delay inputs, creating unexpected path costs. That is a different root cause from the vrf selective leaking fault observed at a multinational data center in Frankfurt. Applying that approach alone would not establish the required result: Only the specifically authorized shared subnet is reachable across the defined VRF boundary.

That approach is relevant to mutual redistribution metric integrity, such as when bGP-origin routes entering EIGRP are given arbitrary seed metrics that make a slow backup path appear better than intended. That is a different root cause from the vrf selective leaking fault observed at a multinational data center in Frankfurt. Applying that approach alone would not establish the required result: Only the specifically authorized shared subnet is reachable across the defined VRF boundary.

That observation verifies ibgp next-hop preservation in a different situation, such as when a router learns an eBGP route through iBGP but its NEXT_HOP points at an unreachable border address. For the reported vrf selective leaking incident at a multinational data center in Frankfurt, the required acceptance evidence is: Only the specifically authorized shared subnet is reachable across the defined VRF boundary. This other result does not test that condition directly.

That observation verifies bgp next-hop reachability before ad in a different situation, such as when an eBGP route appears in the BGP table but not the RIB; an operator immediately changes BGP AD without examining the peer-advertised next hop. For the reported vrf selective leaking incident at a multinational data center in Frankfurt, the required acceptance evidence is: Only the specifically authorized shared subnet is reachable across the defined VRF boundary. This other result does not test that condition directly.

That observation verifies ospf external subnets redistribution in a different situation, such as when a redistribution statement is intended to carry multiple classless subnets into OSPF but only classful behavior is observed in the configured IOS context. For the reported vrf selective leaking incident at a multinational data center in Frankfurt, the required acceptance evidence is: Only the specifically authorized shared subnet is reachable across the defined VRF boundary. This other result does not test that condition directly.

That approach is relevant to dhcp giaddr subnet selection, such as when a central DHCP server selects the wrong scope for remote clients because the relay's gateway address is unexpected. That is a different root cause from the dhcp relay udp filtering fault observed at a research institution in Helsinki. Applying that approach alone would not establish the required result: Relayed DHCP messages receive replies and remote clients obtain leases.

That approach is relevant to dhcp relay helper address, such as when broadcast DHCPDISCOVER packets from remote VLAN clients never reach the central DHCP server. That is a different root cause from the dhcp relay udp filtering fault observed at a research institution in Helsinki. Applying that approach alone would not establish the required result: Relayed DHCP messages receive replies and remote clients obtain leases.

That approach is relevant to dhcpv6 relay missing, such as when iPv6 clients on a remote link cannot contact the centralized stateful DHCPv6 server through their local router. That is a different root cause from the dhcp relay udp filtering fault observed at a research institution in Helsinki. Applying that approach alone would not establish the required result: Relayed DHCP messages receive replies and remote clients obtain leases.

That observation verifies stateless dhcpv6 with slaac in a different situation, such as when a VLAN wants SLAAC-generated addresses with DHCPv6 providing other information, but the router advertises the managed-address stateful flag. For the reported dhcp relay udp filtering incident at a research institution in Helsinki, the required acceptance evidence is: Relayed DHCP messages receive replies and remote clients obtain leases. This other result does not test that condition directly.

That observation verifies dhcp duplicate leased ip in a different situation, such as when the DHCP server offers an IPv4 address already in use and hosts report duplicate-address alerts. For the reported dhcp relay udp filtering incident at a research institution in Helsinki, the required acceptance evidence is: Relayed DHCP messages receive replies and remote clients obtain leases. This other result does not test that condition directly.

That observation verifies dhcp default router option in a different situation, such as when clients obtain an IPv4 address and mask but have no valid default gateway because the pool's default-router option is incorrect. For the reported dhcp relay udp filtering incident at a research institution in Helsinki, the required acceptance evidence is: Relayed DHCP messages receive replies and remote clients obtain leases. This other result does not test that condition directly.

That approach is relevant to acl first-match ordering, such as when a broad permit appears before a targeted deny, so traffic to a prohibited TCP port passes. That is a different root cause from the acl counter troubleshooting fault observed at an industrial switching campus in Hamburg. Applying that approach alone would not establish the required result: Packets hit the expected ACL entry and the policy outcome matches the flow.

That approach is relevant to ipv6 traffic-filter attachment, such as when an IPv6 access list is configured but never filters a routed interface because only IPv4 ip access-group was applied. That is a different root cause from the acl counter troubleshooting fault observed at an industrial switching campus in Hamburg. Applying that approach alone would not establish the required result: Packets hit the expected ACL entry and the policy outcome matches the flow.

That approach is relevant to acl applied wrong direction, such as when an extended IPv4 ACL correctly describes unwanted inbound traffic but was attached outbound on the wrong router interface. That is a different root cause from the acl counter troubleshooting fault observed at an industrial switching campus in Hamburg. Applying that approach alone would not establish the required result: Packets hit the expected ACL entry and the policy outcome matches the flow.

That observation verifies router control-plane versus interface acl in a different situation, such as when an engineer relies on a transit ACL to protect all router CPU services even though router-destined flows use different paths. For the reported acl counter troubleshooting incident at an industrial switching campus in Hamburg, the required acceptance evidence is: Packets hit the expected ACL entry and the policy outcome matches the flow. This other result does not test that condition directly.

That observation verifies time-based acl inactive in a different situation, such as when a time-range ACL permits scheduled maintenance only during a defined window, but the rule is ineffective due to clock drift. For the reported acl counter troubleshooting incident at an industrial switching campus in Hamburg, the required acceptance evidence is: Packets hit the expected ACL entry and the policy outcome matches the flow. This other result does not test that condition directly.

That observation verifies ipv4 wildcard calculation in a different situation, such as when a subnet 10.24.8.0/21 is matched with a 0.0.0.255 wildcard, excluding the remaining component networks. For the reported acl counter troubleshooting incident at an industrial switching campus in Hamburg, the required acceptance evidence is: Packets hit the expected ACL entry and the policy outcome matches the flow. This other result does not test that condition directly.

That approach is relevant to pe core versus customer forwarding, such as when a P router in the MPLS core is expected to contain every customer IPv4 prefix to forward VPN traffic. That is a different root cause from the bgp extended community transmission fault observed at a fintech private WAN in Mumbai. Applying that approach alone would not establish the required result: Received VPNv4 paths retain the intended RT and are imported only into authorized VRFs.

That approach is relevant to vpn service inner label, such as when transport labels carry packets to the destination PE but the PE lacks a usable VPN label for the customer's destination context. That is a different root cause from the bgp extended community transmission fault observed at a fintech private WAN in Mumbai. Applying that approach alone would not establish the required result: Received VPNv4 paths retain the intended RT and are imported only into authorized VRFs.

That approach is relevant to route distinguisher overlapping tenants, such as when two customers both advertise 10.10.0.0/16 and the operator assumes ordinary IPv4 BGP can carry them without unique VPN identity. That is a different root cause from the bgp extended community transmission fault observed at a fintech private WAN in Mumbai. Applying that approach alone would not establish the required result: Received VPNv4 paths retain the intended RT and are imported only into authorized VRFs.

That observation verifies no unsolicited inter-vrf communication in a different situation, such as when two VRFs on one PE have valid routes but customer staff expect automatic communication across them. For the reported bgp extended community transmission incident at a fintech private WAN in Mumbai, the required acceptance evidence is: Received VPNv4 paths retain the intended RT and are imported only into authorized VRFs. This other result does not test that condition directly.

That observation verifies route-target import missing in a different situation, such as when the remote PE receives a VPNv4 route but the destination tenant VRF does not import it because RT values do not match. For the reported bgp extended community transmission incident at a fintech private WAN in Mumbai, the required acceptance evidence is: Received VPNv4 paths retain the intended RT and are imported only into authorized VRFs. This other result does not test that condition directly.

That observation verifies vpnv4 bgp family in a different situation, such as when pE loopback BGP peers are Established for ordinary IPv4 unicast but customer VPN prefixes are absent. For the reported bgp extended community transmission incident at a fintech private WAN in Mumbai, the required acceptance evidence is: Received VPNv4 paths retain the intended RT and are imported only into authorized VRFs. This other result does not test that condition directly.

That approach is relevant to eigrp stub leaf, such as when a remote branch does not transit traffic yet its router receives network-wide EIGRP query requests for unrelated destinations. That is a different root cause from the eigrp passive-interface fault observed at a logistics WAN in Rotterdam. Applying that approach alone would not establish the required result: Hello exchanges resume on the routing link without creating unexpected user-LAN adjacencies.

That approach is relevant to eigrp named mode af-interface, such as when a named EIGRP configuration has the correct AS but an interface is not participating in its address family. That is a different root cause from the eigrp passive-interface fault observed at a logistics WAN in Rotterdam. Applying that approach alone would not establish the required result: Hello exchanges resume on the routing link without creating unexpected user-LAN adjacencies.

That approach is relevant to eigrp authentication key, such as when two routers see EIGRP hellos but never form neighbors after authentication was enabled with mismatched key configurations. That is a different root cause from the eigrp passive-interface fault observed at a logistics WAN in Rotterdam. Applying that approach alone would not establish the required result: Hello exchanges resume on the routing link without creating unexpected user-LAN adjacencies.

That observation verifies eigrp stub leaf in a different situation, such as when a remote branch does not transit traffic yet its router receives network-wide EIGRP query requests for unrelated destinations. For the reported eigrp passive-interface incident at a logistics WAN in Rotterdam, the required acceptance evidence is: Hello exchanges resume on the routing link without creating unexpected user-LAN adjacencies. This other result does not test that condition directly.

That observation verifies eigrp delay/bandwidth metric in a different situation, such as when an interface's documented bandwidth differs from its configured EIGRP bandwidth and delay inputs, creating unexpected path costs. For the reported eigrp passive-interface incident at a logistics WAN in Rotterdam, the required acceptance evidence is: Hello exchanges resume on the routing link without creating unexpected user-LAN adjacencies. This other result does not test that condition directly.

That observation verifies eigrp named mode af-interface in a different situation, such as when a named EIGRP configuration has the correct AS but an interface is not participating in its address family. For the reported eigrp passive-interface incident at a logistics WAN in Rotterdam, the required acceptance evidence is: Hello exchanges resume on the routing link without creating unexpected user-LAN adjacencies. This other result does not test that condition directly.