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Question 130
A browser fails to resolve `helpdesk.example.test`, but the user still has an IP route. The technician needs to query DNS resolution directly and inspect the returned records. Which tool is appropriate?
- Run ip route show default and infer DNS record results from the next-hop IP
- Run nslookup or dig for the specified name
- Run ip address show to examine local prefixes without sending a DNS query
- Run ss -lnt to list local TCP listening sockets
Explanation
Correct Answer
B:A DNS lookup utility directly queries configured or selected resolvers.
Incorrect Answers
A:A working default route does not establish whether the DNS resolver returns the requested hostname record.
C:Local interface addressing is distinct from actually querying a resolver for the failed hostname.
D:Open local listening ports do not report the DNS records returned for a remote name.
Question 131
Three nearby 2.4-GHz access points are constrained to 20-MHz channels, and the local regulatory domain permits channels 1, 6 and 11. Which channel plan minimizes adjacent-channel overlap?
- Use 20 MHz channels 1, 3 and 5 on adjacent 2.4-GHz access points
- Use 20 MHz channels 1, 4 and 7 because their numeric spacing is uniform
- Use 40 MHz channels centered on 1, 6 and 11 to double 2.4-GHz spectral reuse
- Plan 20 MHz channels 1, 6 and 11 in the permitted regulatory domain
Explanation
Correct Answer
D:The common 1, 6 and 11 plan provides adequately separated 20 MHz channels where all are permitted, reducing adjacent-channel overlap.
Incorrect Answers
A:Channels 1, 3 and 5 are spaced too closely for typical 20 MHz 2.4-GHz channels, creating substantial adjacent-channel overlap.
B:Uniform three-channel number spacing does not ensure non-overlapping RF spectra; channel centers at 1, 4 and 7 remain too close.
C:Wider 40 MHz channels consume more spectrum and reduce the number of non-overlapping placements within the narrow 2.4-GHz band.
Question 132
Users need to select the enterprise wireless network from the advertised list while multiple AP radios broadcast the same logical network. Which WLAN identifier is the shared network name, not an individual radio's BSSID?
- The AP radio BSSID, which can differ when the client roams to another AP on the same WLAN
- The locally administered client MAC address, which identifies one station rather than a WLAN name
- The controller WLAN profile ID, which is a management identifier rather than the SSID shown to users
- The WLAN service set identifier (SSID), shared by APs advertising the same logical network
Explanation
Correct Answer
D:The SSID is the logical WLAN name in beacon or probe information, and multiple APs can legitimately advertise the same SSID.
Incorrect Answers
A:A BSSID uniquely distinguishes an individual basic service set or AP radio; the situation calls for the common advertised network name instead.
B:A client MAC is associated with a particular station and cannot label the logical network shared by all participating AP radios.
C:A controller-assigned profile index identifies a configuration object but is not what end users select in their Wi-Fi network list.
Question 133
A campus has already assigned adjacent 2.4-GHz APs to an approved nonoverlapping 20-MHz channel plan. Nevertheless, overpowered overlapping cells on a reused channel cause high co-channel airtime contention and sticky clients. Which RF design controls should be adjusted next to reduce excessive cell overlap without changing the established channel plan?
- Tune channel reuse and power levels
- Use the WLAN SSID
- Perform an RF survey measuring RSSI and SNR
- Plan 2.4 GHz channels 1, 6 and 11 where permitted
Explanation
Correct Answer
A:Co-channel contention can be reduced by better channel assignment and transmit-power planning across AP cells. Simply boosting all radios can enlarge contention domains and make the shared airtime problem worse.
Incorrect Answers
B:An SSID labels the wireless service but does not change AP cell power or overlap in the existing RF plan.
C:An RF survey can quantify RSSI, SNR and interference, but merely taking measurements does not adjust the excessive transmit power and cell boundaries specified here.
D:The existing nonoverlapping-channel allocation has already been applied. Repeating a channel 1/6/11 recommendation alone does not address excessive power and same-channel cell overlap in this case.
Question 134
A guest WLAN must use modern authenticated and encrypted client access rather than open or WEP-only security. Which supported WPA2-AES/WPA3 profile family meets that requirement subject to client compatibility?
- Enable WEP shared-key encryption and hide the SSID to replace WPA2
- Enable WPA1 with TKIP-only data protection and leave client authentication unchanged
- Configure a compatible WPA2-AES/CCMP or WPA3 security profile with supported authentication
- Use an open SSID with MAC address filtering as the sole confidentiality mechanism
Explanation
Correct Answer
C:A supported WPA2-AES or WPA3 profile provides modern encrypted wireless link protection with the corresponding approved authentication method.
Incorrect Answers
A:WEP is a legacy weak security mechanism and an undisclosed network name does not provide modern authenticated encryption.
B:WPA1/TKIP is legacy protection and does not satisfy the requested modern WPA2-AES or WPA3 profile requirement.
D:A client MAC filter controls a proposed admission list but cannot provide the cryptographic confidentiality required for protected wireless payloads.
Question 135
A warehouse has variable rack attenuation and reports roaming gaps. Before changing AP positions, the engineer needs measured RSSI, SNR and coverage boundaries along actual client paths. Which survey method should be performed?
- Perform an on-site WLAN survey recording RSSI, SNR, coverage boundaries and client roaming points
- Read the configured controller SSID list without measuring client-path radio conditions
- Increase every AP to maximum transmit power before measuring the warehouse RF field
- Use an ordinary wired cable certification report to infer 802.11 coverage through shelving
Explanation
Correct Answer
A:A site survey samples received signal and noise along the real client paths and identifies poor coverage and roaming transitions before placement changes.
Incorrect Answers
B:A WLAN configuration list identifies network names but cannot measure site-specific attenuation, noise or coverage gaps caused by shelving.
C:Raising every radio to full power may worsen interference and sticky roaming, and cannot replace the requested baseline RSSI/SNR observations.
D:Wired cable tests assess Ethernet conductors; they do not characterize wireless propagation, reflection, attenuation or roaming quality inside the warehouse.
Question 136
A hallway client remains connected to a distant AP at high power while a closer AP has coverage. Which combination of AP transmit power and placement decisions can shrink overlarge RF cells?
- Reduce excessive AP power and adjust AP placement using the observed roaming/coverage overlap
- Raise all AP transmit power to maximum to extend the already overlarge RF cells
- Configure 40 MHz width on every 2.4-GHz channel to force sticky clients to roam
- Change the SSID string on one AP while leaving power and physical coverage unchanged
Explanation
Correct Answer
A:Tuning physical placement and per-cell transmit power can shrink excessive overlap while maintaining required coverage and more effective channel reuse.
Incorrect Answers
B:Increasing transmit power expands radio cells and is likely to aggravate the existing overreach and co-channel contention.
C:Widening 2.4-GHz channels consumes more spectrum and does not intrinsically change a client’s roaming threshold or reduce oversized cells.
D:Renaming a logical network changes association identity, not the original physical RF field or transmit-power footprint described.
Question 137
A dense 2.4-GHz WLAN is impaired by channel occupancy, and a supported dual/tri-band client fleet is available. Which less-congested band option can increase channel reuse where local rules and hardware allow?
- Increase every 2.4-GHz AP to maximum power while staying on the crowded band
- Retain the 2.4-GHz band but enable more overlapping 40 MHz channels
- Evaluate supported and permitted 5-GHz or 6-GHz channels for less-contended airtime
- Require old 802.11b rates on all radios to preserve maximum 2.4-GHz airtime efficiency
Explanation
Correct Answer
C:Eligible clients and APs can use less-contended 5-GHz or 6-GHz spectrum when supported and permitted, subject to coverage and regulatory assessment.
Incorrect Answers
A:Higher 2.4-GHz transmit power can enlarge contention domains instead of reducing occupancy by nearby interferers.
B:Wider overlapping 2.4-GHz channels reduce efficient reuse within its limited available spectrum and do not avoid 2.4-GHz-only interferers.
D:Legacy low-rate 802.11b traffic consumes disproportionate airtime and remains inside the already congested 2.4-GHz band.
Question 138
A client roams between two Cisco access points that advertise the same employee SSID. The WLAN name stays constant, but the engineer needs to distinguish the specific serving AP radio/basic service set to which the client is associated. Which identifier is used?
- The common SSID string broadcast by both APs
- The client device’s IPv4 default-gateway address
- The BSSID, a MAC-derived identifier of the particular AP radio/basic service set
- The network’s common WPA2 or WPA3 authentication method
Explanation
Correct Answer
C:A BSSID identifies the specific basic service set/AP radio instance, allowing association and roaming diagnostics when the SSID does not change.
Incorrect Answers
A:An SSID identifies the logical WLAN name and can be intentionally shared by many APs, so it does not identify the serving radio.
B:The default gateway supports routed traffic from the client and does not uniquely distinguish which Wi-Fi radio serves the association.
D:Two APs can use the same wireless authentication method while advertising different BSSIDs; authentication type is not the per-radio identifier.
Question 139
A Wi-Fi survey measures received signal at -62 dBm and background noise at -90 dBm at one workstation. Assuming both use the same reference scale, what is the signal-to-noise ratio in dB at that point?
- 28 dB
- -152 dB
- -28 dB
- 62 dB
Explanation
Correct Answer
A:SNR in dB is the difference of the signal level and noise level: -62 - (-90) = +28 dB, which represents the desired signal's margin above the measured noise.
Incorrect Answers
B:Adding both negative dBm readings is not how their power ratio is expressed in decibels; signal-to-noise ratio uses subtraction of logarithmic levels.
C:Noise is 28 dB below signal, so signal-minus-noise is positive 28 dB rather than a negative 28 dB.
D:The magnitude of the signal's negative dBm level alone is not SNR; the measured noise level must also be considered.
Question 140
A small office has supported WPA2-Personal clients that do not implement WPA3 SAE, and must use an encrypted PSK WLAN rather than WEP or TKIP-only. Which security choice is appropriate?
- Use WPA2 with TKIP-only protection to avoid AES-CCMP requirements
- Use an open WLAN with hidden SSID and no link-layer encryption
- Use WPA3-SAE-only authentication even though the stated clients do not support SAE
- Use WPA2-Personal with AES-CCMP and a strong shared passphrase
Explanation
Correct Answer
D:WPA2-Personal with AES-CCMP provides supported encrypted client access with the matching strong PSK for this fleet.
Incorrect Answers
A:TKIP-only is legacy protection and does not meet the requested WPA2-AES security baseline for the supported devices.
B:Disabling encryption and hiding a WLAN name does not provide WPA2-Personal authenticated confidentiality.
C:WPA3-only SAE cannot be used by the stipulated client fleet lacking SAE support, even if the platform itself supports WPA3.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests
