Exam Bundle

That observation verifies snmpv3 engine id mismatch in a different situation, such as when sNMPv3 credentials stop working after a device engine ID changes while old localized keys remain. For the reported snmpv3 algorithm mismatch incident at a medical campus infrastructure team in Raleigh, the required acceptance evidence is: SNMPv3 get operations succeed without downgrading required confidentiality. This other result does not test that condition directly.

That observation verifies snmpv2c community mismatch in a different situation, such as when an NMS times out polling an SNMPv2c device after the configured community string was changed. For the reported snmpv3 algorithm mismatch incident at a medical campus infrastructure team in Raleigh, the required acceptance evidence is: SNMPv3 get operations succeed without downgrading required confidentiality. This other result does not test that condition directly.

That observation verifies snmp community privilege scope in a different situation, such as when a polling-only monitoring system receives excessive SNMP write capability from a read-write community. For the reported snmpv3 algorithm mismatch incident at a medical campus infrastructure team in Raleigh, the required acceptance evidence is: SNMPv3 get operations succeed without downgrading required confidentiality. This other result does not test that condition directly.

That approach is relevant to ipv6 nd spoofing, such as when an attacker injects forged Neighbor Advertisements to redirect local IPv6 traffic. That is a different root cause from the ipv6 rogue router advertisements fault observed at a multi-tenant facility in Dublin. Applying that approach alone would not establish the required result: Unauthorized RA frames are blocked and hosts retain the intended IPv6 default router.

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 ipv6 rogue router advertisements fault observed at a multi-tenant facility in Dublin. Applying that approach alone would not establish the required result: Unauthorized RA frames are blocked and hosts retain the intended IPv6 default router.

That approach is relevant to ra guard trusted boundary, such as when rA Guard is deployed only on the legitimate router-facing port instead of the untrusted host-facing ports. That is a different root cause from the ipv6 rogue router advertisements fault observed at a multi-tenant facility in Dublin. Applying that approach alone would not establish the required result: Unauthorized RA frames are blocked and hosts retain the intended IPv6 default router.

That observation verifies ra guard trusted boundary in a different situation, such as when rA Guard is deployed only on the legitimate router-facing port instead of the untrusted host-facing ports. For the reported ipv6 rogue router advertisements incident at a multi-tenant facility in Dublin, the required acceptance evidence is: Unauthorized RA frames are blocked and hosts retain the intended IPv6 default router. This other result does not test that condition directly.

That observation verifies ipv6 source guard in a different situation, such as when a client spoofs an IPv6 source address not associated with its access port and evades ordinary destination filtering. For the reported ipv6 rogue router advertisements incident at a multi-tenant facility in Dublin, the required acceptance evidence is: Unauthorized RA frames are blocked and hosts retain the intended IPv6 default router. This other result does not test that condition directly.

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 ipv6 rogue router advertisements incident at a multi-tenant facility in Dublin, the required acceptance evidence is: Unauthorized RA frames are blocked and hosts retain the intended IPv6 default router. 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 bgp rib failure fault observed at a retail network core in Chicago. Applying that approach alone would not establish the required result: The observed RIB-failure reason is resolved or documented without mislabeling the BGP session as down.

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 bgp rib failure fault observed at a retail network core in Chicago. Applying that approach alone would not establish the required result: The observed RIB-failure reason is resolved or documented without mislabeling the BGP session as down.

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 bgp rib failure fault observed at a retail network core in Chicago. Applying that approach alone would not establish the required result: The observed RIB-failure reason is resolved or documented without mislabeling the BGP session as down.

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 rib failure incident at a retail network core in Chicago, the required acceptance evidence is: The observed RIB-failure reason is resolved or documented without mislabeling the BGP session as down. 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 bgp rib failure incident at a retail network core in Chicago, the required acceptance evidence is: The observed RIB-failure reason is resolved or documented without mislabeling the BGP session as down. 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 bgp rib failure incident at a retail network core in Chicago, the required acceptance evidence is: The observed RIB-failure reason is resolved or documented without mislabeling the BGP session as down. This other result does not test that condition directly.

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 corporate IT backbone in Chicago. 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 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 corporate IT backbone in Chicago. 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 corporate IT backbone in Chicago. 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 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 corporate IT backbone in Chicago, 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 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 corporate IT backbone in Chicago, 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 corporate IT backbone in Chicago, 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 airline WAN in London. 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 airline WAN in London. 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 airline WAN in London. 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 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 airline WAN in London, 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 airline WAN in London, 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 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 airline WAN in London, 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 aaa accounting records, such as when management logins succeed but the audit system has no connection or command records. That is a different root cause from the tacacs+ transport port fault observed at a regional data center in Dallas. Applying that approach alone would not establish the required result: The router establishes a TCP session to TACACS+ and login requests are answered.

That approach is relevant to tacacs secret mismatch, such as when tACACS requests reach the identity server but packets cannot be validated because server and device share different secrets. That is a different root cause from the tacacs+ transport port fault observed at a regional data center in Dallas. Applying that approach alone would not establish the required result: The router establishes a TCP session to TACACS+ and login requests are answered.

That approach is relevant to aaa server unavailable versus reject, such as when a router is configured TACACS+ then local, but an explicit reject from the active TACACS+ server is expected to trigger local fallback. That is a different root cause from the tacacs+ transport port fault observed at a regional data center in Dallas. Applying that approach alone would not establish the required result: The router establishes a TCP session to TACACS+ and login requests are answered.

That observation verifies tacacs secret mismatch in a different situation, such as when tACACS requests reach the identity server but packets cannot be validated because server and device share different secrets. For the reported tacacs+ transport port incident at a regional data center in Dallas, the required acceptance evidence is: The router establishes a TCP session to TACACS+ and login requests are answered. This other result does not test that condition directly.

That observation verifies aaa server unavailable versus reject in a different situation, such as when a router is configured TACACS+ then local, but an explicit reject from the active TACACS+ server is expected to trigger local fallback. For the reported tacacs+ transport port incident at a regional data center in Dallas, the required acceptance evidence is: The router establishes a TCP session to TACACS+ and login requests are answered. This other result does not test that condition directly.

That observation verifies aaa login authentication omitted in a different situation, such as when remote access fails after AAA configuration because no supported authentication method list is bound to the relevant VTY lines. For the reported tacacs+ transport port incident at a regional data center in Dallas, the required acceptance evidence is: The router establishes a TCP session to TACACS+ and login requests are answered. This other result does not test that condition directly.