Repeaters & Hubs, Bridges, Switches

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Repeaters & Hubs, Bridges, Switches
2013-08-20 16:37:33
Repeaters Hubs

Repeaters & Hubs
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  1. What does a repeater do?
    Takes an incoming signal and then generates a new, clean copy of the exact signal. This prevents maximum cable lengths from stopping transmissions.
  2. The gradual weakening of an electric signal as it travels is called what?
  3. This device is basically the same as a repeater but will have more ports.
  4. Hubs & repeaters operate at what layer of the OSI model?
    Physical-Layer 1
  5. What is the meaning of a collision domain?
    That data that one host sends can collide with data sent by another host. Which results in all data involved in the collision becoming unusable
  6. To prevent collision on a shared ethernet segment what does the host do?
    Use CSMA/CD ( Carrier Sense Multiple Access with Collision Detection)
  7. What is the Process of CSMA/CD?
    • 1. host "listen to wire"-checks ┬áthe shared media to see if its in use
    • 2.If in use waits a few milliseconds before checking again
    • 3.If not in use, the host sens the data
    • 4.If 2 PCs send data at the same time. The voltage will drop on the wire. indicating to the hose a collision.
    • 5.The host that sent the data will generate a "jam signal" which indicated to the other hose on the shared media not to send data to a collision.
    • 6.Those two PC's invoke a backoff timer, in milliseconds. When each random host timer expires they will each begin the process again by listening to the wire.
  8. Every single time a PC sends a broadcast, every other PC in the broadcast domain is going to receive a copy of it even they don't want it or not? T or F
  9. What is a bridge used for?
    It is use to create more then one Collision Domain by being placed in between multiple repeaters or hubs
  10. Bridges help lower the number of broadcasts? T or F
    F Every single hose on the network will receive a copy of that broadcast.
  11. Each host on its on switch port, gives each host its own?
    Collision Domain
  12. When each host is connected to its own switch port, the host no longer has to share bandwith? T or F
    T Each host can run 200 MBPS - 100 MBPS sending and 100 MB
  13. What does Cisco Switches not do by default?
    Break up Broadcast domains
  14. Hubs only allow one host to transmit at a time? T or F
    T. Switches allow host to transmit simultaneously
  15. On a switch how do you cut down on your brodcast?
    Setting up Vlans
  16. What is Micro-segmentation?
    One host, One collision domain