Transcript Introduction

Geheugen, distributie en netwerken
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Netwerken: de basis voor distributie van gegevens en
taken (processen)
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bestaan zo’n 40 jaar, zeer snelle ontwikkeling
“naadloze” inpassing van nieuwe hardware / software
basis daar voor: Protocol Hierarchy Models
security aspecten: in apart college
Veel nieuwe ontwikkelingen in gedistribueerde systemen
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multi-core computers, parallelle systemen, the Cloud
Geheugen
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enige lang bestaande onderwerpen (virtueel geheugen)
nieuwe ontwikkelingen
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Networks
Chapter 1
Introduction
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Transmission
Types of transmission methods
• Broadcast links
– wired
– wireless
– medium access control (chapter 4)
• Point-to-point links
– usually wired
– routing
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Wireless-Mobile combination
Combinations of wireless networks and mobile computing.
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Local Area Networks
Two broadcast networks
(a) Bus
(b) Ring, hardly used anymore
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Metropolitan Area Networks
A metropolitan area network based on cable TV.
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Wide Area Networks
Relation between hosts on LANs and the subnet.
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Software Protocol Hierarchies
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Layers, protocols, and interfaces.
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Information flow
information flow supporting virtual communication in layer 5
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Example Hierarchy
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The philosopher-translator-secretary architecture.
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Design Issues for the Layers
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Independence
Services
Addressing
Error Control
Flow Control
Multiplexing
Routing
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Connection-Oriented and Connectionless
Services
Six different types of service.
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TCP/IP –OSI models
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OSI Reference Model
The OSI
reference
model.
Nice
theoretical
framework
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Hybrid Model
The hybrid reference model to be used in this book.
Best of the two
Largely in use, enhanced with “sublayers”
Trend: management in third dimension
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Initial TCP/IP protocols
Protocols and networks in the TCP/IP model initially.
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IP packets
A stream of packets from sender to receiver.
Packets may go over different routes
Currently practically only IP packets (also for voice),
possibly internally packed in larger packets or
distributed over smaller cells like in ATM
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IEEE 802 Standards
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The 802 working groups. The important ones are
marked with *. The ones marked with  are
hibernating. The one marked with † gave up.
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