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| Section | Weight | Objectives |
|---|---|---|
| Security and Access | 10% | - SSL/TLS configuration - User authentication (Remote Auth, LDAP, RADIUS) - Packet filtering - Role-based access control (RBAC) |
| Architecture and Components | 15% | - Device service clustering (DSC) - High availability (HA) configurations - Traffic flow and packet processing - BIG-IP system architecture |
| Local Traffic Management (LTM) | 30% | - SSL profiles and offloading - Virtual servers (Standard, Performance L4, Forwarding) - Health monitors and monitory types - iRules and persistence profiles - Load balancing modes - Pools and pool members |
| Initial Setup and Configuration | 20% | - Network configuration (VLANs, Self IPs, Routes) - NTP and DNS configuration - User management and role-based access - Network failover setup - Initial provisioning (Provisioning, License) |
| Troubleshooting and Support | 25% | - Performance and resource monitoring - Common troubleshooting scenarios - tcpdump and network capture - Logging and log configuration - SNMP and monitoring - iRules debugging |
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NEW QUESTION # 51
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: A
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 # 52
Where should the BIG-IP Administrator go in the GUI to verify the status of pool members of a pool?
Answer: C
Explanation:
To verify the specific health and availability status of individual members within a specific pool, the administrator must navigate to the Members tab of that specific pool.
* Navigation Path: The correct path is Local Traffic > Pools > Pool List, then clicking on the name of the <pool_in_question>, and finally selecting the Members tab. This screen provides a granular view of each member's IP address, port, and their current status (indicated by the colored icons: Green, Red, Yellow, or Blue).
* Why Option A is correct: While you can see a general status summary on the Pool List page (Option B), that page only shows the status of the pool as a whole. To troubleshoot why a pool is not working or to see which specific member is down, you must drill down into the Members tab.
* Evaluation of Other Options:
* Local Traffic -> Pools (Option B): This leads to the Pool List. It shows the aggregate status of all pools but does not list individual member details or their specific monitor results without further clicking.
* Local Traffic -> Virtual Servers -> Statistics (Option C): This path shows traffic statistics (bits in/out, connections) for virtual servers, not the health monitor status of individual pool members.
* Local Traffic -> Nodes (Option D): While this shows the health of the underlying IP address (Node), it does not show the status of the specific service (Port/Member) within a pool. A Node might be "Up" (ICMP), while the Pool Member is "Down" (HTTP failure).
NEW QUESTION # 53
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status from RED to GREEN?
Answer: B
Explanation:
Status changes for local traffic objects (Virtual Servers, Pools, Nodes) are recorded in the Local Traffic Manager (LTM) log.
Health State Logging: When a health monitor marks a resource as available (Green) or unavailable (Red), the system generates a log message in /var/log/ltm.
Log Entry Example: A transition from Red to Green will appear as a message similar to:
01010027:3: Pool /Common/my_pool member /Common/10.0.0.1:80 monitor status up.
NEW QUESTION # 54
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.
NEW QUESTION # 55
The BIG-IP Administrator is investigating disk utilization on the BIG-IP device. (Exhibit shows /dev/md4 mounted on / at 100% utilization). What should the BIG-IP Administrator check next?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: Monitoring resource utilization is essential for maintaining system stability. If the root (/) file system reaches 100% capacity, the BIG-IP may become unresponsive, fail to save configuration changes, or experience daemon crashes83. When the / partition is full, the immediate troubleshooting step is to identify large or unnecessary files-such as old log files, core dumps, or temporary installer files-located specifically within that file system84. In the provided exhibit, /dev/md4 is explicitly listed at 100% usage for the / mount point85. Checking other partitions like /usr (which is at 82% in the exhibit) would not resolve the immediate "Full" status of the root directory86. Administrators often use the du (disk usage) command via the CLI to find the problematic files. Managing disk space is a proactive task; however, when utilization hits 100%, it becomes a reactive troubleshooting emergency that must be resolved to restore the management plane's functionality.
NEW QUESTION # 56
......
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