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计算机通信网中的基本思想
计算机通信网中的基本思想
§ General CS concepts
Ø Hierarchy
Ø Caching
Ø Randomization
§ Networking-specific concepts
Ø Soft state
Ø Layering
Ø (De)multiplexing
Hierarchy
§ Scalability of large systems
Ø Cannot store all information everywhere
Ø Cannot centrally coordinate each component
§ Hierarchy as a way to manage scale
Ø Divide large system into smaller pieces
Ø And manage the pieces separately
§ Hierarchy as a way to divide control
Ø Decentralized management of common
infrastructure
§ Examples of hierarchy in the Internet
Ø Example #1:
IP address blocks
IP address blocks
Ø Example #2:
Routing protocols
Routing protocols
Ø Example #3:
Domain Name System (DNS)
Domain Name System (DNS)
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