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Enterprise Networking > week 1 reading > Flashcards

week 1 reading Flashcards

1
Q

What are the 7 layers?

A
  1. Physical
  2. Datalink
  3. Network
  4. Transport
  5. Session
  6. Presentation
  7. Application

“All People Seem To Need Data Processing”

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1
Q

What is data called in the OSI model?

A

Protocol Data units (PDU)

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2
Q

What is data called in the physical layer?

A

Bits

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3
Q

What is data called in the datalink layer?

A

Frames

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4
Q

What is data called in the Network layer?

A

Packets

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5
Q

What is data called in the transport layer?

A

Segments

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6
Q

Current State Modulation

A

The absence/presence of voltage dictates 1s and 0s (note: voltage tries to maintain average of 0)

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7
Q

State transition Modulation

A

state of change dictates 1s and 0s

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8
Q

What is the physical layer responsible for?

A

How bits are represented on medium
wiring standards
topology
synchronizing bits
Bandwidth usage
multiplexing strategy

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9
Q

What are the two parts of the data link layer?

A

MAC (media access control)
LLC (Logic Link control)

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10
Q

What is a MAC address?

A

unique 48 bit address burned into the Network interface card to uniquely identify your device

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11
Q

Ethernet

A

Devices on a shared segment check for traffic before transmitting, retransmits if there’s collision

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12
Q

What are the three ways that LLC synchronizes transmissions?

A

Isynchronous - coordinating through external device’s clock
asychronous - devices look at their own clock
Synchronous - device share clock with each other

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13
Q

What is the MAC sublayer (data-link) responsible for?

A

Physical addresses, Logical topologies and transmission methods

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14
Q

What is the LLC Sublayer responsible for?

A

Connection services (flow control & error checking) and Transmission synchronization

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15
Q

What is the Network layer responsible for?

A

Logical addressing
Switching
Route discovery and selection
Connection services

16
Q

Packet switching

A

dividing data into packets, attaching headers and destination address

17
Q

What does a router do?

A

Forwards Packets based on logical addresses. Usually found in the Network layer

18
Q

What does the transport layer contain?

A

Protocols (TCP/UDP)
Windowing
Buffering

19
Q

Sliding Window Size

A

The amount of segments being sent at one time which increases each successful transmission + acknowledgement

20
Q

Buffering/Queue

A

Memories to store segments until bandwidth is available at the destination to send more

21
Q

What does the session layer do?

A

Setting up a session
Maintaining a session
tearing down a session

22
Q

What does the presentation layer do?

A

Data formatting (ascii)
Encryption

23
Q

What is the application layer?

A

Services that support applications and let’s applications know that certain services are available to those applications (ie printers

Enterprise Networking (7 decks)

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