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| Section | Weight | Objectives |
|---|---|---|
| Local Traffic Management (LTM) | 30% | - iRules and persistence profiles - SSL profiles and offloading - Pools and pool members - Health monitors and monitory types - Load balancing modes - Virtual servers (Standard, Performance L4, Forwarding) |
| Architecture and Components | 15% | - Device service clustering (DSC) - BIG-IP system architecture - High availability (HA) configurations - Traffic flow and packet processing |
| Security and Access | 10% | - SSL/TLS configuration - User authentication (Remote Auth, LDAP, RADIUS) - Role-based access control (RBAC) - Packet filtering |
| Initial Setup and Configuration | 20% | - User management and role-based access - Network failover setup - Network configuration (VLANs, Self IPs, Routes) - Initial provisioning (Provisioning, License) - NTP and DNS configuration |
| Troubleshooting and Support | 25% | - iRules debugging - tcpdump and network capture - Common troubleshooting scenarios - Performance and resource monitoring - Logging and log configuration - SNMP and monitoring |
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NEW QUESTION # 17
A gateway_icmp health monitor is configured on a pool. The BIG-IP Administrator is investigating why the pool is reported as down while the server is online. Other pools with servers in the same subnet are correctly monitored.
What can cause this behavior? (Choose one answer)
Answer: D
Explanation:
A gateway_icmp monitor checks basic network reachability by sending ICMP echo requests (pings) to the pool member or its gateway. If the pool is marked DOWN while the server is confirmed to be online, the most likely cause is that ICMP traffic is being blocked.
A host-based firewall active on the server (Option C) can block ICMP echo requests or replies, preventing BIG-IP from receiving a successful response to the health check. This results in the monitor failing and the pool member being marked down, even though the server and application are otherwise functioning normally. This explanation is consistent with the scenario where other servers in the same subnet work correctly, indicating that routing and BIG-IP configuration are not the issue.
The other options are unrelated to ICMP monitoring. Logged-in users (Option A), missing patches (Option B), and stopped HTTP services (Option D) do not affect a gateway_icmp monitor. BIG-IP troubleshooting best practices recommend verifying ICMP reachability and firewall policies when diagnosing ICMP-based monitor failures.
NEW QUESTION # 18
A BIG-IP Administrator needs to determine why only one pool member is showing connections from the virtual server, resulting in uneven load balancing. What two reasons would cause uneven load balancing? (Choose two answers)
Answer: C,D
Explanation:
Uneven load balancing on a BIG-IP system typically occurs when traffic is not distributed evenly across all available pool members. One common reason is thatmonitors have marked down multiple pool members (Option B). When health monitors fail for specific pool members, BIG-IP automatically removes those members from load-balancing decisions. As a result, traffic is sent only to the remaining healthy member, creating the appearance that load balancing is not functioning correctly.
This behavior is expected and aligns with BIG-IP's design to ensure traffic is sent only to healthy resources.
Another frequent cause isthe presence of a persistence profile on the pool or virtual server (Option C). Persistence (such as source address or cookie persistence) forces subsequent client connections to be sent to the same pool member for session continuity. While persistence is critical for certain applications, it can override the load-balancing algorithm and cause most or all traffic to be directed to a single pool member, especially during low traffic volumes or testing scenarios.
NEW QUESTION # 19
Which two methods should the BIG-IP Administrator troubleshoot a Pool-member that's been marked
"DOWN" by its Health Monitor? (Pick the 2 correct responses below)
Answer: A,D
Explanation:
When a health monitor marks a member "Down," the goal is to determine if the issue is at the network level or the application level.
* Monitor Logging (Option A): In the Pool Member configuration, an administrator can enable
"Monitor Logging". This generates a detailed text file in /var/log/monitors/ that shows the exact "Send" string sent by the BIG-IP and the exact "Receive" string (or lack thereof) returned by the server.
* TCPdump (Option C): This is the most definitive way to see if the monitor traffic is even leaving the BIG-IP and if the server is responding with a TCP RST (reset) or an ICMP unreachable message. A command such as tcpdump -ni <vlan> host <member_ip> and port <member_port> is standard for this task.
* Why not others? While the routing table (Option B) is useful for general connectivity, if other members in the same subnet are "Up," the routing is likely fine. Statistics (Option D) show that it is down but rarely why it is down at a protocol level.
NEW QUESTION # 20
What determines whether a pool member is marked up or down?
Answer: D
Explanation:
Health monitors check backend availability and determine pool member status.
NEW QUESTION # 21
A BIG-IP Administrator notices that one of the servers that runs an application is NOT receiving any traffic. The BIG-IP Administrator examines the configuration status of the application and observes the displayed monitor configuration and affected pool member status.
What is the possible cause of this issue? (Choose one answer)
Answer: B
Explanation:
The key clue in the exhibit is the pool member's availability showing"Offline (Enabled) ?Parent down". In BIG-IP terminology, a pool member inherits the status of itsparent node. If thenodeis marked down (for example, by a node-level monitor or a default "node is down" condition), thenall pool members using that node IPwill also be marked down and will not receive any traffic, even if the application service on the member port might be healthy.
While the HTTPS monitor configuration (send/receive strings) is displayed, the status specifically indicates anode (parent) failure, not a service-level failure. If the problem were the application not matching the receive string, you would typically see the member down due to themember's monitorfailing (and the status would reflect monitor failure details), rather than "parent down."
NEW QUESTION # 22
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