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Which of the following services use TCP protocol?
TCP (Transmission Control Protocol) ensures reliable, ordered data delivery via a connection-oriented handshake, contrasting with UDP's lightweight, connectionless approach. Analyzing each service:
C . HTTP (Hypertext Transfer Protocol): Uses TCP (port 80) for web traffic. TCP's reliability ensures HTML, images, etc., arrive intact. HTTPS (TCP 443) extends this with TLS. RFC 2616 mandates TCP.
A . SNMP (Simple Network Management Protocol): Defaults to UDP (port 161) for monitoring devices. UDP's speed suits its lightweight queries, though TCP variants exist (rarely used).
B . NTP (Network Time Protocol): Uses UDP (port 123) per RFC 5905. UDP minimizes latency for time sync, tolerating occasional packet loss.
D . IKE (Internet Key Exchange): Part of IPsec, uses UDP (port 500) per RFC 7296. UDP suits its negotiation phase; TCP isn't standard.
Security Implications: TCP services like HTTP are more prone to state-based attacks (e.g., SYN floods) than UDP counterparts. CNSP likely contrasts TCP vs. UDP in protocol analysis.
Why other options are incorrect:
A, B, D: All default to UDP for efficiency, not TCP's reliability.
Real-World Context: Firewalls prioritize TCP 80/443 rules for HTTP/HTTPS, while UDP 123 is opened for NTP servers.
Where are the password hashes stored in a Microsoft Windows 64-bit system?
Windows stores password hashes in the SAM (Security Account Manager) file, with a consistent location across 32-bit and 64-bit systems.
Why B is correct: The SAM file resides at C:\Windows\System32\config\SAM, locked during system operation for security. CNSP notes this for credential extraction risks.
Why other options are incorrect:
A: System64 does not exist; System32 is used even on 64-bit systems.
C: C:\System64 is invalid; the path starts with Windows.
D: config\System32 reverses the correct directory structure.
Which of the following algorithms could be used to negotiate a shared encryption key?
Negotiating a shared encryption key involves a process where two parties agree on a secret key over an insecure channel without directly transmitting it. This is distinct from encryption or hashing algorithms, which serve different purposes.
Why C is correct: The Diffie-Hellman (DH) algorithm is a key exchange protocol that enables two parties to establish a shared secret key using mathematical operations (e.g., modular exponentiation). It's widely used in protocols like TLS and IPsec, as noted in CNSP for secure key negotiation.
Why other options are incorrect:
A: Triple-DES is a symmetric encryption algorithm for data encryption, not key negotiation.
B: SHA1 is a hash function for integrity, not key exchange.
D: AES is a symmetric encryption algorithm, not a key exchange mechanism.
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."
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.
If a hash begins with $2a$, what hashing algorithm has been used?
The prefix $2a$ identifies the bcrypt hashing algorithm, which is based on the Blowfish symmetric encryption cipher (developed by Bruce Schneier). Bcrypt is purpose-built for password hashing, incorporating:
Salt: A random string (e.g., 22 Base64 characters) to thwart rainbow table attacks.
Work Factor: A cost parameter (e.g., $2a$10$ means 2^10 iterations), making it computationally expensive to brute-force.
Format: $2a$[cost]$[salt][hash]
Example: $2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy
$2a$: Bcrypt variant (original is $2$; $2a$ fixes a minor bug).
$10$: 1024 iterations.
Next 22 characters: Salt.
Remaining: Hashed password.
Used in /etc/shadow on Linux, bcrypt's adaptive nature ensures it remains secure as hardware improves. CNSP likely includes it in cryptography modules for its strength over older algorithms like MD5.
Why other options are incorrect:
B . SHA256: Part of the SHA-2 family, outputs a 64-character hexadecimal string (e.g., e3b0c442...), no $ prefix. It's faster, less suited for passwords.
C . MD5: Produces a 32-character hex string (e.g., d41d8cd9...), no prefix. It's cryptographically broken (collisions found).
D . SHA512: SHA-2 variant, 128-character hex (e.g., cf83e135...), no $ prefix, not salted by default.
Real-World Context: Bcrypt protects SSH keys and web app passwords (e.g., in PHP's password_hash()).
