CCENT Video 1 TS 6-11

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Anonymous
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89798
Filename:
CCENT Video 1 TS 6-11
Updated:
2011-06-08 10:48:16
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TrainSignal FlashCards
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TrainSignal Flash Cards
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  1. What are the 7 layers of the OSI Model?
    • 7. Application
    • 6. Presentation
    • 5. Session
    • 4. Transport
    • 3. Network
    • 2. Data Link
    • 1. Network
  2. Functions of the Application Layer 7
    • End user interacts with the network
    • Authentication happens at this layer
    • Ensures remote communication partner is available
    • Ensures needed communication resources exist (ie modem)
    • Both parties agree on procedures of data integrity, privacy and error recovery
  3. What device and application protocols run at Layer 7?
    • Firewalls
    • Email protocols ie SMTP and POP3
    • Telnet
    • HTTP
    • FTP File Transfer Protocl
    • SNMP Simple Network Managment Protocol
  4. Funcitions of Presentation Layer 6
    • Formats Data
    • Encrypts data
    • Compatability with operating system
    • Proper encapsulation of data for network transmission
  5. File types associated with Presentation Layer
    JPEG, MPEG, ASCII, and TIFF
  6. Functions of Session Layer 5
    • Manages 2 way communication between 2 remote hosts
    • Handles the creation, maintence and teardown of communications between 2 hosts
  7. Functions of the Transport Layer 4
    • Establishes a logical end-to-end connection between 2 systems
    • segments data received from the upper layers of the OSI model
    • Makes sure that data gets to the destination in the correct order and free of errors
  8. Two methods of transporting data
    Connection-oriented (TCP) and Connectionless (UDP)
  9. Functions of Network Layer 3
    • Runs IP at this layer
    • Routes at this layer (routers run at this layer)
    • Finds valid paths from local router to destination
    • Selects best path
  10. Devices that run at Data Link Layer 2
    • Switches run at this layer
    • Wireless Access Points (WAP) run at this layer
    • Modems and DSL run at this layer
    • HDLC
    • Ethernet
    • PPP Point-to-Point Protocol
    • Frame Relay
  11. Functions of Data Link Layer
    • Performs error detection (does not perform error recovery) using Frame Check Sequence
    • Also known as MAC address Layer
  12. Functions of Physical Layer 1
    • Translates 1s and 0s
    • Concerns itself with cabling, pins, connectors, voltages

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