Clients report that phones are down. The network technicians determine that PCs and printers are online. However, the phones display the message Searching for service. Which of the following should the technicians check first?
A. PoE statistics on the switch
B. DHCP options
C. Data VLANs on switchports
D. The default gateway on the switch
Show Answer
Correct Answer: B
Explanation: IP phones typically power on via PoE and obtain an IP address via DHCP, but they also rely on specific DHCP options (such as Option 66 or 150) to locate the TFTP/call manager. If these options are missing or incorrect, phones will power up yet remain stuck at "Searching for service," while PCs and printers continue to work normally.
Question 48
A company reports that their facsimile machine no longer has a dial tone when trying to send a fax. The phone cable is damaged on one end. Which of the following types of connectors should a technician replace?
A. F-type
B. RJ45
C. SC
D. RJ11
Show Answer
Correct Answer: D
Explanation: Fax machines use analog telephone lines connected to the PSTN, which use RJ11 modular connectors. A damaged phone cable end would require replacing an RJ11 connector, not F-type (coax), RJ45 (Ethernet), or SC (fiber).
Question 49
Which of the following could provide a lightweight and private connection to a remote box?
A. Site-to-site VPN
B. Telnet
C. Console
D. Secure Shell
Show Answer
Correct Answer: D
Explanation: A lightweight and private connection requires encryption and minimal overhead. Secure Shell (SSH) provides encrypted, authenticated remote access over the network and is widely used for managing remote systems. Site-to-site VPNs are heavier and meant for network-to-network links, Telnet is unencrypted and insecure, and a console connection is typically local rather than remote.
Question 50
A network engineer is troubleshooting connectivity for a newly installed server on an existing VLAN. The engineer reviews the following requested output:
The engineer then logs in to the router and runs the following:
Which of the following describes the issue?
A. The server has an incorrect subnet mask.
B. There is a duplicate IP address on the network.
C. The DHCP address pool is exhausted.
D. The router is missing a default route.
Show Answer
Correct Answer: A
Explanation: The server is configured with a /27 subnet mask, while the router interface for the VLAN is using a /24 mask. This mismatch causes the server to believe it is on a different subnet (192.168.100.224/27) and prevents proper communication with the router. Therefore, the issue is an incorrect subnet mask on the server.
Question 51
A network administrator recently configured an autonomous wireless AP and performed a throughput test via comptiaspeedtester.com. The result was 75Mbps. When connected to other APs, the results reached 500Mbps. Which of the following is most likely the reason for this difference?
A. Channel width configuration
B. DNS server issues
C. Authentication failure
D. Incorrect DHCP settings
Show Answer
Correct Answer: A
Explanation: A throughput of ~75 Mbps is characteristic of a wireless AP using a narrow 20 MHz channel width, which limits maximum data rates. Other APs achieving ~500 Mbps are likely configured with wider channels (40 MHz or 80 MHz), allowing much higher throughput. DNS, authentication, or DHCP issues would not selectively cap wireless throughput to this level.
Question 52
A company is installing network cables above the ceiling tiles. The cables must be fire rated. Which of the following cable types should the company use?
A. Coaxial
B. Plenum
C. Crossover
D. STP
Show Answer
Correct Answer: B
Explanation: Cables installed above ceiling tiles are typically in plenum spaces used for air circulation. Fire and building codes require plenum-rated (CMP) cables in these areas because they have fire-retardant, low-smoke jackets that reduce flame spread and toxic fumes. Other options describe connector types or shielding, not fire ratings.
Question 53
Several unauthorized APs near the corporate headquarters are broadcasting similar SSIDs. Which of the following types of attacks is being described?
A. Evil twin
B. Wi-Fi jamming
C. On-path
D. Wardriving
Show Answer
Correct Answer: A
Explanation: Multiple unauthorized access points broadcasting the same or very similar SSIDs as a legitimate corporate network describes an evil twin attack. In this attack, attackers set up rogue APs to impersonate the real network and lure users into connecting, enabling credential theft or man-in-the-middle activity. The other options do not involve impersonating SSIDs.
Question 54
Which of the following is the best way to reduce the likelihood of electrostatic discharge?
A. Uninterruptable power supply
B. Surge protector
C. Power distribution units
D. Temperature and humidity control
Show Answer
Correct Answer: D
Explanation: Electrostatic discharge is strongly influenced by environmental conditions, especially humidity. Low humidity allows static electricity to build up more easily on people and equipment. Proper temperature and humidity control reduces static buildup and therefore lowers the risk of ESD. The other options address power quality or distribution, not static electricity.
Question 55
Which of the following troubleshooting steps would provide a change advisory board with the information needed to make a decision?
A. Identify the problem.
B. Develop a theory of probable cause.
C. Test the theory to determine cause.
D. Establish a plan of action.
Show Answer
Correct Answer: D
Explanation: A Change Advisory Board needs enough information to evaluate and approve or reject a change, including what will be done, how it will be done, potential risks, and rollback steps. This information is provided when you establish a plan of action. The earlier troubleshooting steps identify and analyze the problem but do not yet present a concrete, reviewable change plan.
Question 56
A company recently implemented a videoconferencing system that utilizes large amounts of bandwidth. Users start reporting slow internet speeds and an overall decrease in network performance. Which of the following are most likely the causes of the network performance issues? (Choose two.)
A. DNS misconfiguration
B. Inadequate network security
C. Malware or a virus
D. Outdated software
E. Incorrect QoS settings
F. Network congestion
Show Answer
Correct Answer: E, F
Explanation: A newly implemented videoconferencing system is bandwidth-intensive and generates real-time traffic. This commonly leads to network congestion when available bandwidth is insufficient (F). Additionally, if Quality of Service (QoS) is configured incorrectly or not at all, video traffic may not be properly prioritized, causing widespread performance degradation for both video and other applications (E).
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