Which of the following fiber connector types is the most likely to be used on a network interface card?
A. LC
B. SC
C. ST
D. MPO
Show Answer
Correct Answer: A
Explanation: LC connectors are compact and commonly used with fiber-optic network interface cards, particularly on modern equipment. SC and ST connectors are larger, while MPO is typically used for multi-fiber trunk connections.
Question 106
A network engineer queries a hostname using dig, and a valid IP address is returned. However, when the engineer queries that same IP address using dig, no hostname is returned. Which of the following DNS records is missing?
A. MX
B. CNAME
C. AAAA
D. PTR
Show Answer
Correct Answer: D
Explanation: A PTR (Pointer) record maps an IP address back to a hostname through reverse DNS lookup. If the IP query returns no hostname, the PTR record is missing or not configured.
Question 107
A network administrator is creating a copy of network traffic for later analysis. The flow of traffic should not be changed. Which of the following will most directly accomplish this task?
A. SPAN port
B. Network tap
C. Protocol analyzer
D. Link aggregation
Show Answer
Correct Answer: B
Explanation: A network tap is purpose-built to passively duplicate network traffic for monitoring or later analysis without altering the traffic flow. A SPAN port mirrors traffic but can miss packets under load and is switch-dependent. A protocol analyzer captures/analyzes traffic but does not itself create the copy. Link aggregation combines links for bandwidth/redundancy, not traffic duplication.
Question 107
A network engineer receives a vendor alert regarding a vulnerability in a router CPU. Which of the following should the engineer do to resolve the issue?
A. Update the firmware.
B. Replace the system board.
C. Patch the OS.
D. Isolate the system.
Show Answer
Correct Answer: A
Explanation: Apply the vendor’s firmware update to address the router CPU vulnerability. Isolating the router may reduce exposure temporarily, but it does not fix the vulnerability; replacing the system board or patching the OS is not the appropriate general remedy.
Question 108
A network engineer added more APs to improve wireless coverage. However, users now report that the connectivity disconnects and reconnects repeatedly. Which of the following is causing the issue?
A. Throughput capacity
B. Roaming misconfiguration
C. Channel overlap
D. Packet loss
Show Answer
Correct Answer: C
Explanation: Adding more access points without proper channel planning can create co-channel or adjacent-channel interference. Overlapping channels increase interference, leading to unstable wireless connectivity where clients repeatedly disconnect and reconnect. Roaming misconfiguration can cause roaming issues, but the direct consequence of simply adding more APs is most commonly channel overlap.
Question 108
A network manager wants to implement a SIEM system to correlate system events. Which of the following protocols should the network manager verify?
A. NTP
B. DNS
C. LDAP
D. DHCP
Show Answer
Correct Answer: A
Explanation: NTP synchronizes clocks across network devices so their event timestamps are consistent, enabling a SIEM to accurately correlate events from different sources.
Question 108
An organization is experiencing issues with its wireless network. Several APs are placed through-out the building, and only certain areas have a weak signal and low data transfer rates. Which of the following should a wireless technician do first?
A. Deploy additional APs in the problem areas.
B. Increase the transmit power of the APs.
C. Upgrade the antennas on the APs.
D. Update the firmware on the APs.
Show Answer
Correct Answer: B
Explanation: Weak signal in only certain areas suggests a coverage issue. First, check and adjust the existing APs’ transmit power to see whether they can cover those areas before adding or replacing hardware. Avoid excessive power, which can cause interference and may not improve the client-to-AP link.
Question 109
A network technician is working on a PC with a faulty NIC. The host is connected to a switch with secured ports. After testing the connection cables and using a known good NIC. the host is still unable to connect to the network. Which of the following is causing the connection issue?
A. MAC address of the new card
B. BPDU guard settings
C. Link aggregation settings
D. PoE over power budget
Show Answer
Correct Answer: A
Explanation: On a switch with port security enabled, the switchport may be configured to allow only a specific learned or configured MAC address. Replacing the NIC changes the host's MAC address, so the secured port can block traffic from the new NIC until the port security configuration is updated or the secure MAC is relearned. BPDU guard affects switches sending BPDUs, link aggregation is unrelated to a single host NIC replacement, and PoE budget does not affect a typical PC NIC connection.
Question 109
A network administrator is deploying a new switch and wants to make sure that the default priority value was set for a spanning tree. Which of the following values would the network administrator expect to see?
A. 4096
B. 8192
C. 32768
D. 36684
Show Answer
Correct Answer: C
Explanation: The default STP bridge priority is 32768. Priority values are configured in increments of 4096, but 32768 is the default value.
Question 109
A consultant is refreshing the hardware in a large office building. A few IP cameras on the third floor are not online. The consultant troubleshoots the connections and sees the switchports are showing no link light. Which of the following is the most likely cause of this issue?
A. The PoE budget has been exceeded.
B. The switch has a misconfigured VLAN
C. The network video recorder is not on the camera VLAN.
D. The affected cameras are experiencing a wiring issue.
Show Answer
Correct Answer: A
Explanation: The replacement switch may not have enough PoE capacity to power every camera. Cameras denied power cannot establish an Ethernet link, so their switchports show no link light. VLAN or recorder misconfigurations would not prevent a physical link.
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