Bài giảng TCP/IP - Chapter 18: Domain Name System (DNS)

Tài liệu Bài giảng TCP/IP - Chapter 18: Domain Name System (DNS): Chapter 18Domain NameSystem (DNS)CONTENTS NAME SPACE DOMAIN NAME SPACE DISTRIBUTION OF NAME SPACE DNS IN THE INTERNET RESOLUTION DNS MESSAGES TYPES OF RECORDS COMPRESSION EXAMPLES DDNS ENCAPSULATIONNAME SPACE18.1DOMAINNAMESPACE18.2Figure 18-1Domain name spaceFigure 18-2Domain names and labelsFigure 18-3FQDN and PQDNFigure 18-4DomainsDISTRIBUTION OFNAME SPACE18.3Figure 18-5Hierarchy of name serversFigure 18-6Zones and domainsA primary server loads all information from the disk file; the secondary server loads all information from the the primary server. When the primary downloads information from the secondary, it is called zone transfer.DNS IN THE INTERNET18.4Figure 18-7DNS in the InternetFigure 18-8Generic domainsFigure 18-9Country domainsFigure 18-10Inverse domainRESOLUTION18.5Figure 18-11Recursive resolutionFigure 18-12Iterative resolutionDNSMESSAGES18.6Figure 18-13DNS messagesFigure 18-14Query and response messagesFigure 18-15Header formatFigure 18-16QR: Query/ResponseOpCode: ...

ppt41 trang | Chia sẻ: honghanh66 | Ngày: 19/03/2018 | Lượt xem: 46 | Lượt tải: 0download
Bạn đang xem trước 20 trang mẫu tài liệu Bài giảng TCP/IP - Chapter 18: Domain Name System (DNS), để tải tài liệu gốc về máy bạn click vào nút DOWNLOAD ở trên
Chapter 18Domain NameSystem (DNS)CONTENTS NAME SPACE DOMAIN NAME SPACE DISTRIBUTION OF NAME SPACE DNS IN THE INTERNET RESOLUTION DNS MESSAGES TYPES OF RECORDS COMPRESSION EXAMPLES DDNS ENCAPSULATIONNAME SPACE18.1DOMAINNAMESPACE18.2Figure 18-1Domain name spaceFigure 18-2Domain names and labelsFigure 18-3FQDN and PQDNFigure 18-4DomainsDISTRIBUTION OFNAME SPACE18.3Figure 18-5Hierarchy of name serversFigure 18-6Zones and domainsA primary server loads all information from the disk file; the secondary server loads all information from the the primary server. When the primary downloads information from the secondary, it is called zone transfer.DNS IN THE INTERNET18.4Figure 18-7DNS in the InternetFigure 18-8Generic domainsFigure 18-9Country domainsFigure 18-10Inverse domainRESOLUTION18.5Figure 18-11Recursive resolutionFigure 18-12Iterative resolutionDNSMESSAGES18.6Figure 18-13DNS messagesFigure 18-14Query and response messagesFigure 18-15Header formatFigure 18-16QR: Query/ResponseOpCode: 0 standard, 1 inverse, 2 server statusAA: AuthoritativeTC: TruncatedRD: Recursion DesiredRA: Recursion AvailablerCode: Status of the errorFlags fieldsTYPESOFRECORDS18.7Figure 18-17Question record formatFigure 18-18admin.atc.fhda.edu.Query name formatFigure 18-19Resource record formatCOMPRESSION18.8Figure 18-20Format of an offset pointerEXAMPLES18.9Example 1A resolver sends a query message to a local server to find the IP address for the host “chal.fhda.edu.”. We discuss the query and response messages separately.Figure 18-21Example of a query messageFigure 18-22Example of a response messageExample 2An FTP server has received a packet from an FTP client with IP address 153.2.7.9. The FTP server wants to verify that the FTP client is an authorized client. Figure 18-23Example of inverse query messageFigure 18-24Example of inverseresponse messageDDNS18.10ENCAPSULATION18.11DNS can use the services of UDP or TCP using the well-known port 53.

Các file đính kèm theo tài liệu này:

  • pptch18_7197.ppt
Tài liệu liên quan