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The BIG-IP Administration Data Plane Configuration (F5CAB3) web-based practice test is compatible with these browsers: Chrome, Safari, Internet Explorer, MS Edge, Firefox, and Opera. This BIG-IP Administration Data Plane Configuration (F5CAB3) practice exam does not require any software installation as it is web-based. It has similar specifications to the F5 F5CAB3 desktop-based practice exam software, but it requires an internet connection.
| Section | Weight | Objectives |
|---|---|---|
| SSL/TLS Configuration | 15-20% | - Certificate validation settings - Certificate and key management - SSL termination and re-encryption - SSL profiles (Client and Server) - Cipher groups and compatibility |
| LTM Fundamentals | 15-20% | - Objects and their relationships - Configuration architecture and files - License and provisioning modules - Licensing types - Traffic Management Shell (tmsh) CLI |
| Traffic Management Features | 15-20% | - Connection limits and rate shaping - Compression and caching profiles - NAT and SNAT concepts - OneConnect - HTTP profile settings - iRules basics and events |
| Virtual Servers and Pools | 25-30% | - Load balancing algorithms - Node and pool management - Virtual server types (Standard, Forwarding, Performance L4, Regex) - Pool configuration and members - Virtual server configuration options - Priority group activation - Address translation and port translation |
| Health Monitors and Persistence | 20-25% | - Monitor types and configurations - Persistence profiles (Cookie, Source Address, Universal) - Fallback host and persistence TTL - Monitor assignment and interval settings - OneConnect and connection multiplexing |
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NEW QUESTION # 27
Application administrators are reporting that nodes different from those configured in the pool are selected.
The use of an iRule is suspected.
How can the BIG-IP Administrator check if an iRule is used for this traffic? (Choose two answers)
Answer: A,D
Explanation:
In BIG-IP systems, iRules influence traffic only when they are attached to a Virtual Server. If application traffic is being sent to nodes or pool members that are not defined in the pool, this typically indicates that an iRule is overriding the default load-balancing behavior by explicitly selecting a pool or node.
According to BIG-IP Administration: Data Plane Configuration and official F5 guidance:
* iRules are associated with Virtual Servers, not directly with pools or nodes.
* To determine whether an iRule is actively affecting traffic, the administrator must inspect the Virtual Server configuration.
Explanation of the correct answers:
* B. Via the GUI at the Resources tab for the virtual serverThe Resources tab in the Configuration Utility displays all traffic-handling objects applied to the Virtual Server, including assigned iRules. This is the primary GUI location to verify whether an iRule is influencing data plane traffic.
* C. Via TMSH with the list /ltm virtual <virtual_server> commandThis TMSH command displays the full Virtual Server configuration, including any iRules listed under the rules section. It is the authoritative CLI method to confirm iRule usage.
Why the other options are incorrect:
* A. Via TMSH with the list /ltm rule <irule> commandThis command only shows the contents of an iRule and does not indicate whether the iRule is attached to or used by any Virtual Server.
* D. Via the GUI at the iRule tab for the virtual serverBIG-IP does not provide a dedicated "iRule" tab on Virtual Servers. iRules are viewed and managed under the Resources tab.
Correct Conclusion:
To verify whether an iRule is responsible for unexpected node selection, the BIG-IP Administrator must examine the Virtual Server configuration, either through the Resources tab in the GUI or by using TMSH to list the Virtual Server configuration.
NEW QUESTION # 28
Refer to the exhibit.
DNS queries from two internal DNS servers are being load-balanced to external DNS servers via a virtual server on a BIG-IP device. The DNS queries originate from:
192.168.10.100
192.168.10.200
and target:
192.168.2.150
All DNS queries destined for the external DNS servers fail.
Which property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue?
(Choose one answer)
Answer: B
Explanation:
DNS traffic is primarily transported using UDP port 53. In the exhibit, the Virtual Server is configured with the Protocol set to TCP, which prevents standard DNS queries from being processed correctly. BIG-IP Virtual Servers must be configured with the correct Layer 4 protocol to match the application traffic they are handling.
According to the BIG-IP Administration: Data Plane Configuration documentation:
The Protocol setting on a Virtual Server defines whether traffic is processed as TCP, UDP, or another supported transport protocol.
Standard DNS queries and responses use UDP, while TCP is only required for DNS zone transfers (AXFR) or exceptionally large responses.
When a DNS Virtual Server is incorrectly configured with TCP, UDP-based DNS queries are dropped, causing all requests to fail.
Why the other options are incorrect:
A). Protocol profile (Client) to DNS_OPTIMIZEDA DNS profile enhances DNS functionality but does not correct an incorrect transport protocol configuration.
B). Type to Performance (HTTP)Performance (HTTP) Virtual Servers are designed for HTTP traffic and are not suitable for DNS services.
C). Source Address to 192.168.10.0/24The existing source IPs already fall within the allowed range, so this setting does not address the failure.
Correct Resolution:
Changing the Protocol to UDP aligns the Virtual Server with standard DNS transport requirements, allowing DNS queries to be successfully processed and load-balanced.
NEW QUESTION # 29
The BIG-IP Administrator has to provide encrypted communication between the users and the virtual server they access. Multiple hostnames are configured in DNS with the same IP address. Which profile type and setting in the profile should be used?
Answer: D
Explanation:
When a single IP address (Virtual Server) must host multiple hostnames (e.g., site1.com, site2.com) over HTTPS, the BIG-IP must be able to present the correct SSL certificate for each site during the initial handshake. This requirement is handled by a technology called Server Name Indication (SNI).
To implement this on the BIG-IP, the administrator must use a Client SSL profile because the encryption is occurring between the user (Client) and the Virtual Server. Within the Client SSL profile settings, there is a field called Server Name. By creating multiple Client SSL profiles-each with a different "Server Name" (the hostname) and its corresponding certificate-and attaching them all to the same Virtual Server, the BIG-IP can inspect the SNI extension in the client's "Client Hello" packet. It then selects the specific profile that matches the requested hostname.
Option A is incorrect because "Client Name" is not the standard field name used for SNI hostname matching in the profile. Options B and C refer to Server SSL profiles, which manage the connection between the BIG- IP and the backend servers. While Server SSL profiles also have a "Server Name" field (used to send SNI to a backend server), the requirement here is to provide encrypted communication for "users" accessing the virtual server, which definitively requires a Client-side SSL configuration.
NEW QUESTION # 30
The BIG-IP Administrator has to provide encrypted communication between users and the virtual server they access. Multiple hostnames are configured in DNS with the same IP address.
Which profile type and setting in the profile should be used? (Choose one answer)
Answer: D
Explanation:
When multiple hostnames resolve to the same IP address and encrypted communication is required, the BIG- IP must be able to present the correct SSL certificate based on the hostname requested by the client. This is accomplished using Server Name Indication (SNI).
According to BIG-IP Administration: Data Plane Configuration documentation:
* SNI is a client-side TLS extension, where the client includes the requested hostname during the SSL handshake.
* BIG-IP evaluates this hostname using the Client SSL profile, not the Server SSL profile.
* The "Server Name" setting in the Client SSL profile enables BIG-IP to select the appropriate SSL certificate for the requested hostname.
Why option C is correct:
* Client SSL profile handles inbound (client-side) encryption.
* Server Name enables SNI-based certificate selection when multiple DNS names share the same virtual server IP.
Why the other options are incorrect:
* A. Client SSL, Client NameThere is no Client SSL setting called Client Name for SNI certificate selection.
* B. Server SSL, Server NameServer SSL is used for encryption between BIG-IP and backend servers, not for client-side hostname identification.
* D. Server SSL, Client NameServer SSL does not process client-requested hostnames during TLS negotiation.
Correct Resolution:
Configure a Client SSL profile and enable the Server Name (SNI) setting to support multiple encrypted hostnames on the same virtual server IP.
NEW QUESTION # 31
A Standard Virtual Server for a web application is configured with SNAT Automap. The original client IP must be known by backend servers.
What should the BIG-IP Administrator configure?
Answer: C
Explanation:
X-Forwarded-For inserts the original client IP into HTTP headers while SNAT is enabled.
NEW QUESTION # 32
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