Updated Sep-2022 Official licence for 301b Certified by 301b Dumps PDF [Q112-Q134]

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Updated Sep-2022 Official licence for 301b Certified by 301b Dumps PDF

Grab latest Amazon 301b Dumps as PDF Updated on 2022

Exam Domains Overview

301B exam is based on three domains and tries to testify candidate’s knowledge on various topics, including the following:

Troubleshoot basic performance issues
The last section assesses if the test-taker is aware of LTM device logs issues, can find what can cause them, and what are the ways to construct a viable solution. Other skills needed include the ability to find out why LTM device failover problems arise as well as high availability and/or sync failure. Finally, applicants should know how to interpret log file messages, and more.
Maintain Application and LTM Device Health
This first section intends to check how the candidate determines the appropriate profile setting modifications in a given scenario along with sub-set of an LTM configuration, LTM device statistics, finding out the appropriate upgrade and recovery steps, ways to minimize application outages, benefits of custom alerting, and setting up custom alerts.

AVR alerting capabilities, vCMP environment upgrading, SCF and UCS files, performance statistics, and buffer settings in the TCP profile are some of the skills included in this exam domain.
Troubleshoot basic hardware issues
As the title suggests, the second module is dedicated to the key issues and some of the most common ways to deal with them. This part of the outline is quite extensive and consists of 15 sub-domains. By going through all of them, the applicants will learn more about what all it takes to determine which iRule to use to resolve an application issue, the iRule functionality, how to correctly interpret the AVR information for defining performance issues as well as the LTM device misconfiguration, and how to choose the appropriate HTTP/HTTPS application headers.

Finding out the HTTP/HTTPS application errors & their solutions, comparing the traces to determine the root cause of an HTTP/HTTPS application problem and the best way to resolve it, finding out the right protocol analyzer tool, and identifying from where to gather the protocol analyzer data are also covered well in this exam domain along with the topic such as how to define monitor issues and solutions for them.

QUESTION 112
— Exhibit –

— Exhibit —
Refer to the exhibit.
An LTM Specialist has uploaded a qkview to F5 iHealth.
Within the GUI, what is the correct procedure to comply with the recommendation shown in the exhibit?

Obtain product version image from release.f5.com.
Overwrite existing image with new product version image.
Select product version image and click Install.
Select the available disk and volume set name.

Obtain product version image from images.f5.com.
Overwrite existing image with new product version image.
Select product version image and click Install.
Select the available disk and volume set name.

Obtain product version image from downloads.f5.com.
Import product version image.
Install image onto BIG-IP platform.
Select product version image and click Install.
Select the available disk and volume set name.

Log a call requesting the product version image via websupport.f5.com Import product version image.
Install image onto BIG-IP platform.
Select product version image and click Install.
Select the available disk and volume set name.

QUESTION 113
An LTM Specialist is setting up a monitor for an HTTP 1.1 server. The response to a GET / is:
HTTP/1.1 302 Moved Temporarily
Location: http://www.example.com/new/location.html
Which send string settings should the LTM Specialist use to force a proper response?

GET / HTTP/1.0rnHost: host.domain.comrnConnection: Closernrn

GET /new/location.html HTTP/1.1rnHost: www.example.comrnConnection: Closernrn

GET / HTTP/1.1rnHost: www.example.com/new/location.htmlrnConnection: Closernrn

GET /new/location.html HTTP/1.1rnHost: host.domain.com/new/locations.htmlrnConnection: Closer
nrn

QUESTION 114
A client (10.10.1.30) connecting to an HTTPS virtual server (10.10.1.100) with a clientssl profile is getting an SSL error.
Which options will trace this issue?

tcpdump -i external -X -e -nn -vvv -w /shared/ssl_problem.cap port 443 and host 10.10.1.30 ssldump -r /shared/ssl_problem.cap -n -x

tcpdump -i external -s 0 -w /shared/ssl_problem.cap port 443 and host 10.10.10.30 and host
10.10.1.100
ssldump -r /shared/ssl_problem.cap -n -x

tcpdump -i external -X -s 0 -vvv src host 10.10.10.30 and dst host 10.10.1.100 and port 443 > /shared/ ssl_problem.cap
ssldump -r /shared/ssl_problem.cap -n -x

tcpdump -i external -X -e -nn -vv port 443 and host 10.10.1.100 and host 10.10.1.30 > /shared/ ssl_problem.cap
ssldump -n -x < /shared/ssl_problem.cap

QUESTION 115
The following decoded TCPDump capture shows the trace of a failing health monitor.
00:00:13.245104 IP 10.29.29.60.51947 > 10.0.0.12.http: P 1:59(58) ack 1 win 46
<nop,nop,timestamp 2494782300 238063789> out slot1/tmm3 lis=
0x0000: 4500 006e 3b19 4000 4006 ce0c 0a1d 1d3c E..n;.@.@……<
0x0010: 0a00 000c caeb 0050 8be5 aca3 dd65 e3e1 …….P…..e..
0x0020: 8018 002e 1b41 0000 0101 080a 94b3 5b5c …..A……..[
0x0030: 0e30 90ad 4745 5420 2f74 6573 745f 7061 .0..GET./test_pa
0x0040: 6765 2e68 746d 6c20 4854 5450 312e 310d ge.html.HTTP1.1.
0x0050: 0a48 6f73 743a 200d 0a43 6f6e 6e65 6374 .Host:…Connect
0x0060: 696f 6e3a 2043 6c6f 7365 0d0a 0d0a 0105 ion:.Close……
0x0070: 0100 0003 00 …..
00:00:13.245284 IP 10.0.0.12.http > 10.29.29.60.51947: . ack 59 win 362
<nop,nop,timestamp 238063789 2494782300> in slot1/tmm3 lis=
0x0000 0ffd 0800 4500 00c9 6f68 4000 8006 755d ….E…oh@…u]
0x0010 0a29 0015 0a29 0103 0050 e0d6 4929 90eb .)…)…P..I)..
0x0020 6f12 d83c 8019 fab3 9b31 0000 0101 080a o..<…..1……
0x0030 0068 4e10 5240 6150 4854 5450 2f31 2e31 .hN.R@aPHTTP/1.1
0x0040 2034 3030 2042 6164 2052 6571 7565 7374 .400.Bad.Request
0x0050 0d0a 436f 6e74 656e 742d 5479 7065 3a20 ..Content-Type:.
0x0060 7465 7874 2f68 746d 6c0d 0a44 6174 653a text/html..Date:
0x0070 2054 6875 2c20 3231 204a 616e 2032 3031 .Mon,.01.Jan.201
0x0080 3020 3138 3a35 383a 3537 2047 4d54 0d0a 2.00:00:01.GMT..
0x0090 436f 6e6e 6563 7469 6f6e 3a20 636c 6f73 Connection:.clos
0x00a0 650d 0a43 6f6e 7465 6e74 2d4c 656e 6774 e..Content-Lengt
0x00b0 683a 2032 300d 0a0d 0a3c 6831 3e42 6164 h:.20….<h1>Bad
0x00c0 2052 6571 7565 7374 3c2f 6831 3e .Request</h1>
The health monitor is sending the string shown in the capture; however, the server response is NOT as expected. The correct response should be an HTML page including the string ‘SERVER IS UP’.
What is the issue?

The /test_page.html does NOT exist on the web server.

Incorrect syntax in send string. ‘HTTP1.1’ should be ‘HTTP/1.1’.

Incorrect syntax in send string. ‘Connection: Close’ should be ‘Connection: Open’.

The wrong HTTP version is specified in the send string. Version 1.2 should be used instead of version 1.1.

QUESTION 116
An LTM device has a virtual server configured as a Performance Layer 4 virtual listening on 0.0.0.0:0 to perform routing of packets to an upstream router. The client machine at IP address 192.168.0.4 is attempting to contact a host upstream of the LTM device on IP address 10.0.0.99.
The network flow is asymmetrical, and the following TCP capture displays:
# tcpdump -nnni 0.0 ‘host 192.168.0.4 and host 10.0.0.99’
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on 0.0, link-type EN10MB (Ethernet), capture size 96 bytes
05:07:55.499954 IP 192.168.0.4.35345 > 10.0.0.99.443: S 3205656213:3205656213(0) ack 3267995082 win 1480
05:07:55.499983 IP 10.0.0.99.443 > 192.168.0.4.35345: R 1:1(0) ack 1 win 0
05:07:56.499960 IP 192.168.0.4.35345 > 10.0.0.99.443: S 3205656213:3205656213(0) ack 3267995082 win 1480
05:07:56.499990 IP 10.0.0.99.443 > 192.168.0.4.35345: R 1:1(0) ack 1 win 0
4 packets captured
Which option within the fastL4 profile needs to be enabled by the LTM Specialist to prevent the LTM device from rejecting the flow?

Loose Close

Loose Initiation

Reset on Timeout

Generate Initial Sequence Number

QUESTION 117
— Exhibit –

— Exhibit —
Refer to the exhibit.
Which two items can be consolidated to simplify the LTM configuration? (Choose two.)

/Common/vs1-https-redirect

/Common/vs2-https-redirect

/Common/vs3-https-redirect

/Common/vs4-https-redirect

/Common/vs5-https-redirect

QUESTION 118
An active/standby pair of LTM devices deployed with network failover are working as desired. After external personnel perform maintenance on the network, the LTM devices are active/active rather than active/standby. No changes were made on the LTM devices during the network maintenance.
Which two actions would help determine the cause of the malfunction? (Choose two.)

checking that the configurations are synchronized

checking the configuration of the VLAN used for failover

checking the configuration of the VLAN used for mirroring

checking the open ports in firewalls between the LTM devices

checking synchronization of system clocks among the network devices

QUESTION 119
— Exhibit –

— Exhibit —
Refer to the exhibits.
How should the LTM Specialist minimize the configuration?

Remove the pool member level monitors.

The configuration is as minimized as possible.

Create a single monitor and apply it to each pool member.

Create a single monitor, apply it to the pool, and remove the pool member level monitors.

QUESTION 120
There is a fault with an LTM device load balanced trading application that resides on directly connected VLAN vlan-301. The application virtual server is 10.0.0.1:80 with trading application backend servers on subnet
192.168.0.0/25. The LTM Specialist wants to save a packet capture with complete payload for external analysis.
Which command should the LTM Specialist execute on the LTM device command line interface?

tcpdump -vvv -w /var/tmp/trace.cap ‘net 192.168.0.0/25’

tcpdump -vvv -s 0 -w /var/tmp/trace.cap ‘net 192.168.0.0/25’

tcpdump -vvv -nni vlan-301 -w /var/tmp/trace.cap ‘net 192.168.0.0/25’

tcpdump -vvv -s 0 -nni vlan-301 -w /var/tmp/trace.cap ‘net 192.168.0.0/25’

QUESTION 121
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?

visible only via the console

in the /var/log/ltm log file

in the /var/log/kern.log file

in the /var/log/tmm log file

QUESTION 122
— Exhibit –

— Exhibit —
Refer to the exhibits.
An LTM Specialist is troubleshooting an issue with one of the virtual servers on an LTM device, and all requests are receiving errors. Testing directly against the server generates no errors. The LTM Specialist has captured the request and response on both client and server sides of the LTM device.
What should the LTM Specialist do to fix this issue?

Remove “header-erase Host” in http profile.

Configure SNAT Automap on the virtual server.

Assign OneConnect profile to the virtual server.

Set “redirect-rewrite” to “selective” in http profile.

QUESTION 123
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?

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

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

Loss of connection to CMI peer 10.0.0.3 initiated the failover.

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

QUESTION 124
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 server traffic specifically for this application?

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

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

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

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

QUESTION 125
An LTM device is serving an FTP virtual server that has three pool members. The FTP pool members are monitored via TCP port 21. Customers are reporting that they are able to log in, but are sometimes unable to upload files to the server.
Which monitor should the LTM Specialist configure to verify that the servers can handle file uploads?

FTP

Inband

External

Scripted

Real Server

QUESTION 126
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?

NTP being out of sync

TMM being descheduled

VLAN Fail-safe heartbeats

HA missing heartbeat packets

QUESTION 127
— Exhibit –

— Exhibit —
Refer to the exhibits.
Users are able to access the application when connecting directly to the web server but are unsuccessful when connecting to the virtual server.
What is the cause of the application access problem?

The virtual server has SNAT disabled.

The client has no route to the web server.

The virtual server has address translation disabled.

The web server is NOT responding on the correct port.

The virtual server is NOT configured to listen on port 80.

QUESTION 128
— Exhibit- — Exhibit –

Refer to the exhibit.
An LTM Specialist is troubleshooting a new HTTP monitor on a pool. The pool member is functioning correctly when accessed directly through a browser. However, the monitor is marking the member as down. The LTM Specialist captures the monitor traffic via tcpdump.
What is the issue?

The server is marking the connection as closed.

The pool member is rejecting the monitor request.

The monitor request is NOT returning the page body.

The ‘time-until-up’ setting on the monitor is incorrect.

QUESTION 129
The LTM Specialist is in the process of creating a USB boot drive for the purpose of restoring the BIG-IP software to an LTM device. A separate LTM device has been selected for the purpose of creating the USB boot drive. The BIG-IP software ISO has already been uploaded and mounted on the separate LTM device.
Which command should the LTM Specialist use to trigger the LTM device to install the BIG-IP software to the USB boot drive?

tmsh

install

mkdisk

bigip_software_create

QUESTION 130
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?

Add an NTLM profile to the virtual server.

Add a valid username and password to the monitor.

Use an HTTPS monitor with a valid certificate instead.

Add a backslash before the colon in the receive string.

QUESTION 131
— Exhibit – — Exhibit –

Refer to the exhibits.
A virtual server has been configured for SSL offload on a single-arm network. On average, the virtual server will be handling 100,000 connections, with a peak of 130,000 connections. Between the virtual server and the web servers there is a single reverse proxy to provide site caching. The proxy is configured to perform source IP persistence before contacting the web servers. The site is logging users out immediately after logging them in.
What should the LTM Specialist do to resolve this issue?

Add a source address persistence profile to the virtual server.

Create an iRule to add client IP persistence to a SNAT pool member.

Change the virtual server server-side TCP profile to tcp-lan-optimized.

Configure the virtual server HTTP profile to insert an X-Forwarded-For header.

QUESTION 132
An LTM device is running BIG-IP v10.2.0 software. The LTM Specialist is tasked with upgrading the LTM device to BIG-IP v11.2.0 HF1. The LTM Specialist starts the upgrade process by selecting the uploaded Hotfix and installing to an unused volume. After 10 minutes,the LTM Specialist checks the status of the upgrade process and notices that the process is stalled at 0%.
What should the LTM Specialist verify?

the selected volume has sufficient space available

the base software version exists on the LTM device

the LTM device has been restarted into maintenance mode

the LTM device has an available Internet connection via the management interface

QUESTION 133
— Exhibit –

— Exhibit —
Refer to the exhibit.
An LTM Specialist configures a virtual server that balances HTTP connections to a pool of three application servers. Approximately one out of every three connections to the virtual server fails.
Which two actions will resolve the problem? (Choose two.)

Assign a custom HTTP monitor to the pool.

Enable SNAT automap on the virtual server.

Verify that port lockdown is set to allow port 80.

Verify the default gateway on the application servers.

Increase the TCP timeout value in the default TCP profile.

QUESTION 134
An LTM device pair is configured for failover and connection mirroring. The LTM devices are configured with virtual servers for HTTP, HTTPS with SSL offload, and SSH. An event occurs that causes a failover.
HTTP and SSH sessions active at the time of failover remain active, but HTTPS sessions are dropped.
What is the root cause of this problem?

The SSL certificates on the LTM devices do NOT match.

Connection mirroring is incompatible with clientssl profiles.

SNAT automap was NOT enabled for the HTTPS virtual servers.

Connection mirroring was NOT enabled for the HTTPS virtual servers.

F5 301b Exam Syllabus Topics:

Topic	Details
Topic 1	Determine the appropriate upgrade and recovery steps required to restore functionality to LTM devices Troubleshoot Basic Virtual Server Connectivity Issues
Topic 2	Describe how to set up custom alerting for an LTM device Determine the root cause of an application problem
Topic 3	Identify the appropriate command to use to determine the cause of an LTM device problem determine which objects to remove or consolidate to simplify the LTM configuration
Topic 4	Determine the appropriate upgrade steps required to minimize application Determine from where the protocol analyzer data should be collected
Topic 5	Interpret log file messages and or command line output to identify LTM device issues1 Interpret AVR information to identify LTM device misconfiguration
Topic 6	Describe the benefits of custom alerting within an LTM environment Interpret AVR information to identify performance issues or application attacks
Topic 7	Determine the appropriate profile setting modifications Determine a solution to an application problem