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F5 301b Sample Questions

Question # 1

An LTM device pair is configured for failover and connection mirroring. The LTM devicesare configured with virtual servers for HTTP, HTTPS with SSL offload, and SSH. An eventoccurs that causes a failover. HTTP and SSH sessions active at the time of failover remainactive, but HTTPS sessions are dropped.What is the root cause of this problem?

A. The SSL certificates on the LTM devices do NOT match.
B. Connection mirroring is incompatible with clientssl profiles.
C. SNAT automap was NOT enabled for the HTTPS virtual servers.
D. Connection mirroring was NOT enabled for the HTTPS virtual servers.

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Question # 2

A failover event is recorded in the following log messages:Jan 01 00:56:56 BIG-IP notice mcpd[5318]: 01070727:5: Pool /Common/my-pool member/Common/10.0.0.10:80 monitor status down.Jan 01 00:56:56 BIG-IP notice sod[5855]: 010c0045:5: Leaving active, group score 10 peergroup score 20.Jan 01 00:56:56 BIG-IP notice sod[5855]: 010c0052:5: Standby for traffic group /Common/traffic-group-1.Jan 01 00:56:56 BIG-IP notice sod[5855]: 010c0018:5: StandbyJan 01 00:57:06 BIG-IP notice logger: /usr/bin/tmipsecd --tmmcount 4 ==> /usr/bin/bigstartstop racoonWhat is the cause of the failover?

A. The HA group score changed.
B. No traffic is seen on traffic-group-1.
C. The peer device left the traffic group.
D. The racoon service stopped responding.

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Question # 3

A device group is made up of four members: LTM-A, LTM-B, LTM-C, and LTM-D. An LTMSpecialist makes a configuration change on LTM-B. Later, a different LTM Specialistnotices a "changes pending" message on all devices. When logged into LTM-D, the LTMSpecialist attempts to config-sync to the device group. The sync operation fails.Why is the LTM Specialist on LTM-D unable to synchronize the configuration to the group?

A. The changes made on LTM-B are invalid.
B. LTM-D has the lowest commit-id of the group.
C. NTP is NOT configured on the devices in the group.
D. LTM-B is the device eligible to initiate a config-sync.

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Question # 4

An HA pair of LTM devices configured in Active-Standby mode stops responding to traffic and causes an outage. The Active device becomes Standby, but the partner device stays in Standby mode instead of taking over as Active. A reboot and restart of the services brings the LTM device to Active mode for a short time, but then it goes into Standby mode  again.  Which two configuration components caused this condition? (Choose two.) 

A. VLAN Fail-safe
B. System Fail-safe
C. Gateway Fail-safe
D. Switch Board Failure
E. Link down on Failover

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Question # 5

An LTM Specialist configures two LTM devices in a high-availability pair with trustsestablished and device groups configured properly using network failover. After severalmonths, the LTM Specialist notices that changes made to one LTM device do NOT causethe synchronization status to update to "changes pending," and this device does NOTsynchronize with the device group.Which two steps should the LTM Specialist take to identify the issue? (Choose two.)

A. Verify that NTP is synchronized.
B. Verify the network connectivity between the devices.
C. Verify that the devices are not using self-signed certificates.
D. Verify that ConfigSync is using the management IP address.
E. Verify that port lockdown on the ConfigSync interface is set to allow port 1026.

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Question # 6

An LTM Specialist is troubleshooting an issue where one LTM device in a three LTMdevice group is failing to synchronize after a synchronize to group command is issued. TheLTM Specialist verifies there are no packet filters, port lock down, or network issues preventing the connection.What are two reasons the synchronization group is having issues? (Choose two.)

A. Certificates expired on all of the peer LTM devices.
B. Certificates stored for the device trusts on all of the peer LTM devices are corrupted.
C. Admin passwords changed on one of the peer LTM devices that are able tosynchronize.
D. Admin password changed on the LTM device NOT receiving the synchronizedconfigurations.
E. Certificates stored for the device trusts on the LTM device NOT receiving theconfiguration are corrupted.

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Question # 7

An LTM Specialist has just manually failed the active LTM device over to the standby LTMdevice. The LTM Specialist notices the newly active LTM device is NOT currently receivingtraffic. The LTM Specialist verifies the newly active device is responding to ARP but still notraffic is hitting the virtual servers. The LTM Specialist also notices that the virtual serverseventually start responding.What should be added to the configuration to resolve the problem?

A. vlan failsafe
B. floating self IP
C. network failover
D. MAC masquerading
E. connection mirroring

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Question # 8

A failover event is recorded in the log messages:Jan 01 00:00:50 BIG-IP notice sod[5855]: 01140029:5: HA proc_running tmm fails action isgo offline and down links.Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0050:5: Sod requests links down.Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0054:5: Offline for traffic group/Common/traffic-group-1.Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c003e:5: OfflineJan 01 00:00:50 BIG-IP notice logger: /usr/bin/tmipsecd --tmmcount 4 ==> /usr/bin/bigstartstop racoonJan 01 00:00:50 BIG-IP info lacpd[5502]: 01160016:6: Failover event detected.(Switchboard failsafe disabled while offline)Jan 01 00:00:51 BIG-IP err bcm56xxd[5296]: 012c0010:3: Failover event detected. Markingexternal interfaces down. bsx.c(3633)Jan 01 00:00:51 BIG-IP info bcm56xxd[5296]: 012c0015:6: Link: 1.1 is DOWNJan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143c:5: Connection to CMI peer 10.0.0.3has been removedJan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143a:5: CMI reconnect timer: enabledJan 01 00:00:56 BIG-IP notice mcpd[5318]: 01071431:5: Attempting to connect to CMIpeer 10.0.0.3 port 6699What is the cause of the failover?

A. TMM failed, and VLAN fail-safe initiated the failover.
B. TMM failed, and system fail-safe initiated the failover.
C. Loss of connection to CMI peer 10.0.0.3 initiated the failover.
D. A switchboard failure caused system fail-safe to initiate the failover.

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Question # 9

While investigating the cause of a device failover, an LTM Specialist discovers the followingevents in /var/log/ltm:01010029:5: Clock advanced by 518 ticks01010029:5: Clock advanced by 505 ticks01010029:5: Clock advanced by 590 ticks01010029:5: Clock advanced by 568 ticks01010029:5: Clock advanced by 1681 ticks01010029:5: Clock advanced by 6584 ticks01140029:5: HA daemon_heartbeat tmm fails action is failover and restart.010c0026:5: Failover condition, active attempting to go standby.Which issue caused the failover?

A. NTP being out of sync
B. TMM being descheduled
C. VLAN Fail-safe heartbeats
D. HA missing heartbeat packets

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Question # 10

A high-availability (HA) pair configuration uses only the hardwire serial cable connection todetermine device state. A power outage occurs to the PDU powering the active unit. Thestandby unit takes over the active role as expected.How is the peer unit able to determine the active unit is unavailable?

A. voltage loss on serial cable
B. no data stream received on serial port
C. no response on management interface
D. no heartbeat packets received on self IPs

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Question # 11

In preparation for a maintenance task, an LTM Specialist performs a "Force to Standby" onLTM device Unit 1. LTM device Unit 2 becomes active as expected. The maintenance taskrequires the reboot of Unit 1. Shortly after the reboot is complete, the LTM Specialistdiscovers that Unit 1 has become active and Unit 2 has returned to standby.What would cause this behavior?

A. Unit 1 is set with the redundancy state preference of active in devices groups.
B. Unit 1 is set with the redundancy state preference of active in high availability.
C. A traffic group is configured with Auto Failback, and Unit 1 is the default device.
D. A device group is configured with Auto Failback, and Unit 1 is the default device.

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Question # 12

Given LTM device ltm log:Sep 26 20:51:08 local/lb-d-1 notice promptstatusd[3695]: 01460006:5: semaphoremcpd.running(1) heldSep 26 20:51:08 local/lb-d-1 notice promptstatusd[3695]: 01460006:5:Sep 26 20:51:08 local/lb-d-1 warning promptstatusd[3695]: 01460005:4: mcpd.running(1)held, wait for mcpdSep 26 20:51:08 local/lb-d-1 info sod[3925]: 010c0009:6: Lost connection to mcpd -reestablishing.Sep 26 20:51:08 local/lb-d-1 err bcm56xxd[3847]: 012c0004:3: Lost connection with MCP:16908291 ... Exiting bsx_connect.cpp(174)Sep 26 20:51:08 local/lb-d-1 info bcm56xxd[3847]: 012c0012:6: MCP Exit StatusSep 26 20:51:08 local/lb-d-1 info bcm56xxd[3847]: 012c0012:6: Info: LACP stats (timenow:1348717868) : no trafficSep 26 20:51:08 local/lb-d-1 info bcm56xxd[3847]: 012c0014:6: Exiting...Sep 26 20:51:08 local/lb-d-1 err lind[3842]: 013c0004:3: IO error on recv from mcpd -connection lostSep 26 20:51:08 local/lb-d-1 notice bigd[3837]: 01060110:5: Lost connection to mcpd witherror 16908291, will reinit connection.Sep 26 20:51:08 local/lb-d-1 err statsd[3857]: 011b0004:3: Initial subscription for systemconfiguration failed with error ''Sep 26 20:51:08 local/lb-d-1 err statsd[3857]: 011b0001:3: Connection to mcpd failed witherror '011b0004:3: Initial subscription for system configuration failed with error '''Sep 26 20:51:08 local/lb-d-1 err csyncd[3851]: 013b0004:3: IO error on recv from mcpd -connection lost.............skipping more logs.....Sep 26 20:51:30 local/lb-d-1 notice sod[3925]: 01140030:5: HA proc_running bcm56xxd isnow responding.Sep 26 20:51:34 local/lb-d-1 notice sod[3925]: 01140030:5: HA proc_running mcpd is nowresponding.Sep 26 20:51:34 local/lb-d-1 notice sod[3925]: 010c0018:5: StandbyWhich daemon failed?

A. promptstatusd
B. mcpd
C. sod
D. bcm56xxd
E. lind

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Question # 13

An active/standby pair of LTM devices deployed with network failover are working asdesired. After external personnel perform maintenance on the network, the LTM devicesare active/active rather than active/standby. No changes were made on the LTM devicesduring the network maintenance.Which two actions would help determine the cause of the malfunction? (Choose two.)

A. checking that the configurations are synchronized
B. checking the configuration of the VLAN used for failover
C. checking the configuration of the VLAN used for mirroring
D. checking the open ports in firewalls between the LTM devices
E. checking synchronization of system clocks among the network devices

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