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NEW QUESTION # 19
A Standard Virtual Server is configured with SNAT Automap. Backend servers must see the original client IP.
What should be configured?
Answer: B
Explanation:
X-Forwarded-For inserts the original client IP into HTTP headers, preserving client identity while SNAT is enabled.
NEW QUESTION # 20
Exhibit:
Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile. Which persistence profile type should the BIG-IP Administrator use for this purpose?
Answer: C
Explanation:
In a BIG-IP environment, a Fallback Persistence Profile is utilized as a secondary "stickiness" mechanism when the primary (Default) persistence method fails to provide a valid persistence record. For example, if a Virtual Server uses HTTP Cookie Persistence as its primary method, but a client's browser has cookies disabled, the BIG-IP will be unable to find a persistence cookie in the request. Without a fallback method, the system would treat every request from that client as a new, independent connection, potentially breaking the application session.
Source Address Affinity (also known as Source Address Persistence) is the most common and standard choice for a fallback profile. It operates at the network layer (Layer 3) by tracking the client's source IP address.
Because every IP packet contains a source address, this method is virtually guaranteed to work even when application-layer data (like Cookies or SSL Session IDs) is missing or encrypted beyond the BIG-IP's visibility. While Universal (Option A) and Hash (Option D) profiles are highly flexible and can use iRules to persist on almost any data, they require specific configuration and logic that may not always be present or valid. SSL persistence (Option C) relies on the SSL Session ID, which frequently changes due to modern browser security practices (session renegotiation), making it less reliable than Source Address Affinity. By configuring Source Address Affinity as the fallback, the administrator ensures that the BIG-IP has a "safety net" to maintain session integrity based on the client's IP address when the more granular cookie-based persistence is unavailable.
NEW QUESTION # 21
A web server administrator informs the BIG-IP Administrator that web servers currently load-balanced require encrypted traffic. Starting next month, the web server administrator will offload SSL. Starting next month, the BIG-IP device will terminate SSL to reduce web server load. The BIG-IP device is already using Client SSL, Client port, and iRules on HTTP traffic. What actions should the BIG-IP Administrator take to achieve the desired configuration? (Choose one answer)
Answer: B
Explanation:
To solve this requirement, we must distinguish between the two "legs" of an SSL connection in a BIG-IP environment: Client-side and Server-side.
Current State (SSL Bridging): The administrator states the servers currently require encrypted traffic. This means the BIG-IP is likely performing "SSL Bridging." In this setup, a Client SSL profile terminates encryption from the user, and a Server SSL profile re-encrypts the traffic before sending it to the back-end servers.
Target State (SSL Offloading): The requirement is to "offload SSL" to reduce web server load. This means the BIG-IP will continue to handle the encryption for the users (keeping the Client SSL profile) but will communicate with the back-end servers using unencrypted HTTP.
Why Option A is correct:
Remove the Server SSL profile: By removing this profile, the BIG-IP stops attempting to initiate an SSL/TLS handshake with the pool members.
Configure Pool Members to use HTTP: The service port for the pool members must be changed (typically from port 443 to port 80) so that the BIG-IP sends standard HTTP traffic to the servers.
Why other options are incorrect:
B & D: These suggest removing the Client SSL profile. If you remove this, the users can no longer connect via HTTPS, which violates the requirement for encrypted communication between the users and the BIG-IP.
C: Changing the Virtual Server to accept HTTP traffic would mean the user-to-BIG-IP connection is no longer encrypted, which is the opposite of SSL termination/offloading.
NEW QUESTION # 22
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 192.168.101.100 and 192.168.101.200 and target
192.168.21.50 .
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?
Answer: B
Explanation:
The virtual server is configured for destination 192.168.21.50 , service port 53 , but its Protocol is TCP .
Standard DNS query traffic is normally sent using UDP port 53 . Because virtual-server traffic matching includes the configured IP protocol, UDP DNS packets will not match a virtual server configured exclusively for TCP, causing the queries to fail.
F5 ' s DNS configuration guidance explicitly instructs administrators creating a DNS query virtual server to configure service port 53 and select UDP as the protocol. F5 also recommends separate TCP and UDP virtual servers when both forms of DNS traffic must be supported; TCP port 53 is particularly relevant for operations such as DNS zone transfers.
Option C is not required. The existing source network 192.168.100.0/23 spans addresses from 192.168.100.0 through 192.168.101.255, so both 192.168.101.100 and 192.168.101.200 are already permitted by the source- address criterion. F5 documents that the Source Address setting can specify the network from which a virtual server accepts traffic.
Therefore, changing the virtual server ' s Protocol from TCP to UDP corrects the traffic-matching problem.
Reference Topics: Virtual Server traffic matching; Protocol selection; DNS over UDP/TCP; Source Address matching; Service Port 53.
NEW QUESTION # 23
A BIG-IP Administrator needs to modify a virtual server that will offload web traffic compression tasks from the target server. Which two profiles must the BIG-IP Administrator apply to a virtual server to enable compression? (Pick the 2 correct responses below)
Answer: C,D
Explanation:
HTTP Compression on a BIG-IP system is an optimization feature that reduces the size of HTTP responses sent to clients, thereby saving bandwidth and improving page load times for end-users. To implement this functionality on a Virtual Server, the system requires two specific profiles to work in tandem: an HTTP profile and a Compression profile.
The HTTP profile (Option E) is a prerequisite because compression is an application-layer (Layer 7) operation. The BIG-IP must be "HTTP-aware" to parse the incoming requests and outgoing responses. The HTTP profile allows the BIG-IP to inspect the Accept-Encoding header from the client (to see if the client supports gzip or deflate) and to modify the Content-Encoding and Vary headers in the server's response.
Without the HTTP profile, the Virtual Server operates at Layer 4 (TCP) and sees the traffic only as an opaque stream of bytes, making compression impossible.
The Compression profile (Option B) contains the actual settings and engine for the task. It defines which content types should be compressed (e.g., text/html, application/javascript), the compression level, and the minimum content length required before compression is applied. While a Stream profile (Option D) is used for data replacement (search and replace) and SSL profiles (Option C) are used for encryption, they do not provide compression logic. By applying both the HTTP and Compression profiles, the BIG-IP can successfully intercept server responses, compress the payload according to the configured policy, and deliver the optimized data to the user, effectively offloading the CPU-intensive compression work from the backend web servers.
NEW QUESTION # 24
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