DNS

DNS recursor DNS解析器

Root nameserver

TLD nameserver

什么是ASN

什么是任播(Anycast)DNS?

UniCast 单播 MultiCast 多播 BroadCast 广播 实际是 BGP Anycast 任意播或泛播 AnyCast IP拥有MultiCast和UniCast各自的部分特性： 主要靠BGP的路由协议，有多个相同的ip的server，路由协议找到“最近”的一台server

任播指一个IP可以应用到多个服务器上

Ip show / manipulate routing, devices, policy routing and tunnels

What is a DNS zone?

A DNS zone is a portion of the DNS namespace that is managed by a specific organization or administrator. 一个DNS zone是DNS名字空间的一部分，它被特定组织和管理机构管理。

DNS root server

TLD server

Akamai

• Keywords Akamai, CDN, overlay networks, application acceleration, HTTP, DNS, content delivery, quality of service, streaming media
• 1. INTERNET APPLICATION REQUIREMENTS
• 1. INTERNETDELIVERYCHALLENGES
• 1. DELIVERY NETWORK OVERVIEW
• 4.1 Delivery Networks as Virtual Networks
• 4.2 Anatomy of a Delivery Network
• 4.3 System Design Principles
• 1. HIGH-PERFORMANCE STREAMING AND CONTENT DELIVERY NETWORKS
• 5.1 Video-grade Scalability
• 5.2 StreamingPerformance
• 5.3 A Transport System for Contentand Streaming Media Delivery
• 1. HIGH-PERFORMANCE APPLICATION DELIVERY NETWORKS
• 6.1 A Transport System for Application Acceleration
• 6.2 Distributing Applications to the Edge
• 1. PLATFORM COMPONENTS
• 7.1 Edge Server Platform
• 7.2 Mapping System
• 7.3 Communications and Control System
• 7.4 Data Collection and Analysis System
• 7.5 Additional Systems and Services
• 1. EXAMPLE:MULTI-LEVEL FAILOVER

Akamai DNS:Providing Authoritative Answers to the World’s Queries

• 2 CHARACTERIZING QUERY TRAFFIC
• 3 SYSTEM ARCHITECTURE
• 3.1 Authoritative Nameservers
• 3.2 Supporting Components
• 4 RESILIENCY
• 4.1 Anycast Failover Mechanism
• 4.2 Failure Resiliency
• 4.3 Attack Resiliency
• 5 DNS PERFORMANCE
• 5.1 Anycast Performance Tuning
• 5.2 Two-Tier Delegation System

End-User Mapping: Next Generation Request Routing for Content Delivery

• 1. THE MAPPING SYSTEM
• 2.1 End-User Mapping
• 2.2 Mapping System Architecture
• 1. UNDERSTANDING CLIENTS AND THEIR NAME SERVERS
• 3.1 Collecting Client-LDNS pairs
• 3.2 How far are clients from their LDNSes
• 3.3 How far are clients that use the same LDNS from each other?
• 1. PERFORMANCE IMPACT
• 4.1 Performance metrics
• 4.2 Collecting performance information
• 4.3 Performance Analysis
• 4.4 Why Download Performance Matters
• 4.5 The Benefits of EDNS0 Adoption
• 1. SCALING CHALLENGES
• 5.1 Tradeoffs in choosing the mapping units
• 5.2 Dealing with greater DNS query rates

references

• rfc1034 DNS
• rfc1035 DNS
• what-is-the-difference-between-authoritative-and-recursive-dns-nameservers)
• dns-zone
• dns-root-server
• Akamai DNS: Providing Authoritative Answers to the World’s Queries