Ethernet LANs Flashcards
Refers to LAN standards that define the physical and data link layers used by the popular wired technologies.
Ethernet
Fast Ethernet Speed
100Base T
1 Gbps fiber
1000Base LX
Gigabit Ethernet
1000BaseT
- 3
- 3a
- 3ab
- 3z
- 3an
Eth Fast Eth Gig Eth GIg Eth fiber 10Gig eth
Connect pins on one to the same pins on the other side
Straight through cables
Device that would use crossover with Hub
switch
Devices that would use a crossover with PC NIC
WAP, Router
crossover pairs
1,2->3,6
crossover pairs for 1000 Base T
4,5 ->7,8
Fiber uses LED source
multimode
Fiber uses LASER
singlemode
Copper wire distance
100m
FIber distance 100 BAse LX
5000m
Less expensive and improves max distances over UTP
Multimode
UTP Cost of cabling
Cost of switchport
Low
Low
MM Cost of cabling
cost of switchport
Med
Med
SM COst of cabling
cost of switchport
Med
High
UTP max distance
100m
MM max distance
500m
SM MAX distance
40km
Has some risk of intereference and copying cable emiisions
UTP
Ethernet Headers
Preamble 7 Start frame delimiter 1 Dest Mac 6 Src mac 6 Type 2 Data 46-1500 FCS 4
Half Duplex
Cannot transmit and receive at the same time.
Full Duplex
Device can send and receive at the same time
Use CSMA/CD, Half-duplex
LAN Hubs
Ethernet shared media
refers to designs that use hubs
Ethernet point to point
where each link works independently of the others
Light reflects of this in fiber
cladding
Used for error detectiion in ethernet trailer
Frame Check Sequence