A hot site is the disaster recovery solution that the corporation should implement for its critical system that would cause unrecoverable damage to the brand if it was taken offline. A hot site is a fully operational backup site that can take over the primary site's functions in case of a disaster or disruption. A hot site has all the necessary hardware, software, data, network connections, and personnel to resume normal operations with minimal downtime. A hot site is suitable for systems that require high availability and cannot afford any data loss or interruption. References: https://www.enterprisestorageforum.com/management/disaster-recovery-site/
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The end user can access local network shares and intranet pages, which means that the IP address and the subnet mask are configured correctly and the network interface is working properly.
However, the end user is unable to access the internet or remote resources, which means that there is a problem with the name resolution or the routing of the traffic.
The gateway address is responsible for routing the traffic to the destination network, which could be on the internet or another subnet. If the gateway address is incorrect, the end user would not be able to reach any network outside the local subnet.
The DNS servers are responsible for resolving the domain names to the IP addresses, which are needed to communicate with the internet or remote resources. If the DNS servers are incorrect, the end user would not be able to resolve the names of the websites or servers they want to access.
Therefore, the most likely cause of the connectivity issue is that the DNS servers need to be reconfigured with the correct addresses. Reference:
CompTIA Network+ N10-008 Study Guide, Chapter 2: Network Protocols and Services, Section 2.2: TCP/IP Suite, p. 76-77 Network+ N10-008 Practice Test, Question 359 CompTIA Network+ (N10-008) Performance-based Questions (PBQs), Part 1, 1:36

Explanation
MDIX (medium-dependent interface crossover) is a feature that allows network devices to automatically detect and configure the appropriate cabling type, eliminating the need for crossover cables. By enabling MDIX on the switches, a technician can use the original Cat 6 cable to create a crossover connection.
References: CompTIA Network+ Certification Study Guide, Sixth Edition by Glen E. Clarke

TCP/UDP port 5060 is commonly used by VoIP phones. It is the default port for SIP (Session Initiation Protocol), which is a signaling protocol that establishes, modifies, and terminates multimedia sessions over IP networks. SIP is widely used for VoIP applications such as voice and video calls. Reference: https://www.voip-info.org/session-initiation-protocol/

Routing is the process of forwarding packets from one network to another, based on the destination IP address1.
Routing occurs at the network layer of the OSI model, which is the third layer from the bottom2.
The network layer is responsible for logical addressing, path selection, and packet delivery across multiple networks2.
Routers are the devices that operate at the network layer and perform routing functions, using protocols such as RIP, OSPF, EIGRP, or BGP23.
The other layers of the OSI model have different roles in the network communication process, such as:
The data link layer is the second layer from the bottom, and it is responsible for framing, addressing, and error detection of data packets over a single network, using protocols such as Ethernet, Wi-Fi, or PPP2.
The transport layer is the fourth layer from the bottom, and it is responsible for ensuring reliable, error-free, and ordered data transfer between devices, using protocols such as TCP or UDP2.
The physical layer is the bottom layer, and it is responsible for transmitting and receiving bits over a physical medium, such as a cable, a fiber, or a wireless signal2. Reference:
1: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 5: Routing, p. 179
2: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 1: Introduction to Networks, pp. 22-29
3: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 5: Routing, pp. 180-191