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NEW QUESTION # 74
A BIG-IP Administrator configured the following virtual server to pass traffic on all addresses and ports.
After configuration is completed, the BIG-IP Administrator notices that the virtual server is unable to pass traffic.
ltm virtual forwarding_any_vs {
destination 0.0.0.0:any
ip-forward
mask 255.255.255.255
profiles {
fastL4 { }
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address disabled
translate-port disabled
}
Which part of the configuration is the cause of the issue? (Choose one answer)
Answer: B
Explanation:
This virtual server is intended to function as aforwarding (IP-forwarding) virtual server, which is commonly used for routing or firewall-style deployments where BIG-IP forwards traffic transparently without load balancing or address translation. For a forwarding virtual server to match and passall traffic, the destination must be configured as 0.0.0.0:anywith a mask of 0.0.0.0, not 255.255.255.255.
The configured mask 255.255.255.255 represents a/32 host mask, which restricts the virtual server to matching traffic destined only for the exact IP address 0.0.0.0. Since 0.0.0.0 is not a valid routable destination for normal traffic, no packets will ever match the virtual server, causing it to pass no traffic at all.
This is a well-documented BIG-IP behavior:
* destination 0.0.0.0:any
* mask 0.0.0.0
together define acatch-all forwarding virtual server.
The destination itself (Option A) is correct for a forwarding VS, and disabling address translation (Option C) is expected and required for IP-forwarding mode. Therefore, the incorrect subnet mask is the sole reason the virtual server is not functioning as expected.
NEW QUESTION # 75
Which command tests DNS resolution?
Answer: B
Explanation:
dig queries DNS servers and verifies resolution.
NEW QUESTION # 76
A user needs to determine known security vulnerabilities on an existing BIG-IP appliance and how to remediate these vulnerabilities. Which action should the BIG-IP Administrator recommend?
Answer: B
Explanation:
F5 recommends using the iHealth diagnostic tool to identify security vulnerabilities and receive specific remediation guidance.
* QKView and iHealth: A QKView file is a comprehensive diagnostic snapshot of the BIG-IP system.
When this file is uploaded to the F5 iHealth portal, it is automatically parsed against a database of known issues and security advisories.
* Vulnerability Diagnosis: The iHealth platform includes automated checks specifically designed to surface security gaps and "Heuristics" that match the system's current configuration and software version to known CVEs (Common Vulnerabilities and Exposures).
* Remediation Guidance: For every identified vulnerability, iHealth provides direct links to the relevant F5 Security Advisory (K-article), which contains detailed remediation steps, such as specific software versions that contain a fix or temporary mitigation commands.
* UCS vs. QKView: While a UCS (User Configuration Set) file is a backup of the system configuration, it is not the format used by the iHealth diagnostic engine for automated vulnerability scanning; the QKView is the required format for this process.
NEW QUESTION # 77
A BIG-IP Administrator needs to view the CPU utilization of a particular Virtual Server. Which section of the Configuration Utility should the administrator use for this purpose?
Answer: A
Explanation:
When a BIG-IP system experiences high overall CPU usage, troubleshooting requires identifying which specific application or service is the primary consumer of resources. While the system-wide performance graphs provide a global view, the granular data necessary to isolate a "top talker" is found in the "Local Traffic" statistics. Navigating to Statistics > Module Statistics > Local Traffic > Virtual Servers allows the administrator to see specific metrics for each configured virtual server, including the number of packets processed, current connections, and critical CPU cycles consumed. This is essential for troubleshooting performance issues where an inefficient iRule, high SSL handshake volume, or complex L7 profiles (like Compression or ASM) might be overtaxing the Traffic Management Microkernel (TMM) for one specific application. By reviewing these basic stats, an administrator can determine if a performance bottle-neck is a system-wide h1ardware issue or if it is isolated to a single virtual server, enabling targeted remediation such as optimizing iRule logic or moving the high-load virtual server to a dedicated device.
NEW QUESTION # 78
Without decrypting, what portion of an HTTPS session is visible with a packet capture? (Choose one answer)
Answer: C
Explanation:
In an HTTPS session, the application-layer payload--including HTTP request headers, response headers, cookies, and body content--is encrypted using SSL/TLS. Without decrypting the traffic (for example, without SSL offloading on BIG-IP or access to the private keys), a packet capture cannot reveal any HTTP-level details.
However, network-layer and transport-layer information remains visible, even when encryption is used. This includes source and destination IP addresses, source and destination ports, TCP flags, sequence numbers, and TLS handshake metadata. Therefore, thesource IP address (Option B) is visible in a packet capture of HTTPS traffic without decryption.
NEW QUESTION # 79
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