Réseaux Flashcards

1
Q

OSI

A

Open Systems Interconnection

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2
Q

7 couches

A

Physique Liaison Réseau Transport Session Présentation Application

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3
Q

Nombre de couches commutateur (switch)

A

2

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4
Q

Nombre de couches routeur

A

3

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5
Q

Couche physique

A

BIT

  • cable, modem, paire torsadées
  • prises RJ45, carte réseau
  • fibre optique
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6
Q

Couche liaison

A

TRAME (MAC)

  • ethernet, WIFI, bluetooth
  • commutateurs (switch)
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7
Q

MAC

A

Medium Access Control : unique, par constructeur, sécurité nulle (spoofing)

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8
Q

Couche réseau

A

PAQUET (IP)

  • routeur
  • ICMP (numéro séquence)
  • TTL time to live (décrémenté à chaque routeur)
  • Masque réseau
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9
Q

Masque réseau

A
  1. 255.0.0 => x.x.0.0 adresse réseau, 0.0.x.x adresse machine.
    x. x.255.255 adresse de broadcast (diffusion)
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10
Q

Couche transport

A

SEGMENT/MESSAGE (Port)

  • socket 80
  • UDP/TCP
  • netstat…
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11
Q

Couche session

A
  • ISO 8327

- RPC, Netbios

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12
Q

Couche présentation

A
  • ASCII, Unicode
  • MIME, XDR
  • SMB, AFP, ASN
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13
Q

Couche application

A

DONNÉES (GET)

  • HTTP, SMTP
  • FTP, Telnet, NFS
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