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Which protocol does DNS use for cacheable client queries?
a. TCP
b. UDP
c. FTP
d. ICMP
Answer: b. UDPtestbook+1
What is the main benefit of DNS caching?
a. Data redundancy
b. Faster DNS resolution
c. Enhanced encryption
d. Increased packet size
Answer: b. Faster DNS resolutionakamai+1
Where is DNS cache commonly stored on a client system?
a. Application Layer
b. Network Switch
c. Local operating system
d. VPN server
Answer: c. Local operating systemscribd+1
What information does a DNS cache hold?
a. HTTP cookies
b. DNS query results
c. Antivirus signatures
d. System logs
Answer: b. DNS query resultsfinalroundai+1
How does DNS caching help reduce network traffic?
a. By compressing packets
b. By avoiding repeat DNS queries
c. By updating firmware
d. By encrypting traffic
Answer: b. By avoiding repeat DNS queriesprinceton+1
DNS cache entries expire based on which setting?
a. CRC
b. TTL
c. MD5
d. Ping interval
Answer: b. TTLbrainscape+1
What is the default behavior if a DNS cache entry’s TTL has expired?
a. The cached data is retained
b. A new DNS query is made
c. The entry converts to IPv6
d. The OS restarts
Answer: b. A new DNS query is madebrainscape+1
What type of DNS server can cache responses but is not authoritative?
a. Primary
b. Recursive
c. Authoritative
d. TLD
Answer: b. Recursivetheknowledgeacademy+1
How does DNS caching affect DNS server load?
a. Increases load
b. Reduces load
c. No effect
d. Spreads load evenly
Answer: b. Reduces loadprinceton+1
Which DNS record’s value is most likely to be cached?
a. A
b. MX
c. CNAME
d. All of the above
Answer: d. All of the abovegeeksforgeeks+1
What component first checks its own DNS cache before sending a query?
a. DNS resolver
b. Web browser
c. DHCP server
d. Firewall
Answer: a. DNS resolverakamai+1
What is a cache hit in DNS?
a. Replacement of old entries
b. Retrieving data from cache
c. Failed resolution
d. Blocking an IP
Answer: b. Retrieving data from cacheprinceton+1
What happens if a DNS cache contains a stale record?
a. Fresh query is made
b. Browser ignores DNS
c. Data corruption occurs
d. Firewall is disabled
Answer: a. Fresh query is madeakamai+1
Which type of DNS lookup benefits most from caching?
a. Reverse lookup
b. Forward lookup
c. Serial lookup
d. Recursive lookup
Answer: b. Forward lookupfinalroundai+1
What action typically clears a local DNS cache on Windows?
a. ipconfig /clear
b. ipconfig /flushdns
c. ping localhost
d. arp -d
Answer: b. ipconfig /flushdnsexamtopics+1
Which is a possible consequence of DNS cache poisoning?
a. Faster resolution
b. Redirect to malicious sites
c. Improved authentication
d. Decreased bandwidth
Answer: b. Redirect to malicious sitessanfoundry+1
On which devices can DNS caching occur?
a. Routers
b. End-user computers
c. ISP DNS servers
d. All of the above
Answer: d. All of the abovefinalroundai+1
What is a negative cache in DNS?
a. Cache with only A records
b. Cache of failed DNS queries
c. Unencrypted cache
d. Dynamic cache update
Answer: b. Cache of failed DNS queriesprinceton+1
What mechanism does DNS use to update cache after TTL expiry?
a. Automatic retry
b. Manual entry
c. New DNS resolution
d. Random number generation
Answer: c. New DNS resolutionbrainscape+1
Which DNS component provides cached answers for repeat queries?
a. Authoritative server
b. Forwarding server
c. Recursive resolver
d. Mail server
Answer: c. Recursive resolvertheknowledgeacademy+1
What impact does reducing the TTL value have on DNS caching?
a. Longer cache retention
b. More frequent updates
c. Larger database size
d. Less network congestion
Answer: b. More frequent updatesakamai+1
Which DNS record is NOT typically cached?
a. A
b. SOA
c. CNAME
d. TXT
Answer: b. SOAstudocu+1
How does caching improve user experience?
a. Delays webpage loading
b. Ensures faster site access
c. Reduces available memory
d. Increases CPU usage
Answer: b. Ensures faster site accessfinalroundai+1
Which layer in the DNS query chain benefits most from caching?
a. Network
b. Transport
c. Application
d. Presentation
Answer: c. Applicationscribd+1
What command checks the DNS cache on macOS?
a. dscacheutil -cachedump
b. nslookup localhost
c. dig -cache
d. arp -a
Answer: a. dscacheutil -cachedumpexamtopics+1
What happens if DNS cache is disabled?
a. Increased query time
b. No change
c. Reduced traffic
d. Malfunctioning hardware
Answer: a. Increased query timeprinceton+1
Which attack targets DNS cache?
a. MITM
b. Cache poisoning
c. SYN flood
d. Dumpster diving
Answer: b. Cache poisoningsanfoundry+1
Where does a browser check first for cached DNS entries?
a. Router
b. Its own browser cache
c. ISP cache
d. DHCP server
Answer: b. Its own browser cachescribd+1
TTL stands for
a. Time To Locate
b. Total Transfer Log
c. Time To Live
d. Transfer To List
Answer: c. Time To Livebrainscape+1
What effect does a very long TTL have?
a. Fast updates
b. Stale cached records
c. Immediate refresh
d. Frequent queries
Answer: b. Stale cached recordsakamai+1
Which setting controls the time cache entries are retained?
a. TLD
b. TTL
c. TCP
d. ARP
Answer: b. TTLbrainscape+1
What is the primary security risk of DNS caching?
a. Traffic congestion
b. Cache poisoning
c. Packet loss
d. Increased latency
Answer: b. Cache poisoningsanfoundry+1
Which protocol helps DNSSEC validate cached responses?
a. UDP
b. TCP
c. DNSSEC
d. HTTP
Answer: c. DNSSECsanfoundry+1
What can be stored in DNS cache?
a. A records
b. CNAME records
c. AAAA records
d. All of the above
Answer: d. All of the abovegeeksforgeeks+1
Which DNS server holds a cache but is not considered authoritative?
a. Recursive resolver
b. TLD server
c. Primary server
d. Secondary server
Answer: a. Recursive resolvertheknowledgeacademy+1
How can cache poisoning be mitigated?
a. Using DNSSEC
b. Increasing TTL
c. Disabling TCP
d. Ignoring A records
Answer: a. Using DNSSECsanfoundry+1
What is the role of an authoritative DNS server in caching?
a. Stores answers in client cache
b. Provides original data
c. Clears all cache
d. Requests TTL updates
Answer: b. Provides original datatheknowledgeacademy+1
When is a DNS query forwarded beyond the cache?
a. When cache hit occurs
b. If no cache entry exists
c. If TTL is infinite
d. After system sleep
Answer: b. If no cache entry existsprinceton+1
What is a common indicator of DNS cache issues?
a. Slow web page loads
b. Printer errors
c. CPU overheating
d. Missing browser cookies
Answer: a. Slow web page loadsfinalroundai+1
Which query type can bypass DNS cache?
a. Non-recursive query
b. Recursive query
c. Iterative query
d. Broadcast query
Answer: b. Recursive queryakamai+1
On a Linux machine, which command flushes DNS cache?
a. systemd-resolve –flush-caches
b. ping localhost
c. arp -d
d. hostname -I
Answer: a. systemd-resolve –flush-cachesexamtopics+1
Which is NOT a benefit of DNS caching?
a. Reduced latency
b. Improved security
c. Lower network traffic
d. Quicker browsing
Answer: b. Improved securityprinceton+1
What is the default location of Windows DNS cache?
a. Registry
b. RAM
c. Hosts file
d. Disk D:\
Answer: b. RAMscribd+1
Clearing DNS cache after a malware infection is recommended because
a. It updates browser cookies
b. It removes malicious redirections
c. It restarts the system
d. It upgrades the OS
Answer: b. It removes malicious redirectionssanfoundry+1
How frequently should DNS cache be cleared for privacy?
a. Only monthly
b. Regularly, after visiting suspicious sites
c. Never
d. Only on system updates
Answer: b. Regularly, after visiting suspicious sitessanfoundry+1
A short TTL value in DNS records indicates
a. Data is cached longer
b. Frequent record updates
c. Fewer queries
d. Static website usage
Answer: b. Frequent record updatesakamai+1
What type of query stores results in DNS cache?
a. Unicast
b. Recursive
c. ARP
d. DNSSEC
Answer: b. Recursiveprinceton+1
DNS caching can occur on
a. Only servers
b. Only clients
c. Both servers and clients
d. Only routers
Answer: c. Both servers and clientsscribd+2
The most effective way to check for DNS cache poisoning is
a. Verify DNSSEC signatures
b. Reboot router
c. Ping famous websites
d. Use IPv6 only
Answer: a. Verify DNSSEC signaturesbrainscape+1
What is the final step in a DNS query when the cache fails?
a. Fetch from authoritative DNS server
b. Retry local query
c. Use proxy DNS entry
d. Broadcast all packets
Answer: a. Fetch from authoritative DNS serverscribd+1

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