Eccouncil 112-51 Practice Exam Questions & Answers
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· Last reviewed: October 5, 2026
· Prepared & Reviewed by the ValidExamDumps Editorial Team
Exam Facts
Eccouncil 112-51 Exam Details
Key details for this exam, checked against the published exam outline
75
Practice Questions (Our Bank)
120 minutes
Exam Duration
70%
Passing Score
- Exam Code
- 112-51
- Full Name
- Network Defense Essentials Exam
- Issuing Body
- EC-Council
- Question Format (Our Bank)
- Multiple Choice
- Delivery
- Online proctored (ECC Exam Center)
- Eligibility
- No prior cybersecurity knowledge or IT work experience required
- Validity
- 3 years
Practice Questions
Free 112-51 Practice Questions
Each question shows the correct answer and an explanation of why it is right
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Below are various authentication techniques.
1.Retina scanner
2.One-time password
3.DNA
4.Voice recognition
Identify the techniques that fall under biometric authentication.
Correct Answer:
A
Explanation
Biometric authentication is a type of authentication that uses the physical or behavioral characteristics of a person to verify their identity. Biometric authentication is more secure and convenient than other methods such as passwords or tokens, as biometric traits are unique, hard to forge, and easy to use. Some examples of biometric authentication techniques are retina scanner, DNA, and voice recognition. Retina scanner uses a low-intensity light beam to scan the pattern of blood vessels at the back of the eye, which is unique for each individual. DNA uses the genetic code of a person to match their identity, which is the most accurate and reliable biometric technique. Voice recognition uses the sound and pitch of a person's voice to verify their identity, which is influenced by factors such as anatomy, physiology, and psychology. These techniques fall under biometric authentication, as they use the physical or behavioral traits of a person to authenticate them. Reference:
Biometric Authentication - Week 2: Identification, Authentication, and Authorization
Biometric Authentication: What You Need To Know
Biometric Authentication Techniques
Which of the following techniques is referred to as a messaging feature that originates from a server and enables the delivery of data or a message from an application to a mobile device without any explicit request from the user?
Correct Answer:
A
Explanation
Push notifications are a technical security and mobile application delivery mechanism. A push notification originates from a server and delivers data or messages to a mobile device without the user having to request it. This is different from pull notifications where the device actively requests new information. Understanding push notifications matters for network defenders who need to control what data flows to and from mobile devices on their networks.
Messy, a network defender, was hired to secure an organization's internal network. He deployed an IDS in which the detection process depends on observing and comparing the observed events with the normal behavior and then detecting any deviation from it.
Identify the type of IDS employed by Messy in the above scenario.
Correct Answer:
C
Daniel, a networking specialist, identifies a glitch in a networking tool and fixes it on a priority using a system. Daniel was authorized to make a copy of computers programs while maintaining or repairing the system.
Which of the following acts was demonstrated in the above scenario?
Correct Answer:
B
Explanation
The DMCA is a US law that aims to protect the rights of digital content creators and owners. It prohibits the unauthorized copying, distribution, modification, or circumvention of digital content, such as software, music, movies, etc. The DMCA also provides exceptions for certain purposes, such as fair use, research, education, or maintenance and repair of systems. In the scenario, Daniel was authorized to make a copy of computer programs while maintaining or repairing the system, which falls under the DMCA exception for system maintenance and repair12. Reference: Network Defense Essentials - EC-Council Learning, Network Defense Essentials (NDE) | Coursera
In an organization, employees are restricted from using their own storage devices, and only the company's portable storage devices are allowed. As employees are carrying the company's portable device outside their premises, the data should be protected from unauthorized access.
Which of the following techniques can be used to protect the data in a portable storage device?
Correct Answer:
B
Explanation
Data encryption is the technique that can be used to protect the data in a portable storage device. Data encryption is the process of transforming data into an unreadable format using a secret key or algorithm. Only authorized parties who have the correct key or algorithm can decrypt and access the data. Data encryption provides security and privacy for the data stored on a portable storage device, such as a USB flash drive or an external hard drive, by preventing unauthorized access, modification, or disclosure. If the device is lost or stolen, the data will remain protected and inaccessible to the unauthorized user. Data encryption can be implemented using software or hardware solutions, such as BitLocker, VeraCrypt, or encrypted USB drives. Data encryption is one of the best practices for securely storing data on portable devices123. Reference:
7 Ways to Secure Sensitive Data on a USB Flash Drive, UpGuard, August 17, 2022
How to Protect Data on Portable Drives, PCWorld, January 10, 2011
Securely Storing Data, Security.org, December 20, 2022
Fernandez, a computer user, initiated an action to access a file located on a remote server. In this process, his account went through certain security constraints to check for any restrictions on his account with regard to access to the file.
Which of the following terms is referred to as a file in the above scenario?
Correct Answer:
D
Explanation
In access control terminology, an object is the resource being protected. In this scenario, the file on the remote server is the object. Fernandez is the subject, meaning the user or entity requesting access. The security constraints that checked his account for restrictions are the authorization controls. Understanding the difference between subjects and objects is fundamental to how access control systems work and enforce permissions.
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Domain 1: Network Security Fundamentals
Understand the foundations of network security including security goals, functions, and contributions of various network security protocols. This section equips network engineers and security specialists with knowledge of network dangers, weaknesses, and defense principles.
Domain 2: Identification, Authentication, and Authorization
Learn terminology, models, and core concepts of user and system identification, authentication, and authorization in network environments. Access control managers and security administrators will find practical guidance on implementing identity and access controls.
Sample questions from this domain above:
Q1Q6
Domain 3: Identity and Access Management (IAM) Concepts
This section gives security architects and IAM administrators an overview of IAM ideas, components, and its function in protecting network resources.
Domain 4: Administrative Controls for Network Security
The information in this section describes theTo safeguard network assets, compliance officers and security policy makers must follow the steps outlined in this section while creating and implementing security policies, standards, processes, and guidelines. It also entails being aware of the regulatory and legal environments that surround network security.
Sample question from this domain above:
Q4
Domain 5: Physical Controls for Network Security
For the purpose of safeguarding network infrastructure and data, this section highlights the significance of physical security measures, particularly for building managers and physical security staff. It discusses different physical security measures and how to use them.
Sample question from this domain above:
Q5
Domain 6: Technical Controls for Network Security
For network engineers and security architects, this part focuses on technical security measures for network systems and data.
Sample questions from this domain above:
Q2Q3
FAQ
112-51 Exam FAQ
Common questions about the exam itself
What are the prerequisites for taking the 112-51 Network Defense Essentials exam?
There are no prerequisites for the 112-51 exam. You do not need prior cybersecurity knowledge or IT work experience to sit for this certification.
How many questions are on the Network Defense Essentials 112-51 exam and how long is it?
The 112-51 exam contains 75 multiple choice questions and you have 120 minutes to complete it.
What score do I need to pass the 112-51 Network Defense Essentials exam?
You need to score 70% to pass the 112-51 Network Defense Essentials exam.
How long is the Network Defense Essentials certification valid after I pass 112-51?
The Network Defense Essentials certification remains valid for 3 years from your successful exam attempt. After 3 years, you will need to retake the exam to recertify.
Do I need to pay continuing education fees to maintain my Network Defense Essentials credential?
No, there are no continuing education fees or EC-Council Continuing Education Credits required to maintain your NDE certification during the 3-year validity period.
Where can I take the 112-51 Network Defense Essentials exam?
The 112-51 exam is available through the ECC Exam Center as an online proctored exam.
What job roles does the Network Defense Essentials 112-51 certification prepare me for?
NDE prepares you for roles like Help Desk Technician, Technical Support Specialist, Network Administrator, IT Security Specialist, Cybersecurity Technician, and Incident and Intrusion Analyst among others.
Is the Network Defense Essentials exam suitable for beginners with no IT background?
Yes, 112-51 is designed for students, graduates, and career starters with no prior experience. It covers security fundamentals and is aimed at high school and college students beginning their cybersecurity careers.
What topics make up the Network Defense Essentials 112-51 exam?
The exam covers six domains: Network Security Fundamentals, Identification and Authentication, IAM Concepts, Administrative Controls, Physical Controls, and Technical Controls for network security.
Can minors take the Network Defense Essentials 112-51 exam?
Minors can take the exam but must provide written consent from a parent or legal guardian along with a supporting letter from their school or educational institution.
