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The SecOps Group Certified Network Security Practitioner Sample Questions (Q41-Q46):

NEW QUESTION # 41
Which of the following files has the SGID permission set?
-rwxr-sr-x 1 root root 4096 Jan 1 08:00 myfile
-rwsr-xr-x 1 root root 4096 Jan 1 00:08 myprogram
-rw-r--r-s 1 root root 4896 Jan 1 00:00 anotherfile

A. anotherfile
B. myfile
C. All of the above
D. myprogram

Answer: B

Explanation:
In Linux, the SGID (Set Group ID) bit alters execution or directory behavior:
On executables: Runs with the group owner's permissions (e.g., s in group execute position).
On directories: New files inherit the directory's group ownership.
Notation: s in group execute field (e.g., -rwxr-sr-x), or S if no execute (e.g., -rwxr-Sr-x).
Analysis:
-rwxr-sr-x (myfile): User: rwx, Group: r-s (SGID), Others: r-x. The s in group execute confirms SGID.
-rwsr-xr-x (myprogram): User: rws (SUID), Group: r-x, Others: r-x. The s is in user execute, not group-no SGID.
-rw-r--r-s (anotherfile): User: rw-, Group: r--, Others: r-s. The s is in others execute, but no x exists, rendering it meaningless (not SGID; could be a typo or sticky bit misapplied).
Security Implications: SGID executables (e.g., /usr/bin/wall) or directories (e.g., /var/local) manage group access. Misuse risks privilege escalation. CNSP likely teaches auditing with find / -perm -g=s.
Why other options are incorrect:
B: SUID, not SGID.
C: No valid SGID; s in others is irrelevant without execute.
D: Only A has SGID.
Real-World Context: SGID on /var/mail ensures mail files inherit the mail group.

NEW QUESTION # 42
In a Linux-based architecture, what does the /mnt directory contain?

A. System files which represent the current state of the kernel
B. Loadable driver modules needed to boot the system
C. System configuration files and initialization scripts
D. Temporary-mounted filesystems

Answer: D

Explanation:
The Linux Filesystem Hierarchy Standard (FHS), per FHS 3.0, defines directory purposes:
/mnt: Designated for temporarily mounted filesystems, typically by system administrators.
Use: Mount points for removable media (e.g., USB drives: mount /dev/sdb1 /mnt/usb) or network shares (e.g., NFS).
Nature: Transient, user-managed, not persistent across reboots (unlike /etc/fstab mounts).
Contrast:
/media: Auto-mounts removable devices (e.g., by desktop environments like GNOME).
/mnt vs. /media: /mnt is manual, /media is system-driven.
Technical Details:
Empty by default; subdirectories (e.g., /mnt/usb) are created as needed.
Permissions: Typically root-owned (0755), requiring sudo for mounts.
Security Implications: Misconfigured /mnt mounts (e.g., world-writable) risk unauthorized access. CNSP likely covers mount security (e.g., nosuid option).
Why other options are incorrect:
B . System config/init scripts: Found in /etc (e.g., /etc/passwd, /etc/init.d).
C . Driver modules: Located in /lib/modules/<kernel-version>.
D . Kernel state: Resides in /proc (e.g., /proc/cpuinfo).
Real-World Context: Admins mount ISOs at /mnt during server provisioning (e.g., mount -o loop image.iso /mnt).

NEW QUESTION # 43
WannaCry, an attack, spread throughout the world in May 2017 using machines running on outdated Microsoft operating systems. What is WannaCry?

A. Ransomware
B. Malware

Answer: A

Explanation:
WannaCry is a ransomware attack that erupted in May 2017, infecting over 200,000 systems across 150 countries. It exploited the EternalBlue vulnerability (MS17-010) in Microsoft Windows SMBv1, targeting unpatched systems (e.g., Windows XP, Server 2003). Developed by the NSA and leaked by the Shadow Brokers, EternalBlue allowed remote code execution.
Ransomware Mechanics:
Encryption: WannaCry used RSA-2048 and AES-128 to encrypt files, appending extensions like .wcry.
Ransom Demand: Displayed a message demanding $300-$600 in Bitcoin, leveraging a hardcoded wallet.
Worm Propagation: Self-replicated via SMB, scanning internal and external networks, unlike typical ransomware requiring user interaction (e.g., phishing).
Malware Context: While WannaCry is malware (malicious software), "ransomware" is the precise subcategory, distinguishing it from viruses, trojans, or spyware. Malware is a broad term encompassing any harmful code; ransomware specifically encrypts data for extortion. CNSP likely classifies WannaCry as ransomware to focus on its payload and mitigation (e.g., patching, backups).
Why other options are incorrect:
B . Malware: Correct but overly generic. WannaCry's defining trait is ransomware behavior, not just maliciousness. Specificity matters in security taxonomy for threat response (e.g., NIST IR 8019).
Real-World Context: WannaCry crippled NHS hospitals, highlighting patch management's criticality. A kill switch (a domain sinkhole) halted it, but variants persist.

NEW QUESTION # 44
Which Kerberos ticket is required to generate a Silver Ticket?

A. There is no specific ticket required for generating a Silver Ticket
B. Ticket-Granting Ticket
C. Session Ticket
D. Service Account Ticket

Answer: D

Explanation:
A Silver Ticket is a forged Kerberos Service Ticket (TGS - Ticket Granting Service) in Active Directory, granting access to a specific service (e.g., MSSQL, CIFS) without KDC interaction. Unlike a Golden Ticket (TGT forgery), it requires:
Service Account's NTLM Hash: The target service's account (e.g., MSSQLSvc) hash, not a ticket.
Forgery: Tools like Mimikatz craft the TGS (e.g., kerberos::golden /service:<spn> /user:<user> /ntlm:<hash>).
Kerberos Flow (RFC 4120):
TGT (Ticket-Granting Ticket): Obtained via AS (Authentication Service) with user creds.
TGS: Requested from TGS (Ticket Granting Service) using TGT for service access.
Silver Ticket Process:
No TGT needed; the attacker mimics the TGS step using the service account's stolen hash (e.g., from a compromised host).
C . Service Account Ticket: Misnomer-it's the hash of the service account (e.g., MSSQLSvc) that enables forgery, not a pre-existing ticket. CNSP's phrasing likely tests this nuance.
Security Implications: Silver Tickets are stealthier than Golden Tickets (service-specific, shorter-lived). CNSP likely stresses hash protection (e.g., LAPS) and Kerberos monitoring.
Why other options are incorrect:
A . Session Ticket: Not a Kerberos term; confuses session keys.
B . TGT: Used for Golden Tickets, not Silver.
D: Incorrect; the service account's hash (implied by "ticket") is essential.
Real-World Context: Silver Tickets exploited in APT29 attacks (2020 SolarWinds) for lateral movement.

NEW QUESTION # 45
How many octets are there in an IPv6 address?

A. 0
B. 1
C. 2
D. 3

Answer: C

Explanation:
An IPv6 address, defined in RFC 4291, is a 128-bit address designed to replace IPv4's 32-bit scheme, vastly expanding address space (2