demysifying the network communicaion layers · 2016. 11. 24. · demysifying the network...
TRANSCRIPT
Appliance&EquipmentEnergyPoliciesforaConnectedWorld14Nov2016,OCawa,Canada
DemysIfyingtheNetworkCommunicaIonLayers
StevenBeleKch
EDNAOperaKngAgent
6
GoalofthisSession
n Simplifyourunderstanding
n BriefoverviewofOSI“layer”modelforcommunicaKonsnetworks
n ProvidecontextastowherecommunicaKonsprotocols“fit”
7
OSI=OpenSystemsInterconnecIonModel
n ConceptuallayermodelforcommunicaKonsnetworks
n Itsgoals
n Assimpleaspossible(andnomore!)
n Interoperabilityofdiversesystems
n AgnosKctounderlyingstructureortechnology
8
Eachlayeronlyinteractswithadjacentlayer
Layer Example Functions Example Protocol Data U
pp
er
7. Application Send email POP3, SMTP Words on a screen! Upper layer data (incl payload)
6. Presentation Define characters ASCII
5. Session Handshaking SCP
Mid
dle
4. Transport Flow control, error detection TCP Segments
3. Network IP addressing, routing IPv6 Packets
Low
er 2. Data Link Transfer data across
physical link WiFi link layer Frames
1. Physical Electrical & physical specifications WiFi physical layer Bits
10
1. Physical Layer
2. Data Link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer
1. Physical Layer
2. Data Link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer
flow of bits
encapsulate
strip encapsulation
11
Take-HomeMessages
n Upperlayers
n Howdataisstructured&presented
n Keyfocus
n Middlelayers
n Highlytechnical,oflessconcern
n Lowerlayers
n HowthebitsaretransmiNed
n Oflessconcern(?)
n Keepinmindthisahernoon
12
Thanksto
n BruceNordman