M2Q8: Ethernet Flashcards
Module 2: Quiz 8
What is the IEEE standard for Ethernet?
A. 802.11
B. 802.3
C. 802.1q
D. 802.15
B. 802.3
Explanation: The IEEE 802.3 standard defines Ethernet. It was originally created in 1983 and defined 10Mbps over coaxial cable and CSMA/CD. Since then the standard has gone through multiple revisions now including over 55+ sub-standards. An example of a sub-standard is 802.3bm published in 2015 which defines 100G/40G Ethernet for optical fiber.
What is the maximum distance of Ethernet over Twisted Pair cabling?
A. 55 Meters
B. 100 Meters
C. 1000 Meters
D. There is no limitation
B. 100 Meters
Explanation: The maximum distance Ethernet is ever rated for over twisted pair cabling is 100 Meters. However, there are some forms of Ethernet that have a maximum distance of less than 100 Meters over twisted pair.
The payload of a standard Ethernet frame is how many Bytes?
A. 100
B. 1000
C. 9000
D. 1500
D. 1500
Explanation: The payload size of a standard Ethernet frame is 1500 Bytes. The payload contains all the data and the size of the frame can become larger than 1500 Bytes when the header and trailer information is added to it.
Network devices that are on the same Ethernet segment are also in the same _______________.
A. Collision domain
B. Carrier domain
C. Switching domain
D. Frame domain
A. Collision domain
Explanation: An Ethernet segment defines the scenario when devices are connected to the same bus or the same “piece of wire”. When devices are on the same segment their frames have the potential to collide with one another. Because of this we also say the devices are in the same collision domain.
Which part of Ethernet defines how devices know when to transmit on an Ethernet segment.
A. CSMA/CA
B. CSMA/CB
C. CSMA/CC
D. CSMA/CD
D. CSMA/CD
Explanation: CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is defined under the original Ethernet standard 802.3 and defines how nodes transmit on an Ethernet segment. With CSMA/CD nodes listen to the wire and only transmit when there is no signal present. If a collision is detected the node can retransmit.
Full Duplex communication is when a node can receive and transmit at the same time.
A. True
B. False
A. True
Explanation: Full Duplex means a node and both receive data and transmit data at the same exact time. Half Duplex means a node can only receive data or transmit data at any given time. Also, in order for a connection to function the Duplex (and the speed) must match on both sides of the Ethernet connection.
An Ethernet Hub separates collision domains.
A. True
B. False
B. False
Explanation: All devices connected to a Hub are on the same Ethernet segment and the same collision domain. Each Ethernet port/interface on a switch or router on the other hand is a separate Ethernet segment and separate collision domain. So Hubs do not separate collision domains, but switches and routers do.
What is the maximum data rate supported by Ethernet on Category 5e twisted pair cable?
A. 10 Mbps
B. 100 Mbps
C. 1000 Mbps
D. 10 Gbps
C. 1000 Mbps
Explanation: Regular Category 5 cable is rated up to only 100 Mbps, so Category 5e was created to allow for true 1000 Mbps (aka 1Gbps) connectivity up to 100 Meters. However, for the absolute best performance for 1Gbps Ethernet Category 6 cable should be used.
Which type of connector is used with standard twisted pair cables for Ethernet networks?
A. RJ11
B. RG58
C. RJ45
D. RG54
C. RJ45
Explanation: Registered Jack 45 (RJ45) is a copper pin connector for network cables and is mostcommonly used with Ethernet networks. Technically, RJ45 defines the jack specification which is the female end of the connection or the port. To connect to an RJ45 jack an 8P8C (eight position, eight contact) connector plug is used. In the industry, the 8P8C connector is also commonly referred to as an RJ45 connector. To work with Ethernet it must also be wired to the twisted pair cable in the standard pinout using T568-A and/or T568-B wiring standards.
To create a straight-through twisted pair cable a different TIA/EIA standard should be used on each
side of the cable.
A. True
B. False
B. False
Explanation: A straight-though cable should use the T568-B standard (aka TIA/EIA568-B) on both sides of the twisted pair cable. To create an Ethernet crossover on the other hand one would use the T568-A standard on one side and the T568-B standard on the other side.
Which Ethernet naming syntax defines Gigabit Ethernet up to 100 Meters over Cat5e or Cat 6 twisted pair cabling?
A. 1000BASE-T
B. 1GBASE-T
C. 1000BASE-SX
D. 100BASE-TX
A. 1000BASE-T
Explanation: 1000BASE-T defines 1000Mbps (which is the same as 1Gbps) over twisted pair. The term “Gigabit Ethernet” refers to 1000Mbps aka 1Gbps Ethernet.
If a device or Ethernet connection is rated for 100BASE-TX what is the maximum data rate (speed)?
A. 100Meters
B. 100Gbps
C. 100Kbps
D. 100Mbps
D. 100Mbps
Explanation: In the Ethernet naming syntax the first portion refers to the maximum data rate or Ethernet speed. In the case of 100BASE-TX it defines a 100Mbps connection over twisted pair cabling.
Which Ethernet naming syntax defines Gigabit Ethernet over multi-mode fiber optic cable?
A. 1000BASE-T
B. 1GBASE-T
C. 1000BASE-SX
D. 100BASE-TX
C. 1000BASE-SX
Explanation: 1000BASE-SX defines 1000Mbps (which is the same as 1 Gbps) over multi-mode fiber. The multi-mode fiber is defined by the “SX” notation which also is rated up to 550 meters.
Which Ethernet naming syntax defines 10 Gigabit Ethernet over single-mode up to 40 kilometers?
A. 1000BASE-LX
B. 10GBASE-SR
C. 10GBASE-EW
D. 10GBASE-ER
D. 10GBASE-ER
Explanation: 10GBASE-ER defines Ten Gigabit Ethernet over single-mode fiber optics up to 40 km. 1000BASE-LX is 1Gbps over single-mode up to 5 km. 10GBase-SR is 10Gbps over multi-mode up to 400m, and 10GBASE-EW is 10Gbps over single-mode up to 40km but for SONET networks only.
