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What are the 7 layers of the OSI model?
- 7. Application
- 6. Presentation
- 5. Session
- 4. Transport
- 3. Network
- 2. Data Link
- 1. Physical
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What are 3 characteristics of the Physical layer in the OSI model?
- 1. Hubs
- 2. Repeaters
- 3. Cables
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What are 3 characteristics of the Data Link Layer of the OSI model?
- 1. Bridges
- 2. Switches
- 3. MAC address
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Give two main characteristics to remember of the Network layer of the OSI model?
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What OSI model layer uses TCP, UDP and delivers communications between nodes?
Layer 4: Transport
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If you manage communications, for example server to client, what OSI model layer would you refer to?
Layer 5: Session
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True or False: The Presentation Layer of the OSI Model is responsible for coding JPEG and GIF.
True
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What layer refers to the user interface serving as applications outside the model, for example FTP?
Layer 7: Application
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What does OSI Model stand for?
Open System Interconnection Model.
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To help remind us of the 7-Layer OSI model, one might use this word association as....
All People Seem To Need Digital Phones
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What does De-encapsulation do to a packet?
Removes the Header and Footer.
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What is UDP?
User Datagram Protocol
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Define protocol.
A protocol is a controlled sequence of messages that are exchanged between two or more systems to accomplish a given task.
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What does PPP stand for?
Point to Point protocol
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What does FDDI stand for?
Fiber Distributed Interface
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What does TCP/IP stand for?
Transmission Control Protocol/Internet Protocol
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What does IPX/SPX stand for?
Internet Packet Exchange/Sequence Packet Exchange
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What does NetBeui stand for?
Network Base Input/Output...PC Network Protocol
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What does HTTP stand for?
Hypertext Transfer Protocol (Web Browser for WWW)
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What does IRC stand for?
Internet Relay Chat (text messaging)
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What does SMTP stand for?
Simple Mail Transfer Protocol
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What does FTP stand for?
File Transfer Protocol
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What does TEP stand for?
Terminal Emmulation Protocol
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What does LPR stand for?
Line Printer Protocol (sends jobs to printer)
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What does NFS stand for?
Network File System (protocol access files to and from the network).
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Explain spread spectrum.
To combine two tone frequencies to create a third frequency.
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What does BER stand for?
Bit Error Rate
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What does UART stand for?
Universal Asychronance Receive Transmit
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What does BPF stand for?
Ban Pass Filter
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What does FSK stand for?
Frequency Shift Key
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Name 6 characteristics of a cable modem.
- 1. Always connected
- 2. QAM (modulation phase)
- 3. Compression
- 4. Noiseless Technology
- 5. Higher Clock Frequency
- 6. Error Detection/correction technology
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What is the distance requirement for ADSL?
9,000 - 18,000 feet from the Central Office
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What is the function of a DSL filter?
To separate low analog from data.
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Where is the DSLAM located?
At the Central Office
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Human speech or voice frequency is heard at what range?
300 - 3000Hz
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What are the 4 characteristics of a square wave?
- 1. Amplitude
- 2. Risetime
- 3. Falltime
- 4. Pulse width
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What are the 5 characteristics of a sine wave?
- 1. Voltage Peak (Vp)
- 2. Voltage Peak to Peak (Vpp)
- 3. Voltage Root Means Square (Vrms)
- 4. Cycles
- 5. Frequency
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