Basic Catalyst Switch Operations and Configurations

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Author:
gbird
ID:
190655
Filename:
Basic Catalyst Switch Operations and Configurations
Updated:
2012-12-27 02:37:11
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Operations Configurations
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Description:
Operations and Configurations
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  1. What devices are used to segment collision domains?
    Bridges and switches
  2. Which device isolates one collision domain from another while still connecting them and selectively allowing frames to passfrom one to the other?
    A Bridge
  3. What three things must a switch do that seperates it from being a bridge?
    • address learning
    • frame forwarding
    • layer 2 loop removal.
  4. What refers to the intelligent capability of switches to dynamically learn the source MAC addresses of devices that are connected to its various ports?
    Address learning
  5. Where does a switch store its MAC table?
    RAM
  6. Which device always sends all frames out all ports except the one it came in on?
    a hub
  7. Do Switches segment broadcast domains?
    no
  8. What will a switch do with a frame if it does not have an entry in its MAC table for the destination MAC in the frame?
    flood the frame except the port for which the frame was received on.
  9. What does a switch do after it floods a frame for an unknown destination address?
    after the destination host responds to that first frame, the switch will enter the missing MAC address into its table.
  10. What does a switch do with a frame where the source and destination addresses are on the same port?
    The switch does not transmit the frame out any ports and assumes that the frame will reach its intended recipient without help from the switch.
  11. How does a switch handle a broadcast frame?
    It floods the frame except the port for which the frame was received.
  12. What kind of switching technology does a switch use?
    ASIC (hardware)
  13. What kind of switching technology does a hub use?
    Software
  14. Is a switch considered fast or slow in terms of speed?
    fast
  15. Is a hub considered fast or slow in terms of speed?
    slow
  16. Does a switch have High Port Density or Low Port Density?
    High
  17. Does a hub have High Port Density or Low Port Density?
    low
  18. What kind of duplex does a switch have?
    Full and Half
  19. What kind of duplex does a hub have?
    half only
  20. Is a switch VLAN-aware?
    Yes
  21. Is a hub VLAN-aware?
    no
  22. How many collision domains does a switch have?
    1 per port
  23. How many collision domains does a hub have?
    1 per port
  24. How many broadcast domains does a switch have?
    1 per VLAN
  25. How many broadcast domains does a hub have?
    1
  26. How many STP instances does a switch have?
    1 per VLAN
  27. How many STP instances does a hub have?
    1
  28. What are the three switching modes?
    • Store and Forward
    • Cut Through
    • Fragment Free
  29. What is the basic switching mode that switches and hubs use?
    Store and Forward
  30. What is the only switching mode that hubs use?
    Store and forward
  31. How does the Store and Forward switching mode treat frames?
    • The entire frame is buffered (copied into memory)
    • The Cyclic Redundancy Check (CRC), also knownas the FCS or Frame Check Sequence is run to ensure that the frame is valid and not corrupted.
  32. Which switching mode is the fastest?
    Cut Through
  33. How does the Cut Through switching mode handle frames?
    The switch analyzes the first six bytes of the destination MAC to make its forwarding decision.
  34. Is CRC used in the Cut Through switching mode?
    no
  35. What is the disadvantage in using cut through switching modes?
    bad frames will be switched along with the good.
  36. Which switching mode is a switching method that picks a compromise between the reliability of Store and Forward and the speed of Cut Through.
    Fragment-Free
  37. How does a switch handle a frame when configured for Fragment free switching mode?
    • it buffers the first 64 bytes of each frame
    • updates the source MAC and port if necessary
    • reads the destination MAC
    • forwards the frame
  38. In fragment free switching mode, what happens to the frames that are less than 64 bytes?
    They are discarded
  39. What are frames called that are less than 64 bytes?
    runts
  40. What is a nick name for fragment free switching mode?
    runtless
  41. What is the sequence of commands used to configure a switch port to use full duplex?
    • config terminal
    • interface fastethernet 0/1
    • duplex full
    • speed 100
  42. What is the sequence of commands used to configure a switch port to use half duplex?
    • config terminal
    • interface fastethernet 0/1
    • duplex half
    • speed 10
  43. What is the sequence of commands used to configure a switch port to use auto duplex?
    • config terminal
    • interface fastethernet 0/1
    • duplex auto
    • speed auto
  44. What is the default duplex configuration for a switch?
    auto
  45. What protocol functions as the Layer-2 loop removal?
    Spanning Tree Protocol (STP)
  46. What terminology is used to define two or more switchesthat are interconnected by two or more physical links?
    A loop
  47. What 3 problems do Switching loops create?
    • Broadcaststorms
    • MAC table instability
    • Duplicate frames
  48. Who originally developed STP?
    Digital Equipment Corporation (DEC)

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