Cyber Security Network Security 3 — Questions and Answers
Question 1: What is the purpose of NAC (Network Access Control)?
- Translate private IPs to public IPs
- Enforce security policies before granting network access (Correct answer)
- Monitor DNS queries
- Encrypt inter-VLAN routing
Correct answer: Enforce security policies before granting network access
NAC evaluates endpoint compliance with security policies before granting access to the network.
Question 2: Which DNS attack involves redirecting domain queries to malicious IP addresses by corrupting the DNS cache?
- DNS tunneling
- DNS cache poisoning (Correct answer)
- DNS amplification
- DNS rebinding
Correct answer: DNS cache poisoning
DNS cache poisoning injects malicious records into a DNS resolver's cache, redirecting users to attacker-controlled servers.
Question 3: What is the primary difference between a hub and a switch in network security?
- A hub encrypts data; a switch does not
- A switch sends traffic only to the intended recipient; a hub broadcasts to all ports (Correct answer)
- A hub supports VLANs; a switch does not
- A switch uses wireless; a hub uses wired connections
Correct answer: A switch sends traffic only to the intended recipient; a hub broadcasts to all ports
Switches use MAC address tables to send frames only to the correct port, reducing unnecessary traffic exposure.
Question 4: What does a botnet primarily enable attackers to do?
- Decrypt HTTPS traffic
- Conduct distributed attacks using compromised machines (Correct answer)
- Bypass multi-factor authentication
- Exfiltrate data via DNS
Correct answer: Conduct distributed attacks using compromised machines
A botnet is a network of compromised devices controlled remotely, often used for DDoS attacks or spam campaigns.
Question 5: Which tool is commonly used for packet capture and network traffic analysis?
- Nessus
- Wireshark (Correct answer)
- Metasploit
- Burp Suite
Correct answer: Wireshark
Wireshark is a widely used open-source tool for capturing and analyzing network packets.
Question 6: What is the role of a proxy server in network security?
- Assign IP addresses to clients
- Act as an intermediary to filter, log, and control traffic (Correct answer)
- Provide wireless access to endpoints
- Manage digital certificates
Correct answer: Act as an intermediary to filter, log, and control traffic
A proxy server sits between clients and the internet to filter content, enforce policies, and log access.
Cyber Security Network Security 3
What is the purpose of NAC (Network Access Control)?