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Network TroubleshootingEasy1 mark(s)

1. 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 time

Network TroubleshootingHard1 mark(s)

2. Which observations can indicate a duplicate IPv4 address problem?

Select all correct answers.

Intermittent connectivityA traceroute always contains exactly one hopDNS TTL is permanently zeroOperating-system duplicate-address warnings may appearARP mappings unexpectedly change between different MAC addresses

Network TroubleshootingEasy1 mark(s)

3. Which Windows command can display the local ARP cache?

Select all correct answers.

nslookup -arparp -aarp -gtracert -mac-tableGet-NetNeighbor can also provide neighbor information in PowerShell

Network TroubleshootingHard1 mark(s)

4. 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 identifyCompare packet behavior at different points when necessaryCollect IP configuration, routing, ARP and DNS evidenceDefine the exact symptom and scope before changing configurationUse ping, traceroute and service-specific tests appropriately

Network TroubleshootingMedium1 mark(s)

5. Which commands can help inspect a Windows host's routing information?

Select all correct answers.

nslookup -routeGet-NetRoute in PowerShellnetstat -rroute printarp -dns

Network TroubleshootingMedium1 mark(s)

6. Which statements correctly describe longest-prefix matching during routing diagnosis?

Select all correct answers.

The most specific matching route is normally selectedA default route overrides every connected routeA matching /24 is more specific than a matching /16A default /0 is used only when no more-specific usable route matchesThe shortest matching prefix always wins

Network TroubleshootingMedium1 mark(s)

7. A website works when accessed by IP address but fails by hostname. Which checks are most relevant?

Select all correct answers.

Replace the Ethernet cable immediately because IP access worksUse nslookup or another DNS tool to query the hostnameVerify the client's DNS server configurationChange the default gateway before checking DNSCheck whether the expected DNS record exists

Network TroubleshootingHard1 mark(s)

8. 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.

Routing asymmetry or return-path problemsDNS resolution as the only possible causeNAT or proxy behavior if present in the pathWhether the HTTPS service is listeningFirewall or ACL policy for TCP 443

Network TroubleshootingEasy1 mark(s)

9. Which statements correctly describe traceroute or tracert?

Select all correct answers.

It can reveal Layer 3 hops toward a destinationIt relies on progressively increasing TTL or Hop Limit valuesIt displays every switch MAC table along the pathIt can help identify where path visibility changesEvery missing hop response proves that router is dropping transit traffic

Network TroubleshootingEasy1 mark(s)

10. Which statements correctly describe nslookup?

Select all correct answers.

It renews DHCP leasesIt can query a specified DNS serverIt can query DNS informationIt can help verify hostname-to-address resolutionIt displays Ethernet switch CAM tables

Network TroubleshootingMedium1 mark(s)

11. Which order follows a sensible layered troubleshooting approach?

Select all correct answers.

Verify IP addressing and local network configurationCheck physical/link state before assuming an application problemThen test DNS, transport ports and applications as neededTest routing and reachabilityBegin by reinstalling every application before checking connectivity

Network TroubleshootingHard1 mark(s)

12. Which symptoms can suggest a firewall or ACL problem?

Select all correct answers.

Traffic succeeds from one source network but fails from another according to policy boundariesEvery DNS failure automatically proves a firewall problemBasic IP reachability works but a required application port is blockedPacket captures show requests reaching a security device without the expected permitted forwardingA disconnected cable always means an ACL denied the traffic

Network TroubleshootingMedium1 mark(s)

13. A host can ping 127.0.0.1 successfully. Which conclusions are reasonable?

Select all correct answers.

The test does not prove physical network connectivityThe Internet connection is definitely workingThe test does not prove the default gateway is reachableDNS resolution is definitely workingThe local IP stack is responding to the loopback test

Network TroubleshootingMedium1 mark(s)

14. Which information can the ARP cache help you troubleshoot on an IPv4 Ethernet network?

Select all correct answers.

Unexpected or stale local neighbor mappingsDNS MX preferencesIPv4-to-MAC address mappings for local neighborsRemote Internet BGP routing tablesWhether the expected gateway MAC has been resolved

Network TroubleshootingMedium1 mark(s)

15. Which packet-capture observations are useful during network troubleshooting?

Select all correct answers.

Whether expected responses returnWhether requests leave the sourceARP requests and replies for local IPv4 neighborsTCP SYN, SYN-ACK, ACK, RST or retransmission behaviorOnly the screen brightness of the endpoint

Network TroubleshootingMedium1 mark(s)

16. Which routing-table entries are especially important when diagnosing remote-network reachability?

Select all correct answers.

The DNS TXT record for the destinationA route matching the destination networkThe next hop or outgoing interface associated with the selected routeThe Ethernet FCS of the last packetThe default route when no more-specific route exists

Network TroubleshootingEasy1 mark(s)

17. Which information can Windows ipconfig help you verify?

Select all correct answers.

Basic interface configurationRemote server application logsEvery router's complete routing tableSubnet mask and default gatewayIPv4 and IPv6 addressing

Network TroubleshootingEasy1 mark(s)

18. Which Windows ipconfig commands are useful for DHCP troubleshooting?

Select all correct answers.

ipconfig /releaseipconfig /allipconfig /route-allipconfig /renewipconfig /tcp-reset-only

Network TroubleshootingHard1 mark(s)

19. A user can reach local devices but not remote networks. Which checks are appropriate?

Select all correct answers.

Inspect relevant routing tablesCheck whether the gateway is locally reachableAssume the NIC is defective because local communication worksVerify upstream firewall or ACL policy where applicableVerify the configured default gateway

Network TroubleshootingMedium1 mark(s)

20. Which sequence is useful for progressively testing IPv4 connectivity?

Select all correct answers.

Test the local IP configurationPing the local default gatewayStart by replacing the network switch without testingTest a known remote IP addressAssume DNS is responsible before testing by IP

Network TroubleshootingEasy1 mark(s)

21. Which information can ipconfig /all commonly display?

Select all correct answers.

Physical or MAC address information for adaptersPasswords stored on remote routersDHCP-related informationDNS server addressesEvery firewall rule on the network

Network TroubleshootingHard1 mark(s)

22. 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 membershipRemote DNS MX recordsPhysical or Layer 2 connectivityGateway interface availability and addressingThe destination website's TLS certificate

Network TroubleshootingMedium1 mark(s)

23. Which statements correctly describe testing a specific application port?

Select all correct answers.

Ping alone does not verify a TCP portTest-NetConnection can test TCP connectivity on Windowsnslookup directly proves an SSH daemon is listeningSuccessful ICMP Echo guarantees TCP 443 is openTools such as nc or telnet can help test suitable TCP services

Network TroubleshootingHard1 mark(s)

24. 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 recordVerify DHCP server or relay availabilityInspect DHCP Discover, Offer, Request and ACK behaviorTroubleshoot HTTPS port 443 firstCheck the endpoint's VLAN assignment

Network TroubleshootingHard1 mark(s)

25. A traceroute shows an asterisk at one intermediate hop but later hops and the destination respond. Which interpretations are reasonable?

Select all correct answers.

The router may be rate-limiting ICMP responsesThe path must be completely broken at that hopThe destination cannot possibly be reachableThe intermediate router may be filtering diagnostic responsesTransit forwarding through that hop is still occurring for the responding later probes

Network Troubleshooting

Network Troubleshooting

1. Which statements correctly describe ping?

2. Which observations can indicate a duplicate IPv4 address problem?

3. Which Windows command can display the local ARP cache?

4. Which checks form a strong general network troubleshooting workflow?

5. Which commands can help inspect a Windows host's routing information?

6. Which statements correctly describe longest-prefix matching during routing diagnosis?

7. A website works when accessed by IP address but fails by hostname. Which checks are most relevant?

8. A client can resolve a server name and ping its IP, but TCP 443 times out. Which areas should be investigated next?

9. Which statements correctly describe traceroute or tracert?

10. Which statements correctly describe nslookup?

11. Which order follows a sensible layered troubleshooting approach?

12. Which symptoms can suggest a firewall or ACL problem?

13. A host can ping 127.0.0.1 successfully. Which conclusions are reasonable?

14. Which information can the ARP cache help you troubleshoot on an IPv4 Ethernet network?

15. Which packet-capture observations are useful during network troubleshooting?

16. Which routing-table entries are especially important when diagnosing remote-network reachability?

17. Which information can Windows ipconfig help you verify?

18. Which Windows ipconfig commands are useful for DHCP troubleshooting?

19. A user can reach local devices but not remote networks. Which checks are appropriate?

20. Which sequence is useful for progressively testing IPv4 connectivity?

21. Which information can ipconfig /all commonly display?

22. A host cannot ping its default gateway and has no ARP entry for the gateway after repeated attempts. Which areas should be investigated?

23. Which statements correctly describe testing a specific application port?

24. A host has address 169.254.20.15 when it should receive an enterprise DHCP address. Which checks are useful?

25. A traceroute shows an asterisk at one intermediate hop but later hops and the destination respond. Which interpretations are reasonable?

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