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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration: Install, Initial Configuration, and Upgrade |
| Exam Number: | F5CAB1 |
| Exam Format: | Multiple Choice |
| Related Certifications: | F5 Certified BIG-IP Administrator F5 Certified Technology Specialist (LTM) |
| Available Languages: | English |
| Recommended Training: | F5 LTM Essentials Training F5 BIG-IP Administration Fundamentals Course |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB1 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge (TCP/IP, routing concepts) recommended |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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NEW QUESTION # 50
The BIG-IP Administrator needs to update access to the Configuration Utility to include the
172.28.31.0/24 and 172.28.65.0/24 networks. From the TMOS Shell (tmsh), which command should the BIG-IP Administrator use to complete this task?
Answer: C
Explanation:
Access to the BIG-IP Configuration Utility (TMUI) is controlled through the /sys httpd allow list.
This list defines which IP addresses or subnets are allowed to connect to the management web interface.
To allow two new subnets--172.28.31.0/24 and 172.28.65.0/24--the administrator must add both subnets to the existing list without removing current entries.
In tmsh, subnet entries must be specified in network/netmask format, for example:
172.28.31.0/255.255.255.0
The correct tmsh command to append these networks is:
modify /sys httpd allow add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
NEW QUESTION # 51
The BIG-IP Administrator received a ticket that an authorized user is attempting to connect to the Configuration Utility from a jump host and is being denied.
The HTTPD allow list is configured as:
sys httpd {
allow { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
}
The jump host IP is172.28.32.22.
What command should the BIG-IP Administrator use to allow HTTPD access for this jump host?
Answer: A
Explanation:
The HTTPD allow list controls which IP addresses or subnets may access the Configuration Utility (TMUI) on the BIG-IP system. The Administrator already has two subnets allowed and needs to add asingle host IPto the existing list.
* The object/sys httpd allowsupports actions such asadd,delete, andreplace-all-with.
* Because the goal is toaddone more entry without removing the existing permitted subnets, the correct command is:
modify /sys httpd allow add { 172.28.32.22 }
This appends the new host to the existing list while preserving the previously configured networks.
Why the other options are incorrect:
* Option A (replace-all-with)wouldoverwritethe entire allow list, removing existing permitted subnets- unacceptable.
* Option B (delete)wouldremovethe existing networks and not add the required host.
Therefore, the correct administrative action is toaddthe jump host's IP.
NEW QUESTION # 52
How should the BIG-IP Administrator block connections to a Self IP on port 443 while allowing connections to other ports?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration - Install, Initial Configuration, and Upgrade:
BIG-IP Self IP addresses have an associated Port Lockdown feature that governs which protocols and services are permitted to communicate directly with that Self IP. By default, Self IPs may allow broader access than desired, making Port Lockdown a critical hardening control.
The Allow Custom option under Port Lockdown is the precise mechanism for administrators who need granular, port-specific filtering. When selected, only the explicitly listed TCP/UDP ports are permitted - all others, including port 443 (HTTPS), are implicitly denied. This satisfies the requirement of blocking 443 specifically while preserving access on other required ports.
The remaining options are incorrect for this scenario:
* Option A references SSH access control under System > Platform, which governs management-plane SSH - not Self IP service filtering.
* Option B disables the entire Self IP, removing all traffic handling, which is operationally disruptive.
* Option D - Allow None - blocks all traffic to the Self IP, not selectively port 443.
The Allow Custom approach provides the surgical precision required: administrators enumerate permitted ports, and everything outside that list - including 443 - is dropped.
Reference Topics: Self IP Port Lockdown, Network Security Hardening, Self IP Configuration - BIG-IP Administration Study Guide.
NEW QUESTION # 53
A BIG-IP Administrator needs to verify the state of equipment in the data center.
A BIG-IP appliance has a solid yellow indicator on the status LED.
How should the administrator interpret this LED indicator?
Answer: B
NEW QUESTION # 54
An administrator is in the process of reactivating the license using the interface displayed in the exhibit.
What is the address of the license server to which the BIG-IP device must be able to establish an outbound connection in order to use the Automatic Activation Method ?
Answer: B
Explanation:
When you choose Automatic as the activation method in the License > Re-activate screen, the BIG-IP device itself contacts F5's license activation service over the Internet.
For successful automatic activation:
* The BIG-IP must have outbound network connectivity (typically via the management interface).
* DNS resolution and routing must allow it to reach the F5 license activation host (the one shown in option D).
* The device sends its dossier and registration key to that service and receives an updated license file in return, which is then installed automatically.
The other hostnames in the options are not used by BIG-IP for license activation, so they cannot be correct in the context of Automatic Activation .
NEW QUESTION # 55
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