2a - LAN Technologies

Question 1

A layer 1 device that repeats the frame down every network cable connected to it.

Answer 1

Hub

Question 2

A layer 2 device that can either be hardware or software based; makes filtering/forward decisions.

Answer 2

Bridge

Question 3

Physically connects devices together on a LAN;
Classified as layer 2 devices because they also make forwarding/filtering decisions based on MAC addresses;
Can support full-duplex data transfer.

Answer 3

Switch

Question 4

A layer 3 device that makes its forwarding (routing) decisions based on IP addresses.

Answer 4

Router

Question 5

Standard for bridging and management;
Handles the architecture, security, management, and internetworking of LANs, MANs, and WANs.

Answer 5

IEEE 802.1

Question 6

Standard for CSMA/CD and defining Ethernet specifications;
Specifies the physical media and working characteristics of Ethernet.

Answer 6

IEEE 802.3

Question 7

CSMA/CD

Answer 7

A set of rules determining how network devices access network media. Also defines how devices should respond when two devices attempt to use a data channel simultaneously.

Question 8

Carrier sense

Answer 8

An ongoing of activity of a data station to detect whether another station is transmitting.

Question 9

Multiple access

Answer 9

Occurs when all machines have equal access to the wire.

Question 10

When two or more devices attempt to access the same media at the same time.

Answer 10

Collision;
Data collides and becomes corrupted.

Question 11

Collision detection

Answer 11

Both devices back off and wait a random amount of time before retrying.

Question 12

Exponential backoff

Answer 12

Random wait times increase systematically to further prevent collision.