Lesson 2A

Question 1

What is network data transmission?

Answer 1

It’s how data is sent over a network by changing electrical currents, light, or radio waves to represent digital bits (1s and 0s).

Question 2

What is frequency in network data transmission?

Answer 2

It’s the speed of the signals, measured in Hertz (Hz).

Question 3

What is bandwidth in network data transmission?

Answer 3

It’s the range of frequencies a medium can support, telling us how much data can be transferred, measured in bits per second (bps)

Question 4

What are the two main types of copper cables?

Answer 4

Twisted pair and coaxial (coax).

Question 5

What is attenuation?

Answer 5

It’s the weakening of a signal as it travels further through a cable.

Question 6

What are the two types of fiber optic cables?

Answer 6

Single Mode Fiber (SMF) and MultiMode Fiber (MMF).

Question 7

What does the xBASE-y naming convention represent in Ethernet standards?

Answer 7

x: The speed in Mbps or Gbps.
BASE: Baseband transmission.
y: The type of cable used.

Question 8

What is 10BASE-T?

Answer 8

An early Ethernet standard that works at 10 Mbps, uses baseband signals, and runs over twisted pair copper cables.

Question 9

What does 100BASE-TX refer to?

Answer 9

Fast Ethernet that works at 100 Mbps over Cat 5 (or better) twisted pair copper cables up to 100 meters long.

Question 10

Why are switches better than hubs in Ethernet networks?

Answer 10

Switches create separate collision domains for each port, support sending and receiving at the same time (full-duplex), and let each device use the full 100 Mbps.

Question 11

How is 100BASE-TX better than 10BASE-T?

Answer 11

It uses higher frequency signaling and better encoding to be 10 times faster.

Question 12

What does autonegotiation do in Fast Ethernet?

Answer 12

It helps devices choose the best connection speed (10 or 100 Mbps) and mode (half or full duplex)

Question 13

What is Media Access Control (MAC)?

Answer 13

It’s the system that decides when devices can send data and handles collisions on the network.

Question 14

What is a collision domain?

Answer 14

A part of the network where data packets can collide if two devices send data at the same time.

Question 15

What happens when a collision is detected in CSMA/CD?

Answer 15

The device sends a jam signal, then waits for a random time before trying to send data again.

Question 16

What is CSMA/CD?

Answer 16

A protocol that helps devices share the network and handle collisions.

Question 16

What is half-duplex transmission?

Answer 16

A mode where a device can either send or receive data, but not both at the same time.

Question 17

What is full-duplex transmission?

Answer 17

A mode where a device can send and receive data at the same time, which switches allow.

Question 18

Why don’t hubs work in Gigabit Ethernet?

Answer 18

Gigabit Ethernet only uses switches, which perform better and create separate collision domains.

Question 19

What is 10GBASE-T?

Answer 19

10 Gigabit Ethernet that works over Cat 6, Cat 6A, or Cat 7 cables with different maximum lengths.

Question 20

What is 1000BASE-T?

Answer 20

Gigabit Ethernet that works at 1 Gbps over Cat 5e or better copper cables up to 100 meters long.

Question 21

What is 40GBASE-T?

Answer 21

40 Gigabit Ethernet that uses Cat 8 cables with a maximum length of 30 meters (100 feet).