FC0-U71 Practice Test 6 — 10 Questions

Question 1

A developer is debugging a program that is producing incorrect output. Which of the following are common debugging techniques? (Choose three.)

Accepted Answer

Using a debugger. Using a debugger (A) is a core debugging technique because it lets the developer set breakpoints, step through execution line by line, inspect variables and the call stack, and observe the program's state at the exact point where output diverges from expectations. Code review (B) is also a common debugging technique: a careful reading of the source, often by a second developer, can reveal logic errors, off-by-one mistakes, incorrect conditionals, or misuse of APIs that cause incorrect output. Adding print statements (C) is a classic and widely used technique, inserting temporary logging at key points to trace variable values and control flow and thereby localize the faulty logic. Reinstalling the operating system (D) is not a debugging technique for a program producing wrong output; it is a drastic system-recovery action that would not address a logic or coding defect. Changing the program requirements (E) is not debugging either, since debugging means finding and fixing the defect in the code, not redefining what the program is supposed to do.

Answer

Reinstalling the operating system

Answer

Changing the program requirements

Question 2

An organization is implementing a new payroll system. Before final deployment, a group of actual payroll employees test the system to ensure it meets their business needs and processes payroll correctly. Which testing phase is this?

Accepted Answer

User acceptance testing. User acceptance testing (UAT) is the phase where actual end users—in this case, payroll employees—validate that the system meets real business requirements and performs its intended function (processing payroll correctly) before going live. Because the testers are the people who will actually use the system in production, their validation confirms fitness for purpose rather than just technical correctness.

Answer

Unit testing

Answer

System testing

Answer

Integration testing

Question 3

Based on the exhibit, what is the most likely cause of the error?

Accepted Answer

Disk error. The exhibit shows a 'Disk Boot Failure' or similar error, which indicates the system cannot find a valid boot sector on the hard drive. This is most commonly caused by a disk error, such as a corrupted master boot record (MBR), bad sectors, or a disconnected data cable. Option D is correct because the error message directly points to a storage device issue, not a network, power, or memory problem.

Answer

Network outage

Answer

Power supply failure

Answer

Bad memory stick

Question 4

A technician needs to identify a network interface on a device. Which notational system is most commonly associated with MAC addresses?

Accepted Answer

Hexadecimal. MAC addresses are 48-bit identifiers typically written as six groups of two hexadecimal digits separated by colons or hyphens (e.g., 00:1A:2B:3C:4D:5E). Hexadecimal is the notational system most commonly associated with MAC addresses because each byte maps cleanly to two hex digits, making the address compact and readable. This is why network tools, ipconfig/ifconfig output, and switch ARP tables all display MAC addresses in hex.

Answer

Binary

Answer

Octal

Answer

Decimal

Question 5

A developer is creating a cloud-based application that needs to authenticate third-party services before allowing access to its API. The developer decides to use a method where each third-party service receives a unique key that must be included in each API request. This method is known as:

Accepted Answer

API key authentication. API key authentication issues a unique key to each third-party service, which is then included in every API request (typically in a header or query string) so the server can identify and authorize the caller. This matches the scenario exactly: unique keys per consumer, presented on each request. It is a lightweight, stateless credential mechanism distinct from user-session or delegated-authorization models.

Answer

Session-based authentication

Answer

Basic authentication

Answer

OAuth

Question 6

A small business has a single server running Windows Server 2019 that acts as a domain controller, file server, and DHCP server. The server has a single network interface with IP address 192.168.1.10/24. The office has 30 client computers running Windows 10. All clients obtain IP addresses automatically. The network uses a single unmanaged switch. The internet connection is provided by a cable modem with IP 192.168.1.1. The server is configured with a static IP of 192.168.1.10, and the DHCP scope is 192.168.1.100-192.168.1.200. Recently, users have reported that they cannot access the internet. The technician checks that the cable modem is online and that the server can ping the modem. The technician runs 'ipconfig /all' on a client and sees: IP: 192.168.1.101, Subnet: 255.255.255.0, Default Gateway: 192.168.1.10, DNS: 192.168.1.10. The client can ping the server (192.168.1.10) but cannot ping the modem (192.168.1.1). What is the most likely cause?

Accepted Answer

Change the DHCP scope option for the default gateway to 192.168.1.1. The DHCP scope is configured with the default gateway option set to 192.168.1.10 (the server's IP), but the actual default gateway for internet access is the cable modem at 192.168.1.1. Since clients receive their gateway via DHCP, they are sending all off-subnet traffic to the server, which is not configured to route to the internet. Changing the DHCP scope option for the default gateway to 192.168.1.1 will allow clients to route internet traffic through the modem.

Answer

Disable the Windows Firewall on the server to allow traffic

Answer

Replace the cable modem as it is not routing traffic correctly

Answer

Configure the DNS server to forward queries to 8.8.8.8

Question 7

A computer has 8 GB of RAM. If the operating system and applications are using 3.2 GB, how much RAM is available for other processes?

Accepted Answer

4.8 GB. Available RAM is total RAM minus RAM in use: 8 GB − 3.2 GB = 4.8 GB. This is a straightforward subtraction problem testing basic memory capacity arithmetic.

Answer

11.2 GB

Answer

5.8 GB

Answer

3.2 GB

Question 8

Which coding best practice improves code readability and maintainability?

Accepted Answer

Using meaningful variable names. Using meaningful variable names (option B) is a core coding best practice because it makes the code self-documenting, allowing other developers (or the original author after time) to quickly understand the purpose of each variable without needing extensive comments. This directly improves both readability and maintainability, as changes can be made with lower risk of misinterpretation. In contrast, practices like using global variables or hard-coding values obscure logic and create dependencies that are difficult to manage.

Answer

Using global variables for all data

Answer

Hard-coding values whenever possible

Answer

Writing long, single functions

Question 9

During a sprint retrospective, the team identifies that too many bugs are being discovered late in the development cycle. They decide to introduce a practice where developers write tests for individual functions before coding the functions themselves. This approach is an example of:

Accepted Answer

Unit testing. Writing tests for individual functions before writing the functions themselves is the definition of unit testing, and doing so before coding is specifically test-driven development (TDD). Unit tests isolate the smallest testable pieces of code (functions, methods) to verify correctness. This matches the scenario's focus on individual functions and early bug detection.

Answer

User acceptance testing

Answer

Integration testing

Answer

System testing

Question 10

A developer is working on a collaborative software project and uses Git for version control. The developer creates a new feature on a separate branch. After completing the feature, what is the typical next step to integrate the changes into the main branch?

Accepted Answer

Merge the feature branch into the main branch. After completing work on a feature branch, the typical next step is to merge the feature branch into the main branch to integrate the changes. This is the standard Git workflow: create a branch, commit changes, then merge back into the mainline (often via a pull request). Merging combines the histories and brings the feature into the main branch.

Answer

Commit the changes directly to the main branch

Answer

Delete the feature branch without merging

Answer

Push the branch to the remote repository