In a TCP/IP network, which layers are basically absent?

What are PPP and SLIP most commonly used for?

What is the speed of a E1 line?

At which layer of the OSI model, does SMTP (Simple Mail Transfer Protocol) operate?

What do you call a medium which only allows a single channel?

According to the OSI model, at which layer are network addresses assigned?

Http is an example of a(n) ______ layer protocol.

Four-pair utp uses ________ connectors.

Facebook has more than ________ users worldwide.

Ethernet standards are specified at the ________ layer.

Ethernet is easy to ____.