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NEW QUESTION # 36
Which of the following files has the SUID permission set?
-rwxr-sr-x 1 root root 4096 Jan 1 00:00 myfile
-rwsr-xr-x 1 root root 4896 Jan 1 08:00 myprogram
-rw-r--r-s 1 root root 4096 Jan 1 00:00 anotherfile
Answer: B
Explanation:
In Linux/Unix, file permissions are displayed in a 10-character string (e.g., -rwxr-xr-x), where the first character is the file type (- for regular files) and the next nine are permissions for user (owner), group, and others (rwx = read, write, execute). Special bits like SUID (Set User ID) modify execution behavior:
SUID: When set, a program runs with the owner's permissions (e.g., root) rather than the executor's. It's denoted by an s in the user execute position (replacing x if executable, or capitalized S if not).
Analysis:
-rwxr-sr-x (myfile): User: rwx, Group: r-s (SGID), Others: r-x. The s is in the group execute position, indicating SGID, not SUID.
-rwsr-xr-x (myprogram): User: rws (SUID), Group: r-x, Others: r-x. The s in the user execute position confirms SUID; owned by root, it runs as root.
-rw-r--r-s (anotherfile): User: rw-, Group: r--, Others: r-s. The s is in the others execute position, but no x exists, making it irrelevant (and not SUID). Typically, s here would be a sticky bit on directories, not files.
Security Implications: SUID binaries (e.g., /usr/bin/passwd) are common targets for privilege escalation if misconfigured (e.g., writable by non-root users). CNSP likely emphasizes auditing SUID permissions with find / -perm -u=s.
Why other options are incorrect:
A . myfile: Has SGID (s in group), not SUID.
C . anotherfile: The s doesn't indicate SUID; it's a misapplied bit without execute permission.
D . All of the above: Only myprogram has SUID.
Real-World Context: Exploiting SUID binaries is a classic Linux attack vector (e.g., CVE-2016-1247 for Nginx).
NEW QUESTION # 37
What is the response from a closed TCP port which is behind a firewall?
Answer: C
NEW QUESTION # 38
Which SMB (Server Message Block) network protocol version introduced support for encrypting SMB traffic?
Answer: B
Explanation:
The SMB protocol, used for file and printer sharing, has evolved across versions, with significant security enhancements in later iterations.
Why C is correct: SMBv3, introduced with Windows 8 and Server 2012, added native support for encrypting SMB traffic. This feature uses AES-CCM encryption to protect data in transit, addressing vulnerabilities in earlier versions. CNSP notes SMBv3's encryption as a critical security improvement.
Why other options are incorrect:
A . SMBv1: Lacks encryption support and is considered insecure, often disabled due to vulnerabilities like WannaCry exploitation.
B . SMBv2: Introduces performance improvements but does not support encryption natively.
D . None of the above: Incorrect, as SMBv3 is the version that introduced encryption.
NEW QUESTION # 39
An 'EICAR' file can be used to?
Answer: A
Explanation:
The EICAR test file is a standardized tool in security testing, designed for a specific purpose.
Why A is correct: The EICAR file (a 68-byte string) triggers antivirus detection without harm, testing response capabilities. CNSP recommends it for AV validation.
Why B is incorrect: It has no role in testing encryption; it's solely for AV functionality.
NEW QUESTION # 40
What will be the subnet mask for 192.168.0.1/18?
Answer: B
Explanation:
An IP address with a /18 prefix (CIDR notation) indicates 18 network bits in the subnet mask, leaving 14 host bits (32 total bits - 18). For IPv4 (e.g., 192.168.0.1):
Binary Mask: First 18 bits are 1s, rest 0s.
1st octet: 11111111 (255)
2nd octet: 11111111 (255)
3rd octet: 11000000 (192)
4th octet: 00000000 (0)
Decimal: 255.255.192.0
Calculation:
Bits: /18 = 2
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