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| Section | Weight | Objectives |
|---|---|---|
| SSL/TLS Configuration | 15-20% | - SSL termination and re-encryption - SSL profiles (Client and Server) - Certificate validation settings - Cipher groups and compatibility - Certificate and key management |
| Health Monitors and Persistence | 20-25% | - Fallback host and persistence TTL - Monitor assignment and interval settings - OneConnect and connection multiplexing - Persistence profiles (Cookie, Source Address, Universal) - Monitor types and configurations |
| Traffic Management Features | 15-20% | - Connection limits and rate shaping - iRules basics and events - NAT and SNAT concepts - HTTP profile settings - OneConnect - Compression and caching profiles |
| LTM Fundamentals | 15-20% | - Configuration architecture and files - Traffic Management Shell (tmsh) CLI - Objects and their relationships - Licensing types - License and provisioning modules |
| Virtual Servers and Pools | 25-30% | - Pool configuration and members - Address translation and port translation - Priority group activation - Virtual server configuration options - Node and pool management - Virtual server types (Standard, Forwarding, Performance L4, Regex) - Load balancing algorithms |
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29. Frage
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)
Antwort: D
Begründung:
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.
30. Frage
To increase available bandwidth of an existing Trunk, the BIG-IP Administrator is adding additional interfaces. Which command should the BIG-IP Administrator run from within the bash shell?
Antwort: A
Begründung:
This question tests precise knowledge of both TMSH command syntax and BIG-IP object namespace hierarchy . Two critical distinctions must be correctly identified:
1. create vs. modify: Since the Trunk already exists and the administrator is adding interfaces to it, the correct verb is modify - not create . Using create on an existing object would either throw an error or attempt to overwrite the object entirely, neither of which is the desired outcome.
2. /sys vs. /net namespace: Trunk objects in BIG-IP reside within the /net namespace, which encompasses network-layer constructs including Trunks, VLANs, Self IPs, and Routes. The /sys namespace is reserved for system-level objects such as management settings, software, and licensing - it does not contain Trunk objects.
Therefore, the only syntactically and functionally correct command is:
tmsh modify /net trunk trunk_A interfaces add {1.3 1.4}
This command appends interfaces 1.3 and 1.4 to the existing trunk_A object without disrupting currently assigned interfaces, increasing aggregated bandwidth accordingly.
Options A and C use the incorrect /sys namespace, and options A and B incorrectly use the create verb for an existing object.
Reference: BIG-IP Administration - Data Plane Configuration, Module: TMSH Command Syntax - Network Object Management.
31. Frage
During a high-demand event, the BIG-IP Administrator needs to limit the number of new connections per second to a Virtual Server.
What should be applied?
Antwort: C
Begründung:
Connection rate limits restrict how many new connections are accepted per second, protecting application resources.
32. Frage
A Standard Virtual Server for a web application is configured with Automap for the Source Address Translation option. The original source address of the client must be known by the backend servers. What should the BIG-IP Administrator configure to meet this requirement?
Antwort: B
Begründung:
SNAT Automap is a common configuration that replaces the client ' s original source IP address with one of the BIG-IP ' s self IP addresses. This ensures that the backend servers send return traffic back through the BIG-IP, which is necessary for the ADC to process the traffic correctly. However, a side effect of SNAT is that the backend servers only see the BIG-IP ' s IP in their logs, losing visibility into the true identity of the client.
To resolve this while still using SNAT for routing purposes, the administrator must configure the BIG-IP to " pass " the client ' s IP address at the application layer. This is achieved by using an HTTP Profile with the Insert X-Forwarded-For setting enabled. When this profile is applied to the Virtual Server, the BIG-IP intercepts the HTTP request, adds a header (X-Forwarded-For) containing the client ' s original IP, and then forwards the modified request to the server. The backend web server can then be configured to read this header and log the original client IP instead of the BIG-IP ' s SNAT address.
Other options are incorrect for this requirement. Performance (HTTP) (Option A) is a virtual server type optimized for speed but often lacks the full Layer 7 header manipulation capabilities of a Standard Virtual Server. SNAT Pool with the client IP (Option C) is technically impossible as SNAT pools use static, pre- defined IPs. There is no such thing as an HTTP Transparent profile (Option D) in standard BIG-IP administration for this purpose. The X-Forwarded-For header insertion within the HTTP profile is the standard procedural method for maintaining client visibility in SNAT-enabled environments.
33. Frage
The BIG-IP Administrator needs to load balance a pool of web servers. Load balancing should consider the number of connections that are active on that pool member.
Which load balancing method meets this requirement? (Choose one answer)
Antwort: B
Begründung:
The requirement states that load balancing decisions must be based on the number of active connections on each pool member. This directly maps to the Least Connections (member) load balancing method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Least Connections (member) selects the pool member with the fewest active connections at the time of the request.
* This method dynamically adapts to real-time traffic patterns and ensures that more heavily loaded pool members receive fewer new connections.
* It is especially effective for web servers where connection duration may vary and equal distribution of active sessions is desired.
Why the other options are incorrect:
* B. Round RobinDistributes connections sequentially without considering current load or active connections.
* C. Ratio (member)Distributes traffic based on static ratios, not real-time connection counts.
* D. Ratio (node)Uses predefined ratios at the node level and does not account for active connection counts.
Correct Resolution:
Using Least Connections (member) ensures that new connections are directed to the pool member currently handling the fewest active connections, meeting the stated requirement.
34. Frage
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