IMPLEMENTING NAME RESOLUTION USING DNS

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IMPLEMENTINGNAME RESOLUTION USING DNS

• Chapter 3

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WHAT IS NAME RESOLUTION?

• Name resolution is the process that translates
  computer names that are easy for users to
  understand to numerical Internet Protocol (IP)
  addresses, which are difficult for users to
  remember but necessary for TCP/IP communications.

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OVERVIEW OF DNS

• Benefits of DNS
• Scalability
• Constancy
• Ease of use
• DNS overview
• Domain Name System (DNS)
• DNS zones
• Types of DNS servers
• DNS resource records
• DNS resolvers

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DOMAIN NAMESPACE
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INSTALLING DNS
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DNS ZONES
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STANDARD ZONES
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ACTIVE DIRECTORYINTEGRATED ZONES

• Zone types
• Forward lookup
• Reverse lookup
• Benefits
• Fault tolerance
• Security
• Multimaster
• Efficient replication
• Secondary zones

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ROOT HINTS
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DNS SERVER TYPES
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DNS RESOURCE RECORD TYPES

• Start of authority (SOA)
• Name server (NS)
• Host address (A)
• Pointer (PTR)
• Canonical name (CNAME)
• Mail exchanger (MX)
• Service locator (SRV)
• Other record types

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USING ITERATIVE QUERIES IN THE DNSQUERY PROCESS
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USING RECURSIVE QUERIES IN THE DNS QUERY PROCESS
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QUERY RESPONSES

• Positive answer
• Authoritative answer
• Referral answer
• Negative answer

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NAME SERVER CACHING

• Improves query response time
• Reduces network traffic

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DELEGATING ZONES
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UNDERSTANDING ZONE TRANSFERS
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CONTROLLING WHICH SERVERS ARENOTIFIED OF UPDATES
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UNDERSTANDING FORWARDING

• Standard forwarding
• Conditional forwarding

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SUMMARY

• What is DNS?
• DNS zone types
• Root hints
• DNS server types
• DNS record types
• DNS query process
• Delegating zones
• Zone transfer
• Forwarding