CompTIA Network+ (N10-009) - Blueprint Practice Exam 1

1. A branch router needs reliable, ordered delivery for a file transfer. Which transport protocol supplies retransmission and sequence tracking?
2. A client must discover the mail servers responsible for a domain. Which DNS record type should it query?
3. A company connects multiple branch networks through an overlay that centrally selects paths across broadband and private circuits. What technology fits?
4. A company wants ongoing measurements of interface utilization and error counters without unencrypted community strings. Which choice fits?
5. A company wants users and devices authenticated before a wired switch port grants normal network access. Which mechanism fits?
6. A DHCP client is on a different subnet from its DHCP server. Which router function normally forwards its discovery traffic to that server?
7. A fiber link fails immediately after technicians reconnect a duplex patch pair. Optics and distance specifications match. What is a sensible physical check?
8. A fiber link must cover 15 km between buildings. Which medium is generally the best fit when paired with suitable optics?
9. A guest wireless client should access the internet but never internal file servers. What is the best network control?
10. A host can reach local peers but not any remote subnet. Its IP address and mask are correct. Which setting should be checked next?
11. A host has address 192.0.2.130/26. What is its subnet's network address?
12. A laptop has a weak Wi-Fi signal only inside a newly installed metal-walled storage room. What is the most likely cause?
13. A monitoring team needs to see which endpoints exchange the most traffic without collecting complete packet payloads. Which data source best fits?
14. A network has redundant Layer 2 switch paths that could create a forwarding loop. Which protocol addresses this risk?
15. A network requires a subnet with at least 50 usable IPv4 host addresses. What is the smallest conventional subnet prefix that meets this requirement?
16. A new host uses 169.254.34.8 and cannot reach routed resources. Other hosts have normal DHCP leases. What is the most relevant initial check?
17. A new IP camera powers on only when an external adapter is connected. The switch port provides data but no power. What should be checked first?
18. A real-time voice call has uneven packet arrival despite acceptable average latency. Which metric best describes that variation?
19. A rogue device sends forged ARP replies to redirect nearby clients through itself. Which switch feature helps defend against this attack when properly configured?
20. A router chooses between routes to 203.0.113.0/24 and 203.0.113.128/25 for destination 203.0.113.140. Which route wins before other tie-breakers are considered?
21. A server needs a predictable DHCP-assigned IP address while retaining central management of lease settings. Which approach is appropriate?
22. A server needs two physical switch links to act as one logical link with compatible dynamic negotiation. What should be configured?
23. A server-room technician finds that incoming cables are unsupported and sharply bent behind the rack. Which improvement is most appropriate?
24. A switch forwards an Ethernet frame using its destination MAC address. At which OSI layer is this forwarding decision normally made?
25. A switch port stays down when a known-good laptop and cable are connected. Adjacent ports work, and the port configuration shows administrative shutdown. What should be done after confirming authorization?
26. A team needs a reliable record of which switch port serves each wall jack. Which document is most useful?
27. A Wi-Fi survey finds overlapping 2.4 GHz access points using 20 MHz channels 1, 2, and 3. Which change best reduces adjacent-channel overlap in a US deployment?
28. A wireless deployment requires enterprise authentication with individual identities instead of one shared passphrase. Which design fits?
29. A workstation can reach 198.51.100.20 by address but cannot reach the same service by hostname. What should be checked first?
30. An access switch must carry VLANs 10 and 20 to a distribution switch over one Ethernet link. What configuration is appropriate?
31. An administrator replaces Telnet with SSH for switch management. What is the main security improvement?
32. An attacker floods an internet circuit with more traffic than its capacity. Which defense can address saturation before it reaches that circuit?
33. An IPv6 host sends traffic to FF02::1 on its local link. What delivery type is it using?
34. An office must restore its WAN service within two hours of an outage. Which recovery metric states that limit?
35. Before a routing change, an engineer records the current configuration, expected impact, test steps, and rollback plan. What process does this support?
36. Network logs from different devices disagree on event timing. What should the administrator deploy or repair?
37. Small pings succeed through a VPN, but large packets with the do-not-fragment bit fail. What issue is most likely?
38. Two devices intermittently lose connectivity, and logs show one IPv4 address alternating between two MAC addresses. What is the likely problem?
39. Users report poor throughput on a copper Ethernet link whose interface shows many CRC errors. What should be investigated first?
40. Which two addresses belong to private IPv4 address ranges? Select 2.

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