Working at a Small-to-Medium Business or ISP – Chapter 7 ISP Services Working at a Small-to-Medium Business or ISP – Chapter 7

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.

Network Services Provided by an ISP Identify the network services an ISP will provide to SOHOs and medium-sized organizations

Protocols that Support ISP Services Review the TCP/IP suite of protocols

Protocols that Support ISP Services Explain why a protocol would use TCP

The TCP Connection Process The three-way handshake Retransmission Sequencing Flow Control

Protocols that Support ISP Services Describe the differences between TCP and UDP ports

Supporting Multiple Services Describe the purpose and function of TCP and UDP ports

Domain Name Service (DNS) Describe the purpose of networking naming system srv2

Domain Name Service (DNS) Describe the purpose and function of DNS.

Domain Name Service (DNS) Describe the hierarchical design of DNS

Domain Name Service (DNS) Describe the role of ISPs in the provisioning of DNS service

Services and Protocols Identify the most common services used on the Internet

Services and Protocols Describe how an ISP supports the HTTP and HTTPS protocols

Services and Protocols Describe how an ISP supports the FTP protocol

Services and Protocols Describe how the ISP supports the SMTP, POP3 and IMAP protocols

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.