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1 the Internet Internet Levels of Access to the Internet

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1 the Internet Internet Levels of Access to the Internet The Internet DS 4250 - Business Data Communications Slide 1 Internet z Collection of interconnected networks with a common protocols. 4TCP/IP z The networks are linked through various high-speed backbones. z Routing method is hierarchical. z Can follow the packet movement on Gemini 4$ mu trace www.dell.com DS 4250 - Internet Slide 2 Levels of Access to The Internet NAP National Backbone Regional Network Internet Service Provider Consumer and Business Market ¾http://www.ispworld.com/isp/bb/n_america.htm DS 4250 - Internet Slide 3 1 Internet Structure Local ISP Local ISP Regional ISP National ISP Regional ISP National ISP NAP National ISP NationalNational ISP ISP Regional ISP National ISP NationalNational ISP ISP NAP NationalNational ISP ISP NationalNational ISP ISP Regional ISP Regional ISP Local ISP Regional ISP Regional ISP Regional ISP Regional ISP Regional ISP Regional ISP MAE Local ISP Regional ISP Regional ISP Local ISP Regional ISP Local ISP Local ISP Local ISP Local ISP Local ISP Local ISP Local ISP Local ISP Figure 9-1 Basic Internet Architecture DS 4250 - Internet Slide 4 Concerns in Choosing an ISP z Examine the backbone of the provider 4Does the backbone include needed areas 4Check the speed of the network 4Examine the redundancy of the network 4What power back-ups do they have 4Connections to other providers • At least three network access points 4What is the guarantee of performance DS 4250 - Internet Slide 5 Internet Addressing z Based on the software address for each device 4A unique number for each device z Used to designate the location of the device on the network z Basic address consists of four sets of octets 4Four number from 0 to 255 (total of 32 bits) z Based on a hierarchical routing scheme 4Comparable to the PSTN numbering system 4Each octet narrows the scope of the routing process DS 4250 - Internet Slide 6 2 Three Classes of Networks Octet 1Octet 1 Octet 1 Octet 1 Class A: Network Host Host Host Class B: Network Network Host Host Class C: Network Network Network Host DS 4250 - Internet Slide 7 Internet Classes Class Example Number Number of Available Hosts A 12.0.0.0 127 16 million B 149.149.0.0 16,000 65,536 C 209.18.14.0 2 Million 256 DS 4250 - Internet Slide 8 Sub-networks z Each node on the same network share the network address part of the IP address 4The remaining octets define the node address z Node address can be divided into subnets z Subnet mask defines which part of the IP address is the subnet 4255.255.0.0 --> Subnet at 2nd octet 4255.255.255.0 --> Subnet at 3rd octet DS 4250 - Internet Slide 9 3 Internet Address Format (B Class) Network Subnet Host 149.149.44.55 (615) 372-6308 DS 4250 - Internet Slide 10 Domain Name Services z Responsible for mapping between host names (URLs) and IP addresses www.tntech.edu 149.149.10.1 z The task of maintaining this is divided into domains (edu, com, gov, org, etc.) 4The top level DNS for each domain is the root name servers 4Root name server does not know about individual systems within each sub-domain, only the DNS server that is responsible for them. DS 4250 - Internet Slide 11 DNS Hierarchy .edu DNS .com DNS .org DNS Server Server Server Local DNS Local DNS Local DNS tntech.edu dell.com good.org Local DNS Local DNS Local DNS etsu.edu sun.com nice.org Local DNS Local DNS Local DNS mtsu.edu microsoft.com big.org Example: request from ns.tntech.edu to ns.etsu.edu DS 4250 - Internet Slide 12 4 TCP/IP Protocol z Originally a military protocol designed to be dependable and resilient z Used as the common language (protocol) for all Internet traffic z Incorporates a variety of protocols at different layers in the OSI model 4Transaction Control Protocol (TCP) 4Internet Protocol (IP) DS 4250 - Internet Slide 13 DoD versus OSI Model DoD Model OSI Model Application Process/ Presentation Application Session Host-to-Host Transport Internet Network Data Link Network Access Physical DS 4250 - Internet Slide 14 Process/Application Layer z Consists of various applications and services commonly used on the Internet 4Defines Node-to-Node communications z Common protocols in this layer 4Telnet 4File Transfer Protocol (FTP) 4Simple Mail Transfer Protocol (SMTP) 4Simple Network Management Protocol (SNMP) DS 4250 - Internet Slide 15 5 Host-to-Host Protocol z Creates reliable end-to-end communications and ensures error-free delivery of data z Provides packet sequencing and data integrity z Consists of two protocols 4Transaction Control Protocol (TCP) 4User Datagram Protocol (UDP) DS 4250 - Internet Slide 16 Internet Protocol z Provides end-to-end routing across the network 4Also controls the communications flow between two networks z Provides a single network interface to the upper-layer protocols z Separates segments from the host-to- host layer into datagrams (packets) DS 4250 - Internet Slide 17 Network Access z Monitors the data exchange between the host and the network 4Provides the frame and physical access to the network z Works with common data link protocols 4Ethernet, Token ring, FDDI DS 4250 - Internet Slide 18 6 Address Resolution Protocol (ARP) z Used to locate the hardware address for a host from a known IP address. 4Works with the media access control address z Needed to produce the frame for the network access layer z First checks to ARP cache. If not listed, it sends a broadcast message. The machine with the IP address sends back its MAC address DS 4250 - Internet Slide 19 Types of Internet Servers z Mail Server z FTP Server z Gopher Server z Web Server DS 4250 - Internet Slide 20 World Wide Web Server z A web (HTTP) server is a computer, connected to the Internet, that is running software compatible with the HTTP protocol. z Provides various features: 4Access control 4Encryption 4Execution of CGI files 4Configuration of the server DS 4250 - Internet Slide 21 7 HyperText Transfer Protocol z This is the protocol that defines how the WWW works z Based on the Client/Server Model. z It is a request/response protocol. 4The client makes the request. 4The server responds to the request z This provides a stateless environment DS 4250 - Internet Slide 22 WEB PAGE PUBLISHING WEB page is published using WEB publishing software running either on a client or a server. WEB page is formatted using HTML (Hypertext Markup Language.) SERVER Stand-alone PC runs HTML based publishing software which creates an HTML formatted WEB page. This page is then forwarded and WWW page WWW page LAN-Attached client runs First choice -- click here. First choice -- click here. Second choice -- click here. Second choice -- click here. Third choice -- click here. Third choice -- click here. Fourth choice -- click here. stored on a WEB Fourth choice -- click here. Fifth choice -- click here. Fifth choice -- click here. Sixth choice -- click here. Sixth choice -- click here. Server. Server-based WEB Page publishing software to create WWW page First choice -- click here. Second choice -- click here. Third choice -- click here. Fourth choice -- click here. an HTML formatted WEB Fifth choice -- click here. Sixth choice -- click here. MODEM HTML page which is stored on the formatted WEB Server. page WWW page First choice -- click here. Second choice -- click here. Third choice -- click here. Fourth choice -- click here. Fifth choice -- click here. Sixth choice -- click here. HTML request formatted page TCP/IP protocol INTERNET delivery WEB Server supporting HTTP l WEB o (Hypertext Transport c o SERVER t Protocol.) o r p P I WWW page / First choice -- click here. Second choice -- click here. Third choice -- click here. Fourth choice -- click here. Fifth choice -- click here. P Sixth choice -- click here. WEB page delivered from server to the client for display C T Client PC with properly formatted request for WEB page installed WEB browser software DS 4250 - Internet Slide 23 Mail Server z Works on the store and forward principle: 4Message is sent to the server and stored for the user. 4The messages are forwarded to the user when requested. z Need client software to access the messages. z [email protected] 4carmstrong --> user name 4tntech.edu --> server name DS 4250 - Internet Slide 24 8.
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