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What does DNS stand for?
a. Data Network Solution
b. Domain Name System
c. Digital Name Service
d. Device Naming Scheme
Answer: b. Domain Name Systemsanfoundry+1
What is the primary purpose of DNS?
a. To manage server hardware
b. To translate domain names into IP addresses
c. To encrypt network traffic
d. To assign MAC addresses
Answer: b. To translate domain names into IP addressesaskfilo+1
On the internet, what does a domain name represent?
a. Physical device location
b. Readable address for a computer or service
c. IP address of a printer
d. Security certificate
Answer: b. Readable address for a computer or servicesanfoundry+1
Which of the following best describes an IP address?
a. A user-friendly name
b. A unique identifier for a device on a network
c. A website’s page title
d. A data encryption key
Answer: b. A unique identifier for a device on a networksanfoundry+1
What does DNS enable users to do?
a. Hack network traffic
b. Access websites by typing human-friendly names
c. Encrypt emails
d. Upgrade firmware
Answer: b. Access websites by typing human-friendly namessanfoundry+1
Which protocol most commonly works with DNS for internet communication?
a. SMTP
b. HTTP
c. FTP
d. TCP/IP
Answer: d. TCP/IPsanfoundry+1
What is a DNS query?
a. A request to read email
b. A request sent to resolve a domain name to its IP address
c. A packet containing encrypted data
d. A server reboot command
Answer: b. A request sent to resolve a domain name to its IP addresssanfoundry+1
Which device usually performs DNS lookups for you at home?
a. Your personal computer
b. Your home router
c. Your ISP’s DNS server
d. Your antivirus software
Answer: c. Your ISP’s DNS serversanfoundry+1
What is the default port number for DNS?
a. 21
b. 25
c. 53
d. 443
Answer: c. 53sanfoundry+1
What type of DNS record maps a domain name to an IPv4 address?
a. MX record
b. A record
c. PTR record
d. CNAME record
Answer: b. A recordwayground+1
What does an MX record in DNS specify?
a. Mail Exchange server for a domain
b. Maximum file transfer size
c. Machine expiration date
d. Main external IP address
Answer: a. Mail Exchange server for a domainwayground+1
What is a CNAME record used for in DNS?
a. Mapping a domain to multiple IPs
b. Creating a canonical alias for another domain name
c. Providing encrypted DNS responses
d. Blocking malicious domains
Answer: b. Creating a canonical alias for another domain namewayground+1
What is the role of a PTR record?
a. Encrypt communication
b. Reverse lookup: maps IP addresses to domain names
c. Assigns primary DNS servers
d. Stores security keys
Answer: b. Reverse lookup: maps IP addresses to domain namessanfoundry
Which of the following can be considered the “phonebook” of the internet?
a. Firewall rules
b. Domain Name System (DNS)
c. VPN tunneling
d. Digital certificates
Answer: b. Domain Name System (DNS)sanfoundry
Which of these best describes a DNS server?
a. Stores email attachments
b. Translates domain names to IP addresses
c. Blocks malware downloads
d. Hosts websites
Answer: b. Translates domain names to IP addressessanfoundry+1
Which of the following describes a primary DNS server?
a. Backup server for DNS
b. Authoritative for a zone, manages updates
c. Provides wireless signal
d. Runs only at night
Answer: b. Authoritative for a zone, manages updatessanfoundry
What is a secondary DNS server?
a. Server that stores passwords
b. Stores a copy of zone data, serves as backup
c. Encrypts DNS traffic
d. Designs website layouts
Answer: b. Stores a copy of zone data, serves as backupsanfoundry
What is DNS caching?
a. Storing DNS queries for reuse to speed up resolution
b. Encrypting DNS data for security
c. Delaying DNS queries intentionally
d. Exploiting unsecured DNS servers
Answer: a. Storing DNS queries for reuse to speed up resolutionsanfoundry
What threat occurs when a DNS server is tricked into accepting false DNS records?
a. DDoS attack
b. DNS poisoning (cache poisoning)
c. Firewall bypass
d. VPN hijacking
Answer: b. DNS poisoning (cache poisoning)studocu+1
What can result from successful DNS poisoning?
a. Faster web browsing
b. Users are redirected to malicious sites
c. Enhanced privacy
d. Free internet access
Answer: b. Users are redirected to malicious sitesstudocu+1
Which secure extension has been developed to add authentication to DNS?
a. SSL
b. DNSSEC
c. HTTPS
d. TSL
Answer: b. DNSSECstudocu
How does DNSSEC improve DNS security?
a. By encrypting firewalls
b. By providing digital signatures to verify DNS data
c. By blocking all DNS traffic
d. By deleting invalid domains
Answer: b. By providing digital signatures to verify DNS datastudocu
Which attack intercepts and alters DNS requests between a user and DNS server?
a. Man-in-the-Middle (MITM)
b. DOS attack
c. WiFi jamming
d. Port scanning
Answer: a. Man-in-the-Middle (MITM)studocu
What feature of DNS can attackers exploit to redirect users without their knowledge?
a. DNS forwarding
b. DNS hijacking
c. DNS recursion
d. DNS repeaters
Answer: b. DNS hijackingsanfoundry+1
What is meant by DNS spoofing?
a. Securing DNS communications
b. Falsifying DNS data to redirect users
c. Compressing DNS packets
d. Speeding up the DNS protocol
Answer: b. Falsifying DNS data to redirect usersstudocu+1
If you want to access your favorite website and type its name in the browser, what is the first step your computer takes?
a. Contact the hosting provider
b. Performs a DNS lookup
c. Encrypts your request
d. Runs a malware scan
Answer: b. Performs a DNS lookupsanfoundry+1
Which of these is NOT a type of DNS record?
a. SOA
b. TXT
c. HTTP
d. SRV
Answer: c. HTTPwayground+1
What does the DNS root server do?
a. Assign IP addresses
b. Directs queries to the appropriate top-level domain server
c. Stores all DNS zone data
d. Blocks malicious queries
Answer: b. Directs queries to the appropriate top-level domain serversanfoundry
Which of the following is an example of a top-level domain (TLD)?
a. google.com
b. .org
c. www.example.com
d. user.home
Answer: b. .orgsanfoundry
In the domain name “mail.example.com”, “example” is the:
a. Top-level domain
b. Second-level domain
c. Root domain
d. Subdomain
Answer: b. Second-level domainsanfoundry
What does a DNS resolver do?
a. Encrypt website traffic
b. Resolves domain names to IP addresses
c. Blocks spam messages
d. Protects against DDoS
Answer: b. Resolves domain names to IP addressessanfoundry+1
What is forward DNS lookup?
a. Finding the domain name from an IP address
b. Locating an IP address from a domain name
c. Encrypting DNS requests
d. Slowing down DNS servers
Answer: b. Locating an IP address from a domain namesanfoundry
What is reverse DNS lookup?
a. Resolving a domain to an IP address
b. Resolving an IP address back to a domain name
c. Encrypting email traffic
d. Mapping MAC addresses
Answer: b. Resolving an IP address back to a domain namesanfoundry
Which of these issues might happen if DNS fails or is attacked?
a. Faster internet speeds
b. Inability to access websites by name
c. Better WiFi coverage
d. Direct access to root servers
Answer: b. Inability to access websites by namestudocu+1
Why do attackers target DNS?
a. For fun
b. It is a critical component, and controls access to web resources
c. To improve security
d. To change website content
Answer: b. It is a critical component, and controls access to web resourcesstudocu+1
Which of these is a security improvement for DNS?
a. Allowing any user to modify records
b. Implementing DNSSEC and monitoring DNS logs
c. Disabling all DNS servers
d. Removing zone files
Answer: b. Implementing DNSSEC and monitoring DNS logsstudocu
How can organizations detect potential DNS security incidents?
a. By ignoring DNS logs
b. By monitoring DNS logs for abnormal activity
c. By disabling DNS records
d. Allowing dynamic updates without restrictions
Answer: b. By monitoring DNS logs for abnormal activitystudocu
What does TTL mean in a DNS record?
a. Time To Live – how long a DNS record is cached
b. Transfer To Local – data migration type
c. Total Traffic Load
d. Target Top Level
Answer: a. Time To Live – how long a DNS record is cachedsanfoundry
Which record can be used to store arbitrary, human-readable information about a domain?
a. TXT
b. A
c. MX
d. CNAME
Answer: a. TXTsanfoundry
Why might attackers use DNS tunneling?
a. To speed up DNS resolution
b. To secretly transfer data using DNS queries
c. To cache DNS results longer
d. To block email messages
Answer: b. To secretly transfer data using DNS queriessanfoundry+1
Which of the following is NOT a real DNS threat?
a. DNS cache poisoning
b. DNS spoofing
c. DNS logging
d. DNS hijacking
Answer: c. DNS loggingsanfoundry+1
What term is used for a complete domain name, including all labels from root to host?
a. PQDN
b. FQDN
c. TLD
d. SLD
Answer: b. FQDN (Fully Qualified Domain Name)sanfoundry
What are Name Servers responsible for?
a. Backing up emails
b. Storing and serving DNS records for a domain
c. Assigning user passwords
d. Compressing web files
Answer: b. Storing and serving DNS records for a domainsanfoundry
What is a “zone” in DNS terminology?
a. A security scan
b. Part of the DNS namespace managed by a DNS server
c. Backup server for user files
d. A policy document
Answer: b. Part of the DNS namespace managed by a DNS serversanfoundry
Which kind of DNS query is responded to with the best answer known, but may refer the client elsewhere for more information?
a. Iterative query
b. Recursive query
c. Dynamic query
d. Encrypted query
Answer: a. Iterative querytestbook+1
What is a recursive DNS query?
a. Answer sent directly from the root server
b. DNS server returns a complete answer or an error
c. Only available to government servers
d. Ignores TLDs entirely
Answer: b. DNS server returns a complete answer or an errortestbook+1
Who maintains the DNS root servers?
a. Individual website owners
b. A group of organizations coordinated by ICANN
c. Local ISPs
d. Cybersecurity researchers only
Answer: b. A group of organizations coordinated by ICANNsanfoundry
What is the first level in the hierarchy for a DNS domain name?
a. TLD (Top-Level Domain)
b. Root
c. Subdomain
d. Second-Level Domain
Answer: b. Rootsanfoundry
What is Dynamic DNS (DDNS) used for?
a. Hack DNS servers
b. Automatically update DNS records when device IPs change
c. Encrypt DNS traffic
d. Slow down attackers
Answer: b. Automatically update DNS records when device IPs changesanfoundry
If an attacker controls a DNS server, what risk arises?
a. Faster internet speed
b. Redirecting user traffic to malicious sites
c. Guaranteed data privacy
d. Improved file sharing
Answer: b. Redirecting user traffic to malicious sitessanfoundry+1

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