Network Terms

Question 1

What is a datagram?

Answer 1

A basic transfer unit. Provide connection-less communication. Transport layer (OSI layer 4).

Question 2

What is a channel?

Answer 2

Either the physical transmission medium (i.e a wire) or a logical connection over a multiplexed medium.

Question 3

What is a session?

Answer 3

A time-delimited two-way link. Enables information exchange between devices.

Question 4

What is a flow?

Answer 4

A sequence of packets.

Question 5

What is a packet?

Answer 5

A formatted unit of data. Consists of control information and user data. In OSI = PDU on network layer (layer 3)

Question 6

What is a frame?

Answer 6

A digital transmission unit. OSI layer 2 (data link)

Question 7

What is media access control and hop-by-hop?

Answer 7

Media access control: the layer that controls the hardware responsible for interaction with the transmission medium (data link)

hop-by-hop: principle for controlling the flow of data in a network. Chunks of data are forwarded from node to node. Involves the source and destination node as well as intermediate nodes.

Question 8

What is web server software?

Answer 8

Allows computers to act as web servers.

Question 9

What is PPP?

Answer 9

Point-to-Point Protocol. A data link layer communication protocol between two routers directly without any hosts or other networking in between.