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NEW QUESTION # 13
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: C,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 server
The 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> command
This 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> command
This 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 server
BIG-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 # 14
A BIG-IP Administrator adds new pool members into an existing, highly utilized pool. Soon after, there are reports that the application is failing to load for some users.
What pool-level setting should the BIG-IP Administrator check?
Answer: B
Explanation:
Slow Ramp Time prevents new pool members from receiving a full share of traffic immediately, allowing applications to warm up gradually.
NEW QUESTION # 15
What would be the best persistence method for F5 to load balance traffic from clients via a single source IP (NAT) to multiple pool members with even distribution for an HTTPS web application?
Answer: B
Explanation:
When clients connect through a single source IP (NAT) - such as a corporate proxy or carrier-grade NAT
- Source Address Affinity persistence becomes entirely ineffective because all clients share an identical source IP address. This would force every client session to the same pool member, completely eliminating even distribution and defeating the purpose of load balancing.
Cookie Persistence is the optimal solution in this scenario because it operates at Layer 7 , inserting a unique cookie into each client ' s HTTP/HTTPS response. Each individual browser session carries its own distinct cookie value, allowing the BIG-IP to identify and persist individual clients to specific pool members - regardless of whether they share a common source IP address. This guarantees both session persistence and even load distribution across pool members.
The remaining options are unsuitable because:
* Destination Address Affinity persists based on destination IP, irrelevant for client-to-server session stickiness.
* SSL Persistence uses the SSL Session ID for persistence, but SSL session IDs are frequently renegotiated and are unreliable for long-term persistence across modern TLS implementations.
* Source Address Affinity fails entirely under NAT conditions as described.
Cookie persistence is the industry-standard method for HTTPS application load balancing requiring per-client session affinity.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Persistence Methods - Cookie, Source Address, and SSL Persistence.
NEW QUESTION # 16
Refer to the exhibit.
The BIG-IP Administrator has configured an HTTP health monitor and applied it to a pool of HTTP web servers that host the website www.f5.com , but all pool members show a "DOWN" status. From the monitor logging on the LTM, the BIG-IP Administrator notices that the web server is returning a response of "400 Bad Request." What would be the correct monitor Send string?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Configuration
/Course Guide/topics:
The monitor is explicitly sending an HTTP/1.1 request. For HTTP/1.1, the request must contain a valid Host header identifying the intended virtual host. The configured monitor sends the URI and Connection: Close header but omits Host: www.f5.com. A web server using name-based virtual hosting can therefore reject the request with HTTP 400 Bad Request , which explains why every pool member is marked down.
F5 ' s official BIG-IP monitor documentation gives the HTTP/1.1 convention in the form " GET / HTTP/1.
1\r\nHost: server.com\r\nConnection: close\r\n\r\n " .
Option A follows that required structure: the request line identifies HTTP/1.1, Host: www.f5.com selects the correct hosted site, Connection: Close requests connection termination after the response, and the final \r\n\r\n properly terminates the HTTP header section. F5 also specifies that when HTTP/1.0 or HTTP/1.1 is used, the monitor evaluates the HTTP status code; a non-200 response such as 400 causes the monitored resource to be considered unavailable.
Reference Topics: BIG-IP LTM Monitors Reference # HTTP Monitor Send String , HTTP/1.1 request formatting , pool-member health monitoring .
NEW QUESTION # 17
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 # 18
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