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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting and Support | 25% | - Common troubleshooting scenarios - iRules debugging - SNMP and monitoring - Performance and resource monitoring - tcpdump and network capture - Logging and log configuration |
| Security and Access | 10% | - User authentication (Remote Auth, LDAP, RADIUS) - SSL/TLS configuration - Packet filtering - Role-based access control (RBAC) |
| Local Traffic Management (LTM) | 30% | - SSL profiles and offloading - Health monitors and monitory types - Pools and pool members - Virtual servers (Standard, Performance L4, Forwarding) - iRules and persistence profiles - Load balancing modes |
| Architecture and Components | 15% | - High availability (HA) configurations - Traffic flow and packet processing - Device service clustering (DSC) - BIG-IP system architecture |
| Initial Setup and Configuration | 20% | - Network failover setup - Network configuration (VLANs, Self IPs, Routes) - User management and role-based access - NTP and DNS configuration - Initial provisioning (Provisioning, License) |
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NEW QUESTION # 81
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?
Answer: B
Explanation:
When traffic "stabilizes after a few minutes" following a failover, it points to a network-level performance issue involving ARP cache on upstream routers and switches. Each BIG-IP interface has a unique hardware MAC address. During failover, the Standby device takes over the floating IP address, but the upstream switch still associates that IP with the MAC of the now-offline device. Traffic is lost until the switch learns the new MAC or its ARP entry expires. "MAC Masquerading" solves this by creating a shared, virtual MAC address for the floating traffic group. This virtual MAC is used by whichever device is currently active. Because the MAC address for the virtual server IP never changes from the perspective of the network, the upstream devices do not need to update their ARP tables. This troubleshooting solution eliminates the delay associated with failover, providing a seamless transition and ensuring that application traffic flow is not disrupted when the BIG-IP HA state changes.
NEW QUESTION # 82
Refer to the exhibit.
The BIG-IP Administrator has modified an iRule on one device of an HA pair. The BIG-IP Administrator notices there is NO traffic on the BIG-IP device in which they are logged into. What should the BIG-IP Administrator do to verify if the iRule works correctly?
Answer: B
Explanation:
Based on the provided exhibits, the BIG-IP device is currently in a Standby state ("ONLINE (STANDBY)") and has a sync status of "Changes Pending" (Yellow icon).
* Understanding Device State and Traffic: In an Active/Standby High Availability (HA) pair, traffic is processed by the Active device. The exhibit confirms the administrator is logged into the Standby device, which explains why there is "NO traffic" currently observed on this specific unit.
* Configuration Synchronization (ConfigSync): When an administrator modifies a local object, such as an iRule, on one member of a device group, the changes must be synchronized to the other members to ensure consistency. The "Changes Pending" status indicates that the local configuration on this device is newer than the configuration on other group members.
* Push vs. Pull: * Push: Sends the configuration from the current device to the other members of the device group.
* Pull: Overwrites the current device's configuration with the configuration from another member of the group.
* Resolving the Scenario: Since the administrator modified the iRule on "this device," they must Push the configuration to the group so the Active device receives the updated iRule. To verify the iRule works, the administrator can then monitor the traffic on the Active device or initiate a manual failover to make "this device" Active, allowing it to process traffic with the new iRule.
Option D is the correct administrative workflow: synchronize the changes to the group (Push) and then monitor the traffic flow to validate the new logic.
NEW QUESTION # 83
A BIG-IP device sends out the following SNMP trap:
big-ipo.f5.com - bigipExternalLinkChange Link: 1.0 is DOWN.
Where in the BIG-IP Configuration utility should the BIG-IP Administrator verify the current status of Link 1.0?
Answer: D
Explanation:
Identifying network-level performance issues often starts with investigating hardware-level alerts.
In F5 terminology, a "Link" like "1.0" or "1.1" refers to a physical interface on the appliance. When an SNMP trap reports that a link is "DOWN," it indicates a loss of signal or an administrative shutdown of the physical port. To verify this, the administrator must navigate to Network > Interfaces > Interface List. This screen provides real-time status, showing whether the interface is
"up," "down," or "uninitialized," as well as any media speed or duplex mismatches that could be causing performance degradation. Troubleshooting this is the first step in resolving "pool member down" or "VLAN failsafe" issues, as a down interface will take down any VLANs associated with it, immediately halting all traffic flow for the services relying on that physical path.
NEW QUESTION # 84
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages. Which log file should the BIG-IP Administrator check to verify the suspicion?
Answer: B
Explanation:
On a BIG-IP system, hardware-related alerts, including those for power supply units (PSUs), fans, and chassis components, are primarily logged in the Local Traffic Manager (LTM) log file.
Log Location: The file path is /var/log/ltm.
PSU Alert Messages: When a power supply fails, experiences an outage, or is unplugged, the chmand (Chassis Manager) or system_check processes log specific error codes to this file. For example, you may see messages like 010d0006:0: Chassis power supply <X> has experienced an issue or VINPUT=bad.
Troubleshooting: Administrators can use the command grep -i "power supply" /var/log/ltm to quickly filter for PSU-related events.
NEW QUESTION # 85
Which Virtual Server type prevents the use of a default pool?
Answer: D
Explanation:
In BIG-IP TMOS administration, the "Forwarding (IP)" virtual server type is unique because it is designed to act as a high-performance router rather than a typical load balancer. Unlike a
"Standard" virtual server, which terminates a connection and directs it to a specific pool of members, a Forwarding (IP) virtual server is intended to forward packets based on the system's routing table. Consequently, the configuration for this type of virtual server explicitly removes the option to associate a default pool. If an administrator is troubleshooting a scenario where they cannot assign a pool to a virtual server, they must verify if the type was accidentally set to Forwarding (IP). This type is most commonly used for outbound internet traffic (outbound SNAT) or to allow the BIG-IP to serve as a gateway between internal subnets. Identifying this constraint is vital for troubleshooting configuration errors where an administrator expects the system to load balance traffic but finds the pool association settings are grayed out or unavailable in the Configuration Utility.
NEW QUESTION # 86
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