FC0-U71 Practice Test 28 — 15 Questions

Question 1

A network administrator is setting up a small office network for a new startup. The office has five computers, two printers, and one server. The administrator wants to ensure that all devices can communicate with each other and access the internet. The administrator has decided to use a switch and a router. Which of the following configurations is the MOST appropriate?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Connect all devices to the switch, then connect the switch to the router. A switch creates a local area network (LAN) by forwarding frames based on MAC addresses, allowing all five computers, two printers, and one server to communicate directly. The router provides network address translation (NAT) and a default gateway for internet access, so connecting the switch to the router enables all devices on the switch to reach the internet. This is the standard small office topology because the switch handles internal traffic efficiently at Layer 2, while the router handles Layer 3 routing and internet connectivity.

Answer

Connect the server and printers to the switch, computers to the router

Answer

Use a hub instead of a switch

Answer

Connect all devices directly to the router

Question 2

A developer needs to store a collection of student names and their corresponding grades. The data should be accessed quickly by student name. Which data structure is most appropriate?

Accepted Answer

Dictionary. A dictionary (also known as a hash map or associative array) stores key-value pairs, allowing O(1) average-time lookups by key. Since the developer needs to access grades quickly by student name, the dictionary's hashing mechanism directly maps each name to its corresponding grade, making it the most appropriate choice.

Answer

Array

Answer

Queue

Answer

Stack

Question 3

A security policy grants the following permissions: Read and List. Based on the policy, what actions are permitted by this policy?

Accepted Answer

Read and List. The policy explicitly grants both the Read and List actions, as is common in many policy configurations. The trap is that candidates may assume Read alone is granted, but List is a separate permission that must be explicitly included.

Answer

Read only

Answer

Read and Delete

Answer

Write and Read

Question 4

A network technician observes that a DHCP server is not issuing IP addresses to clients. The DHCP server is running on a Windows Server with a static IP of 192.168.1.10. Clients are on the same subnet. Which of the following should the technician check FIRST?

Accepted Answer

Whether the DHCP Server service is running. The most fundamental check when a DHCP server fails to issue IP addresses is whether the DHCP Server service itself is running. If the service is stopped, the server cannot respond to any DHCP Discover messages, regardless of scope configuration or network topology. Since the clients are on the same subnet, no router forwarding is required, making service status the logical first step.

Answer

Whether the DHCP scope is full

Answer

Whether a router is forwarding DHCP broadcasts

Answer

Whether the clients have a wireless connection

Question 5

A developer runs a SQL query against a database and receives the error shown. Which of the following actions should the developer take first to resolve the issue?

Accepted Answer

Check the table definition to confirm column names.. The error indicates that the column 'user_id' does not exist in the 'users' table. The most logical first step is to check the table definition to confirm the actual column names, as the developer may have misspelled the column name or used the wrong case. This avoids unnecessary destructive actions like dropping the table or making incorrect assumptions about case sensitivity.

Answer

Drop and recreate the 'users' table with the correct column.

Answer

Change 'user_id' to 'UserID' to match case-sensitive settings.

Answer

Add quotes around the table name.

Question 6

A small business has 20 employees using a mix of wired and wireless devices. The network uses a single router with built-in 4-port switch and Wi-Fi. Recently, employees have reported intermittent connectivity drops, especially during peak hours. The technician notices that the router's CPU usage is consistently at 90% or higher. The business cannot afford to replace the router immediately. Which of the following actions would BEST improve the situation without purchasing new hardware?

Accepted Answer

Configure VLANs to separate wired and wireless traffic. Configuring VLANs separates wired and wireless traffic into distinct broadcast domains, reducing the amount of broadcast traffic and collisions that the router's CPU must process. This lowers CPU overhead, which directly addresses the 90% CPU usage causing intermittent drops, without requiring new hardware.

Answer

Disable Quality of Service (QoS) settings

Answer

Disable the Wi-Fi network and require all devices to connect via Ethernet

Answer

Assign static IP addresses to all devices

Question 7

A web application is not responding to user input. The developer checks the code and finds an infinite loop. Which change will fix the infinite loop?

Accepted Answer

Add a counter variable that increments and check it in the condition. An infinite loop occurs when the loop's termination condition is never met. By adding a counter variable that increments with each iteration and checking it in the condition, the loop will eventually exit when the counter reaches a specified limit, thus breaking the infinite loop.

Answer

Remove the loop body

Answer

Add a break statement

Answer

Change from a for loop to a while loop

Question 8

A database administrator needs to modify the 'Phone' column in the 'Employees' table to allow up to 15 characters. Which SQL statement should the administrator use?

Accepted Answer

ALTER TABLE Employees ALTER COLUMN Phone VARCHAR(15);. The ALTER TABLE statement is used to modify an existing table's structure, and the ALTER COLUMN clause specifically changes a column's data type or size. Option B correctly uses ALTER TABLE Employees ALTER COLUMN Phone VARCHAR(15) to change the Phone column to allow up to 15 characters, which is the standard SQL syntax for this operation.

Answer

CREATE TABLE Employees (Phone VARCHAR(15));

Answer

UPDATE Employees SET Phone = VARCHAR(15);

Answer

INSERT INTO Employees (Phone) VALUES ('123456789012345');

Question 9

A company wants to use a cloud service where they provide their own operating system and applications, but the provider manages the physical hardware and virtualization layer. Which cloud service model does this describe?

Accepted Answer

Infrastructure as a Service (IaaS). Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet, where the customer manages the operating system, applications, and middleware, while the cloud provider handles the physical hardware, storage, and network infrastructure. In this model, the provider manages the virtualization layer (hypervisor) and underlying physical servers, but the customer retains full control over the OS and applications, matching the scenario exactly.

Answer

Platform as a Service (PaaS)

Answer

Desktop as a Service (DaaS)

Answer

Software as a Service (SaaS)

Question 10

Which TWO of the following are types of cloud computing service models?

Accepted Answer

Platform as a Service (PaaS). Platform as a Service (PaaS) is a cloud computing service model that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the underlying infrastructure. It includes operating systems, middleware, development tools, and database management, enabling developers to focus solely on coding and deploying applications.

Answer

Virtual Private Network (VPN)

Answer

Local Area Network (LAN)

Answer

On-Premises

Question 11

A user notices that the computer is running slowly and opens Task Manager to check running processes. Based on the exhibit, which process is using the most memory?

Accepted Answer

System. The System process (PID 4) is using the most memory at 44,236 K, as shown in the Memory column of Task Manager. This process represents the Windows kernel and core OS services, and its memory usage is typically high because it manages system resources, drivers, and hardware abstraction. In this exhibit, the Memory column is sorted by usage, and System appears at the top with the highest value.

Answer

System Idle Process

Answer

svchost.exe (PID 696)

Answer

csrss.exe

Question 12

An organization implements a security control that requires users to swipe a smart card and then enter a PIN to access a secure facility. Which combination of authentication factors does this represent?

Accepted Answer

Something you have and something you know. Smart card is 'something you have' and PIN is 'something you know', making it two-factor authentication using different factor types.

Answer

Something you are and something you have

Answer

Something you know and something you do

Answer

Something you know and something you are

Question 13

An employee receives a phone call from someone claiming to be from the IT department. The caller states there is a security issue and requests the employee's login credentials to 'fix the problem'. What should the employee do?

Accepted Answer

Hang up and call the IT department using the official number.. The employee should never provide credentials in response to an unsolicited request, even if the caller sounds knowledgeable. Hanging up and calling the IT department using the official number ensures the request is verified through a trusted communication channel, preventing a social engineering attack such as phishing or pretexting.

Answer

Give a temporary password to see if the issue resolves.

Answer

Provide the credentials because the caller sounds knowledgeable.

Answer

Ask for a call-back number and verify the caller's identity later.

Question 14

A company wants to protect its network from unauthorized external access. Which of the following devices should be configured to filter traffic based on port and protocol?

Accepted Answer

Network firewall. A network firewall examines incoming and outgoing traffic and can block or allow based on rules involving ports and protocols, providing a barrier between internal and external networks.

Answer

Host-based firewall

Answer

VPN concentrator

Answer

Antivirus software

Question 15

A developer sees the above output. After a recent commit, the application crashed due to a null pointer. Which commit likely introduced the null pointer issue?

Accepted Answer

def456. The commit def456 is the most recent commit before the crash, and since the null pointer exception occurred after this commit, it is the most likely source of the bug. In version control systems like Git, a null pointer error typically indicates that a recent code change introduced a reference to an object that was not properly initialized. The developer should inspect the changes in def456 for uninitialized variables or missing null checks.

Answer

abc123

Answer

012jkl

Answer

789ghi