MindMap Gallery Basic principles of LAN
This is a mind map about the basic principles of local area networks. It describes and summarizes the basic principles of local area networks in detail. It is clear and easy to understand, which is helpful for quickly mastering knowledge points.
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Basic principles of LAN
Protocols and cables used
physical layer
twisted pair
coaxial cable
optical fiber
radio
data link layer
Ethernet
the only de facto standard
Token Ring
disuse
FDDI
Light distribution interface
disuse
Network layer
IP
the only de facto standard
IPX
disuse
Apple talk
disuse
LAN equipment
hub
Internal bus topology
low efficiency
Only one host can occupy the bus at any time, and all connected devices are in the same collision domain.
Works at the physical layer, has no addressing capabilities, and all data is forwarded by flooding.
switch
Each two internal interfaces have independent lines, and each interface is an independent collision domain.
Works at the data link layer
conflict domain
Device sending data creates conflicting network range
All interfaces of the hub are in the same collision domain
Each interface of the switch is an independent collision domain
CSMA/CD
Carrier Sense Multiple Access with Collision Detection
LAN cable
twisted pair
linear
direct line
heterogeneous direct connection
The line sequence at both ends is consistent
crosshatch
homogeneous crossover
The line sequence at both ends is inconsistent
Line order
T568A
white green, green, white orange, blue, white blue, orange, white brown, brown
T568B
white orange, orange, white green, blue, white blue, green, white brown, brown
Interface Type
RJ-45
RJ-11
optical fiber
multimode optical fiber
The fiber core is thicker and can transmit a variety of light sources
Short transmission distance
low cost
single mode fiber
The fiber core is thin and can only transmit a single light source
Long transmission distance
high cost