100+ Free A10 ACOS Practice Questions

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Which operating system runs on A10 Networks Thunder appliances and underlies the A10 Certified Professional exam?

ACOS (Advanced Core Operating System)

Cisco IOS-XE

Junos OS

F5 TMOS

to track

2026 Statistics

Key Facts: A10 ACOS Exam

90 min

Exam Duration

A10 Networks certification handbook

70%

Passing Score

A10 Certified Professional program

$200

Exam Fee (USD)

Kryterion exam pricing

3 years

Credential Validity

A10 Networks Certified Professional program

Kryterion

Test Provider

A10 Networks training site

ACOS

Operating System

A10 Thunder series platform

A10 Networks Certified Professional - System Administration (ACOS) is a proctored, multiple-choice exam delivered by Kryterion. The 90-minute exam validates ACOS administration on A10 Thunder devices, covering centralized configuration with aVCS, VRRP-A high availability, Application Delivery Partitions (ADP) and Layer 3 Virtualization (L3V), role-based admin, SNMP and logging, aXAPI usage, and troubleshooting. Passing earns the A10 Certified Professional designation, valid for three years. Candidates complete the exam in one attempt, with a passing score of 70%, and registration is handled directly through Kryterion.

Sample A10 ACOS Practice Questions

Try these sample questions to test your A10 ACOS exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which operating system runs on A10 Networks Thunder appliances and underlies the A10 Certified Professional exam?

A.ACOS (Advanced Core Operating System)

B.Cisco IOS-XE

C.Junos OS

D.F5 TMOS

Explanation: A10 Thunder devices run ACOS, the Advanced Core Operating System. ACOS is A10's proprietary OS built on a 64-bit, multi-core architecture with separate control and data planes. IOS-XE, Junos, and TMOS are operating systems for Cisco, Juniper, and F5 platforms respectively.

2From the ACOS CLI, which prompt indicates that you are in the global configuration mode where you can edit running config?

A.ACOS(config)#

B.ACOS>

C.ACOS#

D.ACOS(diag)#

Explanation: ACOS uses an industry-standard CLI hierarchy. The unprivileged prompt ends in '>'; Privileged EXEC ends in '#'; global configuration mode ends in '(config)#'. Sub-modes such as interface or template editing extend that prompt further (for example, '(config-if:eth1)#').

3Which command saves the running configuration to startup so it persists across a reboot on an ACOS device?

A.write memory

B.copy run start verbose

C.save config persist

D.commit config

Explanation: ACOS uses 'write memory' (often abbreviated 'wr mem') to copy the running configuration into the startup configuration. 'commit' is Junos style, 'copy run start' is Cisco IOS, and 'save config persist' is not a valid ACOS command.

4Which ACOS command displays a summary of all configured Layer 4 and Layer 7 virtual servers and their current status?

A.show slb virtual-server

B.show server load-balance

C.show vserver detail

D.show config slb

Explanation: 'show slb virtual-server' lists virtual servers with their VIP, ports, attached service groups, and operational state. 'show config slb' would dump configuration text, and the other two options are not valid ACOS commands.

5On an ACOS device, what is the recommended initial method to assign a management IP and reach the GUI on a brand-new appliance?

A.Console connection, configure management interface IP, then browse to the GUI

B.Connect any data port, plug a laptop in, and DHCP will hand out a routable address

C.Boot in factory-recovery mode and use the ZTP cloud console

D.Use the service LCD panel to set the default route

Explanation: Out-of-the-box, the recommended bring-up is to connect to the dedicated console port, log in with the default admin account, configure the dedicated management interface IP, and then access the Web GUI. ACOS does not start a DHCP client on data ports by default, and there is no ZTP cloud console for the standard Thunder line.

6Which ACOS interface type is logically separate from the data plane and used purely for administrative traffic such as SSH, GUI, SNMP, and aXAPI?

A.Management interface

B.Loopback 0

C.Ve 1

D.Ethernet 1

Explanation: ACOS provides a dedicated management interface that is on its own routing instance separate from data interfaces, isolating control-plane traffic. Loopbacks and VEs live on the data plane, and Ethernet 1 is a regular data interface that requires explicit access control to be used for management.

7An ACOS engineer wants to put physical port Ethernet 3 into VLAN 100 as an untagged member. Which CLI sequence is correct?

A.vlan 100 / untagged ethernet 3

B.interface ethernet 3 / switchport access vlan 100

C.vlan 100 / member ethernet 3 mode access

D.interface vlan 100 / port ethernet 3

Explanation: ACOS uses the 'vlan <id>' configuration block with 'untagged ethernet <list>' or 'tagged ethernet <list>' to bind ports. The other syntaxes resemble Cisco IOS or Junos but are not valid ACOS commands.

8Which ACOS object provides a Layer 3 routed interface for a VLAN and is typically used as the gateway for servers behind the device?

A.VE (Virtual Ethernet) interface

B.Bridge group

C.Trunk subinterface

D.Management VRF

Explanation: A VE (Virtual Ethernet) interface is the Layer 3 SVI on ACOS - it carries the IP address that hosts on a VLAN use as their default gateway. Bridge groups, trunk subinterfaces, and management VRFs do not serve that role on ACOS.

9Which ACOS Layer 3 deployment style places the Thunder device in the path of traffic with separate client-side and server-side subnets?

A.Routed (inline) mode

B.One-armed mode

C.Direct Server Return (DSR)

D.Transparent bridging mode

Explanation: Routed mode puts Thunder inline between clients and servers on different subnets, with each side as a routed VE. One-armed mode places clients and servers on the same subnet with Thunder beside them, and DSR returns server replies to clients without traversing the ADC.

10An admin sees output from 'show interfaces brief' indicating port Ethernet 4 is 'Disabled'. Which command brings it administratively up?

A.interface ethernet 4 / enable

B.interface ethernet 4 / no shutdown-now

C.interface ethernet 4 / set state up

D.system interface 4 reset

Explanation: ACOS uses 'enable' under the interface configuration to bring it up and 'disable' to take it down. 'no shutdown' is Cisco IOS syntax. The other options are not valid ACOS commands.

About the A10 ACOS Exam

The A10 Networks Certified Professional ACOS exam validates skills to administer A10 Thunder devices: configure ACOS via CLI and GUI, build aVCS device clusters, deploy VRRP-A high availability, partition the device with ADP and L3V, configure role-based administration, capture logs and SNMP traps, run aXAPI sessions, and troubleshoot Layer 2-3 deployments.

Questions

Not publicly disclosed scored questions

Time Limit

90 minutes

Passing Score

70%

Exam Fee

$200 (A10 Networks (delivered by Kryterion Global Testing Solutions))

A10 ACOS Exam Content Outline

20%

ACOS Platform, CLI, and Initial Setup

ACOS architecture, CLI navigation, configuration modes, interfaces, VLANs, IP routing, NTP, DNS, and saving running vs. startup config.

20%

Server Load Balancing (SLB) Fundamentals

Real servers, service groups, virtual servers, load balancing methods, health monitors, persistence templates, and source NAT.

15%

Layer 7 Features: SSL, aFleX, HTTP

SSL offload and end-to-end encryption, certificate management, aFleX TCL scripting, HTTP header insertion and rewriting, cookie persistence.

15%

High Availability: VRRP-A and aVCS

VRRP-A active-standby and N+M deployments, failover behavior, aVCS vMaster and vBlade roles, and centralized cluster configuration.

15%

Partitioning, GSLB, and Multi-Tenancy

Application Delivery Partitions (ADP), Layer 3 Virtualization (L3V) partitions, shared and private objects, and GSLB DNS-based load balancing.

15%

Operations: Logging, SNMP, aXAPI, Troubleshooting

Role-based admin, AAA, control plane logging, SNMP and A10 MIBs, aXAPI sessions, show commands, packet capture, and Thunder TPS DDoS basics.

How to Pass the A10 ACOS Exam

What You Need to Know

Passing score: 70%
Exam length: Not publicly disclosed questions
Time limit: 90 minutes
Exam fee: $200

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

A10 ACOS Study Tips from Top Performers

1Build a vThunder lab and configure every object from CLI before practicing in the GUI - exam scenarios assume you can read CLI output and predict the resulting behavior.

2Memorize the SLB object hierarchy: real server -> service group -> virtual server -> virtual port. Many distractors flip the order or mix template attachment points.

3Practice aFleX events (HTTP_REQUEST, HTTP_RESPONSE, CLIENT_ACCEPTED) and the difference between aFleX scripts and HTTP templates - they often solve overlapping problems with different tradeoffs.

4Know VRRP-A vs. aVCS at a sentence level: VRRP-A is high availability between devices, aVCS is centralized cluster configuration with one vMaster and one or more vBlades.

5Be fluent with ADP (Application Delivery Partitions) and L3V partitions - what is shared, what is private, and which objects can or cannot cross partition boundaries.

6Drill SSL templates: client SSL vs. server SSL, where you attach each, and how SNI, certificate chains, and SSL offload differ from end-to-end SSL.

7Walk through a GSLB DNS resolution end-to-end: zone, service, site, GSLB policy, and the metric order that selects the best site.

8Get comfortable with show commands (show slb virtual-server, show health monitor, show vrrp-a, show partition, show log) and basic packet capture so you can troubleshoot on exam scenarios.

Frequently Asked Questions

What is the A10 Networks Certified Professional ACOS exam?

The A10 Certified Professional credential validates an administrator's ability to deploy and manage A10 ACOS devices, primarily Thunder ADC. The exam tests CLI and GUI configuration, Layer 2-3 setup, aVCS centralized clustering, VRRP-A high availability, Application Delivery Partitions (ADP) and Layer 3 Virtualization (L3V), Server Load Balancing fundamentals, SSL offload and aFleX scripting, GSLB, role-based administration, AAA, control plane logging, SNMP, aXAPI, and basic troubleshooting using show commands and packet capture.

How long is the exam and what is the passing score?

The A10 Certified Professional exam is delivered in a 90-minute proctored session. The passing score is 70%, and candidates get one attempt per exam to pass. The exam consists of multiple-choice questions and may include scenario-based items that test how you apply ACOS knowledge to real Thunder deployments.

How much does the exam cost and how do I register?

The current A10 Certified Professional exam fee is approximately $200 USD. All A10 certification exams are delivered by Kryterion Global Testing Solutions. Candidates can register either after completing an A10 Networks technical training course or independently through Kryterion. Exams can be taken at a Kryterion testing center or remotely through Kryterion's online proctoring platform.

Is the A10 Networks certification still active?

Yes. A10 Networks launched the formal A10 Certified Professional (ACP) program in 2020, and the company continues to maintain System Administration and Application Delivery Control tracks aligned to current ACOS versions. Earning A10 Certified Professional certifications on five exams - with at least four on the same ACOS version - lets candidates apply for the higher A10 Certified Architect designation.

How long is the credential valid?

The A10 Networks Certified Professional designation is valid for three years from the completion date. To maintain the credential, candidates need to recertify by passing a current-version exam before the three-year window closes. Recertifying on the most recent ACOS version is required to keep the certification mapped to current product features.

What hands-on skills should I focus on?

Spend time in an A10 Thunder vThunder lab building configs from scratch: assign interfaces and VLANs, route Layer 3, create real servers and service groups, deploy a Layer 4 and a Layer 7 virtual server, attach health monitors, enable SSL offload with a certificate, write a small aFleX script, configure VRRP-A active-standby, partition the device with ADP and L3V, and capture troubleshooting evidence using show commands and packet capture.