CompTIA ITF+ FC0-U61 FC0-U61 Questions 976–986 | Page 14/14

976

MCQhard

A server in a data center is running a critical application. The server is connected to a managed switch via two network cables for redundancy (link aggregation). Recently, the server experienced intermittent connectivity issues. The network logs show that every few hours, one of the links goes down and then comes back up within a minute. The other link remains up. The server's team reports no errors in the server logs. What is the most likely cause of this issue?

A.The switch's uplink port is faulty

B.The switch is experiencing broadcast storms

C.The network cable is poorly terminated

D.The server's network adapter is overheating

AnswerC

Poor termination can cause intermittent connectivity on a single cable.

Why this answer

Option C is correct because a poorly terminated cable can cause intermittent physical-layer issues such as impedance mismatches or partial breaks, which lead to link flaps (link down/up events) without generating errors in the server's operating system logs. In a link aggregation group (LAG) using LACP or static aggregation, a single faulty cable will cause only that link to drop, while the other link continues to carry traffic, matching the described symptom of one link cycling every few hours.

Exam trap

The trap here is that candidates often assume software or configuration issues (like broadcast storms or adapter overheating) when the symptom of a single link flapping in a LAG points directly to a physical-layer problem with that specific cable, not a systemic or hardware-wide fault.

How to eliminate wrong answers

Option A is wrong because a faulty switch uplink port would affect all traffic passing through that uplink, not just one specific link in the aggregation group, and would likely cause connectivity loss for multiple devices or the entire switch. Option B is wrong because a broadcast storm would overwhelm the network with broadcast frames, causing both links to be saturated and the server to experience general connectivity loss, not just one link flapping while the other remains stable. Option D is wrong because an overheating network adapter typically causes the entire adapter to fail or throttle, affecting both links simultaneously (since they share the same physical adapter), and would likely produce temperature-related errors in the server logs.

Full explanation →

977

Multi-Selecthard

An organization is implementing a defense-in-depth strategy. Which THREE of the following are considered security controls that can be used? (Choose THREE.)

Select 3 answers

A.Firewall

B.Antivirus software

C.Single sign-on

D.Encryption

E.Acceptable use policy

AnswersA, B, D

A firewall is a network security control that filters traffic.

Why this answer

Defense-in-depth uses multiple layers of security controls. Firewalls, antivirus, and encryption are different types of controls that provide overlapping protection.

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978

Multi-Selecthard

A technician is explaining the difference between volatile and non-volatile memory to a trainee. Which TWO of the following are examples of volatile memory? (Select TWO.)

Select 2 answers

A.ROM

B.BIOS firmware

C.DDR4 RAM

D.L3 cache

E.SSD

AnswersC, D

DDR4 is a type of volatile RAM.

Why this answer

Volatile memory loses data when power is off. RAM (including DDR4 and DDR5) and cache memory (L1/L2/L3) are volatile. ROM and SSDs are non-volatile.

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979

MCQmedium

A technician is explaining data storage to a customer. Which of the following best describes the difference between a bit and a byte?

A.A bit is a single binary digit; a byte is 8 bits.

B.A bit is 8 bits; a byte is 16 bits.

C.A bit is 4 bits; a byte is 8 bits.

D.A bit is 16 bits; a byte is 32 bits.

AnswerA

Correct definition.

Why this answer

A bit is a single binary digit (0 or 1), and a byte consists of 8 bits.

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980

MCQmedium

Which data structure is best for storing a collection of key-value pairs?

A.Queue

B.Array

C.Dictionary

D.List

AnswerC

Dictionaries store key-value pairs.

Why this answer

A dictionary (also known as a hash map or associative array) is specifically designed to store key-value pairs, allowing efficient insertion, deletion, and lookup based on a unique key. In computing, this structure uses a hash function to compute an index into an array of buckets, enabling average O(1) time complexity for operations, which is ideal for scenarios like caching or configuration settings.

Exam trap

The trap here is that candidates often confuse a list or array with a dictionary because they think of 'indexing' as key-based, but lists/arrays only support integer indices, not arbitrary keys like strings or objects.

How to eliminate wrong answers

Option A is wrong because a queue is a FIFO (First-In, First-Out) data structure used for ordered processing, not for storing key-value pairs. Option B is wrong because an array stores elements indexed by integer positions, not by arbitrary keys, making it unsuitable for associative lookups. Option D is wrong because a list (e.g., linked list or dynamic array) stores elements in a linear sequence, requiring O(n) search time to find a value by key, and does not natively support key-value mapping.

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981

MCQeasy

Which of the following is an example of open-source software license?

A.Freeware

B.GPL

C.Shareware

D.Freemium

AnswerB

GNU General Public License is a common open-source license.

Why this answer

The GNU General Public License (GPL) is a well-known open-source license.

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982

MCQhard

After deploying a new version of a web application, the QA team runs a set of test cases that were previously executed on the old version to ensure that existing functionality still works correctly. This testing is performed to detect any unintended side effects of the changes. What type of testing is this?

A.Integration testing

B.Smoke testing

C.Acceptance testing

D.Regression testing

AnswerD

Regression testing re-runs previous tests to ensure no regressions.

Why this answer

Regression testing verifies that new code changes do not break existing functionality.

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983

MCQeasy

A user wants to create a backup of important files stored on a hard drive. Which type of application is most appropriate for this task?

A.Word processor

B.Antivirus software

C.File manager

D.Web browser

AnswerC

File managers can copy files to another drive or folder for backup.

Why this answer

A file manager (such as Windows File Explorer or macOS Finder) is the most appropriate application for creating a backup of important files because it provides direct access to the file system, allowing users to copy, move, and organize files between storage locations. Unlike specialized backup software, a file manager can manually duplicate files to an external drive or cloud-synced folder without additional features like scheduling or compression, but it fully supports the core task of file duplication for backup purposes.

Exam trap

The trap here is that candidates may confuse 'backup' with 'protection' and choose antivirus software, thinking it safeguards files from loss, when in fact backup requires copying data to a separate location, not just scanning for threats.

How to eliminate wrong answers

Option A is wrong because a word processor is designed for creating and editing text documents, not for managing or copying files; it cannot access the file system to perform backup operations. Option B is wrong because antivirus software is intended to detect, prevent, and remove malicious software, not to copy or back up user files; it may interfere with backup processes but is not a tool for creating backups. Option D is wrong because a web browser is used to retrieve and display web content via HTTP/HTTPS protocols; it has no capability to interact with local file storage for copying files to a backup destination.

Full explanation →

984

MCQmedium

A user wants to synchronize contacts and calendar events between their Android smartphone and tablet. Which service is MOST likely used for this synchronization?

A.Bluetooth pairing

B.Microsoft Exchange ActiveSync

C.iCloud

D.Google account sync

AnswerD

Android devices use Google account sync for contacts, calendar, and more.

Why this answer

Google account sync is the native synchronization service for Android devices, allowing contacts, calendar, and other data to sync seamlessly.

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985

Multi-Selecthard

A development team is working on a critical update to an e-commerce website. After deploying the update, they must ensure that existing features (like login and search) still work correctly. Additionally, they want to test the new checkout flow end-to-end. Which TWO types of testing should the team perform?

Select 2 answers

A.Unit testing

B.Integration testing

C.Regression testing

D.System testing

E.User acceptance testing

AnswersC, D

Regression testing ensures existing features still work after changes.

Why this answer

Regression testing (C) is correct because it verifies that existing features like login and search still work after deploying the update, ensuring no new defects were introduced. System testing (D) is correct because it validates the entire integrated system, including the new checkout flow end-to-end, against the specified requirements.

Exam trap

Cisco often tests the distinction between regression testing and integration testing, where candidates mistakenly choose integration testing for verifying existing features, not realizing integration testing only checks module interfaces, not the full set of unchanged functionalities.

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986

MCQeasy

Refer to the exhibit. A user cannot access the internet. What does this output indicate?

A.The default gateway cannot reach the remote network

B.The user's IP address is invalid

C.The DNS server is down

D.The local network cable is unplugged

AnswerA

The gateway reports destination unreachable, indicating a routing problem.

Why this answer

The output shows a successful ping to the default gateway (192.168.1.1) but a failed ping to a remote IP (8.8.8.8). This indicates that the user's local network connectivity is intact, but the default gateway cannot forward traffic to the remote network, likely due to a missing or incorrect route on the gateway or an upstream connectivity issue.

Exam trap

The trap here is that candidates assume a successful ping to the default gateway means full internet connectivity, but the question tests the understanding that the gateway itself may not have a route to external networks.

How to eliminate wrong answers

Option B is wrong because the user's IP address is valid, as evidenced by the successful ping to the default gateway, which requires a properly configured IP address and subnet mask. Option C is wrong because the DNS server being down would not affect a ping to an IP address (8.8.8.8), which bypasses DNS resolution entirely. Option D is wrong because if the local network cable were unplugged, the ping to the default gateway would fail, not succeed.

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CompTIA ITF+ FC0-U61 (FC0-U61) — Questions 976–986