Question 620 An IOS DHCP server offers addresses already allocated to statically configured printers, causing address conflicts. Which lasting design or operational safeguard best prevents this particular issue from recurring? Validate all DHCP option values against the VLAN addressing plan before activation. Include relay address and interface inventory in VLAN turn-up checklists. Pair DHCP relay configuration with firewall-path validation in remote-site templates. Keep a synchronized address-reservation inventory and DHCP exclusion policy. ExplanationCorrect Answer D:Keep a synchronized address-reservation inventory and DHCP exclusion policy. This addresses the recurring cause: IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. A targeted acceptance check is: Review new leases and conflict logs to show printers remain stable and clients get unreserved addresses. Other Answers A:Validate all DHCP option values against the VLAN addressing plan before activation. IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. B:Include relay address and interface inventory in VLAN turn-up checklists. IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. C:Pair DHCP relay configuration with firewall-path validation in remote-site templates. IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved.
Question 621 A branch router forwards DHCP requests to a centralized server, but a security ACL blocks responses from the relay route. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Trace and permit the approved DHCP relay client/server UDP exchange through the actual security path. Correct the subnet-specific DHCP default-router option in the affected pool. Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. Investigate conflicting static assignments and address-conflict detection before expanding the pool. ExplanationCorrect Answer A:Trace and permit the approved DHCP relay client/server UDP exchange through the actual security path. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. Capture discover/offer/ack across relay and ACL counters with an authorized test client. Other Answers B:Correct the subnet-specific DHCP default-router option in the affected pool. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. C:Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. D:Investigate conflicting static assignments and address-conflict detection before expanding the pool. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability.
Question 622 A branch router forwards DHCP requests to a centralized server, but a security ACL blocks responses from the relay route. Which technical mechanism best explains the behavior observed in this scenario? DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. A valid DHCP address lease can still break connectivity if the configured router option is wrong. A DHCPv4 relay's gateway address identifies the client subnet to the server in ordinary relay operation. ExplanationCorrect Answer B:DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. This explains why the initial condition produces the observed failure. The direct repair is: Trace and permit the approved DHCP relay client/server UDP exchange through the actual security path. Validate through: Capture discover/offer/ack across relay and ACL counters with an authorized test client. Other Answers A:DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. C:A valid DHCP address lease can still break connectivity if the configured router option is wrong. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. D:A DHCPv4 relay's gateway address identifies the client subnet to the server in ordinary relay operation. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability.
Question 623 A branch router forwards DHCP requests to a centralized server, but a security ACL blocks responses from the relay route. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Renew a client lease and verify a relayed discover/offer exchange and correct gateway option. Resolve duplicate use and confirm clean offers, ACKs and absence of further conflict events. Capture discover/offer/ack across relay and ACL counters with an authorized test client. Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. ExplanationCorrect Answer C:Capture discover/offer/ack across relay and ACL counters with an authorized test client. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. Other Answers A:Renew a client lease and verify a relayed discover/offer exchange and correct gateway option. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. B:Resolve duplicate use and confirm clean offers, ACKs and absence of further conflict events. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. D:Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability.
Question 624 A branch router forwards DHCP requests to a centralized server, but a security ACL blocks responses from the relay route. Which lasting design or operational safeguard best prevents this particular issue from recurring? Test RA flags and DHCPv6 relay together when deploying stateful IPv6 addressing. Validate relay gateway identity whenever routed client interfaces migrate. Document SLAAC-versus-DHCPv6 behavior by OS and validate RA settings after VLAN changes. Pair DHCP relay configuration with firewall-path validation in remote-site templates. ExplanationCorrect Answer D:Pair DHCP relay configuration with firewall-path validation in remote-site templates. This addresses the recurring cause: DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. A targeted acceptance check is: Capture discover/offer/ack across relay and ACL counters with an authorized test client. Other Answers A:Test RA flags and DHCPv6 relay together when deploying stateful IPv6 addressing. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. B:Validate relay gateway identity whenever routed client interfaces migrate. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. C:Document SLAAC-versus-DHCPv6 behavior by OS and validate RA settings after VLAN changes. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability.
Question 625 IPv6 clients receive link-local addresses but cannot obtain managed IPv6 configuration because the DHCPv6 server is on a remote segment without relay support. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. Adjust the RA managed/other-config signaling to match the approved address-assignment design. Correct the subnet-specific DHCP default-router option in the affected pool. Exclude the reserved printer address range or define proper reservations and check conflict records. ExplanationCorrect Answer A:Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. Other Answers B:Adjust the RA managed/other-config signaling to match the approved address-assignment design. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. C:Correct the subnet-specific DHCP default-router option in the affected pool. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. D:Exclude the reserved printer address range or define proper reservations and check conflict records. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present.
Question 626 IPv6 clients receive link-local addresses but cannot obtain managed IPv6 configuration because the DHCPv6 server is on a remote segment without relay support. Which technical mechanism best explains the behavior observed in this scenario? IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. A valid DHCP address lease can still break connectivity if the configured router option is wrong. DHCP decline or conflict handling indicates offered addresses may already be in use, not simply insufficient pool size. ExplanationCorrect Answer B:DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. This explains why the initial condition produces the observed failure. The direct repair is: Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. Validate through: Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. Other Answers A:IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. C:A valid DHCP address lease can still break connectivity if the configured router option is wrong. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. D:DHCP decline or conflict handling indicates offered addresses may already be in use, not simply insufficient pool size. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present.
Question 627 IPv6 clients receive link-local addresses but cannot obtain managed IPv6 configuration because the DHCPv6 server is on a remote segment without relay support. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Renew a lease and inspect offered router/DNS options and actual off-subnet reachability. Review new leases and conflict logs to show printers remain stable and clients get unreserved addresses. Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. Resolve duplicate use and confirm clean offers, ACKs and absence of further conflict events. ExplanationCorrect Answer C:Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. Other Answers A:Renew a lease and inspect offered router/DNS options and actual off-subnet reachability. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. B:Review new leases and conflict logs to show printers remain stable and clients get unreserved addresses. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. D:Resolve duplicate use and confirm clean offers, ACKs and absence of further conflict events. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present.
Question 628 IPv6 clients receive link-local addresses but cannot obtain managed IPv6 configuration because the DHCPv6 server is on a remote segment without relay support. Which lasting design or operational safeguard best prevents this particular issue from recurring? Validate relay gateway identity whenever routed client interfaces migrate. Include relay address and interface inventory in VLAN turn-up checklists. Monitor DHCP conflicts and enforce centralized IP address ownership. Test RA flags and DHCPv6 relay together when deploying stateful IPv6 addressing. ExplanationCorrect Answer D:Test RA flags and DHCPv6 relay together when deploying stateful IPv6 addressing. This addresses the recurring cause: DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. A targeted acceptance check is: Observe the DHCPv6 relay-forward and relay-reply exchange and a valid client configuration. Other Answers A:Validate relay gateway identity whenever routed client interfaces migrate. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. B:Include relay address and interface inventory in VLAN turn-up checklists. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present. C:Monitor DHCP conflicts and enforce centralized IP address ownership. DHCPv6 client-server messages require an IPv6 relay across routed segments when no local server is present.
Question 629 A subnet is configured for DHCPv6, yet hosts only autoconfigure SLAAC addresses because router advertisements do not indicate the intended managed-address mode. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Adjust the RA managed/other-config signaling to match the approved address-assignment design. Exclude the reserved printer address range or define proper reservations and check conflict records. Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. Trace and permit the approved DHCP relay client/server UDP exchange through the actual security path. ExplanationCorrect Answer A:Adjust the RA managed/other-config signaling to match the approved address-assignment design. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. Inspect received RA flags and the resulting client DHCPv6 transaction in the target host platform. Other Answers B:Exclude the reserved printer address range or define proper reservations and check conflict records. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. C:Configure the platform-supported DHCPv6 relay destination and applicable interface behavior. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. D:Trace and permit the approved DHCP relay client/server UDP exchange through the actual security path. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments.
Question 630 A subnet is configured for DHCPv6, yet hosts only autoconfigure SLAAC addresses because router advertisements do not indicate the intended managed-address mode. Which technical mechanism best explains the behavior observed in this scenario? IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. IPv4 DHCP broadcast discovery does not normally cross routers without a relay agent. ExplanationCorrect Answer B:IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. This explains why the initial condition produces the observed failure. The direct repair is: Adjust the RA managed/other-config signaling to match the approved address-assignment design. Validate through: Inspect received RA flags and the resulting client DHCPv6 transaction in the target host platform. Other Answers A:IOS DHCP pools can dynamically lease any available address in scope unless excluded or reserved. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. C:DHCP relay converts local broadcast requests to routed server communication, which still needs bidirectional policy reachability. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments. D:IPv4 DHCP broadcast discovery does not normally cross routers without a relay agent. IPv6 hosts interpret RA M/O indicators when deciding to use DHCPv6 for address or other configuration in applicable environments.
