Introductory Networking Flashcards

1
Q

OSI model layers (7)

A
Application
Presentation
Session
Transport
Network
Data link
Physical
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2
Q

Layer 7 - Application

A
  • provides networking options to programs running on a PC

- work with apps - providing an interface to them to transmit data

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3
Q

Layer 6 - Presentation

A
  • data from application layer is standardised to format that receiving PC can understand (encryption, compression, other transformation)
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4
Q

Layer 5 - Session

A
  • set a connection with remote PC
  • if cannot - sends back an error
  • if can - maintain connection
  • unique sessions
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5
Q

Layer 4 - Transport

A
  • choose the protocol (common TCP or UDP)

- divided to bite-sized pieces (TCP - segments, UDP - datagrams)

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6
Q

Layer 3 - Network

A
  • logical addressing
  • IP
  • locating a destination PC
  • best path to take
  • packet is generated
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7
Q

Layer 2 - Data link

A
  • physical addressing
  • MAC
  • check of corruption
  • ready for transmission
  • frames
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8
Q

Layer 1 - Physical

A
  • binary to signal and visa versa

- stream of bits

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9
Q

DNS Servers (types, where are domains stored, hierarchy)

A
  • domain can be stored in PC’s local cache
  • the recursive server is stored in your router
  • 13 root name servers
  • Top-Level domain (TLD) servers - extensions
  • Authoritative name server - actual domains
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