Question Q-5861 A network engineer is designing a wireless deployment. Users in…
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CompTIA Network+ N10-009 - Domains 1 and 2 Fundamentals and Implementations
By Jordan Blake · Updated Jul 10, 2026
| Questions | 25 |
| Passing Score | 75% |
| Format | 100% Multiple Choice |
| Sessions Logged | 668 |
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Cable categories: Cat5e gig, Cat6/6a 10G shorter runs. Plenum-rated for HVAC spaces — fire code question.
Straight-through vs crossover vs rollover — modern auto-MDIX means crossover less hands-on, still on test.
STP blocks loops by electing root bridge and blocking redundant paths. RSTP is faster convergence.
+2 votesBroadcast storm symptom: switch CPU pegged, lights blinking like crazy. Fix topology, don't just reboot forever.
IPv6: shortened notation rules, ::1 loopback, link-local fe80::/10. Dual-stack coexistence with IPv4.
SLAAC vs DHCPv6 — stateless autoconfig doesn't hand DNS by itself; DHCPv6 can.
Router = Layer 3, switch = Layer 2, hub = Layer 1 dinosaur. 'Primarily operates' wording is key.
PDU names: L2 frame, L3 packet, L4 segment. Net+ still tests OSI even if you live in TCP/IP daily.
Wireless standards: Wi-Fi 6/6E/7 — know frequency bands and max theoretical vs real throughput.
2.4 GHz penetrates walls better; 5/6 GHz less congestion. Channel overlap on 2.4 = pick 1,6,11.
802.1Q tags VLAN ID on trunk. Native VLAN mismatch = stealthy intermittent issues — match both ends.
Access port = one VLAN untagged; trunk carries multiple. Don't put voice and data on same VLAN without design.
Subnetting: AND mask with IP to get network address. /26 = 64 hosts block — practice until it's muscle memory.
CIDR notation beats classful A/B/C on N10-009 but they still reference legacy classes in explanations.
DNS resolves names; DHCP hands addresses; NAT/PAT for IPv4 conservation. Port 53 vs 67/68 — memorize.
APIPA 169.254.x.x when DHCP fails — ties to troubleshooting domain quiz later.
Question catalog for this preview
Catalog listing of the 5 preview questions for this quiz.
Question 1
A company has a switch loop causing a broadcast storm. What protocol prevents switching loops while maintaining redundant paths?
Explanation
STP (802.1D) and RSTP (802.1w — Rapid STP) prevent Layer 2 loops by logically blocking redundant paths while maintaining them for failover. LACP (802.3ad) bundles multiple links into one logical link. VLANs segment broadcast domains but don't prevent loops.
Question 2
A network administrator wants to combine two 1-Gbps links between two switches into a single 2-Gbps logical link with redundancy. Which technology accomplishes this?
Explanation
LACP (Link Aggregation Control Protocol, 802.3ad) creates port channels/EtherChannels by bundling multiple physical links into one logical link, increasing bandwidth and providing redundancy. If one link fails, traffic continues on the remaining links.
Question 3
A network administrator uses a sniffer and sees ARP requests being sent from one workstation for every IP address on the subnet in sequence. What is MOST likely occurring?
Explanation
Sequential ARP requests for all IPs on a subnet is characteristic of a network scanner performing ARP scan/host discovery (e.g., nmap -sn, arp-scan). It may indicate authorized IT scanning or an attacker performing reconnaissance to discover active hosts.
Question 4
Which wireless standard is also known as "Wi-Fi 6" and introduces OFDMA and Target Wake Time (TWT) for improved efficiency?
Explanation
802.11ax (Wi-Fi 6, released 2019) introduces OFDMA (for better multi-user efficiency), MU-MIMO, BSS Coloring (reduce inter-BSS interference), and TWT (Target Wake Time, improves IoT device battery life). Wi-Fi 6E extends to 6 GHz band.
Question 5
A network administrator configures a router with a static route: `ip route 10.20.0.0 255.255.0.0 192.168.1.1`. What does the IP address 192.168.1.1 represent in this command?
Explanation
In the `ip route [destination] [mask] [next-hop or exit-interface]` syntax, 192.168.1.1 is the next-hop router's IP address. Traffic destined for the 10.20.0.0/16 network will be forwarded to 192.168.1.1, which will route it further.
Single-mode fiber = long distance, laser, yellow jacket common. Multimode = shorter, LED/VCSEL, orange/aqua.
Connector types: LC small form, SC square — know patch panel vs backbone distances for exam scenarios.