Explanation:
* Yes.
Layer 7 TCP/IP protocols include:
HTTP, Hypertext Transfer Protocol
Telnet, a remote terminal access protocol
SMTP, Simple Mail Transfer Protocol
TFTP, Trivial File Transfer Protocol, a simple file transfer protocol
* No.
The session layer (layer 5) controls the dialogues (connections) between computers. The transport layer provides the functional and procedural means of transferring variable-length data sequences from a source to a destination host via one or more networks, while maintaining the quality of service functions.
* Yes.
The network layer provides the functional and procedural means of transferring variable length data sequences (called datagrams) from one node to another connected to the same network. It translates logical network address into physical machine address. A network is a medium to which many nodes can be connected, on which every node has an address and which permits nodes connected to it to transfer messages to other nodes connected to it by merely providing the content of a message and the address of the destination node and letting the network find the way to deliver ("route") the message to the destination node.

Shielded cable, here STP Cat5e, would reduce interference.

https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/ipconfig

Explanation/Reference:
WAN Protocols and Their Corresponding OSI Layers