Chapter 3: Ethernet LAN's Flashcards
Definition
—-100BASE-TX—-
- IEEE Fast Ethernet standard that use 2-pair copper cabling.
- Speed of 100Mbps
- Maximum cable length of 100 meters
Definition
—-1000BASE-T—-
- IEEE Gigabit Ethernet Standard that uses 4 pair copper cabling.
- Speed of 1000 MBS (1 Gbps).
- Maximum cable length of 100 meters.
Definition
—-10BASE-T—-
- 10Mbps Ethernet standard using 2-pair twisted cabling (CATegory 3, 4, or 5)
- One pair sends and the other receives
- Maximum cable length of 100 meters (328 ft) per segment
Definition
—-Crossover Cable—-
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 (10BASE-T & 100BASE-TX 1 & 2 are swapped with 3 & 6)
CSMA/CD
- Carrier Sense Multiple Access Collision Detect
- A media-access device in which devices ready to transmit data first check the channel for a carrier.
- –No carrier sensed for a specific period of time, a device can transmit.
- –if 2 devices transmit at the same time a collision occurs & is detected by all colliding devices.
- –this collision subsequently delays retransmission from those devices for a random length of time.
Full Duplex
When a communication device can send & receive concurrently. Ethernet LAN’s - both devices must have their CSMA/CD logic disabled.
Half Duplex
Communication in which only one device can send data at a time.
Ethernet LAN’s - the normal result of CSMA/CD logic rules that allow only one device should send at any point in time.
Hub
A Layer 1 device (does not interpret electrical signals as frames of bits) that provides a centralized point for LAN cabling, repeating any electrical signal out all other ports, thereby creating a logical bus.
Pinout
Documentation & implementation of which wires inside a cable connect to each pin position in any connector.
Protocol Type
A field in a LAN Header that identifies the type of Header that follows the LAN Header.
- –DIX Ethernet Type Field
- –IEEE 802.2 DSAP Field
- –SNAP Protocol Type Field
Shared Ethernet
An Ethernet that uses a hub, or coax cabling, resulting in the devices having to take turns sending data, sharing the available bandwidth.
Switched Ethernet
An Ethernet that uses a switch, not a hub, so that devices connected to one switch port do not contend for bandwidth with devices connected to another switch port.
–opposite of shared Ethernet & much faster
Straight-Through Cable
In Ethernet, a cable that connects the wire on pin one on one end to pin one on the other end, pin 2 to pin 2, etc…
Switch
An Ethernet device that filters, forwards, and floods Ethernet frames, based on the destination address of each frame.
Twisted Pair
A transmission medium consisting of two insulated 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 reduces interference b/w the two wires.
