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301b LTM Specialist: Maintain & Troubleshoot Questions and Answers

Questions 4

-- 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.

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Questions 5

What is the recommended procedure for upgrading a major TMOS release on a BIG-IP platform?

Options:

A.

1. Renew the device license.

2.Take a configuration backup.

3.Reboot the device to the non-active volume.

4.Upload the device code.

5.Install device code to the current volume.

B.

1. Take a configuration backup.

2.Upload the device code.

3.Install device code to the non-active volume.

4.Reboot the device to the non-active volume.

5.Renew the device license.

C.

1. Renew the device license.

2.Take a configuration backup.

3.Upload the device code.

4.Install device code to the non-active volume.

5.Reboot the device to the non-active volume.

D.

1. Take a configuration backup.

2.Reboot the device to the non-active volume.

3.Renew the device license.

4.Upload the device code.

5. Install device code to the current volume.

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Questions 6

An LTM Specialist is troubleshooting a problem on an eCommerce website. The user browses the online store using port 80, adding items to the shopping cart. The user then clicks the "Checkout" button on the site, which redirects the user to port 443 for the checkout process. Suddenly, the user's shopping cart is shown as empty. The shopping cart data is stored in memory on the server, and the default source address persistence profile is used on both virtual servers.

What is the issue?

Options:

A.

The port 80 pool member is deleting the user's session cookie.

B.

The port 443 pool member is deleting the user's session cookie.

C.

The port 80 and port 443 connections are balanced to the same node.

D.

The port 80 and port 443 connections are balanced to different nodes.

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Questions 7

An LTM Specialist is receiving reports from customers about multiple applications failing to work properly. The LTM Specialist looks at the services running and notices that the bigd process has NOT started.

How are monitored LTM device objects marked when the bigd process is stopped?

Options:

A.

red or offline

B.

blue or unchecked

C.

green or available

D.

unchanged until bigd is restarted

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Questions 8

-- 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

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Questions 9

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]]" }

}

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Questions 10

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

Users are able to access the application when connecting to the virtual server but are unsuccessful when connecting directly to the application servers. The LTM Specialist wants to allow direct access to the application servers.

Which configuration change resolves this problem?

Options:

A.

Enable port 443 on the virtual server.

B.

Configure a SNAT pool on the LTM device.

C.

Disable address translation on the virtual server.

D.

Configure an IP Forwarding virtual server on the LTM device.

E.

Configure a route to the web server subnet on the network router.

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Questions 11

An LTM device is load balancing telnet and ssh applications in a client/server environment experiencing significant packet delay.

Which setting in the TCP profile should reduce the amount of packet delay?

Options:

A.

disable Bandwidth Delay

B.

disable Nagle's Algorithm

C.

enable Proxy Maximum Segment

D.

increase Maximum Segment Retransmissions

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Questions 12

While investigating the cause of a device failover, an LTM Specialist discovers the following events in /var/log/ltm:

01010029:5: Clock advanced by 518 ticks

01010029:5: Clock advanced by 505 ticks

01010029:5: Clock advanced by 590 ticks

01010029:5: Clock advanced by 568 ticks

01010029:5: Clock advanced by 1681 ticks

01010029:5: Clock advanced by 6584 ticks

01140029:5: HA daemon_heartbeat tmm fails action is failover and restart.

010c0026:5: Failover condition, active attempting to go standby.

Which issue caused the failover?

Options:

A.

NTP being out of sync

B.

TMM being descheduled

C.

VLAN Fail-safe heartbeats

D.

HA missing heartbeat packets

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Questions 13

An LTM device has been configured to log the reasons for generating TCP RST packets.

The following log entry occurs:

"01230140:3: RST sent from 192.168.1.100:80 to 192.168.1.124:39272, [0x112d82a:1721] {peer} TCP RST from remote system."

Which condition will trigger this log entry?

Options:

A.

A virtual server connection limit has been reached.

B.

The host at the other end terminated the TCP connection.

C.

The LTM device reset the connection because no pool members are available.

D.

The LTM device has reached the maximum number of allowed attempts to send the data segment to the affected TCP connection.

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Questions 14

An LTM device supports two power supplies. The value of the BigDB key "platform.powersupplymonitor" is equal to enable.

Where would the error message be visible if one of the power supplies fails or is NOT plugged in?

Options:

A.

visible only via the console

B.

in the /var/log/ltm log file

C.

in the /var/log/kern.log file

D.

in the /var/log/tmm log file

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Questions 15

A web application requires knowledge of the client's true IP address for logging and analysis purposes. Instances of the application that can decode X-Forwarded-For HTTP headers reside in pool_a, while pool_b instances assume the source IP is the true address of the client.

Which iRule provides the proper functionality?

Options:

A.

when HTTP_DATA {

if {[HTTP::header exists X-Forwarded-For]}{

pool pool_a

} else {

pool pool_b

}

}

B.

when HTTP_RESPONSE {

if {[HTTP::header exists X-Forwarded-For]}{

pool pool_a

} else {

pool pool_b

}

}

C.

when HTTP_REQUEST {

if {[HTTP::header exists X-Forwarded-For]}{

pool pool_a

} else {

pool pool_b

}

}

D.

when HTTP_OPEN {

if {[HTTP::header exists X-Forwarded-For]}{

pool pool_a

} else {

pool pool_b

}

}

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Questions 16

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

A pair of LTM devices are configured for HA. The LTM Specialist observes from a capture that there is a successful connection from a client directly to a web server and an unsuccessful connection from a client via the LTM device to the same web server.

Which two solutions will solve the configuration problem? (Choose two.)

Options:

A.

Configure SNAT on the pool.

B.

Configure SNAT on the virtual server.

C.

Change server default gateway to point at LTM internal self IP.

D.

Change server default gateway to point at LTM internal floating IP.

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Questions 17

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

A server administrator notices that one server is intermittently NOT being sent any HTTP requests. The server logs display no issues. The LTM Specialist notices log entries stating the node (172.16.20.1) status cycling between down and up. The pool associated with the virtual server (10.10.1.100) has a custom HTTP monitor applied.

Which tcpdump filter will help trace the monitor?

Options:

A.

tcpdump -i internal port 80 and host 172.16.1.31

B.

tcpdump -i external port 80 and host 10.10.1.100

C.

tcpdump -i internal port 80 and host 172.16.1.33

D.

tcpdump -i external port 80 and host 172.16.20.1

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Questions 18

An LTM Specialist has a OneConnect profile and HTTP profile configured on a virtual server to load balance an HTTP application.

The following HTTP headers are seen in a network trace when a client connects to the virtual server:

Clientside:

GET / HTTP/1.1

Host: 192.168.136.100

User-Agent: Mozilla/5.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-EncodinG. gzip, deflate

Connection: keep-alive

Serverside:

HTTP/1.1 200 OK

DatE. 5 Jun 1989 17:06:55 GMT

Server: Apache/2.2.14 (Ubuntu)

Vary: Accept-Encoding

Content-EncodinG. gzip

Content-LengtH. 3729

X-Cnection: close

Content-TypE. text/html

The LTM Specialist notices the OneConnect feature is working incorrectly.

Why is OneConnect functioning incorrectly?

Options:

A.

Client must support HTTP/1.0.

B.

Client must support HTTP keep-alive.

C.

Server must support HTTP/0.9.

D.

Server must support HTTP keep-alive.

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Questions 19

-- Exhibit –

-- Exhibit --

Refer to the exhibit.

An LTM Specialist configures a virtual server to load balance to a pool of FTP servers. File transfers are failing. The virtual server is configured as follows:

ltm virtual ftp_vs {

destination 10.10.1.103:ftp

ip-protocol tcp

mask 255.255.255.255

pool ftp_pool

profiles {

tcp { }

}

vlans-disabled

}

Which change will resolve the problem?

Options:

A.

Add an FTP monitor to the pool.

B.

Add an FTP profile to the virtual server.

C.

Enable loose initiation in the TCP profile.

D.

Increase the TCP timeout value in the TCP profile.

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Questions 20

A web application is meant to log the URI of the resource that responded to the client's initial Request-URI.

Which HTTP header will supply this information?

Options:

A.

Via

B.

Server

C.

Trailer

D.

Referer

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Questions 21

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)

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Questions 22

An LTM Specialist is troubleshooting an HTTP monitor. The pool member is accessible directly through a browser, but the HTTP monitor is marking the pool member as down.

GET / HTTP/1.1

HTTP/1.1 400 Bad Request

DatE. Tue, 23 Oct 2012 21:39:07 GTM

Server: Apache/2.2.22 (FreeBSD) PHP/5.4.4

mod_ssl/2.2.22 OpenSSL/0.9.8q DAV/2

Content-LengtH. 226

Connection: close

Content-TypE. text/html; charset=iso-8859-1

Which issue is the pool member having?

Options:

A.

The pool member has too many concurrent connections.

B.

The pool member is rejecting the request because it is invalid.

C.

The pool member lacks the object requested by the monitor.

D.

The pool member is NOT accepting requests from the LTM device IP address.

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Questions 23

An LTM Specialist configures an HTTP monitor as follows:

ltm monitor http stats_http_monitor {

defaults-from http

destination *:*

interval 5

recv "Health check: OK"

send "GET /stats/stats.html 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

}

The monitor is marking all nodes as down. A trace of the HTTP conversation shows the following:

GET /stats/stats.html HTTP/1.1

Host: www.example.com

Accept-EncodinG. gzip, deflate

Connection: close

HTTP/1.1 401 Authorization Required

DatE. Tue, 23 Oct 2012 19:38:56 GMT

Server: Apache/2.2.15 (Unix)

WWW-AuthenticatE. Basic realm="Please enter your credentials"

Content-LengtH. 480

Connection: close

Content-TypE. text/html; charset=iso-8859-1

Which action will resolve the problem?

Options:

A.

Add an NTLM profile to the virtual server.

B.

Add a valid username and password to the monitor.

C.

Use an HTTPS monitor with a valid certificate instead.

D.

Add a backslash before the colon in the receive string.

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Questions 24

An LTM Specialist must perform a hot fix installation from the command line.

What is the correct procedure to ensure that the installation is successful?

Options:

A.

import the hot fix to the /var/shared/images directory

check the integrity of the file with an md5 checksum

tmsh apply sys software hotfix volume .iso

B.

import the hot fix to the /var/shared/images directory

check the integrity of the file with an md5 checksum

tmsh install sys software hotfix .iso volume

C.

import the hot fix to the /shared/images directory

check the integrity of the file with an md5 checksum

tmsh apply sys software hotfix volume .iso

D.

import the hot fix to the /shared/images directory

check the integrity of the file with an md5 checksum

tmsh install sys software hotfix .iso volume

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Questions 25

Which command will identify the active LTM device currently handling client traffic?

Options:

A.

b ha table show

B.

tmsh list /sys ha-status

C.

tmsh show /cm traffic-group

D.

tmsh run /sys failover standby

E.

tmsh show /sys ha-status all-properties

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Questions 26

-- 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.

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Questions 27

When re-licensing an LTM device from the command line interface, which tmsh command should the LTM Specialist use to generate the required information to provide on the F5 licensing portal?

Options:

A.

tmsh run /util get-dossier

B.

tmsh generate /sys dossier

C.

tmsh list /sys registration-key

D.

tmsh install /sys license registration-key

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Questions 28

-- 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.

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Questions 29

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

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Questions 30

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.

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Questions 31

An LTM Specialist needs to modify the logging level for tcpdump execution events. Checking the BigDB Key, the following is currently configured:

sys db log.tcpdump.level {

value "Notice"

}

Which command should the LTM Specialist execute on the LTM device to change the logging level to informational?

Options:

A.

tmsh set /sys db log.tcpdump.level value informational

B.

tmsh set /sys db log.tcpdump.level status informational

C.

tmsh modify /sys db log.tcpdump.level value informational

D.

tmsh modify /sys db log.tcpdump.level status informational

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Exam Code: 301b
Exam Name: LTM Specialist: Maintain & Troubleshoot
Last Update: May 4, 2024
Questions: 209
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