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  1. Home
  2. F5 Certification
  3. F5CAB5 Exam
  4. F5.F5CAB5.v2026-07-18.q66 Dumps
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Question 56

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?

Correct Answer: A
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Question 57

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)

Correct Answer: B
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.
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Question 58

Refer to Exhibit:

An organization is reporting slow performance accessing their Intranet website, hosted in a public cloud. All employees use a single Proxy Server with the public IP of 104.219.110.168 to connect to the Internet. What should the BIG-IP Administrator of the Intranet website do to fix this issue?

Correct Answer: D
This scenario describes a classic network performance issue known as the "Mega-Proxy" problem. When an organization routes all employee traffic through a single proxy server, the BIG-IP sees thousands of unique users as having the exact same source IP address. If the administrator has configured "Source Address Affinity" persistence, the BIG-IP will correctly follow the rule but incorrectly route all users to the same single backend pool member. This creates a severe load imbalance where one server is overwhelmed while others remain idle, leading to poor application response times. To resolve this, the administrator must change the persistence profile to "HTTP Cookie". Cookie-based persistence allows the BIG-IP to place a unique identifier in each user's browser, allowing the system to distinguish between individual sessions even if they share the same source IP. This fix ensures that traffic is distributed evenly across the pool members, restoring4 the expect5ed load balancing functionality and resolving the slow performance reported by users behind the corporate proxy.
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Question 59

A BIG-IP device sends out the following SNMP trap: big-ipo.f5.com - bigipExternalLinkChange Link: 1.0 is DOWN. Where in the BIG-IP Configuration utility should the BIG-IP Administrator verify the current status of Link 1.0?

Correct Answer: D
Identifying network-level performance issues often starts with investigating hardware-level alerts78. In F5 terminology, a "Link" like "1.0" or "1.1" refers to a physical interface on the appliance79. When an SNMP trap reports that a link is "DOWN," it indicates a loss of signal or an administrative shutdown of the physical port80. To verify this, the administrator must navigate to Network > Interfaces > Interface List81. This screen provides real-time status, showing whether the interface is "up," "down," or "uninitialized," as well as any media speed or duplex mismatches that could be causing performance degradation82. Troubleshooting this is the first step in resolving "pool member down" or "VLAN failsafe" issues, as a down interface will take down any VLANs associated with it, immediately halting all traffic flow for the services relying on that physical path.
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Question 60

Refer to the exhibit. An LTM device has a virtual server mapped to www.f5.com . Users report that when they connect to www.f5.com they are unable to receive content. What is the likely cause of the issue? (Choose one answer)

Correct Answer: B
Based on the configuration screens provided in the exhibit, the primary reason for the connectivity failure is the disabled ARP setting on the Virtual Address.
Virtual Address ARP Setting: In a standard BIG-IP deployment, the Address Resolution Protocol (ARP) must be enabled for the Virtual Address (192.168.238.111 in this case). When enabled, the BIG-IP system responds to ARP requests from the local network gateway or adjacent devices for that specific IP address.
Exhibit Analysis: Looking at the "Virtual Address List >> 192.168.238.111" properties section, the ARP checkbox is unselected (unchecked). Because ARP is disabled, the upstream router or client cannot resolve the MAC address for 192.168.238.111, and the traffic never reaches the BIG-IP LTM.
Availability Indicators: Note the yellow circle (status indicator) on both the Virtual Server and the Pool Members. In F5 BIG-IP, a yellow status typically indicates that the object is "Available" (Enabled) but its monitors are not currently identifying it as "Up" (which would be a green circle), or it is in a "Monitor Unknown" state. However, even if a pool is available, the traffic must first reach the Virtual Server, which is prevented here by the lack of ARP.
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