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NEW QUESTION # 21
Which is the correct command to change the MAC address for an Ethernet adapter in a Unix-based system?
Answer: D
Explanation:
In Unix-based systems (e.g., Linux), the ifconfig command is historically used to configure network interfaces, including changing the Media Access Control (MAC) address of an Ethernet adapter. The correct syntax to set a new MAC address for an interface like eth0 is ifconfig eth0 hw ether AA:BB:CC:DD:EE:FF, where hw specifies the hardware address type (ether for Ethernet), followed by the new MAC address in colon-separated hexadecimal format.
Why A is correct: The hw ether argument is the standard and correct syntax recognized by ifconfig to modify the MAC address. This command temporarily changes the MAC address until the system reboots or the interface is reset, assuming the user has sufficient privileges (e.g., root). CNSP documentation on network configuration and spoofing techniques validates this syntax for testing network security controls.
Why other options are incorrect:
B: hdw is not a valid argument; it's a typographical error and unrecognized by ifconfig.
C: hdwr is similarly invalid; no such shorthand exists in the command structure.
D: hwr is incorrect; the full keyword hw followed by ether is required for proper parsing.
NEW QUESTION # 22
Which SMB (Server Message Block) network protocol versions are vulnerable to the EternalBlue (MS17-010) Windows exploit?
Answer: C
Explanation:
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.
NEW QUESTION # 23
Which of the following techniques can be used to bypass network segmentation during infrastructure penetration testing?
Answer: C
Explanation:
Network segmentation isolates network zones for security, but certain techniques can circumvent these controls, a focus of CNSP penetration testing.
Why D is correct:
A: DNS tunneling encodes data in DNS queries, bypassing segmentation via legitimate DNS traffic.
B: VLAN hopping exploits switch misconfigurations (e.g., double tagging) to access other VLANs.
C: Covert channels use hidden communication paths (e.g., timing channels) to evade segmentation.
All are valid techniques per CNSP for testing segmentation controls.
Why other options are incomplete: A, B, or C alone exclude other viable methods, making D the comprehensive answer.
NEW QUESTION # 24
How would you establish a null session to a Windows host from a Windows command prompt?
Answer: C
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 hostnameipc$ "" /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 # 25
On a Microsoft Windows operating system, what does the following command do?
net localgroup Sales Sales_domain /add
Answer: B
Explanation:
The net localgroup command manages local group memberships on Windows systems, with syntax dictating its action.
Why B is correct: net localgroup Sales Sales_domain /add adds the domain group Sales_domain to the local group Sales, granting its members local group privileges. CNSP covers this for privilege escalation testing.
Why other options are incorrect:
A: Displaying users requires net localgroup Sales without /add.
C: Adding a user requires a username, not a group name like Sales_domain.
D: The reverse (local to domain) uses net group, not net localgroup.
NEW QUESTION # 26
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