HomeDNS & DHCP Practice Quiz SeriesDNS & DHCPFull nameEmail addressGenderSelectMaleFemaleOtherPrefer not to sayCurrent statusSelectSchool studentCollege studentWorking professionalJob seekerTeacher/TrainerOther I agree that my details and score may be stored for quiz administration.Start QuizQuestion 1 of 25DNS & DHCPMedium1 mark(s)1. Which statements about DNS MX records are correct?Select all correct answers.Lower preference values are generally preferred before higher valuesThey map IPv4 addresses directly to MAC addressesThey define DHCP lease durationThey can contain preference valuesThey identify mail servers for a domainDNS & DHCPMedium1 mark(s)2. Which statements about DNS TTL values are correct?Select all correct answers.TTL influences how long a DNS response may be cachedA higher TTL can reduce repeated authoritative queries for unchanged dataTTL permanently prevents a DNS record from changingTTL is the TCP destination port for DNSA lower TTL can cause resolvers to refresh records more frequentlyDNS & DHCPHard1 mark(s)3. Which conditions can cause DHCP clients in one VLAN to fail while clients in another VLAN work?Select all correct answers.The failing VLAN may have an incorrect or missing DHCP relay configurationA VLAN or routing issue may prevent DHCP messages from reaching the serverThe working VLAN proves the DHCP server can never be involvedThe DNS CNAME record for the company website is missingThe DHCP scope for the failing subnet may be exhausted or misconfiguredDNS & DHCPEasy1 mark(s)4. Which statements correctly describe DNS?Select all correct answers.DNS can store multiple types of resource recordsDNS assigns Ethernet MAC addresses to switchesDNS translates domain names into information such as IP addressesDNS is a distributed hierarchical naming systemDNS replaces IP routing between networksDNS & DHCPMedium1 mark(s)5. Which statements about DNS TXT records are correct?Select all correct answers.They can store arbitrary text informationThey are used by mechanisms such as SPFThey can be used for domain ownership or service verificationThey are Ethernet frame headersThey assign dynamic IPv4 addresses to DHCP clientsDNS & DHCPEasy1 mark(s)6. Which UDP port mappings for DHCPv4 are correct?Select all correct answers.DHCP uses UDP rather than requiring a TCP three-way handshakeDHCP server commonly uses UDP port 67DHCP client uses DNS port 53 as its DHCP source portDHCP client commonly uses UDP port 68DHCP server always listens on TCP 67DNS & DHCPMedium1 mark(s)7. Which statements correctly distinguish recursive and authoritative DNS servers?Select all correct answers.A recursive resolver can cache answersA recursive resolver obtains answers on behalf of clientsAn authoritative server must assign IP addresses through DHCPBoth roles are defined by Ethernet switch MAC learningAn authoritative server provides authoritative data for zones it servesDNS & DHCPHard1 mark(s)8. A user can ping a web server by IP address but cannot access it by hostname. Which checks are especially relevant?Select all correct answers.Query the hostname with a DNS troubleshooting tool such as nslookup or digChange the DHCP lease duration before testing DNSVerify the client's configured DNS serverImmediately replace the Ethernet switch because IP ping succeededCheck whether the required DNS record exists and contains the expected dataDNS & DHCPHard1 mark(s)9. A DHCP-configured Windows host receives a 169.254.x.x address instead of the expected corporate subnet. Which areas should be investigated?Select all correct answers.VLAN and Layer 2 connectivity from the clientWhether the website uses HTTPS instead of HTTPDHCP server availabilityDHCP relay configuration when the server is on another subnetWhether the DNS MX preference is too highDNS & DHCPEasy1 mark(s)10. Which statements about DHCP Offer are correct?Select all correct answers.It permanently guarantees the client will use that address without a requestIt is sent by a DHCP server in response to a suitable client discoveryIt can include configuration parameters and lease informationIt is an ARP reply from the default gatewayIt can propose an IPv4 address for the clientDNS & DHCPEasy1 mark(s)11. Which messages make up the classic DHCP DORA process?Select all correct answers.AcknowledgeResolveOfferDiscoverRequestDNS & DHCPEasy1 mark(s)12. Which statements about DHCP ACK are correct?Select all correct answers.It is a TCP acknowledgment packetIt confirms the DHCP lease and configuration from the serverIt means the DNS zone transfer completedIt can include the assigned address and DHCP optionsAfter a valid ACK, the client can normally configure the offered parametersDNS & DHCPMedium1 mark(s)13. Which statements about DNS NS records are correct?Select all correct answers.A zone can have multiple NS recordsThey specify the client's default gatewayThey are important in DNS delegationThey identify authoritative name servers for a DNS zoneThey contain Ethernet VLAN IDsDNS & DHCPMedium1 mark(s)14. Which steps can occur during recursive DNS name resolution?Select all correct answers.The resolver can query an authoritative server for the requested domainThe resolver can consult root and TLD DNS infrastructure when neededThe authoritative DNS server assigns the client's DHCP addressThe resolver must use ARP to contact every DNS server on the Internet directlyA client asks a recursive resolver for a nameDNS & DHCPEasy1 mark(s)15. Which statements correctly describe DHCP leases?Select all correct answers.A lease gives a client use of an address for a defined periodLease time is determined by the Ethernet FCSA DHCP lease makes an IPv4 address permanently owned by the clientLease duration can be configured by the DHCP serviceClients normally attempt to renew leases before expirationDNS & DHCPMedium1 mark(s)16. Which statements about DHCP Request are correct during initial DORA?Select all correct answers.It can indicate the DHCP server selected by the clientThe client uses it to request the offered configurationIt is the same as a DNS A record queryIt helps inform other offering servers that their offers were not selectedIt is sent only after the lease has permanently expiredDNS & DHCPMedium1 mark(s)17. Which statements about DHCP relay are correct?Select all correct answers.It replaces the DHCP server entirelyIt allows DHCP messages to cross a Layer 3 boundary toward a DHCP serverA router or Layer 3 switch can provide relay functionalityIt causes all Ethernet broadcasts to be forwarded unchanged across the InternetIt is useful when clients and DHCP servers are on different subnetsDNS & DHCPEasy1 mark(s)18. Which DNS record type and purpose mappings are correct?Select all correct answers.AAAA — stores an IPv4 subnet maskA — maps a name directly to a MAC addressCNAME — creates an alias to another canonical nameAAAA — maps a name to an IPv6 addressA — maps a name to an IPv4 addressDNS & DHCPEasy1 mark(s)19. Which statements about DHCP Discover are correct?Select all correct answers.It is the server's final confirmation of a leaseIt is a DNS recursive queryIt can be received by DHCP servers or relayed toward themIt is sent by a client seeking DHCP serviceIt is commonly broadcast when the client does not yet have normal IPv4 configurationDNS & DHCPHard1 mark(s)20. Which conditions can cause a DNS name to resolve to an old address after a record was changed?Select all correct answers.A client or application may have cached the previous resultDifferent DNS servers may not yet be serving the intended updated dataDHCP DORA always forces every DNS cache worldwide to refreshARP permanently stores public DNS recordsA recursive resolver may still have a cached answer within its TTLDNS & DHCPHard1 mark(s)21. Which statements about DHCP lease renewal are correct?Select all correct answers.A client must wait until the lease expires before attempting any renewalDNS TTL controls the DHCP T1 timerAt the T1 timer, renewal commonly begins with the original DHCP serverIf normal renewal fails, the client can later enter a rebinding phaseA client normally attempts renewal before its lease expiresDNS & DHCPMedium1 mark(s)22. Which statements correctly describe DNS PTR records?Select all correct answers.They provide the DHCP default gatewayThey are commonly stored under reverse lookup namespacesThey replace A and AAAA records in every forward lookupThey are used for reverse DNS lookupsThey can map an IP-related reverse namespace entry to a hostnameDNS & DHCPMedium1 mark(s)23. Which transport statements about DNS are correct?Select all correct answers.DNS always uses only UDPDNS uses TCP port 443 by definitionTCP may be used for operations such as zone transfers and when required by response behaviorDNS can use TCP port 53DNS commonly uses UDP port 53 for many ordinary queriesDNS & DHCPHard1 mark(s)24. Which checks form a useful DNS and DHCP troubleshooting workflow?Select all correct answers.Test DNS resolution and compare the returned records with expected valuesVerify the client's IP address, mask, gateway, DNS servers, and lease informationInspect DHCP DORA or renewal traffic when address assignment failsAssume every 169.254.x.x address is caused by a bad DNS A recordChange random switch ports without checking VLAN, relay, scope, or packet behaviorDNS & DHCPEasy1 mark(s)25. Which statements correctly describe DHCP?Select all correct answers.DHCP can automatically provide IPv4 configuration to clientsDHCP translates domain names into IP addressesDHCP can provide a subnet maskDHCP can provide a default gateway and DNS server informationDHCP is used to learn switch MAC-table entriesPreviousNextSubmit Quiz Related Discover more from SanchitGurukul Subscribe to get the latest posts sent to your email. Type your email… Subscribe
