Q#1: DNS stands for:
(A) Data Naming System
(B) Domain Name System
(C) Digital Network Service
(D) Domain Network Server
Answer: (B) Domain Name System
Q#2: DNS is used to translate:
(A) MAC address to IP address
(B) IP address to MAC address
(C) Domain name to IP address
(D) Port number to IP address
Answer: (C) Domain name to IP address
Q#3: DNS works at which layer of the TCP/IP model?
(A) Transport layer
(B) Network layer
(C) Application layer
(D) Data Link layer
Answer: (C) Application layer
Q#4: Which protocol does DNS primarily use?
(A) TCP
(B) UDP
(C) ICMP
(D) ARP
Answer: (B) UDP
Q#5: DNS commonly uses port number:
(A) 20
(B) 21
(C) 53
(D) 80
Answer: (C) 53
Q#6: DNS database is structured as a:
(A) Linear list
(B) Tree hierarchy
(C) Ring topology
(D) Mesh topology
Answer: (B) Tree hierarchy
Q#7: The top level of DNS hierarchy is:
(A) Domain
(B) Root
(C) Subdomain
(D) Host
Answer: (B) Root
Q#8: The root domain is represented by:
(A) /
(B) @
(C) .
(D) #
Answer: (C) .
Q#9: .com is an example of:
(A) Country domain
(B) Top-Level Domain (TLD)
(C) Subdomain
(D) Hostname
Answer: (B) Top-Level Domain (TLD)
Q#10: .pk is an example of:
(A) Generic TLD
(B) Country Code TLD
(C) Root domain
(D) Subdomain
Answer: (B) Country Code TLD
Q#11: A fully qualified domain name (FQDN) ends with:
(A) Slash
(B) Colon
(C) Dot
(D) Number
Answer: (C) Dot
Q#12: Which DNS server knows about the root zone?
(A) Local DNS server
(B) Root server
(C) Mail server
(D) Proxy server
Answer: (B) Root server
Q#13: A DNS query that asks the server to resolve fully is called:
(A) Iterative query
(B) Recursive query
(C) Static query
(D) Dynamic query
Answer: (B) Recursive query
Q#14: In iterative query, the server:
(A) Resolves completely
(B) Returns best possible answer
(C) Ignores request
(D) Encrypts data
Answer: (B) Returns best possible answer
Q#15: DNS records are stored in:
(A) Frames
(B) Zones
(C) Segments
(D) Packets
Answer: (B) Zones
Q#16: A record that maps domain name to IPv4 address is:
(A) AAAA
(B) MX
(C) A
(D) CNAME
Answer: (C) A
Q#17: A record that maps domain name to IPv6 address is:
(A) A
(B) AAAA
(C) PTR
(D) NS
Answer: (B) AAAA
Q#18: MX record is used for:
(A) Web server
(B) Mail server
(C) File server
(D) Proxy server
Answer: (B) Mail server
Q#19: CNAME record stands for:
(A) Canonical Name
(B) Central Name
(C) Common Name
(D) Control Name
Answer: (A) Canonical Name
Q#20: PTR record is used for:
(A) Forward lookup
(B) Reverse lookup
(C) Mail routing
(D) Encryption
Answer: (B) Reverse lookup
Q#21: DNS caching helps to:
(A) Increase delay
(B) Reduce lookup time
(C) Remove domains
(D) Change IP
Answer: (B) Reduce lookup time
Q#22: TTL in DNS stands for:
(A) Total Transfer Length
(B) Time To Live
(C) Temporary Table Link
(D) Transmission Time Limit
Answer: (B) Time To Live
Q#23: If DNS fails, users cannot:
(A) Send email
(B) Browse websites by name
(C) Use IP address
(D) Access LAN
Answer: (B) Browse websites by name
Q#24: Authoritative DNS server:
(A) Caches records only
(B) Provides original domain data
(C) Encrypts DNS
(D) Blocks traffic
Answer: (B) Provides original domain data
Q#25: DNS uses TCP when:
(A) Query is small
(B) Zone transfer occurs
(C) Only IPv4
(D) Only IPv6
Answer: (B) Zone transfer occurs
Q#26: Zone transfer is used to:
(A) Encrypt data
(B) Copy DNS database between servers
(C) Map IP
(D) Route packets
Answer: (B) Copy DNS database between servers
Q#27: DNS is a:
(A) Centralized system
(B) Distributed system
(C) Static file
(D) Routing protocol
Answer: (B) Distributed system
Q#28: Local DNS server is also called:
(A) Root server
(B) Resolver
(C) Gateway
(D) Switch
Answer: (B) Resolver
Q#29: Reverse DNS lookup maps:
(A) Name to IP
(B) IP to name
(C) MAC to IP
(D) Port to IP
Answer: (B) IP to name
Q#30: Which record specifies name servers for a domain?
(A) NS
(B) MX
(C) A
(D) TXT
Answer: (A) NS
Q#31: DNS improves user convenience by:
(A) Using numbers
(B) Using names instead of IP
(C) Removing IP
(D) Blocking traffic
Answer: (B) Using names instead of IP
Q#32: Which organization manages global DNS root?
(A) IEEE
(B) ICANN
(C) ISO
(D) ITU
Answer: (B) ICANN
Q#33: DNS query resolution follows:
(A) Linear path
(B) Hierarchical structure
(C) Ring structure
(D) Bus topology
Answer: (B) Hierarchical structure
Q#34: A subdomain is:
(A) Higher than root
(B) Part of main domain
(C) IP address
(D) Port number
Answer: (B) Part of main domain
Q#35: DNS servers communicate using:
(A) HTTP
(B) FTP
(C) UDP/TCP
(D) ARP
Answer: (C) UDP/TCP
Q#36: The maximum UDP DNS message size is traditionally:
(A) 256 bytes
(B) 512 bytes
(C) 1024 bytes
(D) 2048 bytes
Answer: (B) 512 bytes
Q#37: Which DNS record stores text information?
(A) TXT
(B) MX
(C) NS
(D) PTR
Answer: (A) TXT
Q#38: DNS spoofing is a type of:
(A) Routing
(B) Security attack
(C) Encryption
(D) Switching
Answer: (B) Security attack
Q#39: DNS cache poisoning affects:
(A) IP routing
(B) DNS resolution
(C) MAC addressing
(D) Port numbers
Answer: (B) DNS resolution
Q#40: Primary DNS server contains:
(A) Backup copy
(B) Original zone file
(C) Only cache
(D) Only IP
Answer: (B) Original zone file
Q#41: Secondary DNS server obtains data from:
(A) Users
(B) Primary server
(C) Router
(D) Switch
Answer: (B) Primary server
Q#42: Recursive resolver performs:
(A) Partial resolution
(B) Complete resolution
(C) No resolution
(D) Routing
Answer: (B) Complete resolution
Q#43: DNS name resolution is required before:
(A) Sending packet
(B) Web access
(C) Routing
(D) Switching
Answer: (B) Web access
Q#44: DNS query types include:
(A) Iterative and Recursive
(B) Static and Dynamic
(C) Fast and Slow
(D) Direct and Indirect
Answer: (A) Iterative and Recursive
Q#45: DNS database entries are called:
(A) Frames
(B) Records
(C) Segments
(D) Bits
Answer: (B) Records
Q#46: A DNS zone may contain multiple:
(A) Frames
(B) Resource records
(C) Ports
(D) Routers
Answer: (B) Resource records
Q#47: Which record maps alias to canonical name?
(A) MX
(B) CNAME
(C) A
(D) PTR
Answer: (B) CNAME
Q#48: DNS enhances internet usability by:
(A) Increasing delay
(B) Reducing memory
(C) Simplifying addressing
(D) Removing IP
Answer: (C) Simplifying addressing
Q#49: DNS primarily provides:
(A) Reliable transport
(B) Name resolution
(C) Encryption
(D) Flow control
Answer: (B) Name resolution
Q#50: Without DNS, users must remember:
(A) Port numbers
(B) MAC addresses
(C) IP addresses
(D) Hostnames
Answer: (C) IP addresses