Network+ 1.1

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9 Terms

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Physical (Layer 1)

Physical - Sends the raw 1s and 0s as signals (Cables, Wi-Fi, electricity)

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Data Link (Layer 2)

Delivers data to the next device on the local network (MAC addresses, switches)

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Network (Layer 3)

Routes data across networks to the right computer (IP addresses, routers)

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Transport (Layer 4)

Gets data to the right app on the computer, reliably (TCP) or fast (UDP) (Ports)

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Session (Layer 5)

Starts, maintains, and ends the conversation between apps (Keeping you “logged in”). Also handles control/tunneling protocols

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Presentation (Layer 6)

Formats, compresses, and encrypts application data (SSL encryption) so both sides can read it

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Application (Layer 7)

Protocols apps use to talk (HTTPS, FTP, DNS POP3). Also handles everything you see on the screen

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Protocol Data Unit (PDU) by layer

Layer 7-5 - Data

Layer 4 - Segment/Datagram

Layer 3 - Packet

Layer 2 - Frame

Layer 1 - Bits

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The Three Private Ranges (RFC 1918)

10.0.0.0 – 10.255.255.255

172.16.0.0 – 172.31.255.255

192.168.0.0 – 192.168.255.255