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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Exam Format: | Scenario-based, Multiple Choice |
| Exam Price: | $50 USD |
| Passing Score: | Pass/Fail (Scaled scoring, specific threshold not publicly disclosed per sub-exam) |
| Related Certifications: | F5 Certified Administrator, BIG-IP (F5-CA) |
| Available Languages: | English |
| Exam Duration: | 30 minutes |
| Real Exam Qty: | 30 |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online (Pearson VUE) |
| Pre Condition: | None specified. It is one of five exams required for the F5 Certified Administrator, BIG-IP credential. |
| Official Syllabus URL: | https://education.f5.com/courses/1089 |
JPTestKingのIT専門家たちは彼らの豊富な知識と経験を活かして最新の短期で成果を取るF5CAB2トレーニング方法を研究しました。このトレーニング方法は受験生の皆さんに短い時間で予期の成果を取らせます。特に仕事しながら勉強している受験生たちにとって不可欠なツールです。F5CAB2トレーニング資料を選んだら、あなたは自分の夢を実現できます。
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質問 # 26
A BIG-IP Administrator explicitly creates a traffic group on a BIG-IP device. Which two types of configuration objects can be associated with this traffic group? (Choose two.)
正解：C、D
解説：
ATraffic Groupis a collection of related configuration objects that fail over together from one BIG-IP device to another. Only "floating" objects can be members of a traffic group.
* Virtual Addresses (C):A virtual address (the IP part of a Virtual Server) is a floating object. It is assigned to a traffic group so that the entire IP moves to the standby unit during a failover.
* Floating Self IPs (E):These are used as gateways for backend servers or SNAT addresses. By associating them with a traffic group, they remain reachable by the backend network regardless of which BIG-IP is currently active.
Why other options are incorrect:
* iRules (A):iRules are configuration logic files; they are synchronized across devices but are not
"hosted" by a traffic group.
* VLANs (D):VLANs are local to the hardware interfaces/trunks of each specific device and do not fail over.
質問 # 27
The BIG-IP Administrator wants to provide quick failover between the F5 LTM devices that are configured as an HA pair with a single Self IP using the MAC Masquerade feature. The administrator configures MAC masquerade for traffic-group-1 using the following command:
`tmsh modify /cm traffic-group traffic-group-1 mac 02:12:34:56:00:00`
However, the Network Operations team identifies an issue with using the same MAC address across multiple VLANs. As a result, the administrator enables Per-VLAN MAC Masquerade to ensure a unique MAC address per VLAN by running:
`tmsh modify /sys db tm.macmasqaddr_per_vlan value true`
What would be the resulting MAC address on a tagged VLAN with ID 1501? (Choose one answer)
正解：A
解説：
In BIG-IP high availability (HA) configurations, MAC Masquerade is used to speed up failover by allowing traffic-group-associated Self IPs to retain the same MAC address when moving between devices. This prevents upstream switches and routers from having to relearn ARP entries during a failover event, resulting in near-instant traffic recovery.
By default, MAC masquerade applies one MAC address per traffic group, regardless of how many VLANs the traffic group spans. This can create problems in some network designs because the same MAC address appearing on multiple VLANs may violate network policies or confuse switching infrastructure.
To address this, BIG-IP provides Per-VLAN MAC Masquerade, enabled by the database variable:
`tm.macmasqaddr_per_vlan = true`
When this feature is enabled:
BIG-IP derives a unique MAC address per VLAN
The base MAC address configured on the traffic group remains the first four octets The last two octets are replaced with the VLAN ID expressed in hexadecimal The VLAN ID is encoded in network byte order (high byte first, low byte second)
### VLAN ID Conversion:
VLAN ID: 1501 (decimal)
Convert to hexadecimal:
1501₁₀ = 0x05DD
High byte: 05
Low byte: DD
### Resulting MAC Address:
Base MAC: `02:12:34:56:00:00`
Per-VLAN substitution → last two bytes = `05:DD`
Final MAC address:
`02:12:34:56:05:dd`
### Why the Other Options Are Incorrect:
A (01:15) - Incorrect hexadecimal conversion of 1501
B (dd:05) - Byte order reversed (little-endian, not used by BIG-IP)
D (15:01) - Uses decimal values instead of hexadecimal
### Key BIG-IP HA Concept Reinforced:
Per-VLAN MAC Masquerade ensures Layer 2 uniqueness per VLAN while preserving the fast failover benefits of traffic groups, making it the recommended best practice in multi-VLAN HA deployments.
質問 # 28
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
正解：A
解説：
The diagram illustrates a specific TCP handshake sequence where the BIG-IP system acts as a transparent forwarder rather than a full proxy. The key indicators that identify this as aForwarding (IP) virtual server are as follows:
* Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet lookingonly at the destination IP address. This is the fundamental characteristic of a Forwarding IP virtual server, which uses the system's routing table to make forwarding decisions instead of load balancing to a pool of members.
* Handshake Sequence: Unlike aStandardvirtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK)beforeinitiating a separate connection to the server, the Forwarding IP virtual server passes the client's originalSYNpacket directly to the destination node.
* Response Timing: The BIG-IP system waits for theSYN-ACKfrom the destination node before it sends a SYN-ACK back to the client. It essentially "passes through" the handshake signals while still maintaining a state entry in the connection table to track the flow.
* Packet-by-Packet Logic: While it tracks the state, it does not perform address translation (unless SNAT is specifically configured) or deep packet inspection like a full proxy would.
Why other options are incorrect:
* Standard virtual server: A Standard virtual server is a "full proxy." It would finish the handshake with the client first and only then open a second, independent TCP connection to the backend server.
* Stateless virtual server: A stateless virtual server does not track connections in the connection table.
The diagram shows the system meticulously passing sequence numbers ($seq\_num$) and acknowledgment numbers ($ack\_num$) between the two sides, which requires stateful tracking of the TCP flow.
質問 # 29
A development team needs to apply a software fix and troubleshoot one of its servers. The BIG-IP Administrator needs to immediately remove all connections from the BIG-IP system to the back-end server.
The BIG-IP Administrator checks the virtual server configuration and finds that a persistence profile is assigned to it.
What should the BIG-IP Administrator do to meet this requirement? (Choose one answer)
正解：D
解説：
In BIG-IP traffic management, persistence profiles cause existing client connections (and subsequent requests) to be repeatedly sent to the same pool member. When persistence is enabled, simply preventing new connections is not sufficient if the requirement is to immediately remove all existing connections.
Key behavior of pool member states:
* Forced Offline
* Immediately removes the pool member from load balancing.
* Terminates all existing connections, regardless of persistence.
* Prevents new connections from being established.
* This is the correct state when urgent maintenance or troubleshooting is required.
* Disabled
* Prevents new connections from being sent to the pool member.
* Allows existing connections to continue, which is not acceptable when persistence is configured and connections must be cleared immediately.
* Offline (non-forced)
* Similar to Disabled behavior depending on context.
* Does not guarantee immediate termination of existing connections.
* Manually deleting connections via the command line
* Is unnecessary and operationally inefficient.
* BIG-IP already provides a supported mechanism (Forced Offline) to cleanly and immediately remove traffic.
Conclusion:
To immediately remove all existing connections, including those maintained by persistence, the BIG-IP Administrator must set the pool member to a Forced Offline state. This directly satisfies the requirement without additional manual steps.
質問 # 30
Which statement is true concerning the default communication between a redundant pair of BIG-IP devices?
正解：C
解説：
Redundant BIG-IP systems (HA pairs) must maintain constant communication to monitor the health of the peer and synchr15onize states.16
* Heartbeats: By default, even with a serial cable, th17e BIG-IP systems exchange "heartbeat" packets over the network to determine if the peer is still alive.
* Network Failover: This involves the exchange of UDP packets (typically on port 1026) at regular intervals.
* Device Service Clustering (DSC): Modern BIG-IP versions use the Central Management (cm) infrastructure to communicate configuration status and sync status constantly.
* Clarification on others: Port lockdown does affect HA communication if misconfigured (A is false).
Mirroring uses separate channels (B is false). Mirroring is never sent over the serial cable because it requires high bandwidth (D is false).
質問 # 31
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F5CAB2認証pdf資料: https://www.jptestking.com/F5CAB2-exam.html
P.S.JPTestKingがGoogle Driveで共有している無料の2026 F5 F5CAB2ダンプ：https://drive.google.com/open?id=1X-yLDDpIUXardmBeBjKsqwbVJHL6yavR