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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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