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| Section | Weight | Objectives |
|---|---|---|
| Architecture and Components | 15% | - Device service clustering (DSC) - High availability (HA) configurations - Traffic flow and packet processing - BIG-IP system architecture |
| Security and Access | 10% | - Packet filtering - User authentication (Remote Auth, LDAP, RADIUS) - Role-based access control (RBAC) - SSL/TLS configuration |
| Local Traffic Management (LTM) | 30% | - SSL profiles and offloading - Load balancing modes - iRules and persistence profiles - Pools and pool members - Health monitors and monitory types - Virtual servers (Standard, Performance L4, Forwarding) |
| Troubleshooting and Support | 25% | - iRules debugging - Performance and resource monitoring - Logging and log configuration - Common troubleshooting scenarios - SNMP and monitoring - tcpdump and network capture |
| Initial Setup and Configuration | 20% | - NTP and DNS configuration - Network failover setup - Network configuration (VLANs, Self IPs, Routes) - User management and role-based access - Initial provisioning (Provisioning, License) |
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NEW QUESTION # 41
Refer to the exhibit.
The image shows the status of a virtual server named application_vs in the BIG-IP Configuration Utility.
What is the cause of the status shown? (Choose two answers)
Answer: C,D
Explanation:
The exhibit shows the virtual server application_vs with a status indicating it is offline but enabled. In BIG-IP terminology, this status means the virtual server itself is administratively enabled, but it is unable to pass traffic because no usable pool members are available.
Two common and documented causes for this condition are:
Pool member(s) administratively disabled (Option A):
When all pool members are administratively disabled, BIG-IP removes them from load-balancing decisions. Even though the virtual server remains enabled, it has no available pool members to send traffic to, resulting in an offline status.
Node(s) administratively disabled (Option C):
Pool members inherit the status of their parent nodes. If a node is administratively disabled, all associated pool members are also marked unavailable. This condition causes the virtual server to show as offline, even though the virtual server configuration itself is correct.
The other options are incorrect:
Forced offline pool members (Option B) result in a different operational intent and are explicitly set for maintenance scenarios.
Virtual server administratively disabled (Option D) would show the virtual server as disabled, not enabled/offline.
This behavior is consistent with BIG-IP traffic management logic and is commonly verified by reviewing pool and node availability states when diagnosing virtual server availability issues.
NEW QUESTION # 42
A traffic group includes four devices. The failover method is HA order. The failover order is:
- BIGIP-D
- BIGIP-B
- BIGIP-C
- BIGIP-A
Auto fallback is enabled. BIGIP-D has been forced to standby. BIGIP-B was active before being rebooted. Which device is active when BIGIP-B is up after the reboot?
Answer: B
Explanation:
To understand which device becomes active, we must look at how the BIG-IP system handles HA Order and Auto Fallback within a traffic group.
HA Order Mechanism: When a traffic group is configured with an "HA Order" list, the system prefers to host the traffic group on the highest-ranking available device in that list (1 being the highest).
The Impact of "Forced to Standby": BIGIP-D is the first choice in the order, but it has been
"Forced to Standby." This state is persistent and manual; until an administrator releases the
"Force to Standby" state, the device is ineligible to host the traffic group, effectively removing it from the top of the preference list.
Auto Fallback: When "Auto Fallback" is enabled, the traffic group will automatically migrate back to a higher-priority device in the HA order as soon as that device becomes available and is in a healthy "Standby" state.
The Scenario Logic:
1. BIGIP-D is ineligible (Forced Offline/Standby).
2. BIGIP-B is the next highest device in the HA Order (Rank 2).
3. While BIGIP-B was rebooting, the traffic group would have failed over to BIGIP-C (Rank 3).
4. Once BIGIP-B finishes booting and joins the cluster in a "Standby" state, the Auto Fallback setting triggers.
5. Because BIGIP-B is higher in the HA Order than the current active device (BIGIP-C) and the only device above it (BIGIP-D) is ineligible, the traffic group fails back to BIGIP-B.
NEW QUESTION # 43
A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, the virtual server failed to respond to http requests.
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address enabled
translate-port enabled
}
ltm pool http_pool {
members {
10.10.1.101:http {
address 10.10.1.101
session monitor-enabled
state checking
}
10.10.1.102:http {
address 10.10.1.102
session monitor-enabled
state checking
}
}
monitor tcp
}
What configuration change on the BIG-IP will resolve this issue?
Answer: B
Explanation:
The issue described is a classic case of asymmetric routing in a "one-arm" or same-subnet topology.
Symptom Analysis: The Virtual Server (10.10.1.100) and the pool members (10.10.1.101 and 10.10.1.102) are on the same subnet.
The Problem: When a client sends a request to the VIP, the BIG-IP translates the destination IP but keeps the client's original source IP. The server receives the packet and sees a source IP from a different subnet. Instead of sending the response back to the BIG-IP, the server sends it directly to its default gateway. The client receives a response from the server's IP, which it doesn't recognize, causing the connection to fail.
The Solution: Enabling SNAT Auto Map ensures the BIG-IP changes the source IP of the packet to its own self-IP. This forces the pool member to send the response back to the BIG-IP, which then translates it correctly and sends it to the client.
Incorrect Options: Adding an HTTP profile (Option B) or an HTTP monitor (Option C) would enhance the configuration but would not fix the underlying Layer 3 routing issue causing the traffic drop.
NEW QUESTION # 44
A BIG-IP Administrator observes the following messages in the /var/log/ltm log:
warning tmm[pid]: 011e0002: sweeper_segment_cb_any: Aggressive mode /Common/default-eviction-policy activated (0) (global memory) (345209/690176 pages) warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed What is happening when the BIG-IP Administrator sees the messages displayed above? (Choose two answers)
Answer: B,D
Explanation:
Comprehensive and Detailed 150 to 250 Words Explanation From BIG-IP Administration, Support, and Troubleshooting Documents:
These log messages indicate that the BIG-IP system's Traffic Management Microkernel (TMM) has entered aggressive eviction mode due to high global memory utilization. When TMM memory consumption reaches critical thresholds, BIG-IP activates the default eviction policy to protect system stability and prevent a full traffic processing failure. This condition directly corresponds to Option A, where the global eviction policy is triggered because TMM memory resources are nearing exhaustion.
Once aggressive mode is activated, BIG-IP begins using the connection sweeper mechanism, which selectively terminates existing connections to free memory. The repeated log entries stating "1 connections killed" confirm that the system is reaping some connections, not all connections. This behavior matches Option C. The eviction process is incremental and controlled, targeting idle, low-priority, or least-recently-used connections first to minimize impact on active traffic.
Option B is incorrect because BIG-IP does not drop all connections during aggressive mode; it only removes enough connections to relieve memory pressure. Option D is also incorrect because TMM eviction is based on TMM global memory usage, not swap memory utilization. TMM does not rely on swap space in the same way the host Linux system does.
These messages are a critical warning sign that the system is under memory stress and may require traffic optimization, connection limits, or hardware scaling.
NEW QUESTION # 45
A BIG-IP Administrator adds new Pool Members into an existing, highly utilized pool. Soon after, there are reports that the application is failing to load for some users. What pool level setting should the BIG-IP Administrator check?
Answer: B
Explanation:
When troubleshooting a pool that is not working correctly after adding new members, the "Slow Ramp Time" setting is a primary suspect. In a pool that is already under high load and using a "Least Connections" load balancing method, a newly added server has zero connections. Without a slow ramp time, the BIG-IP will immediately direct a massive flood of new connections to the new server to "balance" it with the others. This "thundering herd" effect can crash a newly initialized application server before it has time to warm up its caches or establish its own database connections. By setting a "Slow Ramp Time" (typically in seconds), the administrator ensures the BIG-IP gradually increases the connection ratio to the new member. This allows the server to stabilize and scale up its performance over time. If users report intermittent failures specifically coinciding with the expansion of a pool, checking this setting is a vital troubleshooting step to maintain pool health during maintenance.
NEW QUESTION # 46
......
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