The subnet mask 255.255.255.240 corresponds to a /28 subnet. A /28 provides 16 total IP addresses, of which 14 are usable (excluding the network and broadcast addresses). Since the requirement is 13 usable IPs, this mask fits perfectly.

If a workstation can access the internet and printers (likely in another VLAN) but not internal servers, the port was likely placed into the wrong VLAN after the move. VLAN assignment controls Layer 2 segmentation, restricting access to resources on different VLANs.
* A. A wrong default gateway would prevent internet access.
* C. An error-disabled port would block all connectivity.
* D. A duplicate IP would cause general network issues, not just missing server access.
References (CompTIA Network+ N10-009):
* Domain: Network Troubleshooting - VLAN misconfiguration, connectivity issues.

See the Explanation for detailed information on this simulation.
Explanation:
(Note: Ips will be change on each simulation task, so we have given example answer for the understanding) To perform a network discovery by entering commands into the terminal, you can use the following steps:
Click on each switch to open its terminal window.
Enter the command show ip interface brief to display the IP addresses and statuses of the switch interfaces.
Enter the command show vlan brief to display the VLAN configurations and assignments of the switch interfaces.
Enter the command show cdp neighbors to display the information about the neighboring devices that are connected to the switch.
Fill in the missing information in the diagram using the drop-down menus provided.
Here is an example of how to fill in the missing information for Core Switch 1:
The IP address of Core Switch 1 is 192.168.1.1.
The VLAN configuration of Core Switch 1 is VLAN 1: 192.168.1.0/24, VLAN 2: 192.168.2.0/24, VLAN 3:
192.168.3.0/24.
The neighboring devices of Core Switch 1 are Access Switch 1 and Access Switch 2.
The interfaces that connect Core Switch 1 to Access Switch 1 are GigabitEthernet0/1 and GigabitEthernet0/2.
The interfaces that connect Core Switch 1 to Access Switch 2 are GigabitEthernet0/3 and GigabitEthernet0/4.
You can use the same steps to fill in the missing information for Access Switch 1 and Access Switch 2.

A self-assigned IP address (typically in the 169.254.x.x range, also known as an APIPA address) indicates that the computer attempted to obtain an IP address via DHCP but did not receive a response.
An RFC1918 address (like 192.168.x.x or 10.x.x.x) is a private IP address range, not self- assigned. If the TCP/IP stack were disabled, the system wouldn't have any IP address or network functionality at all. A static IP address is manually set, not self-assigned via APIPA.
The most likely cause is that the DHCP server is unavailable.

Troubleshooting Methodology:
Confirming the Root Cause: After testing and confirming the theory, the next logical step is to address the issue by implementing a solution.
Implementation of the Solution:
Resolve the Issue: Implement the identified solution to rectify the problem. This step involves making necessary changes to the network configuration, replacing faulty hardware, or applying software patches.
Documentation: Document the solution and the steps taken to resolve the issue to provide a reference for future troubleshooting.