Exam Bundle

That observation verifies bgp rib failure in a different situation, such as when a prefix is visible as valid and best in BGP but cannot install into the RIB because another protocol has a preferable route. For the reported bgp address family activation incident at an enterprise WAN hub in Singapore, the required acceptance evidence is: IPv6 route counters increase and approved IPv6 NLRI is learned. This other result does not test that condition directly.

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 bgp address family activation incident at an enterprise WAN hub in Singapore, the required acceptance evidence is: IPv6 route counters increase and approved IPv6 NLRI is learned. This other result does not test that condition directly.

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 bgp address family activation incident at an enterprise WAN hub in Singapore, the required acceptance evidence is: IPv6 route counters increase and approved IPv6 NLRI is learned. This other result does not test that condition directly.

That approach is relevant to dhcpv6 rogue server, such as when a malicious access client sends DHCPv6 server responses that assign incorrect network parameters to hosts. That is a different root cause from the ra guard trusted boundary fault observed at a service provider support center in Paris. Applying that approach alone would not establish the required result: Legitimate RAs reach clients while rogue access-host advertisements are blocked.

That approach is relevant to ipv6 rogue router advertisements, such as when an untrusted access port sends IPv6 Router Advertisements and changes hosts' default gateway. That is a different root cause from the ra guard trusted boundary fault observed at a service provider support center in Paris. Applying that approach alone would not establish the required result: Legitimate RAs reach clients while rogue access-host advertisements are blocked.

That approach is relevant to ipv6 source guard, such as when a client spoofs an IPv6 source address not associated with its access port and evades ordinary destination filtering. That is a different root cause from the ra guard trusted boundary fault observed at a service provider support center in Paris. Applying that approach alone would not establish the required result: Legitimate RAs reach clients while rogue access-host advertisements are blocked.

That observation verifies ipv6 nd trust validation in a different situation, such as when a first-hop protection policy is copied from a different VLAN and treats all access ports as trusted for neighbor discovery. For the reported ra guard trusted boundary incident at a service provider support center in Paris, the required acceptance evidence is: Legitimate RAs reach clients while rogue access-host advertisements are blocked. This other result does not test that condition directly.

That observation verifies ipv6 rogue router advertisements in a different situation, such as when an untrusted access port sends IPv6 Router Advertisements and changes hosts' default gateway. For the reported ra guard trusted boundary incident at a service provider support center in Paris, the required acceptance evidence is: Legitimate RAs reach clients while rogue access-host advertisements are blocked. This other result does not test that condition directly.

That observation verifies dhcpv6 rogue server in a different situation, such as when a malicious access client sends DHCPv6 server responses that assign incorrect network parameters to hosts. For the reported ra guard trusted boundary incident at a service provider support center in Paris, the required acceptance evidence is: Legitimate RAs reach clients while rogue access-host advertisements are blocked. This other result does not test that condition directly.

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 default router option fault observed at a medical campus infrastructure team in Raleigh. Applying that approach alone would not establish the required result: Client leases contain the intended gateway and clients reach off-subnet destinations.

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 default router option fault observed at a medical campus infrastructure team in Raleigh. Applying that approach alone would not establish the required result: Client leases contain the intended gateway and clients reach off-subnet destinations.

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 default router option fault observed at a medical campus infrastructure team in Raleigh. Applying that approach alone would not establish the required result: Client leases contain the intended gateway and clients reach off-subnet destinations.

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 default router option incident at a medical campus infrastructure team in Raleigh, the required acceptance evidence is: Client leases contain the intended gateway and clients reach off-subnet destinations. This other result does not test that condition directly.

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 default router option incident at a medical campus infrastructure team in Raleigh, the required acceptance evidence is: Client leases contain the intended gateway and clients reach off-subnet destinations. This other result does not test that condition directly.

That observation verifies dhcpv6 duid identity in a different situation, such as when an administrator assumes DHCPv6 reservations use only a client MAC address and the intended client consistently misses its reserved lease. For the reported dhcp default router option incident at a medical campus infrastructure team in Raleigh, the required acceptance evidence is: Client leases contain the intended gateway and clients reach off-subnet destinations. This other result does not test that condition directly.

That approach is relevant to ospf dr bdr network type, such as when a point-to-point link is configured with an OSPF broadcast network type and displays an unnecessary DR election. That is a different root cause from the ospf virtual link transit fault observed at a government WAN in Ottawa. Applying that approach alone would not establish the required result: The virtual link reaches Full and restores intended logical backbone connectivity.

That approach is relevant to ospf stub flag mismatch, such as when an OSPF adjacency fails because one side is configured stub and the other side treats the area as normal. That is a different root cause from the ospf virtual link transit fault observed at a government WAN in Ottawa. Applying that approach alone would not establish the required result: The virtual link reaches Full and restores intended logical backbone connectivity.

That approach is relevant to ospf area mismatch, such as when two OSPF routers on one link receive hellos but use different area identifiers, preventing adjacency. That is a different root cause from the ospf virtual link transit fault observed at a government WAN in Ottawa. Applying that approach alone would not establish the required result: The virtual link reaches Full and restores intended logical backbone connectivity.

That observation verifies ospf area mismatch in a different situation, such as when two OSPF routers on one link receive hellos but use different area identifiers, preventing adjacency. For the reported ospf virtual link transit incident at a government WAN in Ottawa, the required acceptance evidence is: The virtual link reaches Full and restores intended logical backbone connectivity. This other result does not test that condition directly.

That observation verifies ospf dr bdr network type in a different situation, such as when a point-to-point link is configured with an OSPF broadcast network type and displays an unnecessary DR election. For the reported ospf virtual link transit incident at a government WAN in Ottawa, the required acceptance evidence is: The virtual link reaches Full and restores intended logical backbone connectivity. This other result does not test that condition directly.

That observation verifies ospf exstart mtu in a different situation, such as when oSPF neighbors get stuck in Exstart/Exchange and database description packets advertise incompatible MTUs. For the reported ospf virtual link transit incident at a government WAN in Ottawa, the required acceptance evidence is: The virtual link reaches Full and restores intended logical backbone connectivity. This other result does not test that condition directly.

That approach is relevant to dmvpn peer-state cli, such as when tunnel interfaces show up/up but the team has not checked whether NHRP peers are registered and active. That is a different root cause from the dmvpn tunnel key inconsistency fault observed at an MPLS service provider in Paris. Applying that approach alone would not establish the required result: Tunnel encapsulation is accepted consistently and expected peer packets pass.

That approach is relevant to tunnel ipsec profile binding, such as when spoke-to-hub GRE packets are being sent without the required encryption because no tunnel protection profile is attached. That is a different root cause from the dmvpn tunnel key inconsistency fault observed at an MPLS service provider in Paris. Applying that approach alone would not establish the required result: Tunnel encapsulation is accepted consistently and expected peer packets pass.

That approach is relevant to dmvpn mgre hub, such as when a single-hub DMVPN must support many dynamically registered spokes, but the hub tunnel is configured as a fixed point-to-point GRE tunnel. That is a different root cause from the dmvpn tunnel key inconsistency fault observed at an MPLS service provider in Paris. Applying that approach alone would not establish the required result: Tunnel encapsulation is accepted consistently and expected peer packets pass.

That observation verifies eigrp dmvpn peer issue in a different situation, such as when dMVPN peers have protected tunnel reachability but EIGRP never forms because routing is not active on tunnel interfaces. For the reported dmvpn tunnel key inconsistency incident at an MPLS service provider in Paris, the required acceptance evidence is: Tunnel encapsulation is accepted consistently and expected peer packets pass. This other result does not test that condition directly.

That observation verifies dmvpn peer-state cli in a different situation, such as when tunnel interfaces show up/up but the team has not checked whether NHRP peers are registered and active. For the reported dmvpn tunnel key inconsistency incident at an MPLS service provider in Paris, the required acceptance evidence is: Tunnel encapsulation is accepted consistently and expected peer packets pass. This other result does not test that condition directly.

That observation verifies nhrp cache verification in a different situation, such as when a direct spoke route exists but its tunnel next hop lacks a corresponding NHRP resolution entry. For the reported dmvpn tunnel key inconsistency incident at an MPLS service provider in Paris, the required acceptance evidence is: Tunnel encapsulation is accepted consistently and expected peer packets pass. This other result does not test that condition directly.

That approach is relevant to syslog transport acl, such as when local logs are correct but the central UDP syslog collector never sees packets due to the WAN filtering policy. That is a different root cause from the logging buffer too small fault observed at a regional network operations center in Bristol. Applying that approach alone would not establish the required result: Incident events are retained long enough for diagnosis and archived centrally.

That approach is relevant to syslog severity threshold, such as when informational interface events never reach syslog because the configured logging trap level captures only severe messages. That is a different root cause from the logging buffer too small fault observed at a regional network operations center in Bristol. Applying that approach alone would not establish the required result: Incident events are retained long enough for diagnosis and archived centrally.

That approach is relevant to syslog remote destination, such as when a router logs events locally but nothing reaches the central collector because logging host was never configured. That is a different root cause from the logging buffer too small fault observed at a regional network operations center in Bristol. Applying that approach alone would not establish the required result: Incident events are retained long enough for diagnosis and archived centrally.

That observation verifies syslog remote destination in a different situation, such as when a router logs events locally but nothing reaches the central collector because logging host was never configured. For the reported logging buffer too small incident at a regional network operations center in Bristol, the required acceptance evidence is: Incident events are retained long enough for diagnosis and archived centrally. This other result does not test that condition directly.

That observation verifies log timestamps absent in a different situation, such as when two routers' syslog events cannot be ordered during a reconvergence incident because device log messages have no accurate timestamps. For the reported logging buffer too small incident at a regional network operations center in Bristol, the required acceptance evidence is: Incident events are retained long enough for diagnosis and archived centrally. This other result does not test that condition directly.

That observation verifies syslog severity threshold in a different situation, such as when informational interface events never reach syslog because the configured logging trap level captures only severe messages. For the reported logging buffer too small incident at a regional network operations center in Bristol, the required acceptance evidence is: Incident events are retained long enough for diagnosis and archived centrally. This other result does not test that condition directly.