Networking 4 Flashcards
can be a wired connection using a cable or a wireless connection using radio waves.
physical connection
The physical layer standards address three functional areas:
- Physical Components
- Encoding
- Signaling
are the electronic hardware devices, media, and other connectors that transmit the signals that represent the bits
Physical Components
line encoding is a method of converting a stream of data bits into a predefined “code”
encoding
The physical layer must generate the electrical, optical, or wireless signals that represent the “1” and “0” on the media. The way that bits are represented
signaling
capacity at which a medium can carry data
bandwidth
amount of time, including delays, for data to travel from one given point to another
latency
measure of the transfer of bits across the media over a given period of time.
throughput
is the measure of usable data transferred over a given period of time.
goodput
can distort and corrupt the data signals being carried by copper media. Potential sources of EMI and RFI include radio waves and electromagnetic devices, such as fluorescent lights or electric motors.
Electromagnetic interference (EMI) or radio frequency interference (RFI)
disturbance caused by the electric or magnetic fields of a signal on one wire to the signal in an adjacent wire
crosstalk
interconnecting network hosts with intermediary networking devices, such as switches and routers.
Unshielded twisted-pair (UTP)
provides noise protection
Shielded twisted-pair (STP)
- conforms to the standards established jointly by the TIA/EIA
- Cables in higher categories are designed and constructed to support higher data rate
UTP cabling
The most common type of networking cable. It is commonly used to interconnect a host to a switch and a switch to a router.
Ethernet Straight-through
