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NEW QUESTION # 16
A BIG-IP Administrator needs to have a BIG-IP linked to two upstream switches for resilience of the external network. The network engineer who is going to configure the switch instructs the BIG-IP Administrator to configure interface binding with LACP. Which configuration should the administrator use?
Answer: C
Explanation:
In BIG-IP terminology, a Trunk is the object used to implement Link Aggregation (IEEE 802.3ad/802.1AX). When a network engineer refers to "interface binding" or "EtherChannel" with LACP, the BIG-IP equivalent is a Trunk.
LACP (Link Aggregation Control Protocol): This is a protocol that allows the BIG-IP system to communicate with the upstream switches to negotiate the bundling of multiple physical links into a single logical link.
Resilience and Redundancy: By creating a trunk that includes interfaces connected to two different switches (typically configured as a VPC, VSS, or MLAG cluster on the switch side), the administrator ensures that the BIG-IP remains reachable even if one physical interface or one switch fails.
Data Plane Logic: The BIG-IP treats the trunk as a single Layer 2 interface. VLANs are then associated with the trunk rather than individual physical ports.
Why the other options are incorrect:
Option B: Trunks aggregate physical interfaces. While VLANs are associated with trunks, the trunk configuration itself does not "list" MAC addresses of the switches; it uses LACP to negotiate the connection.
Options C & D: Virtual Servers are Layer 4-7 objects used for traffic processing and load balancing. They do not possess "LACP profiles," nor are physical interfaces or management IPs treated as pool members for the purpose of link aggregation.
NEW QUESTION # 17
A BIG-IP Administrator is making adjustments to an iRule and needs to identify which of the 235 Virtual Servers configured on the BIG-IP device will be affected. How should the administrator obtain this information in an efficient way?
Answer: C
Explanation:
When managing a large environment with hundreds of Virtual Servers, the most efficient way to identify the relationship between an iRule and the objects it manages is to view the properties of the iRule itself.
* iRule Properties:Within the BIG-IP Configuration Utility, navigating toLocal Traffic > iRulesand selecting a specific iRule provides a "Statistics" or "Usage" tab (depending on the version). This view explicitly lists all Virtual Servers currently associated with that specific iRule.
* Centralized Management:Instead of manually checking 235 individual Virtual Servers under the
"Virtual Servers" menu, the iRules menu acts as a central point of reference for that specific logic.
* Data Plane Impact:Because iRules can modify traffic flow, headers, and load balancing decisions, seeing the full list of affected Virtual Servers is critical before making adjustments to avoid unintended side effects across the application portfolio.
NEW QUESTION # 18
What are two features of an application delivery controller (ADC)?
Pick the 2 correct responses below.
Answer: A,B
Explanation:
An Application Delivery Controller (ADC) provides application traffic-management functions between clients and application servers. Two fundamental ADC capabilities represented here are SSL offloading and load balancing.
SSL offloading allows the BIG-IP system to terminate client-side SSL/TLS connections and perform the cryptographic processing that would otherwise consume application-server resources. F5 specifically describes SSL offload as the BIG-IP system performing the SSL handshake and encryption/decryption functions normally performed by the destination server. Client SSL profiles are commonly applied to virtual servers to implement this functionality.
Load balancing is another core ADC function. BIG-IP LTM uses pools and configured load-balancing algorithms to select an appropriate pool member for each connection or request. For example, with Round Robin, BIG-IP distributes incoming requests sequentially across available pool members. F5 identifies the load-balancing method as a fundamental property of a server pool.
Log collecting can occur as part of system administration and telemetry, but it is not one of the fundamental ADC functions being tested here. Screen sharing is an end-user collaboration capability and has no role in ADC traffic delivery.
Study Guide Reference/Topics: Application Delivery Controller Functions; SSL/TLS Offload; Virtual Servers and SSL Profiles; Pools; Load-Balancing Methods.
NEW QUESTION # 19
An application is configured so that the same pool member must be used for an entire session, and this behavior must persist across HTTP and FTP traffic. A user reports that a session terminates and must be restarted after the active BIG-IP device fails over to the standby device.
Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs? (Choose one answer)
Answer: C
Explanation:
These are DoS / SYN flood protection settings, unrelated to persistence or HA behavior.
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
This scenario combines session continuity, multiple protocols (HTTP and FTP), and HA failover behavior, which directly implicates persistence handling across devices and services.
Key Requirements Breakdown
Same pool member for entire session
Session must survive failover
Session must span multiple services (HTTP and FTP)
Why Persistence Mirroring + Match Across Services Is Required
Persistence Mirroring
Ensures persistence records are synchronized from the active BIG-IP to the standby BIG-IP.
Without mirroring:
After failover, the standby device has no persistence table
Clients are load-balanced again
Sessions break, forcing users to restart
Persistence mirroring is essential for session continuity during failover Match Across Services Allows a single persistence record to be shared across multiple virtual servers / protocols Required when:
HTTP and FTP must use the same pool member
Multiple services are part of a single application session
Together, these settings ensure:
Persistence survives device failover
Persistence is honored across HTTP and FTP
Why the Other Options Are Incorrect
A . Cookie persistence and session timeout
Cookie persistence only applies to HTTP and does not address FTP or failover synchronization.
B . Stateful failover and Network Failover detection
Stateful failover applies to connection state, not persistence records, and does not link HTTP and FTP sessions.
NEW QUESTION # 20
The network architecture for a BIG-IP consists of an external VLAN and an internal VLAN with two interfaces connected to the upstream switch. The design requires fault tolerance in the case that one of the interfaces is down. Which deployment architecture meets these requirements? (Choose one answer)
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
To meet the requirement of fault tolerance when one interface goes down, BIG-IP must use link aggregation so that loss of a single physical link does not isolate the VLAN(s).
How the objects relate (data plane view)
Interfaces = physical links.
Trunk (LACP) = bundles multiple interfaces into one logical link that provides redundancy (and possibly bandwidth aggregation).
VLANs are assigned to interfaces or trunks. If you need multiple VLANs on the same trunk, they must use 802.1Q tagging (because you can only have one untagged VLAN per interface/trunk).
Self IPs are then placed on the VLANs to provide BIG-IP presence and routing/ARP functions, but self IPs are not what provides link resiliency-the trunk does.
Why Option D is correct
You have two physical interfaces and you want resiliency if one fails โ put both interfaces into one trunk with LACP enabled.
You need both external and internal VLANs on those same two links โ both VLANs should be configured as tagged on that trunk, so they can coexist on the same aggregated link.
If either physical interface fails, the trunk remains up via the remaining interface, keeping both VLANs operational.
Why the other options are incorrect
A: Two VLANs cannot both be untagged on the same trunk/interface. Only one untagged VLAN is possible; additional VLANs must be tagged.
B: Two trunks "each with one VLAN" would typically mean splitting VLANs across separate trunks. With only two interfaces total, that becomes one interface per trunk-if one interface goes down, the VLAN on that interface is down (no redundancy for that VLAN).
C: Same redundancy problem as B, and disabling LACP removes the negotiated aggregation behavior expected when the switch engineer specifically requested LACP.
NEW QUESTION # 21
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