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

2. 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.

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

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

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

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

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

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

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

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

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

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

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

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

15. Services and Protocols
Describe how an ISP supports the FTP protocol

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

17. 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.