Which layer of the OSI model does the Internet Protocol (IP) operate at?

A router connects three links (networks). How many of each of the following layers can the router be involved?

In a corporate network setup, the company's main office is connected to several branch offices. The local network within each branch office is an example of:

What does TCP/IP stand for?

What is the primary function of the Transmission Control Protocol (TCP)?

A company has multiple branch offices located in different cities, and they are all interconnected to form a cohesive network. The network that spans across these geographically dispersed locations is an example of

In the TCP/IP model, which layer is responsible for logical addressing and routing?

A data packet is being transmitted through a TCP/IP network. The original data payload is 1200 bits. The TCP header adds an additional 160 bits, and the IP header adds 120 bits. If this packet is then sent through a link with a data link layer that appends a 32-bit header, what is the total size of the packet (including data payload and all headers) in bits?

Which protocol is commonly used for secure communication over the Internet, providing encryption and authentication?