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Module 8 Final Quiz: Network Security Fundamentals MCQs
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1
What three security principles compose the CIA Triad?
A.
Centralization, Isolation, Authentication
B.
Confidentiality, Integrity, Availability
C.
Cryptography, Inspection, Access
D.
Compatibility, Identification, Authorization
Explanation & Key
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2
What is the primary operational trade-off of Asymmetric Encryption compared to Symmetric Encryption?
A.
Asymmetric is less secure than symmetric
B.
Asymmetric solves the key-distribution problem using public/private key pairs, but is computationally ~1000x slower than symmetric encryption
C.
Asymmetric encryption cannot be decrypted
D.
Asymmetric requires physical paper keys
Explanation & Key
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3
How do modern hybrid cryptographic protocols like TLS/HTTPS combine symmetric and asymmetric encryption?
A.
They use symmetric encryption on weekdays and asymmetric on weekends
B.
They use Asymmetric encryption to authenticate the server and securely exchange a temporary session key, then switch to fast Symmetric encryption for bulk data transfer
C.
They encrypt the header symmetrically and payload asymmetrically
D.
They only use symmetric encryption
Explanation & Key
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4
What is a Digital Signature, and what properties does it guarantee?
A.
A handwritten signature scanned into a computer
B.
A message digest encrypted with the sender's PRIVATE key; guarantees Authentication, Non-Repudiation, and Integrity
C.
A password typed into a website form
D.
A watermark placed on a PDF document
Explanation & Key
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5
What is a Stateful Packet Inspection (SPI) Firewall?
A.
A firewall that only inspects IP headers without remembering anything
B.
A firewall that tracks the state and context of active network connections, allowing return packets only if they belong to a recognized, valid existing session
C.
A physical wall built around a server room
D.
A firewall that blocks all traffic unconditionally
Explanation & Key
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6
What is a Virtual Private Network (VPN)?
A.
A private cable laid under the ocean by a single user
B.
An encrypted network tunnel established over an untrusted public network (like the Internet), extending a private network securely to remote clients
C.
A program that blocks banner ads
D.
A computer that does not have an IP address
Explanation & Key
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7
What is a Distributed Denial of Service (DDoS) attack designed to compromise in the CIA triad?
A.
Confidentiality
B.
Integrity
C.
Availability
D.
Authentication
Explanation & Key
Correct Answer:
8
Which cryptographic algorithm is a widely adopted standard for symmetric block cipher encryption?
A.
RSA
B.
AES (Advanced Encryption Standard - 128/256 bits)
C.
Diffie-Hellman
D.
MD5
Explanation & Key
Correct Answer:
9
What is the difference between a Packet-Filtering Firewall and an Application-Level Gateway (Proxy)?
A.
Packet-filtering is slower than proxy
B.
Packet-filtering inspects packets at L3/L4 (IP addresses and ports) without examining payload; Application proxies inspect the complete application data content (L7)
C.
Application proxies cannot block viruses
D.
Packet-filtering firewalls decrypt SSL traffic
Explanation & Key
Correct Answer:
10
What mathematical property makes RSA asymmetric encryption secure?
A.
The speed of calculating floating point square roots
B.
The computational difficulty of factoring the product of two very large prime numbers (Prime Factorization Problem)
C.
The inability of computers to perform division
D.
The random nature of quantum mechanics
Explanation & Key
Correct Answer:
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