One of the best practices for network hardening is to disable unneeded switchports. This prevents unauthorized devices from connecting to the network and reduces the attack surface. Disabling unneeded ports also conserves power and bandwidth. To disable a port on a Cisco switch, the administrator can use the following commands:
switch# configure terminalswitch(config)# interface fastethernet 0/1switch(config-if)# shutdownswitch(config-if)# end Disabling SSH service is not a good idea, as SSH provides secure remote access to the switch. Disabling MAC filtering or port security would weaken the security of the switch, as it would allow any device to connect to any port. MAC filtering and port security are techniques that limit the number of MAC addresses or devices that can access a port. References: Chapter 18. Network Hardening Techniques - CompTIA Network+ N10-008 Cert Guide, CompTIA Network+ Exam N10-008 - Lesson 19: Applying Network Hardening Techniques, CompTIA Network+ N10-008 | Udemy

Integrity is the security concept that is related to ensuring that encrypted data is not edited while in transit. Integrity is one of the three main goals of information security, along with confidentiality and availability. Integrity means that data is protected from unauthorized modification or corruption during storage, processing, or transmission. Integrity can be achieved by using various techniques, such as hashing, digital signatures, checksums, or message authentication codes (MACs). These techniques can verify the authenticity and validity of the data by detecting any changes or tampering that may have occurred. Reference: [CompTIA Network+ Certification Exam Objectives], What Is Data Integrity? | Definition & Examples | Forcepoint

Explanation
A toner is a tool that generates an audible signal that can be traced by a probe. A network technician can use a toner to identify the appropriate patch panel port by connecting the toner to one end of the patch cord and using the probe to scan the patch panel until the signal is detected. A toner is the easiest way to identify the patch panel port when the patch panel is not labeled, as it does not require a laptop, a cable tester, or a visual fault locator. A toner can also be used to locate breaks or shorts in a cable, or to verify continuity.
References:
Using a Toner and Probe - CompTIA Network+ Certification (N10-008): The Total Course Video CompTIA Network+ Certification Exam Objectives, page 141

NFV allows network functions, such as firewalls, routers, and load balancers, to be virtualized and run on industry-standard servers instead of having dedicated hardware appliances. This approach enables network services to be rapidly deployed, scaled, and managed in a more flexible and cost-effective manner. By using NFV, the company can create a virtual replica of its physical network, with the same logical topology and behavior, while running network functions as virtualized instances.

* A VLAN is a virtual local area network that logically separates devices on the same physical network.
VLANs can improve network performance, security, and management by reducing broadcast domains and isolating traffic.
* A DHCP reservation is a feature that allows a network administrator to assign a specific IP address to a device based on its MAC address. This ensures that the device always receives the same IP address from the DHCP server, even if the lease expires or the device reboots.
* A networked printer is a device that can be shared by multiple users on the same network. A networked printer typically has a built-in network interface card (NIC) that allows it to communicate with other devices using TCP/IP protocols.
* A print server is a device or a software application that manages the printing requests from multiple clients. A print server can also provide additional features such as print queue management, printer driver installation, and printer status monitoring.
* A subnet is a logical division of an IP network that allows devices to communicate more efficiently and securely. A subnet is defined by a network address and a subnet mask, which determine the range of valid IP addresses within the subnet. Devices on the same subnet can communicate directly with each other without the need for a router.
* A ping is a network diagnostic tool that tests the connectivity and reachability between two devices by sending and receiving echo packets. A ping request can fail for various reasons, such as network congestion, firewall settings, routing issues, or device configuration errors.
* Based on the question, the networked printer is unavailable because it cannot be pinged from the print server in the same subnet. This means that there is a problem with the layer 2 connectivity between the two devices, which is determined by the MAC addresses and the VLANs. The most likely cause of this problem is that the printer and the print server are on different VLANs, which prevents them from communicating with each other. The other options are less likely because they affect the layer 3 connectivity, which is determined by the IP addresses and the gateways. A DNS failure would not affect the ping request, since it uses IP addresses and not hostnames. A DHCP scope exhaustion would not affect the printer, since it has a DHCP reservation that guarantees its IP address. An incorrect gateway would not affect the communication within the same subnet, since it is only used for routing packets to other networks. References:
* CompTIA Network+ N10-008 Study Guide, Chapter 2: Network Devices and Technologies, Section
2.2: Network Device Functions and Features, Subsection: Print Servers, pp. 76-77.
* CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Operations, Section 3.3: Network Configuration Management, Subsection: DHCP, pp. 144-146.
* CompTIA Network+ N10-008 Study Guide, Chapter 4: Network Security, Section 4.2: Network Segmentation and Isolation, Subsection: VLANs, pp. 202-204.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 1.5: Network Troubleshooting Methodology, Subsection: Identify the Problem, pp. 16-17.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.2: Network Devices, Subsection: Print Servers, p. 28.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.6: Network Addressing, Subsection: DHCP, p. 38.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.7: Network Addressing, Subsection: Subnetting, p. 39.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 3.5: Network Segmentation, Subsection: VLANs, p. 58.