20+ practice questions focused on Communication and Network Security — one of the most tested topics on the Certified Information Systems Security Professional CISSP exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Communication and Network Security PracticeDuring a security assessment, a penetration tester sends TCP SYN packets to various ports on a target server. Based on the responses, the tester determines which ports are open. This technique is commonly used at which OSI layer?
Explanation: The TCP SYN scan operates at Layer 4 (Transport) of the OSI model because it manipulates TCP segment headers, specifically the SYN flag, to probe port states. The tester sends SYN packets and interprets the response (SYN-ACK for open, RST for closed) to infer port availability, which is a transport-layer function defined by RFC 793.
An organization is deploying a wireless network with WPA3-Enterprise. Which THREE of the following are features or improvements of WPA3 compared to WPA2? (Select THREE.)
Explanation: Protected Management Frames (PMF) are mandatory in WPA3, whereas in WPA2 they were optional. PMF provides integrity and replay protection for management frames. WPA3 also introduces forward secrecy (preventing decryption of captured traffic even if the password is later compromised) and replaces WPA2-PSK with Simultaneous Authentication of Equals (SAE) for personal networks to resist offline dictionary attacks.
A security administrator is evaluating secure file transfer protocols. Which THREE of the following protocols provide encryption for data in transit? (Select THREE.)
Explanation: SFTP (SSH File Transfer Protocol), SCP (Secure Copy Protocol), and FTPS (FTP Secure) all provide encryption for data in transit. SFTP and SCP both run over SSH (typically TCP port 22), encrypting both credentials and data. FTPS uses SSL/TLS to encrypt the control and data channels. FTP and TFTP transmit data in plaintext and do not provide encryption.
A security engineer is evaluating VPN protocols for a remote access solution. The requirements are: strong encryption with perfect forward secrecy, support for mutual authentication, and no reliance on pre-shared keys that could be brute-forced. Which protocol best meets these requirements?
Explanation: WireGuard is the correct choice because it uses modern cryptographic primitives (Curve25519, ChaCha20, Poly1305, BLAKE2s) that inherently provide perfect forward secrecy via ephemeral Diffie-Hellman key exchanges, supports mutual authentication through public-key-based handshakes, and eliminates pre-shared keys as the sole authentication factor—though an optional PSK can be added for post-quantum resistance, it is not required and does not weaken security if omitted.
A security architect is designing a network segmentation strategy for a financial institution. Which TWO techniques are best suited for implementing micro-segmentation in a data center environment? (Select two.)
Explanation: Software-Defined Networking (SDN) and hypervisor-based firewalls are the primary technologies used to achieve micro-segmentation in modern virtualized data centers. SDN decouples the control plane from the data plane, allowing centralized, programmable, and dynamic policy enforcement at the individual workload level. Hypervisor-based firewalls (or distributed firewalls) run directly within the virtualization layer (hypervisor), enabling stateful inspection of east-west traffic between virtual machines on the same host or virtual network without requiring traffic to be hairpinned to physical firewalls. Traditional VLANs and physical firewalls are too coarse-grained and do not scale effectively for micro-segmentation.
+15 more Communication and Network Security questions available
Practice all Communication and Network Security questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Communication and Network Security. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Communication and Network Security questions on the CISSP frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Communication and Network Security is tested as part of the Certified Information Systems Security Professional CISSP blueprint. Practicing with targeted Communication and Network Security questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Communication and Network Security is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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