CCENT

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Author:
3nails
ID:
227105
Filename:
CCENT
Updated:
2013-07-15 21:29:35
Tags:
OSI Model
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Description:
Layers
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  1. OSI Model
    · Helps “break down” network functions

    · Creates standards for equipment manufacturing

    · Allows vendors to focus in specialized areas of the network
  2. What layer defines the electrical, optical, cabling, connectors, and procedural details required for transmitting bits, represented as some form of energy passing over a physical medium?
    Physical Layer (Layer 1)
  3. What layer formats data into frames appropriate for transmission onto some physical medium.
    Defines rules for when the medium can be used.
    Defines means by which to recognize transmission errors?
    Data Link Layer (Layer 2)
  4. What layer handles logical addressing, routing, and path determination?
    Network Layer (Layer 3)
  5. What layer provides a variety of services between 2 host computers, including connection establishment and termination, flow control,error recovery, and segmentation of large data blocks into smaller parts for transmission?
    Transport Layer (Layer 4)
  6. What layer establishes and maintains end-to-end bidirectional flows between endpoints, as well as includes managing transaction flows?
    Session Layer (Layer 5)
  7. What layer defines the format and organization of data, as well as includes encryption?
    Presentation Layer (Layer 6)
  8. What layer interfaces between network and application software, and also includes authentication services?
    Application Layer (Layer 7)
  9. Application (Layer 7)
    -Interfaces with the application

    -Provides network access to apps
  10. Presentation (Layer 6)
    -"Generi-Fies" the data

    -Encryption Services
  11. Session (Layer 5)
    -Starts and ends sessions

    -Logically keeps sessions seperate
  12. Transport (Layer 4)
    -Dictates "how" the data is sent (TCP-reliable) or (UDP-unreliable)

    -Defines well-known services (ports)
  13. Network (Layer 3)
    -Provides "logical" addressing (IP address)

    -Finds best path to a destination
  14. Data Link (Layer 2)
    -Provides "physical" addressing (MAC address)

    -Ensures data is error-free
  15. Physical (Layer 1)
    -Provides access to the cable

    -Electrical signals, 1's and 0's
  16. bianary - 128  64   32   16    8    4     2    1
    Subnet - 128 192 224 240 248 252 254 255
    #of hosts- 256 128 64 32 16 8 4 2 -2
    #of bits- 25 26 27 28 29 30 31 32
    • this is for class C. The only differences between C , A and B wouldbe the number of hosts and number of bits.
    • 12345678 . 9 10 11 12 13 14 15 16 . 17 18 19 20 21 22 23 24 . 25 26 27 28 29 30 31 32

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