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ISP Services Working at a Small-to-Medium Business or ISP – Chapter 7 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1 Objectives Describe the network services provided by an ISP Describe the protocols that support the network services provided by an ISP Describe the purpose, function, and hierarchical nature of Domain Name Service (DNS) Describe and enable common services and their protocols. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 2 Network Services Provided by an ISP Identify the network services an ISP will provide to SOHOs and medium-sized organizations © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 3 Protocols that Support ISP Services Review the TCP/IP suite of protocols © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 4 Protocols that Support ISP Services Explain why a protocol would use TCP © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 5 The TCP Connection Process The three-way handshake Retransmission Sequencing Flow Control © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 6 Protocols that Support ISP Services Describe the differences between TCP and UDP ports © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 7 Supporting Multiple Services Describe the purpose and function of TCP and UDP ports © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 8 Domain Name Service (DNS) Describe the purpose of networking naming system srv2 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 9 Domain Name Service (DNS) Describe the purpose and function of DNS. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 10 Domain Name Service (DNS) Describe the hierarchical design of DNS © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 11 Domain Name Service (DNS) Describe the role of ISPs in the provisioning of DNS service © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 12 Services and Protocols Identify the most common services used on the Internet © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 13 Services and Protocols Describe how an ISP supports the HTTP and HTTPS protocols © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 14 Services and Protocols Describe how an ISP supports the FTP protocol © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 15 Services and Protocols Describe how the ISP supports the SMTP, POP3 and IMAP protocols © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 16 Summary TCP and UDP use port numbers to provide multiple services to hosts. DNS uses a hierarchical system of databases to resolve names and IP addresses of known hosts within networks and across the Internet. The most common services used on the Internet include FTP, FTPS, HTTP, HTTPS and SMTP. ISPs use high-performance servers to support these services. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 17 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 18