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What does CNAME stand for in networking?
a. Common Name
b. Canonical Name
c. Client Name
d. Computer Network
Answer: b. Canonical Namewikipedia+2
What is the primary function of a CNAME record?
a. To point a domain name to an IP address
b. To map an alias domain name to a canonical domain name
c. To direct email traffic
d. To map a domain to a mail server
Answer: b. To map an alias domain name to a canonical domain namednsimple+2
In DNS, what type of record is used to map a domain directly to an IP address?
a. MX record
b. A record
c. CNAME record
d. TXT record
Answer: b. A recorddnsimple+1
Can a CNAME record point directly to an IP address?
a. Yes
b. No
c. Sometimes
d. Only for IPv6
Answer: b. Nokeycdn+1
In which scenario is a CNAME record most commonly used?
a. Managing email delivery
b. Managing subdomains
c. Setting up FTP services
d. DNSSEC implementation
Answer: b. Managing subdomainsionos+2
Which record type cannot coexist with a CNAME record for the same hostname?
a. A record
b. MX record
c. TXT record
d. All of the above
Answer: d. All of the abovecloud.ibm+2
What is the typical use of a CNAME record for www.example.com?
a. Point www.example.com to example.com
b. Point www.example.com to the mail server
c. Point www.example.com to an IP address
d. Point www.example.com to a server’s MAC address
Answer: a. Point www.example.com to example.comnslookup+1
What happens if the IP address of the target domain changes for a CNAME record?
a. Manual update required for all aliases
b. Automatic update for all aliases
c. No change required
d. All aliases break
Answer: b. Automatic update for all aliasesdigicert+2
Is it considered valid DNS practice to add a CNAME record to the root (apex) of a domain?
a. Yes
b. No
c. Only for subdomains
d. Only for MX records
Answer: b. Novalimail+2
Which DNS record type typically points email traffic?
a. MX record
b. CNAME record
c. NS record
d. A record
Answer: a. MX recordkeycdn+2
What limitation does a CNAME record have regarding the coexistence with other records?
a. A CNAME can share the same name with an A record
b. A CNAME cannot share the same name with any other record type
c. A CNAME must have a TXT record
d. None
Answer: b. A CNAME cannot share the same name with any other record typednsimple+2
When a DNS resolver encounters a CNAME record, what does it do?
a. Returns an error
b. Follows the alias to resolve the canonical name
c. Points to an IP address
d. Redirects to the root domain
Answer: b. Follows the alias to resolve the canonical nameibm+2
Which record type allows direct mapping to IPv6 addresses?
a. AAAA record
b. MX record
c. CNAME record
d. Domain record
Answer: a. AAAA recordcloud.ibm+1
What is the impact of multiple chained CNAME records in DNS?
a. Faster resolution
b. Slower resolution and increased lookups
c. DNS caching is disabled
d. No impact
Answer: b. Slower resolution and increased lookupsreddit+2
What is a common security risk associated with CNAME records?
a. DNS hijacking
b. Server overload
c. Email spoofing
d. Network congestion
Answer: a. DNS hijackingthreatngsecurity+1
CNAME records can be used to alias which types of network services?
a. Only web servers
b. Only mail servers
c. Any network service with a hostname
d. Only FTP servers
Answer: c. Any network service with a hostnamebigrock+2
What is TTL in the context of a CNAME record?
a. Total Traffic Limit
b. Time To Live
c. Transfer To Location
d. Target Time Load
Answer: b. Time To Livegcore+1
What happens if a DNS query for a CNAME-aliased domain is made?
a. DNS resolver returns IP address directly
b. Resolver follows CNAME chain to canonical name and returns final IP address
c. Email is sent
d. Query fails
Answer: b. Resolver follows CNAME chain to canonical name and returns final IP addressibm+2
Can MX or NS records point to a CNAME record?
a. Yes
b. No
c. Only MX records
d. Only NS records
Answer: b. Nokeycdn+1
What component of a CNAME record defines how long the record will be cached by DNS resolvers?
a. Hostname
b. Record Type
c. TTL
d. Canonical Name
Answer: c. TTLgcore+1
Why are CNAME records not allowed on the apex/root of a domain by default?
a. To allow coexistence with other essential DNS records
b. For faster DNS resolution
c. To prevent duplicate IP addresses
d. To secure email delivery
Answer: a. To allow coexistence with other essential DNS recordsionos+2
Which record type provides flexibility for frequent IP address changes?
a. TXT record
b. MX record
c. CNAME record
d. NS record
Answer: c. CNAME recorddnsimple+2
What is a disadvantage of using DNS CNAME records for critical sites?
a. Increased DNS resolution time
b. Decreased reliability
c. Not RFC compliant
d. Cannot be cached
Answer: a. Increased DNS resolution timeeitca+1
Which special record type is sometimes used to overcome CNAME root domain limitations?
a. Alias Record
b. AAAA Record
c. MX Record
d. TXT Record
Answer: a. Alias Recorddigicert+1
Can there be multiple CNAME records with the same name in the same domain?
a. Yes
b. No
c. Only with MX record
d. Only in subdomains
Answer: b. Nocloud.ibm+1
What is a benefit of managing multiple related domains with CNAME records?
a. Always requires manual updating
b. Easy to update target if hosting changes
c. IP addresses must be changed individually
d. CNAMEs work only with IPv6
Answer: b. Easy to update target if hosting changesdnsimple+1
What does a DNS client do after receiving a CNAME record response?
a. Initiates a query for the canonical name
b. Connects directly to IP address
c. Returns error to user
d. Refuses the connection
Answer: a. Initiates a query for the canonical namenslookup+2
Which of the following is a potential security risk for cloud service providers using CNAMEs?
a. Subdomain takeover
b. Hardware failure
c. Data redundancy
d. Malformed packets
Answer: a. Subdomain takeoverthreatngsecurity
What should be regularly audited to ensure DNS security best practices?
a. Only MX records
b. All TXT records
c. All CNAME records
d. AAAA records
Answer: c. All CNAME recordsthreatngsecurity
A CNAME record maps which to which?
a. IP address to IP address
b. IP address to domain name
c. Domain name to another domain name
d. Domain name to MX record
Answer: c. Domain name to another domain namewikipedia+2
What does “CNAME chaining” refer to?
a. Pointing several CNAMEs in sequence before reaching a final address
b. Mapping multiple IP addresses
c. Creating redundant A records
d. Using MX with CNAME
Answer: a. Pointing several CNAMEs in sequence before reaching a final addressreddit+1
What best practice should be followed when pointing CNAMEs to external domains?
a. Use random domain targets
b. Only use internal domains
c. Consider possible security risks
d. Ignore updates
Answer: c. Consider possible security riskseitca+1
What happens if you attempt to add a CNAME record to a hostname that already has an MX record?
a. Allowed, but no effect
b. Not allowed; conflicts in DNS
c. Enhances mail delivery
d. Creates duplicate records
Answer: b. Not allowed; conflicts in DNSdnsimple+2
What is required for a CNAME record change to be recognized globally?
a. Immediate DNS propagation
b. Local server restart
c. DNS propagation, which may require up to several hours
d. No action required
Answer: c. DNS propagation, which may require up to several hoursgoogle+1
Which is a benefit of using a CNAME record when integrating third-party cloud services?
a. Requires root domain
b. Easy change management of provider hostnames
c. Must update A record for every IP change
d. Prevents external access
Answer: b. Easy change management of provider hostnamesvalimail+2
CNAME records can be used to direct traffic for which type of digital asset?
a. Only websites
b. Only FTP
c. Websites, email, FTP, and other hostnames
d. Only IPv6 addresses
Answer: c. Websites, email, FTP, and other hostnamesbigrock+2
Which field must be unique in every CNAME record for a domain?
a. TTL
b. Alias
c. Hostname
d. Target domain
Answer: c. Hostnamegcore+1
What precaution should organizations take when using CNAME to alias APIs or dev environments?
a. Ignore SSL warnings
b. Use default settings
c. Restrict unauthorized access
d. Always use root domains
Answer: c. Restrict unauthorized accessthreatngsecurity
What does DNSSEC provide when implemented with CNAME records?
a. Email validation
b. Cryptographic security for DNS data
c. Faster resolution
d. TTL extension
Answer: b. Cryptographic security for DNS datathreatngsecurity
Which component of a DNS CNAME record holds the alias value?
a. Hostname
b. TTL
c. Value field
d. MX target
Answer: c. Value fieldbigrock+1
Who manages authoritative DNS servers with CNAME records?
a. The local ISP
b. Internal company admin or DNS provider
c. Internet standards organizations
d. Root DNS servers only
Answer: b. Internal company admin or DNS providergcore
What is a possible consequence of pointing a CNAME to an expired domain?
a. Increased traffic
b. Subdomain takeover
c. Faster DNS resolution
d. Email forwarding failure
Answer: b. Subdomain takeoverthreatngsecurity
Why are CNAME records beneficial for companies using CDNs?
a. Prevent content caching
b. Easily switch CDN providers by changing the target
c. Require manual updates for IP addresses
d. Enhance hardware security
Answer: b. Easily switch CDN providers by changing the targetdigicert+1
Which record type is not affected by CNAME limitations?
a. A record at root domain
b. MX record on subdomain
c. AAAA record at root domain
d. TXT record for www
Answer: b. MX record on subdomainkeycdn
Can a CNAME record be used for domain verification procedures (e.g., Google)?
a. Yes
b. No
c. Only for A records
d. Only MX records
Answer: a. Yesbigrock+1
What should the “Points to” field in a CNAME record contain?
a. IP address
b. Canonical domain name
c. TXT record target
d. Subdomain value only
Answer: b. Canonical domain namehitchhikers.yext+2
Which of the following is NOT a valid reason to use a CNAME record?
a. To mirror the main domain for user-friendly URLs
b. To manage cloud service endpoints
c. To point directly to an IP address
d. To update only one destination if hosting changes
Answer: c. To point directly to an IP addresswikipedia+1
What online DNS management platforms commonly support CNAME records?
a. Email servers
b. Only local DNS servers
c. GoDaddy, Cloudflare, DNSimple, IONOS
d. Social media websites
Answer: c. GoDaddy, Cloudflare, DNSimple, IONOScloudflare+3
Why is it risky to use CNAME records without regular auditing?
a. Increased latency
b. Possible misconfiguration and security vulnerabilities
c. Slower email delivery
d. Reduces TTL
Answer: b. Possible misconfiguration and security vulnerabilitieseitca+1
Which RFC outlines key limitations of CNAME records?
a. RFC 1912
b. RFC 1000
c. RFC 1035
d. RFC 2821
Answer: a. RFC 1912keycdn

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