CNSP Exam Dumps Pass with Updated 2025 Certified Exam Questions
CNSP Exam Questions - Real & Updated Questions PDF
The SecOps Group CNSP Exam Syllabus Topics:
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
| Topic 6 |
|
| Topic 7 |
|
| Topic 8 |
|
| Topic 9 |
|
| Topic 10 |
|
NEW QUESTION # 36
In the context of the SSH (Secure Shell) public-private key authentication mechanism, which key is uploaded to the server and which key is used by the end-user for authentication?
- A. The private key is uploaded to the server and the public key is used by the end user for authentication.
- B. The public key is uploaded to the server and the private key is used by the end user for authentication.
Answer: B
Explanation:
SSH (Secure Shell), per RFC 4251, uses asymmetric cryptography (e.g., RSA, ECDSA) for secure authentication:
Key Pair:
Public Key: Freely shareable, used to encrypt or verify.
Private Key: Secret, used to decrypt or sign.
Process:
User generates a key pair (e.g., ssh-keygen -t rsa -b 4096).
Public Key is uploaded to the server, appended to ~/.ssh/authorized_keys (e.g., via ssh-copy-id).
Private Key (e.g., ~/.ssh/id_rsa) stays on the user's machine.
Authentication: Client signs a challenge with the private key; server verifies it with the public key.
Technical Details:
Protocol: SSH-2 (RFC 4253) uses a Diffie-Hellman key exchange, then public-key auth.
Files: authorized_keys (server, 0644 perms), private key (client, 0600 perms).
Security: Private key exposure compromises all systems trusting the public key.
Security Implications: CNSP likely stresses key management (e.g., passphrases, rotation) and server-side authorized_keys hardening (e.g., PermitRootLogin no).
Why other options are incorrect:
B: Uploading the private key reverses the model, breaking security-anyone with the server's copy could authenticate as the user. Asymmetric crypto relies on the private key remaining secret.
Real-World Context: GitHub uses SSH public keys for repository access, with private keys on user devices.
NEW QUESTION # 37
Which of the following statements regarding Authorization and Authentication is true?
- A. Authentication includes the execution rules that determine what functionality and data the user can access. Authentication and Authorization are both the same thing.
- B. Authentication is the process where requests to access a particular resource are granted or denied. Authorization is providing and validating identity.
- C. Authorization is the process where requests to access a particular resource are granted or denied. Authentication is providing and validating the identity.
- D. Authentication controls which processes a person can use and which files they can access, read, or modify. Authentication and authorization typically do not operate together, thus making it impossible to determine who is accessing the information.
Answer: C
Explanation:
Authentication and Authorization (often abbreviated as AuthN and AuthZ) are foundational pillars of access control in network security:
Authentication (AuthN): Verifies "who you are" by validating credentials against a trusted source. Examples include passwords, MFA (multi-factor authentication), certificates, or biometrics. It ensures the entity (user, device) is legitimate, typically via protocols like Kerberos or LDAP.
Authorization (AuthZ): Determines "what you can do" after authentication, enforcing policies on resource access (e.g., read/write permissions, API calls). It relies on mechanisms like Access Control Lists (ACLs), Role-Based Access Control (RBAC), or Attribute-Based Access Control (ABAC).
Option A correctly separates these roles:
Authorization governs access decisions (e.g., "Can user X read file Y?").
Authentication establishes identity (e.g., "Is this user X?").
In practice, these processes are sequential: AuthN precedes AuthZ. For example, logging into a VPN authenticates your identity (e.g., via username/password), then authorizes your access to specific subnets based on your role. CNSP likely stresses this distinction for designing secure systems, as conflating them risks privilege escalation or identity spoofing vulnerabilities.
Why other options are incorrect:
B: Reverses the definitions-Authentication doesn't grant/deny access (that's AuthZ), and Authorization doesn't validate identity (that's AuthN). This mix-up could lead to flawed security models.
C: Falsely equates AuthN and AuthZ and attributes access rules to AuthN. They're distinct processes; treating them as identical undermines granular control (e.g., NIST SP 800-53 separates IA-2 for AuthN and AC-3 for AuthZ).
D: Misassigns access control to AuthN and claims they don't interoperate, which is false-they work together in every modern system (e.g., SSO with RBAC). This would render auditing impossible, contradicting security best practices.
Real-World Context: A web server (e.g., Apache) authenticates via HTTP Basic Auth, then authorizes via .htaccess rules-two separate steps.
NEW QUESTION # 38
What is the response from a closed TCP port which is not behind a firewall?
- A. A FIN and an ACK packet
- B. A SYN and an ACK packet
- C. A RST and an ACK packet
- D. ICMP message showing Port Unreachable
Answer: C
Explanation:
TCP uses a structured handshake, and its response to a connection attempt on a closed port follows a specific protocol when unobstructed by a firewall.
Why C is correct: A closed TCP port responds with a RST (Reset) and ACK (Acknowledgment) packet to terminate the connection attempt immediately. CNSP highlights this as a key scanning indicator.
Why other options are incorrect:
A: ICMP Port Unreachable is for UDP, not TCP.
B: FIN/ACK is for closing active connections, not rejecting new ones.
D: SYN/ACK indicates an open port during the TCP handshake.
NEW QUESTION # 39
Which command will perform a DNS zone transfer of the domain "victim.com" from the nameserver at 10.0.0.1?
- A. dig @10.0.0.1 victim.com axfr
- B. dig @10.0.0.1 victim.com arfxr
- C. dig @10.0.0.1 victim.com axrfr
- D. dig @10.0.0.1 victim.com afxr
Answer: A
Explanation:
A DNS zone transfer replicates an entire DNS zone (a collection of DNS records for a domain) from a primary nameserver to a secondary one, typically for redundancy or load balancing. The AXFR (Authoritative Full Zone Transfer) query type, defined in RFC 1035, facilitates this process. The dig (Domain Information Groper) tool, a staple in Linux/Unix environments, is used to query DNS servers. The correct syntax is:
dig @<nameserver> <domain> axfr
Here, dig @10.0.0.1 victim.com axfr instructs dig to request a zone transfer for "victim.com" from the nameserver at 10.0.0.1. The @ symbol specifies the target server, overriding the system's default resolver.
Technical Details:
The AXFR query is sent over TCP (port 53), not UDP, due to the potentially large size of zone data, which exceeds UDP's typical 512-byte limit (pre-EDNS0).
Successful execution requires the nameserver to permit zone transfers from the querying IP, often restricted to trusted secondaries via Access Control Lists (ACLs) for security. If restricted, the server responds with a "REFUSED" error.
Security Implications: Zone transfers expose all DNS records (e.g., A, MX, NS), making them a reconnaissance goldmine for attackers if misconfigured. CNSP likely emphasizes securing DNS servers against unauthorized AXFR requests, using tools like dig to test vulnerabilities.
Why other options are incorrect:
A . dig @10.0.0.1 victim.com axrfr: "axrfr" is a typographical error. The correct query type is "axfr." Executing this would result in a syntax error or an unrecognized query type response from dig.
B . dig @10.0.0.1 victim.com afxr: "afxr" is another typo, not a valid DNS query type per RFC 1035. dig would fail to interpret this, likely outputting an error like "unknown query type." C . dig @10.0.0.1 victim.com arfxr: "arfxr" is also invalid, a jumbled version of "axfr." It holds no meaning in DNS protocol standards and would fail similarly.
Real-World Context: Penetration testers use dig ... axfr to identify misconfigured DNS servers. For example, dig @ns1.example.com example.com axfr might reveal subdomains or internal IPs if not locked down.
NEW QUESTION # 40
The Management Information Base (MIB) is a collection of object groups that is managed by which service?
- A. NTP
- B. SMTP
- C. SNMP
- D. TACACS
Answer: C
Explanation:
The Management Information Base (MIB) is a structured database defining manageable objects (e.g., CPU usage, interface status) in a network device. It's part of the SNMP (Simple Network Management Protocol) framework, per RFC 1157, used for monitoring and managing network devices (e.g., routers, switches).
SNMP Mechanics:
MIB Structure: Hierarchical, with Object Identifiers (OIDs) like 1.3.6.1.2.1.1.1.0 (sysDescr).
Ports: UDP 161 (agent), 162 (traps).
Operation: Agents expose MIB data; managers (e.g., Nagios) query it via GET/SET commands.
MIB files (e.g., IF-MIB, HOST-RESOURCES-MIB) are vendor-specific or standardized, parsed by SNMP tools (e.g., snmpwalk). CNSP likely covers SNMP for network monitoring and securing it against enumeration (e.g., weak community strings like "public").
Why other options are incorrect:
A . SMTP (Simple Mail Transfer Protocol): Email delivery (TCP 25), unrelated to MIB or device management.
C . NTP (Network Time Protocol): Time synchronization (UDP 123), not MIB-related.
D . TACACS (Terminal Access Controller Access-Control System): Authentication/authorization (TCP 49), not MIB management.
Real-World Context: SNMP misconfiguration led to the 2018 Cisco switch exploits via exposed MIB data.
NEW QUESTION # 41
What will be the subnet mask for 192.168.0.1/18?
- A. 255.225.192.0
- B. 255.255.255.0
- C. 255.225.225.0
- D. 255.255.192.0
Answer: D
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 = 2^14 hosts (16,384), minus 2 (network/broadcast) = 16,382 usable.
Range: 192.168.0.0-192.168.63.255 (3rd octet: 0-63, as 192 = 11000000 covers 6 bits).
Technical Details:
Subnet masks align on octet boundaries or mid-octet (e.g., 192 = 2^7 + 2^6).
Contrast: /24 = 255.255.255.0 (256 hosts), /16 = 255.255.0.0 (65,536 hosts).
Security Implications: Larger subnets (e.g., /18) increase broadcast domains, risking amplification attacks. CNSP likely teaches subnetting for segmentation (e.g., VLANs).
Why other options are incorrect:
A . 255.255.255.0: /24 (8 host bits), not /18.
B . 255.225.225.0: Invalid mask (225 = 11100001, non-contiguous 1s).
D . 255.225.192.0: Invalid (225 breaks binary sequence).
Real-World Context: Subnetting 192.168.0.0/18 isolates departments in enterprise networks.
NEW QUESTION # 42
What is the response from a closed UDP port which is not behind a firewall?
- A. A RST packet
- B. None of the above
- C. ICMP message showing Destination Unreachable
- D. No response
Answer: C
Explanation:
UDP is a connectionless protocol, and its behavior when a packet reaches a port depends on whether the port is open or closed. Without a firewall altering the response, the standard protocol applies.
Why A is correct: When a UDP packet is sent to a closed port, the host typically responds with an ICMP Type 3 (Destination Unreachable), Code 3 (Port Unreachable) message, indicating no service is listening. CNSP notes this as a key indicator in port scanning.
Why other options are incorrect:
B: RST packets are TCP-specific, not used in UDP.
C: No response occurs for open UDP ports unless an application replies, not closed ports.
D: A is correct, so "none of the above" is invalid.
NEW QUESTION # 43
What user account is required to create a Golden Ticket in Active Directory?
- A. Service account
- B. Domain User account
- C. Local User account
- D. KRBTGT account
Answer: D
Explanation:
A Golden Ticket is a forged Kerberos Ticket-Granting Ticket (TGT) in Active Directory (AD), granting an attacker unrestricted access to domain resources by impersonating any user (e.g., with Domain Admin privileges). Kerberos, per RFC 4120, relies on the KRBTGT account-a built-in service account on every domain controller-to encrypt and sign TGTs. To forge a Golden Ticket, an attacker needs:
The KRBTGT password hash (NTLM or Kerberos key), typically extracted from a domain controller's memory using tools like Mimikatz.
Additional domain details (e.g., SID, domain name).
Process:
Compromise a domain controller (e.g., via privilege escalation).
Extract the KRBTGT hash (e.g., lsadump::dcsync /user:krbtgt).
Forge a TGT with arbitrary privileges using the hash (e.g., Mimikatz's kerberos::golden command).
The KRBTGT account itself isn't "used" to create the ticket; its hash is the key ingredient. Unlike legitimate TGTs issued by the KDC, a Golden Ticket bypasses authentication checks, persisting until the KRBTGT password is reset (a rare event in most environments). CNSP likely highlights this as a high-severity AD attack vector.
Why other options are incorrect:
A . Local User account: Local accounts are machine-specific, lack domain privileges, and can't access the KRBTGT hash stored on domain controllers.
B . Domain User account: A standard user has no inherent access to domain controller credentials or the KRBTGT hash without escalation.
C . Service account: While service accounts may have elevated privileges, they don't automatically provide the KRBTGT hash unless compromised to domain admin level-still insufficient without targeting KRBTGT specifically.
Real-World Context: The 2014 Sony Pictures hack leveraged Golden Tickets, emphasizing the need for KRBTGT hash rotation post-breach (a complex remediation step).
NEW QUESTION # 44
How would you establish a null session to a Windows host from a Windows command prompt?
- A. net use \hostname\c$ "" /u:""
- B. net use \hostname\ipc$ "" /u:""
- C. net use \hostname\ipc$ "" /u:NULL
- D. net use \hostname\c$ "" /u:NULL
Answer: B
Explanation:
A null session in Windows is an unauthenticated connection to certain administrative shares, historically used for system enumeration. The net use command connects to a share, and the IPC$ (Inter-Process Communication) share is the standard target for null sessions, allowing access without credentials when configured to permit it.
Why C is correct: The command net use \\hostname\ipc$ "" /u:"" specifies the IPC$ share and uses empty strings for the password (first "") and username (/u:""), establishing a null session. This syntax is correct for older Windows systems (e.g., XP or 2003) where null sessions were more permissive, a topic covered in CNSP for legacy system vulnerabilities.
Why other options are incorrect:
A: Targets the c$ share (not typically used for null sessions) and uses /u:NULL, which is invalid syntax; the username must be an empty string ("").
B: Targets c$ instead of ipc$, making it incorrect for null session establishment.
D: Uses ipc$ correctly but specifies /u:NULL, which is not the proper way to denote an empty username.
NEW QUESTION # 45
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
- A. All of the above
- B. myprogram
- C. anotherfile
- D. myfile
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 # 46
On a Microsoft Windows Operating System, what does the following command do?
net localgroup administrators
- A. Displays the local administrators group on the computer
- B. List domain admin users for the current domain
Answer: A
Explanation:
The net command in Windows is a legacy tool for managing users, groups, and network resources. The subcommand net localgroup <groupname> displays information about a specified local group on the machine where it's run. Specifically:
net localgroup administrators lists all members (users and groups) of the local Administrators group on the current computer.
The local Administrators group grants elevated privileges (e.g., installing software, modifying system files) on that machine only, not domain-wide.
Output Example:
Alias name administrators
Comment Administrators have complete and unrestricted access to the computer Members
------------------------------------------------------------------------------- Administrator Domain Admins The command completed successfully.
Technical Details:
Local groups are stored in the Security Accounts Manager (SAM) database (e.g., C:\Windows\System32\config\SAM).
This differs from domain groups (e.g., Domain Admins), managed via Active Directory.
Security Implications: Enumerating local admins is a reconnaissance step in penetration testing (e.g., to escalate privileges). CNSP likely covers this command for auditing and securing Windows systems.
Why other options are incorrect:
A . List domain admin users for the current domain: This requires net group "Domain Admins" /domain, which queries the domain controller, not the local SAM. net localgroup is strictly local.
Real-World Context: Attackers use this command post-compromise (e.g., via PsExec) to identify privilege escalation targets.
NEW QUESTION # 47
What kind of files are "Dotfiles" in a Linux-based architecture?
- A. Driver files
- B. Hidden files
- C. System files
- D. Library files
Answer: B
Explanation:
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.
NEW QUESTION # 48
The Management Information Base (MIB) is a collection of object groups that is managed by which service?
- A. NTP
- B. SMTP
- C. SNMP
- D. TACACS
Answer: C
Explanation:
The Management Information Base (MIB) is a structured database defining manageable objects (e.g., CPU usage, interface status) in a network device. It's part of the SNMP (Simple Network Management Protocol) framework, per RFC 1157, used for monitoring and managing network devices (e.g., routers, switches).
SNMP Mechanics:
MIB Structure: Hierarchical, with Object Identifiers (OIDs) like 1.3.6.1.2.1.1.1.0 (sysDescr).
Ports: UDP 161 (agent), 162 (traps).
Operation: Agents expose MIB data; managers (e.g., Nagios) query it via GET/SET commands.
MIB files (e.g., IF-MIB, HOST-RESOURCES-MIB) are vendor-specific or standardized, parsed by SNMP tools (e.g., snmpwalk). CNSP likely covers SNMP for network monitoring and securing it against enumeration (e.g., weak community strings like "public").
Why other options are incorrect:
A . SMTP (Simple Mail Transfer Protocol): Email delivery (TCP 25), unrelated to MIB or device management.
C . NTP (Network Time Protocol): Time synchronization (UDP 123), not MIB-related.
D . TACACS (Terminal Access Controller Access-Control System): Authentication/authorization (TCP 49), not MIB management.
Real-World Context: SNMP misconfiguration led to the 2018 Cisco switch exploits via exposed MIB data.
NEW QUESTION # 49
In the context of a Unix-based system, where does a daemon process execute in the memory?
- A. Kernel space
- B. User space
Answer: B
Explanation:
In Unix-based systems, memory is divided into two primary regions: kernel space and user space, each serving distinct purposes for process execution and system stability.
Why B is correct: Daemon processes are background services (e.g., sshd, cron) that run with elevated privileges but operate in user space. User space is the memory area allocated for user applications and processes, isolated from kernel space to prevent direct hardware access or system crashes. CNSP highlights that daemons run in user space to maintain system integrity, interacting with the kernel via system calls.
Why other option is incorrect:
A . Kernel space: Kernel space is reserved for the operating system kernel and device drivers, which have unrestricted access to hardware. Running daemons in kernel space would pose significant security and stability risks, and it is not the standard practice in Unix systems.
NEW QUESTION # 50
Which of the following is true for SNMP?
A) The default community string for read-only access is "public."
B) The default community string for read/write access is "private."
- A. Only A
- B. Both A and B
- C. None of the above
- D. Only B
Answer: B
Explanation:
SNMP community strings authenticate access, with defaults posing security risks if unchanged.
Why C is correct:
A: "public" is the standard read-only default, per SNMP specs and CNSP.
B: "private" is the standard read-write default, also per SNMP and CNSP.
Both are true, making C the answer.
Why other options are incorrect:
1, 2: Exclude one true statement each.
4: Both statements are true, so "none" is wrong.
NEW QUESTION # 51
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. myprogram
- B. All of the above
- C. anotherfile
- D. myfile
Answer: D
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 # 52
What is the response from an open TCP port which is not behind a firewall?
- A. A SYN packet
- B. A RST and an ACK packet
- C. A SYN and an ACK packet
- D. A FIN and an ACK packet
Answer: C
Explanation:
TCP's three-way handshake, per RFC 793, establishes a connection:
Client → Server: SYN (Synchronize) packet (e.g., port 80).
Server → Client: SYN-ACK (Synchronize-Acknowledge) packet if the port is open and listening.
Client → Server: ACK (Acknowledge) completes the connection.
Scenario: An open TCP port (e.g., 80 for HTTP) with no firewall. When a client sends a SYN to an open port (e.g., via telnet 192.168.1.1 80), the server responds with a SYN-ACK packet, indicating willingness to connect. No firewall means no filtering alters this standard response.
Packet Details:
SYN-ACK: Sets SYN and ACK flags in the TCP header, with a sequence number and acknowledgment number.
Example: Client SYN (Seq=100), Server SYN-ACK (Seq=200, Ack=101).
Security Implications: Open ports responding with SYN-ACK are easily detected (e.g., Nmap "open" state), inviting exploits if unneeded (e.g., Telnet on 23). CNSP likely stresses port minimization and monitoring.
Why other options are incorrect:
A . A FIN and an ACK packet: FIN-ACK closes an established connection, not a response to a new SYN.
B . A SYN packet: SYN initiates a connection from the client, not a server response.
D . A RST and an ACK packet: RST-ACK rejects a connection (e.g., closed port), not an open one.
Real-World Context: SYN-ACK from SSH (22/TCP) confirms a server's presence during reconnaissance.
NEW QUESTION # 53
......
Pass Guaranteed Quiz 2025 Realistic Verified Free The SecOps Group: https://actualtests.testinsides.top/CNSP-dumps-review.html