Unit 1 Set 2 Terms

Question 1

Ethernet frame

Answer 1

A term referring to an Ethernet data-link header and trailer, plus the data encapsulated between the header and trailer.

Question 2

10BASE-T

Answer 2

The 10-Mbps baseband Ethernet specification using two pairs of twisted-pair cabling (Cat 3, 4, or 5): one pair transmits data and the other pair receives data. 10BASE-T, which is part of the IEEE 802.3 specs, has a distance limit of aprox 100m per segment.

Question 3

100BASE-T

Answer 3

A name for the IEEE Fast Ethernet standard that uses two-pair copper cabling, a speed of 100 Mbps, and a max cable length of 100m

Question 4

1000BASE-T

Answer 4

A name for the IEEE Fast Ethernet standard that uses two-pair copper cabling, a speed of 1000 Mbps, and a maximum length of 100m

• 802.3ab

Question 5

Fast Ethernet

Answer 5

The common name for all the IEE standards that send data at 100mbps

Question 6

Gigabit Ethernet

Answer 6

The common name for all the IEE standards that send data at 1000mbps

Question 7

Ethernet Link

Answer 7

A generic term for any physical link between two Ethernet nodes, no matter what type of cabling is used

Question 8

straight-through cable

Answer 8

In Ethernet, a cable that connects the wire on pin 1 on one end of the cable to pin 1 on the other end of the cable, pin 2 to pin and so on.

Question 9

crossover cable

Answer 9

An Ethernet cable that swaps the pair used for transmission on one device to a pair used for receiving on the device on the opposite end of the cable. 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 10

Ethernet address

Answer 10

A 48-bit (6-byte) binary number, usually written as a 12-digit hexadecimal number, used to identify Ethernet nodes in an Ethernet network.
Ethernet frame headers list a destination and source address field, used by the Ethernet devices to deliver Ethernet frams to the correct destination.

Question 11

MAC address

Answer 11

A standardized 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 12

unicast address

Answer 12

Generally, any 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 13

broadcast address

Answer 13

Generally, any 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. For IPv4, see subnet broadcast address.

Question 14

Frame Check Sequence

Answer 14

A field in many data-link trailers used as part of the errordetection process

Question 15

Transceiver

Answer 15

A field in many data-link trailers used as part of the errordetection process

Question 16

multimode fiber

Answer 16

A type of fiber cable that works well with transmitters like LEDs that emit multiple angles of light into the core of the cable; to accommodate the multiple angles of incident, the cable has a larger core in comparison to single-mode fiber cables/

Question 17

single-mode fiber

Answer 17

A type of fiber cable that works well with transmitters like lasers that emit a single angle of light into the core of the cable, allowing for a smaller core in comparison to multimode fiber cables

Question 18

EMI

Answer 18

The name of the effect in which electricity passes through one cable as normal, inducing a magnetic field outside the conductor. That magnetic field, if it passes through another conductor, like a nearby cable, induces new electrical current in the second cable, interfering with the use of the electricity to transmit data on the second cable.

Question 19

1000BASE-LX

Answer 19

(Gigabit Ethernet)

• 802.3z
• Fiber, 5000m

Question 20

10GBASE-T

Answer 20

• Copper
• 100m
• 802.3an