Networking Fundamentals Flashcards
1
Q
Physical Layer
A
Layer 1
Physical shared medium
Standards for transmitting onto the medium
Standards for receiving from the medium
No access control
No uniquely identified devices
No device => devices communications
2
Q
Data Link
A
Layer 2
Identifiable devices
Media access control (sharing)
Collision detection
Unicast .. 1:1
Broadcast 1:ALL
Switches - Like hubs w/Super powers (layer 2)
3
Q
Network
A
Layer 3
IP addresses (IPv4/v6) - cross network addressing
ARP - find MAC address, for this IP
Route - where to forward this packet
Route tables - multiple routes
Router - moves packets from SRC to DST - encapsulating in L2 on the way
Device <=> device communications over the internet ..
No method for channels of communications .. SRC IP <=> DST IP Only
Can be delivered out of order…
