Practice Quiz SeriesNetwork TroubleshootingFull 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 25Network TroubleshootingMedium1 mark(s)1. Which statements correctly describe longest-prefix matching during routing diagnosis?Select all correct answers.The shortest matching prefix always winsA matching /24 is more specific than a matching /16A default route overrides every connected routeThe most specific matching route is normally selectedA default /0 is used only when no more-specific usable route matchesNetwork TroubleshootingEasy1 mark(s)2. Which statements correctly describe traceroute or tracert?Select all correct answers.It relies on progressively increasing TTL or Hop Limit valuesIt can reveal Layer 3 hops toward a destinationIt displays every switch MAC table along the pathEvery missing hop response proves that router is dropping transit trafficIt can help identify where path visibility changesNetwork TroubleshootingEasy1 mark(s)3. Which Windows command can display the local ARP cache?Select all correct answers.tracert -mac-tablearp -aGet-NetNeighbor can also provide neighbor information in PowerShellarp -gnslookup -arpNetwork TroubleshootingMedium1 mark(s)4. Which order follows a sensible layered troubleshooting approach?Select all correct answers.Verify IP addressing and local network configurationTest routing and reachabilityBegin by reinstalling every application before checking connectivityThen test DNS, transport ports and applications as neededCheck physical/link state before assuming an application problemNetwork TroubleshootingMedium1 mark(s)5. Which sequence is useful for progressively testing IPv4 connectivity?Select all correct answers.Test a known remote IP addressTest the local IP configurationPing the local default gatewayStart by replacing the network switch without testingAssume DNS is responsible before testing by IPNetwork TroubleshootingMedium1 mark(s)6. Which packet-capture observations are useful during network troubleshooting?Select all correct answers.ARP requests and replies for local IPv4 neighborsWhether requests leave the sourceTCP SYN, SYN-ACK, ACK, RST or retransmission behaviorOnly the screen brightness of the endpointWhether expected responses returnNetwork TroubleshootingMedium1 mark(s)7. Which commands can help inspect a Windows host's routing information?Select all correct answers.arp -dnsroute printnetstat -rGet-NetRoute in PowerShellnslookup -routeNetwork TroubleshootingHard1 mark(s)8. Which symptoms can suggest a firewall or ACL problem?Select all correct answers.Every DNS failure automatically proves a firewall problemPacket captures show requests reaching a security device without the expected permitted forwardingBasic IP reachability works but a required application port is blockedTraffic succeeds from one source network but fails from another according to policy boundariesA disconnected cable always means an ACL denied the trafficNetwork TroubleshootingHard1 mark(s)9. A user can reach local devices but not remote networks. Which checks are appropriate?Select all correct answers.Check whether the gateway is locally reachableAssume the NIC is defective because local communication worksVerify upstream firewall or ACL policy where applicableInspect relevant routing tablesVerify the configured default gatewayNetwork TroubleshootingHard1 mark(s)10. A host cannot ping its default gateway and has no ARP entry for the gateway after repeated attempts. Which areas should be investigated?Select all correct answers.Local VLAN membershipGateway interface availability and addressingRemote DNS MX recordsThe destination website's TLS certificatePhysical or Layer 2 connectivityNetwork TroubleshootingHard1 mark(s)11. A traceroute shows an asterisk at one intermediate hop but later hops and the destination respond. Which interpretations are reasonable?Select all correct answers.Transit forwarding through that hop is still occurring for the responding later probesThe intermediate router may be filtering diagnostic responsesThe path must be completely broken at that hopThe destination cannot possibly be reachableThe router may be rate-limiting ICMP responsesNetwork TroubleshootingMedium1 mark(s)12. A website works when accessed by IP address but fails by hostname. Which checks are most relevant?Select all correct answers.Check whether the expected DNS record existsVerify the client's DNS server configurationUse nslookup or another DNS tool to query the hostnameChange the default gateway before checking DNSReplace the Ethernet cable immediately because IP access worksNetwork TroubleshootingEasy1 mark(s)13. Which information can Windows ipconfig help you verify?Select all correct answers.Remote server application logsBasic interface configurationEvery router's complete routing tableIPv4 and IPv6 addressingSubnet mask and default gatewayNetwork TroubleshootingHard1 mark(s)14. A host has address 169.254.20.15 when it should receive an enterprise DHCP address. Which checks are useful?Select all correct answers.Change the DNS CNAME recordCheck the endpoint's VLAN assignmentVerify DHCP server or relay availabilityInspect DHCP Discover, Offer, Request and ACK behaviorTroubleshoot HTTPS port 443 firstNetwork TroubleshootingMedium1 mark(s)15. A host can ping 127.0.0.1 successfully. Which conclusions are reasonable?Select all correct answers.DNS resolution is definitely workingThe test does not prove the default gateway is reachableThe test does not prove physical network connectivityThe Internet connection is definitely workingThe local IP stack is responding to the loopback testNetwork TroubleshootingMedium1 mark(s)16. Which information can the ARP cache help you troubleshoot on an IPv4 Ethernet network?Select all correct answers.Remote Internet BGP routing tablesDNS MX preferencesIPv4-to-MAC address mappings for local neighborsWhether the expected gateway MAC has been resolvedUnexpected or stale local neighbor mappingsNetwork TroubleshootingHard1 mark(s)17. Which observations can indicate a duplicate IPv4 address problem?Select all correct answers.A traceroute always contains exactly one hopDNS TTL is permanently zeroOperating-system duplicate-address warnings may appearARP mappings unexpectedly change between different MAC addressesIntermittent connectivityNetwork TroubleshootingMedium1 mark(s)18. Which routing-table entries are especially important when diagnosing remote-network reachability?Select all correct answers.The default route when no more-specific route existsThe Ethernet FCS of the last packetA route matching the destination networkThe DNS TXT record for the destinationThe next hop or outgoing interface associated with the selected routeNetwork TroubleshootingEasy1 mark(s)19. Which statements correctly describe ping?Select all correct answers.Repeated probes can reveal observed packet lossSuccessful ping proves every TCP service is availableIt commonly tests reachability using ICMP Echo messagesPing retrieves DNS zone filesIt can report approximate round-trip timeNetwork TroubleshootingMedium1 mark(s)20. Which statements correctly describe testing a specific application port?Select all correct answers.nslookup directly proves an SSH daemon is listeningTools such as nc or telnet can help test suitable TCP servicesPing alone does not verify a TCP portTest-NetConnection can test TCP connectivity on WindowsSuccessful ICMP Echo guarantees TCP 443 is openNetwork TroubleshootingEasy1 mark(s)21. Which statements correctly describe nslookup?Select all correct answers.It renews DHCP leasesIt can query DNS informationIt displays Ethernet switch CAM tablesIt can query a specified DNS serverIt can help verify hostname-to-address resolutionNetwork TroubleshootingHard1 mark(s)22. Which checks form a strong general network troubleshooting workflow?Select all correct answers.Make multiple unrelated changes simultaneously so the root cause is harder to identifyDefine the exact symptom and scope before changing configurationCompare packet behavior at different points when necessaryUse ping, traceroute and service-specific tests appropriatelyCollect IP configuration, routing, ARP and DNS evidenceNetwork TroubleshootingEasy1 mark(s)23. Which information can ipconfig /all commonly display?Select all correct answers.DNS server addressesPhysical or MAC address information for adaptersPasswords stored on remote routersEvery firewall rule on the networkDHCP-related informationNetwork TroubleshootingEasy1 mark(s)24. Which Windows ipconfig commands are useful for DHCP troubleshooting?Select all correct answers.ipconfig /allipconfig /route-allipconfig /renewipconfig /releaseipconfig /tcp-reset-onlyNetwork TroubleshootingHard1 mark(s)25. A client can resolve a server name and ping its IP, but TCP 443 times out. Which areas should be investigated next?Select all correct answers.NAT or proxy behavior if present in the pathDNS resolution as the only possible causeRouting asymmetry or return-path problemsWhether the HTTPS service is listeningFirewall or ACL policy for TCP 443PreviousNextSubmit Quiz Related Discover more from SanchitGurukul Subscribe to get the latest posts sent to your email. 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