- (Topic 3)
Which of the following would be the MOST cost-effective recovery solution for a company's lower-priority applications?

1. A. Warm site
2. B. Cloud site
3. C. Hot site
4. D. Cold site

Correct Answer: C

- (Topic 3)
A network engineer is interested in using wireless technologies in densely forested areas. Which of the following frequencies would be best for this use?

1. A. 2.4GHz
2. B. 5GHz
3. C. 5.9GHz
4. D. 6GHz

Correct Answer: A
2.4GHz frequency has better penetration and range than higher frequencies in forested environments, where there are many obstacles and interference sources.
References:
✑ Wireless in The Woods: Experimental Evaluation of IEEE 802.11a/b/g in Forested Environments1
✑ High-Speed Wireless Access in Forested Rural Areas Using Analog Radio Over Fiber2

- (Topic 3)
A security administrator is trying to prevent incorrect IP addresses from being assigned to clients on the network. Which of the following would MOST likely prevent this and allow the network to continue to operate?

1. A. Configuring DHCP snooping on the switch
2. B. Preventing broadcast messages leaving the client network
3. C. Blocking ports 67/68 on the client network
4. D. Enabling port security on access ports

Correct Answer: A
To prevent incorrect IP addresses from being assigned to clients on the network and allow the network to continue to operate, the security administrator should consider configuring DHCP (Dynamic Host Configuration Protocol) snooping on the switch. DHCP snooping is a security feature that is used to prevent unauthorized DHCP servers from operating on a network. It works by allowing the switch to monitor and validate DHCP traffic on the network, ensuring that only legitimate DHCP messages are forwarded to clients. This can help to prevent incorrect IP addresses from being assigned to clients, as it ensures that only authorized DHCP servers are able to provide IP addresses to clients on the network.

- (Topic 3)
A junior network administrator is auditing the company network and notices incrementing input errors on a long-range microwave interface. Which of the following is the most likely reason for the errors?

1. A. The parabolic signal is misaligned.
2. B. The omnidirectional signal is being jammed.
3. C. The omnidirectional signal is not strong enough to receive properly.
4. D. The parabolic signal uses improper routing protocols.

Correct Answer: A
A long-range microwave interface is a type of wireless communication that uses high- frequency radio waves to transmit and receive data over long distances. A long-range microwave interface typically uses a parabolic antenna, also known as a dish antenna, to focus the radio waves into a narrow beam that can travel farther and with less interference than an omnidirectional antenna, which radiates the radio waves in all directions1.
One of the most common causes of input errors on a long-range microwave interface is the misalignment of the parabolic antenna. Input errors are errors that occur when the receiver cannot properly decode or process the incoming signal. If the parabolic antenna is not aligned correctly with the transmitter, the receiver may not be able to capture the full strength of the signal, or it may pick up unwanted noise or interference from other sources. This can result in corrupted or lost data, which will increase the input error count23.
To troubleshoot this issue, the junior network administrator should check the alignment of the parabolic antenna and make sure it is pointing directly at the transmitter. The administrator can use tools such as a spectrum analyzer, a signal strength meter, or a path alignment tool to measure and adjust the signal quality and alignment of the antenna24. The other options are not likely reasons for the input errors on a long-range microwave interface. A long-range microwave interface does not use an omnidirectional signal, so it cannot be jammed or weakened by other sources. The parabolic signal does not depend on the routing protocols used by the network, so it cannot be affected by improper routing protocols.

- (Topic 3)
After upgrading to a SOHO router that supports Wi-Fi 6, the user determines throughput has not increased. Which of the following is the MOST likely cause of the issue?

1. A. The wireless router is using an incorrect antenna type.
2. B. The user's workstation does not support 802.11 ax.
3. C. The encryption protocol is mismatched
4. D. The network is experiencing interference.

Correct Answer: B
The user’s workstation does not support 802.11 ax, which is the technical name for Wi-Fi 6. Wi-Fi 6 is a new wireless standard that offers faster speeds, higher capacity, and lower latency than previous standards. However, to take advantage of these
benefits, both the router and the workstation need to support Wi-Fi 6. If the workstation only supports an older standard, such as 802.11 ac or Wi-Fi 5, then the throughput will not increase even if the router supports Wi-Fi 6. References: [CompTIA Network+ Certification Exam Objectives], What is Wi-Fi 6? Here’s what you need to know | PCWorld