Question

You have installed a device at the physical layer. All of the systems you connect to this device will talk to each other at the same time. What have you installed?

Answer 1

APPLICATION

Explanation:

Application

The layers of OSI model are:

Application

Presentation

Session

Transport

Network

Datalink

Physical

So we installed a device in physical laeyr means a server,hardware system,computer or mobile

Inordere to connect with the server and communicate with eachother like telegram or whatsapp

We are installing an application(Telegram,Whatsapp) rightThe application at application level will make us use the service by server easily through GUI  

So we install an application

The answer is an application

Answer 2

Answer:

Hub

Explanation:

Hub work on physical layer and transfer the data packets from one port to all other throughout the network since it is unintelligent and doesn't works keeps record of addresses unlike switch.