Which layer determines the availability of communicating partners

What is the information called all the way down the OSI stack

What is an acronym for the OSI model

What is the acronym for data from Transport layer down and what do they stand for

Which layer do UDP and TCP reside in?

You are connected to a server on the Internet and you click a link on the server and receive a time-out message. What layer could be the source of this message?

At which layers of the OSI model do bridges, hubs, and routers primarily operate,
respectively?

Describe Flow Control

What is a virtual circuit also known as?

Describe Acknowledgements

Describe Windowing

What are the two types of packets used at the network layer?

What 3 pieces of information are held in a routing table?

What is the process of adding headers and trailers as the PDU goes down the OSI stack?