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BIG-IP Administration Support and Troubleshooting (F5CAB5) exam Question and Answers

BIG-IP Administration Support and Troubleshooting (F5CAB5) exam

Last Update Mar 31, 2026
Total Questions : 65

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Questions 1

Users are unable to reach an application. The BIG-IP Administrator checks the Configuration Utility and observes that the Virtual Server has a red diamond in front of the status. What is causing this issue?

Options:

A.  

All pool members are down.

B.  

The Virtual Server is receiving HTTPS traffic over HTTP virtual.

C.  

The Virtual Server is disabled.

D.  

All pool members have been disabled.

Discussion 0
Questions 2

Exhibit:

A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, traffic was not evenly distributed and the pool member 172.16.20.3 received more traffic than the other pool members.

Refer to the exhibit and the virtual server configuration provided below:

Plaintext

ltm virtual http.vs {

destination 10.10.1.100:http

ip-protocol tcp

mask 255.255.255.255

persist {

source_addr { default yes }

}

pool http.pool

profiles {

tcp{}

}

serverssl-use-sni disabled

source 0.0.0.0/0

source-address-translation {

type automap

}

translate-address enabled

}

What is the most likely cause of this behavior?

Options:

A.  

Automap source address translation can cause uneven load balancing

B.  

Pool members' ratio settings are causing the uneven traffic distribution

C.  

Round Robin requires an HTTP profile to work efficiently

D.  

A persistence profile assigned to the virtual server can cause uneven load balancing

Discussion 0
Questions 3

A Virtual Server uses an iRule to send traffic to pool members depending on the URI. The BIG-IP Administrator needs to modify the pool member in the iRule. Which event declaration does the BIG-IP Administrator need to change to accomplish this?

Options:

A.  

CLIENT_ACCEPTED

B.  

HTTP_RESPONSE

C.  

HTTP_REQUEST

D.  

SERVER_CONNECTED

Discussion 0
Questions 4

Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status from RED to GREEN?

Options:

A.  

/var/log/audit

B.  

/var/log/ltm

C.  

/var/log/lastlog

D.  

/var/log/monitors

Discussion 0
Questions 5

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?

Options:

A.  

Statistics > Module Statistics > Local Traffic > Virtual Addresses

B.  

Statistics > Module Statistics > Traffic Summary

C.  

Statistics > Analytics > Process CPU Utilization

D.  

Statistics > Module Statistics > Local Traffic > Virtual Servers

Discussion 0
Questions 6

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.

Plaintext

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?

Options:

A.  

Incorrect translate-address configured

B.  

Incorrect mask 255.255.255.255

C.  

Incorrect destination configured

Discussion 0
Questions 7

A BIG-IP Administrator receives reports from users that SSL connections to the BIG-IP device are failing. Upon checking the log files, the administrator notices: SSL transaction (TPS) rate limit reached. stats show a maximum of 1200 client-side SSL TPS and 800 server-side SSL TPS. What is the minimum SSL license limit required to handle this peak?

Options:

A.  

2000

B.  

400

C.  

800

D.  

1200

Discussion 0
Questions 8

A BIG-IP Administrator is receiving intermittent reports from users that SSL connections to the BIG-IP device are failing. Upon checking the log files, the administrator notices: SSL transaction (TPS) rate limit reached. Reviewing stats shows a max of 1200 client-side SSL TPS and 800 server-side SSL TPS. What is the minimum SSL license limit capacity required to handle this peak?

Options:

A.  

2000

B.  

400

C.  

800

D.  

1200

Discussion 0
Questions 9

Clients report that they cannot reach the virtual server vs-production on port 80, but are able to ping the virtual server address. The configuration is shown below:

Plaintext

ltm virtual vs-production {

destination 10.99.20.50:http

ip-protocol tcp

mask 255.255.255.255

profiles {

http {}

tcp {}

}

source 192.168.0.0/16

translate-address enabled

translate-port enabled

vlans {

external

}

vlans-enabled

}

What is the cause?

Options:

A.  

The virtual server is disabled.

B.  

The client uses an old browser.

C.  

The virtual server does NOT listen on port 80.

D.  

The client comes from an unallowed subnet.

Discussion 0
Questions 10

Refer to the exhibit. A BIG-IP Administrator creates a new Virtual Server to load balance SSH traffic. Users are unable to log on to the servers. What should the BIG-IP Administrator do to resolve the issue? (Exhibit shows a Standard Virtual Server with an HTTP profile applied).

Options:

A.  

Set Protocol to UDP8

B.  

Set HTTP Profile to None9

C.  

Set Source Address to 10.1.1.210

D.  

Set Destination Addresses/Mask to 0.0.0.0/011

Discussion 0
Questions 11

A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, the virtual server failed to respond to http requests.

Plaintext

ltm virtual http.vs {

destination 10.10.1.100:http

ip-protocol tcp

mask 255.255.255.255

pool http.pool

profiles {

tcp{}

}

serverssl-use-sni disabled

source 0.0.0.0/0

translate-address enabled

translate-port enabled

}

ltm pool http_pool {

members {

10.10.1.101:http {

address 10.10.1.101

session monitor-enabled

state checking

}

10.10.1.102:http {

address 10.10.1.102

session monitor-enabled

state checking

}

}

monitor tcp

}

What configuration change on the BIG-IP will resolve this issue?

Options:

A.  

Add SNAT Auto Map

B.  

Add http profile

C.  

Add http monitor

Discussion 0
Questions 12

A BIG-IP Administrator needs to collect HTTP status code and HTTP method for traffic flowing through a virtual server.

Which default profile provides this information? (Choose one answer)

Options:

A.  

Request Adapt

B.  

HTTP

C.  

Analytics

D.  

Statistics

Discussion 0
Questions 13

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?

Options:

A.  

The Virtual Server type as Performance (HTTP)

B.  

An HTTP profile to insert the X-Forward-For header

C.  

An HTTP Transparent profile

D.  

A SNAT Pool with the client IP

Discussion 0
Questions 14

A set of servers is used for an FTP application as well as an HTTP website via separate BIG-IP Pools. The server support team reports that some servers are receiving a lot more traffic than others. Which Load Balancing Method should the BIG-IP Administrator apply to even out the connection count?

Options:

A.  

Ratio (Member)

B.  

Least Connections (Member)

C.  

Least Connections (Node)

D.  

Ratio (Node)

Discussion 0
Questions 15

The BIG-IP Administrator is investigating disk utilization on the BIG-IP device. (Exhibit shows /dev/md4 mounted on / at 100% utilization). What should the BIG-IP Administrator check next?

Options:

A.  

Large files on the / file system

B.  

Results from the EUD test

C.  

Results from the platform diagnostics test

D.  

Large files on /usr file system

Discussion 0
Questions 16

Refer to the exhibit.

A pool member fails the monitor checks for about 30 minutes and then starts passing the monitor checks. New traffic is NOT being sent to the pool member. What is the likely reason for this problem? (Choose one answer)

Options:

A.  

Manual resume is enabled.

B.  

Time Until Up is zero.

C.  

The pool member is disabled.

D.  

Monitor Type is TCP Half Open.

Discussion 0
Questions 17

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?

Options:

A.  

Change Source Address to 104.219.110.168/32

B.  

Change Load Balancing Method to Least Connection

C.  

Change Fallback Persistence Profile to source_addr

D.  

Change Default Persistence Profile to cookie

Discussion 0
Questions 18

A BIG-IP Administrator observes the following pool member status message:

Pool /Common/testpool member /Common/10.120.0.5:8090 monitor status down

[/Common/http: up, /Common/http2: down; last error:]

Why is this pool member being marked down? (Choose one answer)

Options:

A.  

The pool member is currently only serving HTTP traffic.

B.  

The pool member is currently only serving TCP traffic.

C.  

The pool member is currently only serving UDP traffic.

D.  

The pool member is currently only serving HTTPS traffic.

Discussion 0
Questions 19

Refer to the exhibit.

A user with IP address 192.168.162.70 is unable to connect to an HTTP application. What is a possible cause within the Virtual Server configuration?

Options:

A.  

The Service Port is configured as 0 *All Ports

B.  

The Destination Address is configured as 192.168.162.80

C.  

The Virtual Server is configured as a Standard Type

D.  

The Source Address is configured as 10.128.10.0/24

Discussion 0