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What is a DNS sinkhole in cybersecurity?
a. A tool that encrypts emails
b. A technology that updates domain names automatically
c. A DNS server that returns false IP addresses to block malicious domains
d. A method for improving website speed
Answer: c. A DNS server that returns false IP addresses to block malicious domainscatchpoint+2
The main function of a DNS sinkhole is to:
a. Encrypt web traffic
b. Redirect traffic from malicious domains to a safe IP address
c. Back up DNS records
d. Upgrade DNS servers automatically
Answer: b. Redirect traffic from malicious domains to a safe IP addressbluecatnetworks+1
Which type of IP address does a DNS sinkhole usually provide for a malicious domain?
a. A real server IP
b. A non-routable or controlled IP
c. An external public IP
d. A VPN IP address
Answer: b. A non-routable or controlled IPcybb0rg+1
DNS sinkholes are mainly used for:
a. Speeding up domain resolution
b. Blocking communication with harmful websites
c. Increasing cloud storage
d. Managing email servers
Answer: b. Blocking communication with harmful websiteshuntress+1
What is one common use case for a DNS sinkhole?
a. Automatically renew domain names
b. Block malware by preventing devices from reaching their command-and-control servers
c. Host public websites
d. Automate web design
Answer: b. Block malware by preventing devices from reaching their command-and-control serverscybb0rg+1
How does a DNS sinkhole help detect infected devices on a network?
a. By scanning for viruses
b. By monitoring which devices try to access blocked domains
c. By running antivirus software
d. By tracking website visits
Answer: b. By monitoring which devices try to access blocked domainsioriver+1
A DNS sinkhole is sometimes also called a:
a. Root server
b. Blackhole DNS
c. Firewall
d. Proxy server
Answer: b. Blackhole DNSwikipedia+1
Which layer of network communication does DNS sinkholing primarily operate on?
a. Transport
b. Application
c. Network
d. Data link
Answer: b. Applicationsocradar+1
What happens if a device requests a malicious domain that is on the sinkhole list?
a. It receives a valid IP and connects normally
b. The request is ignored entirely
c. It receives a false IP address and cannot reach the true destination
d. Its DNS server is automatically reset
Answer: c. It receives a false IP address and cannot reach the true destinationcatchpoint+1
By using a DNS sinkhole, organizations can:
a. Replace antivirus programs
b. Proactively block known threats before they cause harm
c. Prevent all network outages
d. Increase server speed
Answer: b. Proactively block known threats before they cause harmhuntress+1
DNS sinkholing is especially effective for stopping which type of cyber attack?
a. DDoS attacks
b. Command-and-control (C2) malware communication
c. Physical server theft
d. Wi-Fi sniffing
Answer: b. Command-and-control (C2) malware communicationioriver+1
Which of the following is a limitation of DNS sinkholing?
a. It cannot block any traffic
b. It may not alert admins about blocked attempts
c. It slows down internet speed significantly
d. It removes infected software automatically
Answer: b. It may not alert admins about blocked attemptssocradar+1
What kind of list is used by a DNS sinkhole to know which domains to block?
a. Allowed domains
b. Malicious domains blacklist
c. Recent visitors
d. Social media links
Answer: b. Malicious domains blacklistcatchpoint+1
DNS sinkholes are often implemented on which devices?
a. Only client PCs
b. DNS servers, firewalls, or dedicated appliances
c. Bluetooth devices
d. USB drives
Answer: b. DNS servers, firewalls, or dedicated applianceshuntress+1
What does a DNS sinkhole return when a blocked domain is requested?
a. “Domain not found”
b. A purposely chosen IP address
c. An error page
d. Server upgrade notice
Answer: b. A purposely chosen IP addressbluecatnetworks+1
Which of the following is NOT a typical purpose of DNS sinkholing?
a. Blocking ads
b. Blocking malware
c. Speeding up DNS
d. Detecting botnets
Answer: c. Speeding up DNSwikipedia+1
Why would an organization point a sinkhole response to a logging server?
a. To slow down attackers
b. To monitor infected devices trying to access malicious domains
c. To switch DNS providers
d. To encrypt data
Answer: b. To monitor infected devices trying to access malicious domainsioriver+1
A DNS sinkhole defends against which network threat?
a. Browser updates
b. Unauthorized IoT device connections
c. Communication with malicious domains
d. Printer configurations
Answer: c. Communication with malicious domainsbluecatnetworks+1
If a company uses only a local hosts file to block domains, it is implementing a very basic form of:
a. DNS sinkholing
b. Patch management
c. Dynamic routing
d. Hypervisor
Answer: a. DNS sinkholingwikipedia+1
What protocol does DNS usually use for sinkhole queries?
a. SMTP
b. UDP
c. FTP
d. HTTP
Answer: b. UDPsocradar
Which feature differentiates a DNS sinkhole from a firewall?
a. It filters traffic based on content, not domains
b. It works by manipulating DNS responses
c. It blocks only internal communication
d. It requires physical hardware changes
Answer: b. It works by manipulating DNS responseshuntress+1
How often should the blacklist used by a DNS sinkhole be updated?
a. Never
b. Once a year
c. Regularly, to include newly discovered threats
d. Only after a breach
Answer: c. Regularly, to include newly discovered threatscatchpoint+1
Which common cyber threat is a prime target for DNS sinkhole mitigation?
a. Keylogging
b. Ransomware command servers
c. Hardware overheating
d. SQL injection
Answer: b. Ransomware command serverscybb0rg+1
What kind of IP address will a “loopback” sinkhole typically use in response to a malicious domain?
a. 8.8.8.8
b. 127.0.0.1
c. 192.168.1.1
d. 255.255.255.0
Answer: b. 127.0.0.1catchpoint
Sinkhole logs can help cybersecurity teams by:
a. Reducing DNS latency
b. Identifying which devices may be infected
c. Generating SSL certificates
d. Lowering data center costs
Answer: b. Identifying which devices may be infectedioriver+1
Which statement best describes DNS sinkholing?
a. Redirects network traffic by modifying router tables
b. Blocks access to specific domains by returning controlled IPs
c. Automatically updates all software
d. Forces all users to use a VPN
Answer: b. Blocks access to specific domains by returning controlled IPshuntress+1
A company might use DNS sinkholing as part of:
a. Backup management
b. Network defense in depth
c. Physical access control
d. Server virtualization
Answer: b. Network defense in depthwikipedia+1
DNS sinkholes can be implemented as a:
a. Standalone service or integrated into other network devices
b. Hardware upgrade kit
c. Wireless access point
d. USB stick
Answer: a. Standalone service or integrated into other network devicescatchpoint+1
If a user keeps being redirected away from a domain, what could this indicate?
a. Browser cache is full
b. The user’s device is infected and is trying to contact malicious domains
c. Printer is out of ink
d. Time zone misconfiguration
Answer: b. The user’s device is infected and is trying to contact malicious domainsioriver+1
Which organization role is most likely to manage a DNS sinkhole?
a. Web designer
b. Cybersecurity administrator
c. HR consultant
d. Marketing manager
Answer: b. Cybersecurity administratorwikipedia+1
DNS sinkholing is MOST effective if:
a. Only a few domains are blocked
b. The sinkhole covers a comprehensive list of known malicious domains
c. Devices are not monitored
d. Network speed is low
Answer: b. The sinkhole covers a comprehensive list of known malicious domainscybb0rg+1
What is a key advantage of DNS sinkholing?
a. Complex setup
b. Proactive threat interception
c. Slow performance
d. Limited compatibility
Answer: b. Proactive threat interceptioncybb0rg+1
The technique of DNS sinkholing is commonly used alongside:
a. Email spam filters
b. Threat intelligence services
c. Printer management
d. ARP spoofing
Answer: b. Threat intelligence servicesioriver+1
What happens to traffic sent to a DNS sinkhole IP?
a. It is analyzed and sometimes logged
b. It increases in speed
c. It’s encrypted and sent to the internet
d. It’s automatically compressed
Answer: a. It is analyzed and sometimes loggedcatchpoint+1
DNS sinkholing helps reduce which risk in an organization?
a. Delayed software updates
b. Unauthorized access to known malicious domains
c. Overuse of bandwidth
d. Data redundancy
Answer: b. Unauthorized access to known malicious domainsbluecatnetworks+1
What is an example of a tool often used for network-wide DNS sinkholing?
a. Pi-hole
b. FTP server
c. Word processor
d. Web browser extension
Answer: a. Pi-holewikipedia+1
What does “blackholing” of DNS queries mean?
a. Query is sent to the real destination
b. Query is intentionally given a non-functional IP
c. Server reboots all devices
d. Website loads faster
Answer: b. Query is intentionally given a non-functional IPwikipedia+1
DNS sinkholing blocks botnets by:
a. Encrypting firmware
b. Interrupting the DNS communication between bots and their controllers
c. Upgrading memory
d. Erasing data logs
Answer: b. Interrupting the DNS communication between bots and their controllershuntress+1
DNS sinkhole effectiveness depends on:
a. Coloring of websites
b. Accuracy and currency of its blacklist
c. The number of printers
d. Video quality
Answer: b. Accuracy and currency of its blacklistcybb0rg+1
Why is DNS sinkholing considered a proactive security strategy?
a. Stops threats after infection
b. Blocks known threats before victim networks can connect
c. Fixes operating system bugs
d. Monitors emails only
Answer: b. Blocks known threats before victim networks can connectcybb0rg+1
Sinkholing at which DNS level blocks the most requests?
a. Individual PC
b. Local router
c. Higher (ISP or TLD) level
d. Mobile device
Answer: c. Higher (ISP or TLD) levelwikipedia
Which term is closely related to DNS sinkholing?
a. DNS amplification
b. Sinkhole server
c. Hotspot
d. DMZ
Answer: b. Sinkhole servercatchpoint+1
DNS sinkholing helps mitigate which type of advanced persistent threat (APT) behavior?
a. Watering hole attacks
b. Command-and-control check-ins
c. Bluetooth jamming
d. Data fragmentation
Answer: b. Command-and-control check-insioriver+1
What happens if a sinkhole IP is set to a monitoring server?
a. Traffic is logged for further security analysis
b. Website speed increases
c. Data is forwarded without control
d. Email is encrypted
Answer: a. Traffic is logged for further security analysisioriver+1
A DNS sinkhole works by:
a. Responding to a DNS query for a malicious domain with a safe IP address
b. Deleting DNS records
c. Sending emails to users
d. Resetting user passwords
Answer: a. Responding to a DNS query for a malicious domain with a safe IP addresshuntress+1
A DNS sinkhole list should be updated based on:
a. Device warranty
b. Threat intelligence feeds
c. Printer supply changes
d. Battery levels
Answer: b. Threat intelligence feedscatchpoint+1
Sinkholing cannot prevent:
a. Newly discovered domains not yet on blacklist
b. Access to known malicious domains
c. Malware communication with known servers
d. Phishing attempts to blacklisted domains
Answer: a. Newly discovered domains not yet on blacklistcatchpoint
DNS sinkholing provides value to organizations by:
a. Blocking traffic to harmful destinations while identifying threats
b. Reducing contrast on monitors
c. Managing payroll
d. Optimizing storage
Answer: a. Blocking traffic to harmful destinations while identifying threatshuntress+1
What is required to configure DNS sinkholing?
a. List of domains to block and a chosen sinkhole IP
b. HDMI cables
c. Backup battery
d. Password reset scripts
Answer: a. List of domains to block and a chosen sinkhole IPbluecatnetworks+1
The process of DNS sinkholing is best described as:
a. Redirection of malicious or unwanted DNS queries to a controlled or non-existent address
b. Encryption of DNS queries
c. Registration renewal automation
d. Video streaming enhancement
Answer: a. Redirection of malicious or unwanted DNS queries to a controlled or non-existent addresscybb0rg+1

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