CCNA 200-301 Chapter 2 (Fundamentals of Ethernet LANS)
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27 Terms
10BASE-T
10-Mbps Ethernet using two pairs of UTP cables
Max range 100m
Ethernet
A series of LAN standards defined by the IEEE
IEEE
Institute of Electrical and Electronics Engineers. A professional organization that develops communications and network standards, among other activities.
Wired LAN
LAN that uses Ethernet or Fiber Cables
Ethernet Frame
Ethernet data-link header/trailer + the packet inside
100BASE-T
100-Mbps Ethernet using two pairs of UTP cables
Max range 100m
1000BASE-T
1-Gbps Ethernet using four pairs of UTP cables
Max range 100m
Fast Ethernet
100 Mbps
Gigabit Ethernet
1 Gbps
Ethernet Link
A physical link between two Ethernet nodes.
RJ-45
Ethernet plug
Ethernet Port
A NIC that uses RJ-45 connectors
Network Interface Card (NIC)
The port on a device that allows it to connect to the Network
Straight Through Cable
Normal Ethernet cable.
Pins 1 & 2 connected to pins 1 & 2 on the other side.
Crossover Cable
UTP RJ-45 cable that connects pins 1 & 2 to pins 3 & 6 on the other side. Used to connect similar devices together such as two routers.
Ethernet Address
Synonymous with MAC Address
MAC Address
12 Hexadecimal (48 bit) number that uniquely identifies a device.
First 3 bytes are the Organizational Unique ID (OUI)
Last 3 bytes are the Vendor Assigned Address
Unicast Address
Synonymous with MAC Address
Broadcast Address
Address that represents all devices in a LAN. All binary 1's or F's in Hex.
Frame Check Sequence
Field in the data link trailer used for error-detection.
Transceiver
A device that transmits and receives signals.
Multimode Fiber
Uses LEDs to transmit light and uses a larger core.
More expensive.
Singlemode Fiber
Uses Lasers to transmit light and uses a small core.
Travels farther distances.
Electromagnetic Interference (EMI)
When electricity from one wire disturbs the signal on another.
Core
The center fiberglass cylinder of a fiber-optic cable through which light passes.
Cladding
The second layer of a Fiber-Optic cable that surrounds the core of the cable. Reflects light back onto the core.
Fiber-Optic Cable
A type of cable that uses fiber as a medium to transmit light