If multiple users in a new building are unable to access the company's intranet site via their web browser but are able to access internet sites, the network administrator can resolve this issue by correcting the DNS server entries in the DHCP scope. The DHCP scope is responsible for assigning IP addresses and DNS server addresses to clients. If the DNS server entries are incorrect, clients will not be able to access intranet sites.
Reference:
CompTIA Network+ Certification Study Guide, Exam N10-007, Fourth Edition, Chapter 4: Network Implementations, Objective 4.4: Explain the purpose and properties of DHCP.

A software-defined network (SDN) is a network architecture that decouples the control plane from the data plane and centralizes the network intelligence in a software controller. The control plane is the part of the network that makes decisions about how to route traffic, while the data plane is the part of the network that forwards traffic based on the control plane's instructions. The control layer is the layer in an SDN that contains the controller and the routing protocols that communicate with the network devices. The control layer is responsible for managing and configuring the network devices and providing them with the necessary information to forward traffic. Reference: https://www.comptia.org/training/books/network-n10-008-study-guide (page 378)

A botnet is a collection of internet-connected devices that are compromised and controlled by hackers, often without the knowledge of the device owners. Hackers use botnets to launch various types of malicious attacks, such as distributed denial-of-service (DDoS), spam, phishing, crypto-mining, and more123.
To create a botnet, hackers need to infect the devices with malware that allows them to remotely control them and communicate with other infected devices. Malware can be delivered through various methods, such as phishing emails, malicious websites, drive-by downloads, exploit kits, and more12.
Therefore, one of the ways that compromises internet-connected devices and makes them vulnerable to becoming part of a botnet is B. Malware infection. Malware infection can affect any type of device that connects to the internet, such as computers, smartphones, tablets, routers, cameras, smart TVs, and more12.
Another way that compromises internet-connected devices and makes them vulnerable to becoming part of a botnet is E. Use of default credentials. Many internet-connected devices come with default usernames and passwords that are easy to guess or find online. Hackers can use these credentials to access the devices and install malware or change their settings12.
Therefore, another answer is E. Use of default credentials. Use of default credentials can affect any type of device that has a web interface or a remote login service, such as routers, cameras, printers, smart devices, and more12.
The other options are incorrect for the following reasons:
A . Deauthentication attack is a type of attack that targets wireless networks and devices. It involves sending spoofed deauthentication frames to disconnect the devices from the network or force them to reconnect. It does not compromise the devices or make them part of a botnet, but it can disrupt their communication or enable other attacks.
C . IP spoofing is a technique that involves forging the source IP address of a packet or a request. It can be used to hide the identity of the attacker, bypass security filters, or perform reflection or amplification attacks. It does not compromise the devices or make them part of a botnet, but it can make the attacks harder to trace or block.
D . Firmware corruption is a type of attack that targets the firmware of a device, which is the software that controls its basic functions and hardware. It involves modifying or replacing the firmware with malicious code that can damage the device, change its behavior, or allow remote access. It can compromise the devices or make them part of a botnet, but it is not a common or easy method, as it requires physical access or a specific vulnerability to exploit.
F . Dictionary attack is a type of attack that involves guessing passwords or encryption keys by using a list of common or likely words. It can be used to gain unauthorized access to accounts, devices, or data. It can compromise the devices or make them part of a botnet, but it is not a specific or efficient method, as it requires a lot of time and resources to perform. Reference:
1: What is a Botnet and How to Protect Your Devices in 2024 - VPNOverview.com
2: What is a botnet? When infected devices attack | CSO Online
3: What is a DDoS Botnet | Common Botnets and Botnet Tools | Imperva
4: Deauthentication attack - Wikipedia
5: IP spoofing - Wikipedia
6: Firmware - Wikipedia
7: Dictionary attack - Wikipedia

Client roaming refers to the ability of a wireless device to seamlessly connect to a different access point (AP) as the user moves around the facility. This can help to improve network stability and reduce interruptions in mobile applications. An extended service deployment is a type of wireless network configuration that uses multiple APs to cover a large area, such as a warehouse facility. By using a wireless controller to manage the APs, the network can be better optimized for client roaming, which can improve network stability.
"Roaming With multiple WAPs in an ESS, clients will connect to whichever WAP has the strongest signal. As clients move through the space covered by the broadcast area, they will change WAP connections seamlessly, a process called roaming."

802.11n is a wireless standard that supports up to 600 Mbps data rate and operates in both the 2.4 GHz and 5 GHz frequency bands. 802.11n uses multiple-input multiple-output (MIMO) technology to increase the number of spatial streams and improve the wireless performance and range. 802.11n meets the requirements of the wireless network design.