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LTM Specialist: Maintain & Troubleshoot Question and Answers

LTM Specialist: Maintain & Troubleshoot

Last Update May 9, 2024
Total Questions : 209

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Questions 1

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

An LTM Specialist is upgrading the LTM devices.

Which device should be upgraded first?

Options:

A.  

Device A

B.  

Device B

C.  

Device C

D.  

Device D

Discussion 0
Questions 2

An F5 LTM Specialist needs to perform an LTM device configuration backup prior to RMA swap.

Which command should be executed on the command line interface to create a backup?

Options:

A.  

bigpipe config save /var/tmp/backup.ucs

B.  

tmsh save /sys ucs /var/tmp/backup.ucs

C.  

tmsh save /sys config /var/tmp/backup.ucs

D.  

tmsh save /sys config ucs /var/tmp/backup.ucs

Discussion 0
Questions 3

An LTM Specialist is running the following packet capture on an LTM device:

ssldump -Aed -ni vlan301 'port 443'

Which two SSL record message details will the ssldump utility display by default? (Choose two.)

Options:

A.  

HTTP Version

B.  

User-Agent

C.  

ClientHello

D.  

ServerHello

E.  

Issuer

Discussion 0
Questions 4

An LTM Specialist is customizing local traffic logging.

Which traffic management OS alert level provides the most detail?

Options:

A.  

Alert

B.  

Notice

C.  

Critical

D.  

Emergency

E.  

Informational

Discussion 0
Questions 5

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

After upgrading LTM from v10 to v11, users are unable to connect to an application. The virtual server is using a client SSL profile for re-terminating SSL for payload inspection, but a server SSL profile is being used to re-encrypt the request.

A client side ssldump did NOT show any differences between the traffic going directly to the server and the traffic being processed by the LTM device. However, packet capture was done on the server, and differences were noted.

Which modification will allow the LTM device to process the traffic correctly?

Options:

A.  

Enable Strict Resume.

B.  

Change Secure Renegotiation to "Request."

C.  

Enable ProxySSL option in the server SSL profile.

D.  

Change to different ciphers on the server SSL profile.

Discussion 0
Questions 6

An HA pair of LTM devices configured in Active-Standby mode stops responding to traffic and causes an outage. The Active device becomes Standby, but the partner device stays in Standby mode instead of taking over as Active. A reboot and restart of the services brings the LTM device to Active mode for a short time, but then it goes into Standby mode again.

Which two configuration components caused this condition? (Choose two.)

Options:

A.  

VLAN Fail-safe

B.  

System Fail-safe

C.  

Gateway Fail-safe

D.  

Switch Board Failure

E.  

Link down on Failover

Discussion 0
Questions 7

What is the effect of an iRule error such as referencing an undefined variable?

Options:

A.  

The iRule execution will continue with the next statement.

B.  

The execution of the current event within the iRule will be terminated.

C.  

The iRule execution will be terminated, and both the client and server side connections will be reset.

D.  

The connection will continue, but the iRule will NOT be executed again for the lifetime of the connection.

Discussion 0
Questions 8

An application is configured on an LTM device:

Virtual server: 10.0.0.1:80 (VLAN vlan301)

SNAT IP: 10.0.0.1

Pool members: 10.0.1.1:8080, 10.0.1.2:8080, 10.0.1.3:8080 (VLAN vlan302)

Which packet capture should the LTM Specialist perform on the LTM device command line interface to capture only client traffic specifically for this virtual server?

Options:

A.  

tcpdump -ni 0.0:nnn -s 0 'host 10.0.0.1' -w /var/tmp/trace.cap

B.  

tcpdump -ni vlan301 -s 0 'port 80 and host 10.0.0.1' -w /var/tmp/trace.cap

C.  

tcpdump -ni vlan301 -s 0 'port 8080 and host 10.0.1.1 or host 10.0.1.2 or host 10.0.1.3' -w /var/tmp/trace.cap

D.  

tcpdump -ni vlan302 -s 0 'port 8080 and host 10.0.1.1 or host 10.0.1.2 or host 10.0.1.3' -w /var/tmp/trace.cap

E.  

tcpdump -ni 0.0:nnn -s 0 '(port 80 and host 10.0.0.1) or (port 8080 and host 10.0.1.1 or host 10.0.1.2 or host 10.0.1.3)' -w /var/tmp/trace.cap

Discussion 0
Questions 9

Which command should an LTM Specialist use on the command line interface to show the health of RAID array hard drives?

Options:

A.  

tmsh show /sys raid disk

B.  

tmsh show /ltm raid disk

C.  

tmsh show /sys raid status

D.  

tmsh show /ltm disk status

Discussion 0
Questions 10

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

Every monitor has the same Send String, Recv String, and an Alias of *:*. The LTM Specialist simplifies the configuration to minimize the number of monitors.

How many unique monitors remain?

Options:

A.  

1

B.  

2

C.  

3

D.  

4

E.  

5

Discussion 0
Questions 11

An IT administrator wants to log which server is being load balanced to by a user with IP address 10.10.10.25.

Which iRule should the LTM Specialist use to fulfill the request?

Options:

A.  

when SERVER_CONNECTED {

if { [IP::addr [IP::remote_addr]] equals 10.10.10.25]} {

log local0. "client 10.10.10.25 connected to pool member [IP::addr [LB::server addr]]" }

}

B.  

when CLIENT_ACCEPTED {

if { [IP::addr [clientside [IP::remote_addr]] equals 10.10.10.25]} {

log local0. "client 10.10.10.25 connected to pool member [IP::addr [LB::server addr]]" }

}

C.  

when SERVER_CONNECTED {

if { [IP::addr [clientside [IP::remote_addr]] equals 10.10.10.25]} {

log local0. "client 10.10.10.25 connected to pool member [IP::addr [LB::server addr]]" }

}

D.  

when CLIENT_ACCEPTED {

if { [IP::addr [IP::remote_addr] equals 10.10.10.25]} {

log local0. "client 10.10.10.25 connected to pool member [IP::addr [LB::server addr]]" }

}

Discussion 0
Questions 12

Users in a branch office are reporting a website is always slow. No other users are experiencing the problem. The LTM Specialist tests the website from the external VLAN along with testing the servers directly. All tests indicate normal behavior. The environment is a single HTTP virtual server on the external VLAN with a single pool containing three HTTP pool members on the internal VLAN.

Which two locations are most appropriate to collect additional protocol analyzer data? (Choose two.)

Options:

A.  

a user's machine

B.  

the switch local to the user

C.  

the LTM device's internal VLAN

D.  

the LTM device's external VLAN

E.  

a user's Active Directory authentication

Discussion 0
Questions 13

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

A user is unable to access a secure application via a virtual server.

What is the cause of the issue?

Options:

A.  

The client authentication failed.

B.  

The virtual server does NOT have a pool configured.

C.  

The client and server CANNOT agree on a common cipher.

D.  

The virtual server does NOT have a client SSL profile configured.

Discussion 0
Questions 14

A stand-alone LTM device is to be paired with a second LTM device to create an active/standby pair. The current stand-alone LTM device is in production and has several VLANs with floating IP addresses configured. The appropriate device service clustering (DSC) configurations are in place on both LTM devices.

Which two non-specific DSC settings should the LTM Specialist configure on the second LTM device to ensure no errors are reported when attempting to synchronize for the first time? (Choose two.)

Options:

A.  

pools

B.  

VLANs

C.  

default route

D.  

self IP addresses

Discussion 0
Questions 15

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

An LTM Specialist has configured a virtual server to distribute connections to a pool of application servers and to offload SSL processing. The application fails to work as expected when connecting to the virtual server. It does work when clients connect directly to the application. Two packet captures were taken at the application server.

What is the root cause of the problem?

Options:

A.  

The application servers are NOT listening on port 80.

B.  

The LTM device is sending non-SSL traffic to an SSL port.

C.  

The virtual server does NOT have a clientSSL profile assigned.

D.  

The SSL handshake between the LTM device and the server is failing.

Discussion 0
Questions 16

An LTM Specialist configures a new HTTP virtual server on an LTM device external VLAN. The web servers are connected to the LTM device internal VLAN. Clients trying to connect to the virtual server are unable to establish a connection. A packet capture shows an HTTP response from a web server to the client and then a reset from the client to the web server.

From which two locations could the packet capture have been collected? (Choose two.)

Options:

A.  

network interface of web server

B.  

network interface of client machine

C.  

internal VLAN interface of the LTM device

D.  

external VLAN interface of the LTM device

E.  

management VLAN interface of the LTM device

Discussion 0
Questions 17

Which command line interface command will check if the BIG-IP platform contains a packet velocity ASIC (PVA)?

Options:

A.  

bigpipe platform show | grep -i pva

B.  

tmsh show /sys hardware pva status

C.  

tmsh show /sys hardware | grep -i pva

D.  

tmsh show /ltm hardware | grep -i pva

Discussion 0
Questions 18

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

An LTM Specialist is investigating intermittent page load issues being reported by users.

What should the LTM Specialist do to resolve the issue?

Options:

A.  

Remove HTTP monitor on the pool.

B.  

Assign an HTTP monitor to the pool.

C.  

Select least connections load balancing method on virtual server.

D.  

Remove least connections load balancing method on virtual server.

Discussion 0
Questions 19

An LTM device is monitoring three pool members. One pool member is being marked down.

What should the LTM Specialist enable to prevent the server from being flooded with connections once its monitor determines it is up?

Options:

A.  

manual resume

B.  

packet shaping

C.  

hold down timer

D.  

slow ramp timer

E.  

fastest load balance algorithm

Discussion 0
Questions 20

The LTM Specialist is writing a custom HTTP monitor for a web application and has viewed the content by accessing the site directly via their browser. The monitor continually fails. The monitor configuration is:

ltm monitor http /Common/exampleComMonitor {

defaults-from /Common/http

destination *:*

interval 5

recv "Recent Searches"

send "GET /app/feed/current\?uid=20145 HTTP/1.1\\r\\nHost: www.example.com\\r\\nAccept-EncodinG. gzip, deflate\\r\\nConnection: close\\r\\n\\r\\n"

time-until-up 0

timeout 16

}

A trace shows the following request and response:

Request:

GET /app/feed/current?uid=20145 HTTP/1.1

Host www.example.com

Accept-Encoding gzip, deflate

Connection: close

Response:

HTTP/1.1 302 Moved Temporarily

Date Wed, 17 Oct 2012 18:45:52 GMT

Server Apache

Location https://example.com/login.jsp

Content-Encoding gzip

Content-Type text/html;charset=UTF-8

Set-CookiE. JSESSIONID=261EFFBDA8EC3036FBCC22D991AC6835; Path=/app/feed/current?uid=20145

What is the problem?

Options:

A.  

The request does NOT include a User-Agent header.

B.  

The HTTP monitor does NOT support monitoring jsp pages.

C.  

The request does NOT include any cookies and the application is expecting a session cookie.

D.  

The request includes an Accept-Encoding so the server is responding with a gzipped result and LTM monitors CANNOT handle gzipped responses.

Discussion 0
Questions 21

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

Which step should an LTM Specialist take next to finish upgrading to HD1.3?

Options:

A.  

Install image to HD1.3

B.  

Install hotfix to HD1.3

C.  

Activate HD1.3

D.  

Relicense HD1.3

Discussion 0
Questions 22

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

A web application is configured to allow sessions to continue even after a user computer is shut down for the night. A new LTM device is configured to load balance the web application to several servers. The application owner reports that application users are logged out of the web application whenever their browser is restarted or computer is rebooted.

What is the problem?

Options:

A.  

The virtual server does NOT have persistence configured.

B.  

The virtual server does NOT have persistence mirroring configured.

C.  

The cookie set by the LTM device does NOT have an "Expires" value.

D.  

The cookie set by the server is NOT being passed to client by the LTM device.

Discussion 0
Questions 23

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

An LTM Specialist is troubleshooting an issue with an application configured on an LTM device. The application works properly when accessed directly via the servers; however, it does not work when accessed via the LTM device. The virtual server, 192.168.1.211:443, is configured to SNAT using the address 192.168.1.144 and references a pool with the member 192.168.10.80:443. The virtual server has no Client or Server SSL profiles associated.

Which configuration change will allow the application to function through the virtual server?

Options:

A.  

Change pool member port to 8443.

B.  

Change virtual server port to 8443.

C.  

Add SSL off-loading to the pool member.

D.  

Add Client and Server SSL profiles to the virtual server.

Discussion 0
Questions 24

In preparation for a maintenance task, an LTM Specialist performs a "Force to Standby" on LTM device Unit 1. LTM device Unit 2 becomes active as expected. The maintenance task requires the reboot of Unit 1. Shortly after the reboot is complete, the LTM Specialist discovers that Unit 1 has become active and Unit 2 has returned to standby.

What would cause this behavior?

Options:

A.  

Unit 1 is set with the redundancy state preference of active in devices groups.

B.  

Unit 1 is set with the redundancy state preference of active in high availability.

C.  

A traffic group is configured with Auto Failback, and Unit 1 is the default device.

D.  

A device group is configured with Auto Failback, and Unit 1 is the default device.

Discussion 0
Questions 25

Which two alerting capabilities can be enabled from within an application visibility reporting (AVR) analytics profile? (Choose two.)

Options:

A.  

sFlow

B.  

SNMP

C.  

e-mail

D.  

LCD panel alert

E.  

high speed logging (HSL)

Discussion 0
Questions 26

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

An LTM Specialist uses the information in the logs to determine the cause of a failover event in a high-availability (HA) pair.

What caused the failover?

Options:

A.  

The overdog process crashed.

B.  

The system was administratively rebooted.

C.  

The process bcm56xxd received SIGTERM from the watchdog process.

D.  

The configuration reload request caused the config to reload and the device to failover.

Discussion 0
Questions 27

A failover event is recorded in the log messages:

Jan 01 00:00:50 BIG-IP notice sod[5855]: 01140029:5: HA proc_running tmm fails action is go offline and down links.

Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0050:5: Sod requests links down.

Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0054:5: Offline for traffic group /Common/traffic-group-1.

Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c003e:5: Offline

Jan 01 00:00:50 BIG-IP notice logger: /usr/bin/tmipsecd --tmmcount 4 ==> /usr/bin/bigstart stop racoon

Jan 01 00:00:50 BIG-IP info lacpd[5502]: 01160016:6: Failover event detected. (Switchboard failsafe disabled while offline)

Jan 01 00:00:51 BIG-IP err bcm56xxd[5296]: 012c0010:3: Failover event detected. Marking external interfaces down. bsx.c(3633)

Jan 01 00:00:51 BIG-IP info bcm56xxd[5296]: 012c0015:6: Link: 1.1 is DOWN

Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143c:5: Connection to CMI peer 10.0.0.3 has been removed

Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143a:5: CMI reconnect timer: enabled

Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 01071431:5: Attempting to connect to CMI peer 10.0.0.3 port 6699

What is the cause of the failover?

Options:

A.  

TMM failed, and VLAN fail-safe initiated the failover.

B.  

TMM failed, and system fail-safe initiated the failover.

C.  

Loss of connection to CMI peer 10.0.0.3 initiated the failover.

D.  

A switchboard failure caused system fail-safe to initiate the failover.

Discussion 0
Questions 28

A virtual server for a set of web services is constructed on an LTM device. The LTM Specialist has created an iRule and applied this iRule to the virtual server:

when HTTP_REQUEST {

switch [HTTP::uri] {

"/ws1/ws.jsp" {

log local0. "[HTTP::uri]-Redirected to JSP Pool"

pool JSP

}

default { log local0. "[HTTP::uri]-Redirected to Non-JSP Pool"

pool NonJSP

}

}

}

However, the iRule is NOT behaving as expected. Below is a snapshot of the log:

/WS1/ws.jsp-Redirected to JSP Pool

/WS1/ws.jsp-Redirected to JSP Pool

/WS1/ws.jsp-Redirected to JSP Pool

/WS1/WS.jsp-Redirected to Non-JSP Pool

/ws1/WS.jsp-Redirected to Non-JSP Pool

/WS1/ws.jsp-Redirected to JSP Pool

/ws1/ws.jsp-Redirected to Non-JSP Pool

What should the LTM Specialist do to resolve this?

Options:

A.  

Use the followinG.switch -lc [HTTP::uri]

B.  

Use the followinG.switch [string tolower [HTTP::uri]]

C.  

Set the "Case Sensitivity" option of each member to "None".

D.  

Select the "Process Case-Insensitivity" option for the virtual server.

Discussion 0
Questions 29

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

An LTM Specialist is reviewing the 'test' partition.

Which objects, in order, can be removed from the partition?

Options:

A.  

delete pool test1_pool, delete node 10.1.1.2

B.  

delete node 10.1.1.2, delete pool test2_pool

C.  

delete pool test1_pool, delete node 10.1.1.2, delete node 10.1.1.1

D.  

delete virtual test1_vs, delete pool test2_pool, delete node 10.1.1.1

E.  

delete pool test1_pool, delete pool test2_pool, delete node 10.1.1.3

Discussion 0
Questions 30

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

Based on the output of the tmsh interface show command, what is the issue?

Options:

A.  

There is a duplex mismatch on the management interface.

B.  

Interfaces 2.1 and 2.2 are defective and need replacement.

C.  

Flow Control is NOT configured on the management interface.

D.  

There are too many drops on inbound traffic on interface 1.1.

Discussion 0
Questions 31

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

An LTM Specialist is troubleshooting an application configured on an LTM device on a one-armed configuration. The application is NOT working through the LTM device but does work when accessed directly via the application servers. The virtual server 192.168.1.211:443 is configured to SNAT using the address 192.168.1.144 and references a pool with the member 192.168.10.80:443. No Client or Server SSL profiles are associated. The LTM Specialist has collected two traffic captures to help determine the issue.

What is the problem with the configuration on the LTM device?

Options:

A.  

Pool member is configured to use wrong port.

B.  

Pool member is configured for SSL off-loading.

C.  

Virtual server is configured to use wrong port.

D.  

Virtual server is configured without SSL Profiles.

Discussion 0