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F5 303 exam consists of 80 multiple-choice questions and is delivered in a computer-based testing format. The test is designed to evaluate the candidate’s knowledge of ASM features, capabilities, and functionalities, including configuring and managing ASM policies, signatures, profiles and positive security models, and also includes topics like ASM attack signatures, protocol decoding, and learning modes.

Q312. — Exhibit –

— Exhibit —
Refer to the exhibit.
Users receive an error when attempting to connect to the website https://website.com. The website has a DNS record of 195.56.67.90. The upstream ISP has confirmed that there is nothing wrong with the routing between the user and the LTM device.
The following tcpdump outputs have been captured:
External Vlan, filtered on IP 168.210.232.5
00:25:07.598519 IP 168.210.232.5.33159 > 195.56.67.90.https: S 1920647964:1920647964(0) win 8192 <mss
1450,nop,nop,sackOK>
00:25:07.598537 IP 195.56.67.90.https > 168.210.232.5.33159: S 2690691360:2690691360(0) ack
1920647965 win 4350 <mss 1460,sackOK,eol>
00:25:07.598851 IP 168.210.232.5.33160 > 195.56.67.90.https: S 2763858764:2763858764(0) win 8192 <mss
1450,nop,nop,sackOK>
00:25:07.598858 IP 195.56.67.90.https > 168.210.232.5.33160: S 1905576176:1905576176(0) ack
2763858765 win 4350 <mss 1460,sackOK,eol>
Internal Vlan, filtered on IP 168.210.232.5
00:31:46.171124 IP 168.210.232.5.33202 > 192.168.100.20.http: S 2389057240:2389057240(0) win 4380
<mss 1460,nop,wscale 0,sackOK,eol>
What is the problem?

The filters on the tcpdumps are incorrect.

The DNS entry for website.com is incorrect.

The virtual server ‘WEBSERVICES1’ is listening on the incorrect port.

The firewall is dropping the connection coming from the pool members returned to the client.

The subnet masks of the pool members of pool WebServices1 and the f5 ‘Internal’ Vlan are incorrect.

Q313. A BIG-IP Administrator upgrades the BIG-IP LTM to a newer software version. After the administrator reboots into the new volume, the Configuration fails to load. Why is the Configuration failing to load?

The license needs to be reactivated before the upgrade.

The upgrade was performed on the standby unit.

A minimum of at least two reboots is required.

Connectivity to the DNS server failed to be established.

Q314. — Exhibit –

— Exhibit —
Refer to the exhibit.
Based on the output of the tmsh interface show command, what is the issue?

There is a duplex mismatch on the management interface.

Interfaces 2.1 and 2.2 are defective and need replacement.

Flow Control is NOT configured on the management interface.

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

Q315. Refer to the exhibit. A client attempts to connect from a Google Chrome browser to a virtual server on a BIG-IP LTM. The virtual server is SSL Offloaded. When the client connects, the client receives an SSL error. The client receives the same errors when trying Mozilla Firefox and Internet Explorer browsers.
The LTM Specialist does an ssldump on the virtual server and receives the results as per the exhibit.
How should this be resolved?

Set the virtual server to listen on port 443 (HTTPS).

Upgrade the client to support the appropriate SSL cipher suite.

Select the appropriate “SSL Profile (Client)” in the virtual server settings.

Adjust the SSL key length in the SSL profile to match the minimum required by the client.

Q316. Refer to the exhibit. The http monitor is applied to a pool All members are enabled One pool member stops responding TCP port 80. The server still responds to ping. What is the resulting status of this pool member?

Available (Enabled)

Offline (Disabled)

Unavailable (Disabled)

Unknown (Enabled)

Q317. An LTM specialist needs to upgrade a VCMP quest in an HA Setup with minimum interruption for all VCMP guest instances. In which should the LTM Specialist perform this upgrade?

Relicense the host. Failover all guest’s active traffic-groups to the other host, copy image to gest, create guest UCS install and set boot location to new volume, reboot

Failover this specific guest’s active traffic-group to the other Host, Relicense the guest, copy image to guest , create guest UCS, install and set boot location to new volume, reboot

Failover all guests’ active traffic-group to the other Host, Relicense the host, copy image to guest, create guest UCS, install and set boot location to new volume , reboot

Failover all guests’ active traffic-group to the other host, copy image to guest, create guest UCS install and set boot location to new volume, reboot, Relicense the host

Q318. Users are experiencing low throughput when downloading large files over a high-speed WAN connection. Extensive packet loss was found to be an issue but CANNOT be eliminated. Which two TCP profile settings should be modified to compensate for the packet loss in the network?
(Choose two.)

slow start

proxy options

proxy buffer low

proxy buffer high

Nagle’s algorithm

Q319. A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?

/var/log/messages

/var/log/audit

/var/log/user.log

/var/log/secure

Q320. The LTM device is configured to provide load balancing to a set of web servers that implement access control lists (ACL) based on the source IP address of the client. The ACL is at the network level and the web server is configured to send a TCP reset back to the client if it is NOT permitted to connect.
The virtual server is configured with the default OneConnect profile.
The ACL is defined on the web server as:
Permit: 192.168.136.0/24
Deny: 192.168.116.0/24
The packet capture is taken of two individual client flows to a virtual server with IP address 192.168.136.100.
Client A – Src IP 192.168.136.1 – Virtual Server 192.168.136.100:
Clientside:
09:35:11.073623 IP 192.168.136.1.55684 > 192.168.136.100.80: S 869998901:869998901(0) win 8192 <mss
1460,nop,wscale 2,nop,nop,sackOK>
09:35:11.073931 IP 192.168.136.100.80 > 192.168.136.1.55684: S 2273668949:2273668949(0) ack
869998902 win 4380 <mss 1460,nop,wscale 0,sackOK,eol>
09:35:11.074928 IP 192.168.136.1.55684 > 192.168.136.100.80: . ack 1 win 16425
09:35:11.080936 IP 192.168.136.1.55684 > 192.168.136.100.80: P 1:299(298) ack 1 win 16425
09:35:11.081029 IP 192.168.136.100.80 > 192.168.136.1.55684: . ack 299 win 4678 Serverside:
09:35:11.081022 IP 192.168.136.1.55684 > 192.168.116.128.80: S 685865802:685865802(0) win 4380 <mss
1460,nop,wscale 0,sackOK,eol>
09:35:11.081928 IP 192.168.116.128.80 > 192.168.136.1.55684: S 4193259095:4193259095(0) ack
685865803 win 5840 <mss 1460,nop,nop,sackOK,nop,wscale 6>
09:35:11.081943 IP 192.168.136.1.55684 > 192.168.116.128.80: . ack 1 win 4380
09:35:11.081955 IP 192.168.136.1.55684 > 192.168.116.128.80: P 1:299(298) ack 1 win 4380
09:35:11.083765 IP 192.168.116.128.80 > 192.168.136.1.55684: . ack 299 win 108 Client B – Src IP 192.168.116.1 – Virtual Server 192.168.136.100:
Clientside:
09:36:11.244040 IP 192.168.116.1.55769 > 192.168.136.100.80: S 3320618938:3320618938(0) win 8192
<mss 1460,nop,wscale 2,nop,nop,sackOK>
09:36:11.244152 IP 192.168.136.100.80 > 192.168.116.1.55769: S 3878120666:3878120666(0) ack
3320618939 win 4380 <mss 1460,nop,wscale 0,sackOK,eol>
09:36:11.244839 IP 192.168.116.1.55769 > 192.168.136.100.80: . ack 1 win 16425
09:36:11.245830 IP 192.168.116.1.55769 > 192.168.136.100.80: P 1:299(298) ack 1 win 16425
09:36:11.245922 IP 192.168.136.100.80 > 192.168.116.1.55769: . ack 299 win 4678 Serverside:
09:36:11.245940 IP 192.168.136.1.55684 > 192.168.116.128.80: P 599:897(298) ack 4525 win 8904
09:36:11.247847 IP 192.168.116.128.80 > 192.168.136.1.55684: P 4525:5001(476) ack 897 win 142 Why was the second client flow permitted by the web server?

A global SNAT is defined.

SNAT automap was enabled on the virtual server.

The idle TCP session from the first client was re-used.

A source address persistence profile is assigned to the virtual server.

Q321. 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?

disable Bandwidth Delay

disable Nagle’s Algorithm

enable Proxy Maximum Segment

increase Maximum Segment Retransmissions

Q322. Interface 1.2 on a BIG-IP VE has a status of UNINITIALIZED. What is the reason for this status?

Interface 1.2 has been added to a trunk.

Interface 1.2 has NOT been assigned to a VLAN.

Interface 1.2 has been disabled.

No default route has been created.

Q323. An LTM device is monitoring pool members on port 80. The LTM device is using an HTTP monitor with a send string of GET / and a blank receive string. What would cause the pool members to be marked down?

A pool member responds with an HTTP 200 series response code.

A pool member responds with an HTTP 300 series response code.

A pool member responds with an HTTP 400 series response code.

A pool member responds with an HTTP 500 series response code.

A pool member does NOT acknowledge the connection SYN on port 80.

Q324. A BIG-IP Administrator defines a device Self IP. The Self IP is NOT reachable from the network.
What should the BIG-IP Administrator verify first?

The correct interface has been selected.

The correct VLAN has been selected.

Verify if auto last hop is disabled.

The correct Trunk has been selected.

Q325. 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?

The pool member is disabled

Monitor Type is TCP Half Open

Manual resume is enabled

Time Until Up is zero

Q326. 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?

Via

Server

Trailer

Referer

Q327. — Exhibit –

— Exhibit —
Refer to the exhibit.
A pair of LTM devices is configured for HA.
What happens if the pool member server with IP address 10.0.0.4 becomes totally unresponsive to the active LTM device, but is still responsive to the standby LTM device?

The HA-group will disable the trunk my_trunk.

The HTTP application will be unavailable via the LTM device.

The HA-group will initiate a fail-over because the threshold is set to 2.

The HA-group will initiate a fail-over because the HA-Group score will be zero.

Q328. A virtual server is configured to offload SSL from a pool of backend servers. When users connect to the virtual server, they successfully establish an SSL connection but no content is displayed. A packet trace performed on the server shows that the server receives and responds to the request. What should a BIG-IP Administrator do to resolve the problem?

enable Server SSL profile

disable Server SSL profile

disable SNAT

enable SNAT

Q329. In BIG-IP ASM, what does the “Attack Signature” feature help detect?

Application layer attacks, such as SQL injection and XSS

Low-level network vulnerabilities, such as TCP SYN floods

SSL/TLS encryption weaknesses

Server misconfigurations and improper load balancing

Q330. A company plans to launch a huge marketing campaign and expects increase demand of their secure website. With the current virtual server setup, the LTM Specialist expects that the LTM device will reach its capacity limits. For the wen application to function properly. Cookies persistence is required. The LTM Specialist needs to reduce LTM device load without breaking the application. Which two settings should the LTM Specialist modify to meet the requirement?
(Choose two.)

Remove HTTP compression profile

Remove HTTP profile

Remove web acceleration profile.

Modify virtual Server type to performance (Layer 4)

Remove ClientSSL profile

Achieving the F5 303 certification demonstrates a high level of proficiency in BIG-IP ASM technology and validates the ability to secure web applications against various attacks. BIG-IP ASM Specialist certification is highly valued in the industry and can lead to career advancement opportunities and higher salaries. It also allows professionals to stay up-to-date with the latest security trends and technologies, ensuring that they are equipped to protect their organizations against evolving threats.

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