Chapter 2 - Ethernet LANs

Question 1

Ethernet

Answer 1

A series of LAN standards defined by the IEEE, originally invented by Xerox Corporation and developed jointly by Xerox, Intel, and Digital Equipment Corporation.

Question 2

IEEE

Answer 2

Institute of Electrical and Electronics Engineers. A professional organization that develops communications and networking standards, among other activities.

Question 3

Wired LAN

Answer 3

(LAN) that physically transmits bits using cables

Question 4

Wireless LAN

Answer 4

(LAN) that physically transmits bits using radio waves.

Question 5

Ethernet Frame

Answer 5

Ethernet data-link header and trailer, plus the data encapsulated between the header and trailer.

Question 6

10BASE-T

Answer 6

10-Mbps two pairs of twisted-pair cabling (Categories 3, 4, or 5): IEEE 802.3 100 m (328 feet) per segment.

Question 7

100BASE-T

Answer 7

IEEE Fast Ethernet standard that uses two-pair copper cabling, a speed of 100 Mbps, and a maximum cable length of 100 meters.

Question 8

1000BASE-T

Answer 8

IEEE Gigabit Ethernet standard that uses four-pair copper cabling, a speed of 1000 Mbps (1 Gbps), and a maximum cable length of 100 meters.

Question 9

Fast Ethernet

Answer 9

IEEE standards that send data at 100 megabits per second.

Question 10

Gigabit Ethernet

Answer 10

IEEE standards that send data at 1 gigabit per second.

Question 11

Ethernet Link

Answer 11

Physical link between two Ethernet nodes, no matter what type of cabling is used.

Question 12

RJ-45

Answer 12

Cabling connector used for Ethernet cabling. RJ-45 allows the connection of eight wires.

Question 13

Ethernet Port

Answer 13

Ethernet NIC or LAN switch, into which an Ethernet cable can be connected.

Question 14

Networking Interface Card (NIC)

Answer 14

Provides the electronics and other functions to connect to a computer network. Today, most NICs are specifically Ethernet NICs, and most have an RJ-45 port, the most common type of Ethernet port.

Question 15

Straight-Through Cable

Answer 15

Pin 1 on one end of the cable to pin 1 on the other end of the cable, pin 2 on one end to pin 2 on the other end, and so on.

Question 16

Crossover Cable

Answer 16

In 10BASE-T and 100BASE-TX networks, this cable swaps the pair at pins 1,2 to pins 3,6 on the other end of the cable, and the pair at pins 3,6 to pins 1,2 as well.

Question 17

Ethernet Address

Answer 17

A 48-bit (6-byte) binary number, usually written as a 12-digit hexadecimal number, used to identify Ethernet nodes (destination/source addresses) in an Ethernet network.

Question 18

MAC Address

Answer 18

Data-link layer address that is required for every device that connects to a LAN. Ethernet MAC addresses are 6 bytes long and are controlled by the IEEE. Also known as a hardware address, a MAC layer address, and a physical address.

Question 19

Unicast Address

Answer 19

Address in networking that represents a single device or interface, instead of a group of addresses (as would be represented by a multicast or broadcast address).

Question 20

Broadcast Address

Answer 20

Address that represents all devices, and can be used to send one message to all devices. In Ethernet, the MAC address of all binary 1s, or FFFF.FFFF.FFFF in hex.

Question 21

Frame Check Sequence

Answer 21

A field in many data-link trailers used as part of the error-detection process.

Question 22

Transceiver

Answer 22

transmitter and receiver. process received energy signals to interpret as a series of 1s and 0s.

Question 23

Multimode Fiber (MM)

Answer 23

Fiber cable - LEDs that emit multiple angles of light into the core of the cable

Question 24

Single-Mode Fiber (SM)

Answer 24

Fiber cable - lasers that emit a single angle of light into the core of the cable

Question 25

Electromagnetic Interference (EMI)

Answer 25

Interfering with the use of electricity to transmit data on the second cable.

Question 26

Core

Answer 26

In fiber-optic cabling, the center cylinder of the cable, made of fiberglass, through which light passes.

Question 27

Cladding

Answer 27

In fiber-optic cabling, the second layer of the cable, surrounding the core of the cable, with the property of reflecting light back into the core.

Question 28

Fiber-Optic Cable

Answer 28

A type of cabling that uses glass fiber as a medium through which to transmit light.