Term
|
Definition
| A name for the 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. IEEE standard 802.3ab. |
|
|
Term
|
Definition
| A name for the IEEE Fast Ethernet standard that uses two-pair copper cabling, a speed of 100 Mbps, and a maximum cable length of 100 meters. IEEE 802.3u |
|
|
Term
|
Definition
| The 10-Mbps baseband Ethernet specification using two twisted pairs of twisted-pair cabling (Categories 2, 4, 5); One pair transmits data and the other receives data. 10BASE-T has a distance limit of 100 meters. IEEE 802.3 |
|
|
Term
|
Definition
| An Ethernet cable that swaps the pair used for transmission on one device to a pair ised for receiving on the device on the opposite end of the cable. For 10BASE-T and 100 BASE-TX, pins 1,2 and 3,6 are swapped. |
|
|
Term
|
Definition
| Carrier Sensed Multiple Access Collision Detect. A media-access mechanism in which devices ready to transmit data first check the channel for a carrier. If no carrier is sensed for a specific period of time, a device can transmit. If two devices transmit at once, a collision occurs and it is detected by all colliding devices. This collision subsequently delays transmissions from those devices for some random length of time. |
|
|
Term
|
Definition
| Generically, any communication in which two communicating devices can concurrently send and receive data. CSMA/CD must be disable for this on Ethernet LANs. |
|
|
Term
|
Definition
| Generically, any communication in which only one devices at a time can send data. In Ethernet LANs, the normal result of the CSMA/CD algorithm that enforces the rule that only one device should send at any point in time. |
|
|
Term
|
Definition
| A LAN device that provides a centralized connection point for LAN cabling, repeating any received electrical signal out all other ports, thereby creating a logical bus. Hubs do not interpret the electrical signals as a frame of bits, so hubs are considered to be Layer 1 devices. |
|
|
Term
|
Definition
| The documentation and implementation of which wires inside a cable connect to each pin position in any connector. |
|
|
Term
Define:
Protocol Type field |
|
Definition
| A field in a LAN header that identifies the type of header that follows the LAN header. Includes the DIX Ethernet Type field, the IEEE 802.2 DSAP field, and the SNAP protocol Type field. |
|
|
Term
|
Definition
| An Ethernet that uses a hub, or even the original coaxial cabling, which results in the devices having to take turns sending data, sharing the available bandwidth. |
|
|
Term
Define:
Straight-through cable |
|
Definition
| In Ethernet, a cable that connects the wire on pin 1 on the end of the cable to pin 1 on the other end of the cable, pin 2 on one end to pin 2 one the other, and so on. |
|
|
Term
|
Definition
| A network device that filters, forwards, and floods Ethernet frames based on the destination address of each frame. |
|
|
Term
|
Definition
| An Ethernet that uses a switch, and particularly not a hub, so that the devices connected to one switch port do not have to contend to use the bandwidth available on another port. Bandwidth is not shared across all devices on the network. |
|
|
Term
|
Definition
| Transmission medium consisting of two insulated wires, with the wires twisted around each other in a spiral. An electrical circuit flows over the wire pair, with the current in opposite directions on each wire, which significantly reduces the interference between the two wires. |
|
|
Term
List:
Gigabit Ethernet speed, Alternative name, IEEE standard, Cable type and length. |
|
Definition
1000 Mbps
IEEE 302.3z
1000 BASE-SX, 550m
1000 BASE-LX, 5 km
FIber |
|
|
Term
|
Definition
1. Listens until the Ethernet is not busy.
2. When Ethernet is not busy, the sender being sending the frame.
3. Sender listens to make sure no collision occurred.
4. If collision occurs, the devies that had been sending frames each send a jamming signal to ensure all stations recognize the collision.
5. After the jamming is complete, each sender randomizes a timer and waits that long before trying to resend the collided data.
6. When the timer expires, the process begins again. |
|
|
Term
List:
Devices that Transmit on 1,2 and Receive on 3,6 |
|
Definition
PC NICs
Routers
Wireless Access Points
Network printers |
|
|
Term
List:
Devices that transmit on 3,6 and receive on 1,2 |
|
Definition
|
|
Term
Describe:
Structure of Unicast Ethernet address |
|
Definition
| An OUI (Organizationally Unique Identifier), which is the first 24 bits or 6 Hex digits, is followed by 24 bits or 6 hex digits that are vendor assigned. |
|
|
Term
|
Definition
| Media Access Control. 802.3 (Ethernet) defines the MAC sublayer of IEEE Ethernet. |
|
|
Term
Define:
Ethernet address, NIC address, LAN address |
|
Definition
| Other names often used instead of MAC address. These terms describe the 6-byte address of the LAN interface card. |
|
|
Term
|
Definition
| The 6-byte address assigned by the vendor making the card. |
|
|
Term
|
Definition
| A term for a MAC that represents a single LAN interface. |
|
|
Term
|
Definition
| An address that means "all devices that reside on this LAN right now." |
|
|
Term
|
Definition
| On Ethernet, a multicast address implies some subset of all the devices currently on the Ethernet LAN. |
|
|
