ssd2 / Exam 3 Practical / 1

1. Packets

1. What is a packet?

A packet is the smallest unit of data that is sent over a network.

2. What is a packet collision?

A packet collision is when two packets of data are sent on the same network cable at the same time. The packets "collide" and corrupt the data that is being sent; the data is lost and must be resent.

3. Describe the function of simplex (comment on collision rates).

Simplex communication is monodirectional . The is one sending unit, and at least one receiving unit. As television station is an example of simplex communication.There are no collisions in simplex communication.

4. Describe the function of half-duplex (comment on collision rates).

Half-duplex communication is a bidirectional form of communication, in which any given point (system) can either send or receive data at any given time, but not do both. CB radio is an example of half-duplex communication.Half-duplex communication may have collisions.

5. Describe the function of full-duplex (comment on collision rates).

Full-duplex communications allows any device to both send and receive data at the same time. A telephone is an example of full-duplex communication.There are no collisions in full-duplex communication.