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37. Frage
What is the response from a closed TCP port which is behind a firewall?
Antwort: B
38. Frage
Which SMB (Server Message Block) network protocol versions are vulnerable to the EternalBlue (MS17-010) Windows exploit?
Antwort: A
Begründung:
EternalBlue (MS17-010) is an exploit targeting a buffer overflow in Microsoft's SMB (Server Message Block) implementation, leaked by the Shadow Brokers in 2017. SMB enables file/printer sharing:
SMBv1 (1980s): Legacy, used in Windows NT/XP.
SMBv2 (2006, Vista): Enhanced performance/security.
SMBv3 (2012, Windows 8): Adds encryption, multichannel.
Vulnerability:
EternalBlue exploits a flaw in SMBv1's SRVNET driver (srv.sys), allowing remote code execution via crafted packets. Microsoft patched it in March 2017 (MS17-010).
Affected OS: Windows XP to Server 2016 (pre-patch), if SMBv1 enabled.
Proof: WannaCry/NotPetya used it, targeting port 445/TCP.
SMBv1 Only: The bug resides in SMBv1's packet handling (e.g., TRANS2 requests). SMBv2/v3 rewrote this code, immune to the specific overflow.
Microsoft: Post-patch, SMBv1 is disabled by default (Windows 10 1709+).
Security Implications: CNSP likely stresses disabling SMBv1 (e.g., via Group Policy) and patching, as EternalBlue remains a threat in legacy environments.
Why other options are incorrect:
B, C: SMBv2/v3 aren't vulnerable; the flaw is SMBv1-specific.
D: SMBv2 isn't affected, only SMBv1.
Real-World Context: WannaCry's 2017 rampage hit unpatched SMBv1 systems (e.g., NHS), costing billions.
39. Frage
Which of the following is a valid DNS record type?
Antwort: C
Begründung:
DNS (Domain Name System) records define how domain names are mapped to various types of data, each serving a specific purpose in network operations. The question asks for valid DNS record types, and all listed options are recognized.
Why D is correct:
A . NAPTR record: The Naming Authority Pointer (NAPTR) record is used for service discovery and mapping domain names to services, protocols, and ports (e.g., in SIP or ENUM systems).
B . SRV record: The Service (SRV) record specifies the hostname and port for specific services (e.g., LDAP, XMPP), aiding in service location.
C . TXT record: The Text (TXT) record stores arbitrary text data, often for SPF, DKIM, or domain verification.
All are valid DNS record types per RFC standards and CNSP documentation, making "All of the above" the correct answer.
Why other options are incomplete: A, B, or C alone exclude other valid types listed, so D is the most comprehensive response.
40. Frage
Which one of the following is a phishing email?
Antwort: B
Begründung:
The screenshot shows an email labeled "B" with the subject "Verify your email address" purportedly from Apple. To determine if this is a phishing email, we need to analyze its content and characteristics against common phishing indicators as outlined in CNSP documentation. Since option A is not provided in the screenshot, we will evaluate email B and infer the context for A.
Analysis of Email B:
Sender and Branding: The email claims to be from "Apple Support" and includes an Apple logo, which is a common tactic to establish trust. However, phishing emails often impersonate legitimate brands like Apple to deceive users.
Subject and Content: The subject "Verify your email address" and the body requesting the user to verify their email by clicking a link ("Verify Your Email") are typical of phishing attempts. Legitimate companies like Apple may send verification emails, but the tone and context here raise suspicion.
Link Presence: The email contains a clickable link ("Verify Your Email") that is purportedly for email verification. The screenshot does not show the URL, but phishing emails often include malicious links that lead to fake login pages to steal credentials. CNSP emphasizes that unsolicited requests to click links for verification are a red flag.
Urgency and Vague Instructions: The email includes a statement, "If you did not make this change or believe an unauthorized person has accessed your account, click here to cancel and secure your account." This creates a sense of urgency, a common phishing tactic to prompt immediate action without critical thinking.
Generic Greeting: The email starts with "Dear User," a generic greeting often used in phishing emails. Legitimate companies like Apple typically personalize emails with the user's name.
Suspicious Elements: The email mentions "your Apple ID (example@icloud.com)," which is a placeholder rather than a specific email address, further indicating a mass phishing campaign rather than a targeted, legitimate communication.
Phishing Indicators (per CNSP):
CNSP documentation on phishing identification lists several red flags:
Unsolicited requests for verification or account updates.
Generic greetings (e.g., "Dear User" instead of a personalized name).
Presence of links that may lead to malicious sites (not verifiable in the screenshot but implied).
Urgency or threats (e.g., "click here to cancel and secure your account").
Impersonation of trusted brands (e.g., Apple).
Email B exhibits multiple indicators: the generic greeting, unsolicited verification request, urgent call to action, and impersonation of Apple.
Option A Context:
Since the screenshot only shows email B, and the correct answer is "Only B," we can infer that email A (not shown) does not exhibit phishing characteristics. For example, A might be a legitimate email from Apple with proper personalization, no suspicious links, or a different context (e.g., a purchase confirmation rather than a verification request).
Evaluation of Options:
1. Only A: Incorrect, as email A is not shown, and the correct answer indicates B as the phishing email.
2. Only B: Correct. Email B shows clear phishing characteristics, such as impersonation, a generic greeting, an unsolicited verification link, and urgency, aligning with CNSP's phishing criteria.
3. Both A and B: Incorrect, as A is implied to be non-phishing based on the correct answer.
4. None of the above: Incorrect, as B is a phishing email.
Conclusion: Email B is a phishing email due to its impersonation of Apple, generic greeting, unsolicited verification request with a link, and use of urgency to prompt action. Since A is not shown but implied to be non-phishing, the correct answer is "Only B."
41. Frage
What kind of files are "Dotfiles" in a Linux-based architecture?
Antwort: A
Begründung:
In Linux, file visibility is determined by naming conventions, impacting how files are listed or accessed in the file system.
Why D is correct: "Dotfiles" are files or directories with names starting with a dot (e.g., .bashrc), making them hidden by default in directory listings (e.g., ls requires -a to show them). They are commonly used for user configuration, as per CNSP's Linux security overview.
Why other options are incorrect:
A: Library files (e.g., in /lib) aren't inherently hidden.
B: Driver files (e.g., kernel modules in /lib/modules) aren't dotfiles by convention.
C: System files may or may not be hidden; "dotfiles" specifically denotes hidden status.
42. Frage
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