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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting and Support | 25% | - Common troubleshooting scenarios - SNMP and monitoring - Logging and log configuration - tcpdump and network capture - iRules debugging - Performance and resource monitoring |
| Security and Access | 10% | - Role-based access control (RBAC) - Packet filtering - User authentication (Remote Auth, LDAP, RADIUS) - SSL/TLS configuration |
| Architecture and Components | 15% | - BIG-IP system architecture - Device service clustering (DSC) - High availability (HA) configurations - Traffic flow and packet processing |
| Local Traffic Management (LTM) | 30% | - Health monitors and monitory types - iRules and persistence profiles - Pools and pool members - Virtual servers (Standard, Performance L4, Forwarding) - Load balancing modes - SSL profiles and offloading |
| Initial Setup and Configuration | 20% | - Network configuration (VLANs, Self IPs, Routes) - Network failover setup - User management and role-based access - NTP and DNS configuration - Initial provisioning (Provisioning, License) |
GoShikenはF5のF5CAB5認定試験に受かりたい各受験生に明確かつ顕著なソリューションを提供しました。当社はF5のF5CAB5認定試験の詳しい問題と解答を提供します。当社のIT専門家が最も経験と資格があるプロな人々で、我々が提供したテストの問題と解答は実際の認定試験と殆ど同じです。これは本当に素晴らしいことです。それにもっと大切なのは、GoShikenのサイトは世界的でF5CAB5試験トレーニングによっての試験合格率が一番高いです。
質問 # 17
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system.
Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
正解：A
解説：
When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached. The key indicator in this scenario is that the problem only affects "some users" and happens when the server is
"busy," suggesting that the system is hitting a capacity ceiling rather than suffering from a persistent configuration error. Unlike a missing SSL profile, which would likely cause all connections to fail, or a "Connection Rate Limit," which throttles how fast connections arrive, a
"Connection Limit" focuses on the total volume. Identifying this as the cause requires reviewing the Virtual Server's statistics to see if the "Current Connections" count is consistently peaking at the configured limit value.
質問 # 18
Refer to the exhibit.
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, traffic was not evenly distributed and the pool member 172.16.20.3 received more traffic than the other pool members.
Refer to the exhibit and the virtual server configuration provided below:
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
persist {
source_addr { default yes }
}
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
}
What is the most likely cause of this behavior?
正解：D
解説：
The primary reason for the uneven traffic distribution is the presence of a Persistence Profile in the virtual server configuration.
Load Balancing vs. Persistence: While the Round Robin method is designed to distribute new connections sequentially among pool members, Persistence overrides this logic for existing clients.
Source Address Persistence: The configuration shows source_addr persistence is enabled. This ensures that once a client (identified by their source IP) is mapped to a pool member, all subsequent connections from that same IP will be sent to the same member for the duration of the persistence record.
Uneven Distribution Logic: If one source IP address generates significantly more connections or longer-lived sessions than others--or if many clients appear behind a single NAT/Proxy IP--that specific pool member (in this case, 172.16.20.3) will receive a disproportionate amount of traffic compared to the others.
質問 # 19
A BIG-IP Administrator makes a configuration change to a Virtual Server on the Standby device of an HA pair. The HA pair is currently configured with Auto-Sync Enabled. What effect will the change have on the HA pair configuration?
正解：A
解説：
Understanding High Availability (HA) synchronization behavior is critical for maintaining a stable environment. In a device group where "Auto-Sync" is enabled, the BIG-IP system monitors the management plane for any configuration updates across all members. While best practices often suggest making changes on the "Active" device, TMOS allows changes on any device within the group. When a change is made on the
"Standby" device, the system detects a configuration mismatch and, because Auto-Sync is enabled, it automatically pushes those changes to the other devices in the sync group, including the current Active member. To troubleshoot if this is working correctly, the administrator should review the "Sync Status" stats in the Configuration Utility. If the changes do not propagate, it suggests9 a breakdown i10n the HA trust relationship or network connectivity issues on the failover VLAN. Proper interpretation of this scenario confirms that the HA functionality is operating correctly, ensuring that both devices have a consistent set of virtual servers and pools, which is vital f11or seamless failover.
質問 # 20
A Virtual Server uses an iRule to send traffic to pool members depending on the URI. The BIG-IP Administrator needs to modify the pool member in the iRule. Which event declaration does the BIG-IP Administrator need to change to accomplish this?
正解：D
質問 # 21
Refer to the exhibit.
The image shows the status of a virtual server namedapplication_vsin the BIG-IP Configuration Utility.
What is the cause of the status shown? (Choose two answers)
正解：A、B
解説：
The exhibit shows the virtual serverapplication_vswith a status indicating it isoffline but enabled. In BIG-IP terminology, this status means the virtual server itself is administratively enabled, but it is unable to pass traffic becauseno 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 reviewingpool and node availability stateswhen diagnosing virtual server availability issues.
質問 # 22
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