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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration Data Plane Concepts (F5CAB2) |
| Exam Number: | F5CAB2 |
| Available Languages: | English |
| Related Certifications: | F5 BIG-IP Administrator F5 Application Delivery Fundamentals F5 Certified Administrator (F5-CA) |
| Exam Format: | Multiple Choice, Scenario-based Questions |
| Recommended Training: | F5 BIG-IP Fundamentals Training |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge and familiarity with TCP/IP concepts are recommended. |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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NEW QUESTION # 23
A network administrator is planning to add a trunk to a single BIG-IP system. What does a trunk provide?
(Pick the 2 correct responses below)
Answer: C,D
Explanation:
In the F5 BIG-IP ecosystem, atrunkis a logical grouping of two or more physical interfaces that the system treats as a single data path. This configuration is based on the Link Aggregation Control Protocol (LACP) or static link aggregation.
Trunks provide two primary benefits to the data plane:
* Increased Bandwidth:By aggregating multiple physical interfaces (e.g., combining two 10Gbps interfaces), the aggregate throughput of the logical connection is increased. This allows the BIG-IP to handle higher traffic volumes than a single interface could support.
* Link Redundancy:Trunks provide high availability at the physical layer. If one physical interface within the trunk fails or the cable is disconnected, the BIG-IP system automatically redistributes traffic across the remaining active interfaces in the trunk. This prevents a single cable or port failure from causing a network outage.
Why the other options are incorrect:
* Option C:While VLAN tags are often usedontrunks, the ability to use tagged VLANs is a property of theVLANconfiguration and 802.1Q tagging, not the trunk itself. A single interface can support tagged VLANs without being part of a trunk.
* Option D:Trunks are agnostic to the type of application traffic (such as VoIP) passing through them.
They operate at Layer 2 to provide a reliable pipe for any Layer 3+ traffic.
NEW QUESTION # 24
Which statement is true concerning the default communication between a redundant pair of BIG-IP devices?
Answer: C
Explanation:
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).
NEW QUESTION # 25
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)
Answer: B
NEW QUESTION # 26
A BIG-IP Administrator configures remote authentication and needs to ensure that users can still log in even when the remote authentication server is unavailable. Which action should the BIG-IP Administrator take in the remote authentication configuration to meet this requirement? (Choose one answer)
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
Although remote authentication (LDAP, RADIUS, TACACS+) is a control-plane / management-plane feature, it directly affects availability and resiliency of administrative access, which is a critical operational HA consideration.
How BIG-IP Remote Authentication Works:
BIG-IP can authenticate administrators against:
LDAP
RADIUS
TACACS+
When remote authentication is enabled, BIG-IP by default relies on the remote server for user authentication If the remote authentication server becomes unreachable, administrators may be locked out unless fallback is configured Why "Fallback to Local" Is Required:
The Fallback to Local option allows BIG-IP to:
Attempt authentication against the remote authentication server first
If the remote server is unreachable or unavailable, fall back to:
Local BIG-IP user accounts (admin, or other locally defined users)
This ensures:
Continuous administrative access
Safe recovery during:
Network outages
Authentication server failures
Maintenance windows
This behavior is explicitly recommended as a best practice in BIG-IP administration to avoid loss of management access.
Why the Other Options Are Incorrect:
A . Configure a second remote user directory
Provides redundancy only if both directories are reachable
Does not help if remote authentication as a whole is unavailable
B . Configure a remote role group
Maps remote users to BIG-IP roles
Does not affect authentication availability
D . Set partition access to "All"
Controls authorization scope after login
Has no impact on authentication success
Key Availability Concept Reinforced:
To maintain administrative access resiliency, BIG-IP administrators should always enable Fallback to Local when using remote authentication. This prevents lockouts and ensures access even during authentication infrastructure failures.
NEW QUESTION # 27
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
Answer: A
Explanation:
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 a Forwarding (IP) virtual server are as follows:
Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet looking only 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 a Standard virtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK) before initiating a separate connection to the server, the Forwarding IP virtual server passes the client's original SYN packet directly to the destination node.
Response Timing: The BIG-IP system waits for the SYN-ACK from 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.
NEW QUESTION # 28
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