WGU인증Foundations-of-Computer-Science시험은 현재 치열한 IT경쟁 속에서 열기는 더욱더 뜨겁습니다. 응시자들도 더욱더 많습니다. 하지만 난이도난 전혀 낮아지지 않고 이지도 어려운 시험입니다. 어쨌든 개인적인 지식 장악도 나 정보기술 등을 테스트하는 시험입니다. 보통은WGU인증Foundations-of-Computer-Science시험을 넘기 위해서는 많은 시간과 신경이 필요합니다.
| Section | Objectives |
|---|---|
| Topic 1: Operating Systems & Architecture | - System Architecture
|
| Topic 2: Computer Science Fundamentals | - Core CS Concepts
|
| Topic 3: Programming Foundations | - Programming Concepts
|
| Topic 4: Data & Security Basics | - Security Fundamentals
|
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질문 # 55
What happens if one element of a NumPy array is changed to a string?
정답：D
설명：
A central rule in NumPy is that an ndarray has a single, fixed data type called itsdtype. That dtype is chosen when the array is created (for example, int64, float64, etc.), and it normally does not change just because you assign a new value into one element. When you attempt an assignment, NumPy tries tocastthe assigned value into the array's existing dtype. If the cast is possible, the assignment succeeds; if the cast is impossible, NumPy raises an error.
So, if you have a numeric array such as arr = np.array([1, 2, 3]), its dtype is an integer type. Trying arr[0] =
"hello" cannot be converted into an integer, so NumPy raises a ValueError (a casting/conversion error). This is exactly the behavior textbooks highlight when contrasting NumPy arrays with Python lists: lists can hold mixed types freely, but NumPy arrays trade that flexibility for speed and memory efficiency via uniform typing.
Option A is a common misconception. While NumPy may "upcast" values to a more general dtype at array creation time when mixed types are provided (e.g., numbers and strings in the same constructor), a pre-existing numeric array will not automatically convert itself into a string array during a single- element assignment. Options C and D do not reflect NumPy's assignment rules.
질문 # 56
What statistical measure can be used to detect outliers in a dataset using NumPy?
정답：C
설명：
Outlier detection often relies on measuring how far values deviate from a "typical" center. While variance and standard deviation can be used in simple z-score based methods, they arenot robust: a few extreme outliers can inflate the mean and standard deviation, masking the very outliers you want to find. A widely taught robust alternative is themedian absolute deviation (MAD), which is based on the median rather than the mean and therefore resists distortion by extreme values.
MAD is computed by first taking the median of the data, then computing the absolute deviation of each point from that median, and finally taking the median of those deviations. Because medians are stable under extreme values, MAD provides a strong baseline for identifying unusually distant points. Many textbooks and data analysis references present MAD as a robust scale estimator for outlier detection, often combined with a threshold rule such as flagging points whose deviation exceeds a constant multiple of MAD (with a scaling factor sometimes used to make it comparable to standard deviation under normality assumptions).
In NumPy, you can implement MAD using np.median() and np.abs(). Mode is generally not useful for continuous numeric outlier detection, and variance/standard deviation are more sensitive to outliers than MAD. Thus, among the given options, the best statistical measure for detecting outliers robustly is the median absolute deviation.
질문 # 57
What is the purpose of user management and access control in a networked environment?
정답：C
설명：
In a networked environment, user management and access control exist to ensure that resources are used securely, appropriately, and accountably. The core idea isauthorization: defining what each user (or group of users) is allowed to do-read files, modify data, access applications, administer systems, and so on. This is commonly guided by the principle ofleast privilege, which states that users should receive only the permissions necessary to perform their tasks. Proper access control reduces the damage from mistakes and limits the impact of compromised accounts.
User management also includesauthenticationsupport (ensuring a user is who they claim to be) and administrative functions such as creating accounts, assigning roles, revoking access, and enforcing policies (password rules, multi-factor authentication requirements, session timeouts). In many systems, access control is implemented through models like discretionary access control (DAC), role-based access control (RBAC), or mandatory access control (MAC), each with different security properties.
Option B correctly reflects this: the goal is to establish permissions and to monitor or audit usage (logging access, tracking changes, detecting suspicious behavior). Option A is wrong because equal access is rarely secure or practical. Option C is the opposite of secure practice. Option D is too absolute:
systems typically restrict some users from some confidential resources, not all users from all confidential documents.
질문 # 58
Which protocol provides encryption while email messages are in transit?
정답：B
설명：
"Encryption in transit" means protecting data while it moves across a network so that eavesdroppers cannot read or modify it. For email systems, this protection is most commonly provided byTLS (Transport Layer Security). TLS is a cryptographic protocol that can wrap application protocols (including mail protocols) to provide confidentiality, integrity, and server (and sometimes client) authentication. In practice, TLS is used to secure connections such as SMTP submission (often with STARTTLS or implicit TLS), IMAP over TLS, and POP3 over TLS. Textbooks present TLS as the standard successor to SSL and the foundation of secure communication on the modern Internet.
The other options are not correct in this context. FTP is a file transfer protocol and is traditionally unencrypted unless paired with additional security mechanisms (e.g., FTPS, which uses TLS, or SFTP, which uses SSH). HTTP is a web protocol; it becomes encrypted only when used as HTTPS, which again relies on TLS underneath. IMAP is an email retrieval protocol, butIMAP itself is not the encryption protocol- IMAP can be run over TLS (IMAPS) to become secure.
Therefore, the protocol that provides encryption while email messages (or email protocol traffic) are in transit is TLS.
질문 # 59
How is a NumPy array named data with 6 elements reshaped into a 2x3 array?
정답：B
설명：
Reshaping is the operation of changing the "view" of an array so that the same elements are arranged with new dimensions. In NumPy, reshaping is possible when the total number of elements stays the same. A 2x3 array contains 6 elements, so a 1D array data of length 6 can be reshaped into shape (2, 3) without adding or removing values. Textbooks stress this invariant: the product of the dimensions must equal the original size.
NumPy provides two standard reshaping interfaces: the function np.reshape(data, (2, 3)) and the method data.
reshape(2, 3) (or data.reshape((2, 3))). Option A is correct because it uses the official NumPy function with the proper arguments: the original array and the target shape. The shape is passed as a tuple describing rows and columns.
Option B is incorrect because np_reshape is not the correct NumPy function name, and it references an unrelated identifier list. Option C is incorrect because NumPy arrays do not provide a set_shape method like that. Option D is not valid NumPy syntax for reshaping.
Reshaping is fundamental in data analysis and machine learning: it converts flat vectors into matrices, prepares batches of samples, and aligns dimensions for matrix multiplication and broadcasting.
질문 # 60
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