Exam Bundle

That observation verifies extended acl ports in a different situation, such as when an ACL permits a destination address but not the required TCP application port because the entry tests the wrong transport field. For the reported tcp established acl meaning incident at a telecommunications branch in Oslo, the required acceptance evidence is: The design does not claim true session state from an ACK/RST flag match alone. This other result does not test that condition directly.

That observation verifies urpf loose reachability in a different situation, such as when loose uRPF is installed on an edge and administrators assume it verifies incoming interface symmetry. For the reported tcp established acl meaning incident at a telecommunications branch in Oslo, the required acceptance evidence is: The design does not claim true session state from an ACK/RST flag match alone. This other result does not test that condition directly.

That observation verifies acl applied wrong direction in a different situation, such as when an extended IPv4 ACL correctly describes unwanted inbound traffic but was attached outbound on the wrong router interface. For the reported tcp established acl meaning incident at a telecommunications branch in Oslo, the required acceptance evidence is: The design does not claim true session state from an ACK/RST flag match alone. This other result does not test that condition directly.

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 pbr local generated packets fault observed at a hospital enterprise WAN in Melbourne. Applying that approach alone would not establish the required result: Router-originated probes follow the designated policy without changing unrelated transit traffic.

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 pbr local generated packets fault observed at a hospital enterprise WAN in Melbourne. Applying that approach alone would not establish the required result: Router-originated probes follow the designated policy without changing unrelated transit traffic.

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 pbr local generated packets fault observed at a hospital enterprise WAN in Melbourne. Applying that approach alone would not establish the required result: Router-originated probes follow the designated policy without changing unrelated transit traffic.

That observation verifies ospf cost path choice in a different situation, such as when an engineer expects OSPF to choose the highest interface speed but configured interface cost forces a different path. For the reported pbr local generated packets incident at a hospital enterprise WAN in Melbourne, the required acceptance evidence is: Router-originated probes follow the designated policy without changing unrelated transit traffic. This other result does not test that condition directly.

That observation verifies connected route redistribution oversight in a different situation, such as when an attached transit network is mistakenly redistributed into an IGP intended only to carry service prefixes. For the reported pbr local generated packets incident at a hospital enterprise WAN in Melbourne, the required acceptance evidence is: Router-originated probes follow the designated policy without changing unrelated transit traffic. This other result does not test that condition directly.

That observation verifies redistribution route-map omission in a different situation, such as when a router leaks sensitive static prefixes into OSPF because redistribute static has no route policy. For the reported pbr local generated packets incident at a hospital enterprise WAN in Melbourne, the required acceptance evidence is: Router-originated probes follow the designated policy without changing unrelated transit traffic. This other result does not test that condition directly.

That approach is relevant to dhcp relay udp filtering, such as when router helpers are correctly configured but remote clients time out because DHCP request/response UDP transport is blocked between relay and server. That is a different root cause from the dhcp relay helper address fault observed at a logistics campus in Rotterdam. Applying that approach alone would not establish the required result: The relay forwards client requests and remote hosts receive valid leased addresses.

That approach is relevant to dhcp default router option, 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. That is a different root cause from the dhcp relay helper address fault observed at a logistics campus in Rotterdam. Applying that approach alone would not establish the required result: The relay forwards client requests and remote hosts receive valid leased addresses.

That approach is relevant to dhcp duplicate leased ip, such as when the DHCP server offers an IPv4 address already in use and hosts report duplicate-address alerts. That is a different root cause from the dhcp relay helper address fault observed at a logistics campus in Rotterdam. Applying that approach alone would not establish the required result: The relay forwards client requests and remote hosts receive valid leased addresses.

That observation verifies dhcp relay udp filtering in a different situation, such as when router helpers are correctly configured but remote clients time out because DHCP request/response UDP transport is blocked between relay and server. For the reported dhcp relay helper address incident at a logistics campus in Rotterdam, the required acceptance evidence is: The relay forwards client requests and remote hosts receive valid leased addresses. This other result does not test that condition directly.

That observation verifies dhcpv6 relay missing in a different situation, such as when iPv6 clients on a remote link cannot contact the centralized stateful DHCPv6 server through their local router. For the reported dhcp relay helper address incident at a logistics campus in Rotterdam, the required acceptance evidence is: The relay forwards client requests and remote hosts receive valid leased addresses. This other result does not test that condition directly.

That observation verifies dhcp giaddr subnet selection in a different situation, such as when a central DHCP server selects the wrong scope for remote clients because the relay's gateway address is unexpected. For the reported dhcp relay helper address incident at a logistics campus in Rotterdam, the required acceptance evidence is: The relay forwards client requests and remote hosts receive valid leased addresses. This other result does not test that condition directly.

That approach is relevant to provider core label loss, such as when core IGP routes are stable but the ingress PE has no remote label for the required egress PE FEC. That is a different root cause from the local versus remote labels fault observed at an energy services network in Calgary. Applying that approach alone would not establish the required result: Incoming labels resolve via local bindings and outbound labels follow the neighbor's advertisement.

That approach is relevant to mpls label swapping, such as when a core operator assumes each transit router forwards solely on the customer destination IP rather than the incoming MPLS label. That is a different root cause from the local versus remote labels fault observed at an energy services network in Calgary. Applying that approach alone would not establish the required result: Incoming labels resolve via local bindings and outbound labels follow the neighbor's advertisement.

That approach is relevant to mpls interface activation, such as when an IGP core forwards ordinary IP packets but labeled traffic fails because MPLS forwarding is absent on a core-facing interface. That is a different root cause from the local versus remote labels fault observed at an energy services network in Calgary. Applying that approach alone would not establish the required result: Incoming labels resolve via local bindings and outbound labels follow the neighbor's advertisement.

That observation verifies ldp discovery versus adjacency in a different situation, such as when uDP-based LDP link discovery is observed, but the engineer assumes label exchange is healthy without verifying the TCP session. For the reported local versus remote labels incident at an energy services network in Calgary, the required acceptance evidence is: Incoming labels resolve via local bindings and outbound labels follow the neighbor's advertisement. This other result does not test that condition directly.

That observation verifies provider core label loss in a different situation, such as when core IGP routes are stable but the ingress PE has no remote label for the required egress PE FEC. For the reported local versus remote labels incident at an energy services network in Calgary, the required acceptance evidence is: Incoming labels resolve via local bindings and outbound labels follow the neighbor's advertisement. This other result does not test that condition directly.

That observation verifies ldp session transport reachability in a different situation, such as when two MPLS core routers discover LDP neighbors yet cannot maintain the TCP session because their chosen LDP transport addresses are unreachable. For the reported local versus remote labels incident at an energy services network in Calgary, the required acceptance evidence is: Incoming labels resolve via local bindings and outbound labels follow the neighbor's advertisement. 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 regional data center in Dallas. 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 regional data center in Dallas. 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 regional data center in Dallas. 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 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 regional data center in Dallas, 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 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 regional data center in Dallas, 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 regional data center in Dallas, 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 ebgp nonconnected loopback, such as when bGP TCP connectivity over loopbacks fails because a multihop eBGP peer relies on a default one-hop TTL. That is a different root cause from the ibgp next-hop preservation fault observed at a bank network operations team in London. Applying that approach alone would not establish the required result: The iBGP route has a reachable next hop and is eligible for RIB installation.

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 ibgp next-hop preservation fault observed at a bank network operations team in London. Applying that approach alone would not establish the required result: The iBGP route has a reachable next hop and is eligible for RIB installation.

That approach is relevant to as path prepending inbound control, such as when traffic from external networks enters via the undesired backup link even though local preference was changed only inside the enterprise. That is a different root cause from the ibgp next-hop preservation fault observed at a bank network operations team in London. Applying that approach alone would not establish the required result: The iBGP route has a reachable next hop and is eligible for RIB installation.

That observation verifies route reflector ibgp split horizon in a different situation, such as when an iBGP speaker learns a route from another iBGP peer but does not advertise it to a third peer because normal iBGP split-horizon rules apply. For the reported ibgp next-hop preservation incident at a bank network operations team in London, the required acceptance evidence is: The iBGP route has a reachable next hop and is eligible for RIB installation. 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 ibgp next-hop preservation incident at a bank network operations team in London, the required acceptance evidence is: The iBGP route has a reachable next hop and is eligible for RIB installation. 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 ibgp next-hop preservation incident at a bank network operations team in London, the required acceptance evidence is: The iBGP route has a reachable next hop and is eligible for RIB installation. This other result does not test that condition directly.