SSL/TLS protocols secure network communication, but older versions have vulnerabilities:
SSLv2 (1995):Weak ciphers, no handshake integrity (e.g., MITM via DROWN attack, CVE-2016-0800). Deprecated by RFC 6176 (2011).
SSLv3 (1996):Vulnerable to POODLE (CVE-2014-3566), weak block ciphers (e.g., RC4). Deprecated by RFC 7568 (2015).
TLSv1.0 (1999, RFC 2246):Inherits SSLv3 flaws (e.g., BEAST, CVE-2011-3389), weak CBC ciphers. Deprecated by PCI DSS (2018) and RFC 8996 (2021).
TLSv1.1 (2006, RFC 4346):Improved over 1.0 but lacks modern cipher suites (e.g., AEAD). Deprecated with 1.0 by RFC 8996.
TLSv1.2 (2008, RFC 5246):Secure with strong ciphers (e.g., AES-GCM), widely used today.
TLSv1.3 (2018, RFC 8446):Latest, removes legacy weaknesses, mandatory forward secrecy.
Answer:C (A and B)—SSLv2, SSLv3, TLSv1.0, and TLSv1.1 are unsafe due to exploitable flaws. TLSv1.2 and 1.3 remain secure. CNSP likely aligns with IETF/PCI standards, mandating modern versions.
Why other options are incorrect:
A:Correct but incomplete without B.
B:Correct but incomplete without A.
D:Incorrectly includes TLSv1.2 and 1.3, which are secure and recommended.
Real-World Context:POODLE forced mass SSLv3 disablement in 2014; TLS 1.0/1.1 deprecation hit legacy systems in 2021.References:CNSP Official Documentation (Cryptographic Protocols); RFC 8996 (TLS Deprecation).
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