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MCSE Guide
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MCSE : Security Specialist
Specify the main features, including speed,
access method, topology, and media of:
802.3 (Ethernet) Carrier Sense
Multiple Access with Collision Detection (CSMA/CD) LAN Ethernet
A
type of media access control. With CSMA/CD, a computer listens to
the network to determine whether another computer is transmitting a
data frame. If no other computer is transmitting, the computer can
then send its data. While the computer is listening for a data
signal, that would be the carrier sense part. Multiple access means,
there are multiple computers trying to access or send data on the
network at the same time. Collision detection indicates that the
computers are also listening for collisions, if two computers try to
send data at the same time and a collision occurs, they must wait a
random period of time before transmitting again.
Ethernet
Designation
|
Supported Media
|
Maximum Segment Length
|
Transfer Speed
|
Topology
|
10Base-5 |
Coaxial |
500 m |
10 Mbps |
Bus |
10Base-2 |
Thin Coaxial (RG-58 A/U) |
185 m |
10 Mbps |
Bus |
10Base-T |
Category 3 or above unshielded twisted-pair (UTP)
|
100 m |
10 Mbps |
Star, using either simple repeater hubs or Ethernet switches
|
1Base-5 |
Category 3 UTP, or above |
100 m |
1 Mbps |
Star, using simple repeater hubs |
10Broad-36 |
Coaxial (RG-58 A/U CATV type) |
3600 m |
10 Mbps |
Bus (often only point-to-point) |
10Base-FL |
Fiber-optic - two strands of multimode 62.5/125 fiber
|
2000 m (full-duplex) |
10 Mbps |
Star (often only point-to-point) |
100Base-TX |
Category 5 UTP |
100 m |
100 Mbps |
Star, using either simple repeater hubs or Ethernet switches
|
100Base-FX |
Fiber-optic - two strands of multimode 62.5/125 fiber
|
412 meters (Half-Duplex)
2000 m (full-duplex) |
100 Mbps
(200 Mb/s full-duplex mode) |
Star (often only point-to-point) |
1000Base-SX |
Fiber-optic - two strands of multimode 62.5/125 fiber
|
260 m |
1 Gbps |
Star, using buffered distributor hub (or point-to-point)
|
1000Base-LX |
Fiber-optic - two strands of multimode 62.5/125 fiber or
monomode fiber |
440 m (multimode) 5000 m (singlemode) |
1 Gbps |
Star, using buffered distributor hub (or point-to-point)
|
1000Base-CX |
Twinax, 150-Ohm-balanced, shielded, specialty cable
|
25 m |
1 Gbps |
Star (or point-to-point) |
1000Base-T |
Category 5 |
100 m |
1 Gbps |
Star |
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