Transcript Protocols that Support ISP Services

ISP Services
Working at a Small-to-Medium Business or ISP –
Chapter 7
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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.
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Network Services Provided by an ISP
 Identify the network services an ISP will provide to
SOHOs and medium-sized organizations
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Protocols that Support ISP Services
 Review the TCP/IP suite of protocols
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Protocols that Support ISP Services
 Explain why a protocol would use TCP
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The TCP Connection Process
 The three-way handshake
 Retransmission
 Sequencing
 Flow Control
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Protocols that Support ISP Services
 Describe the differences between TCP and UDP ports
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Supporting Multiple Services
 Describe the purpose and function of TCP and UDP
ports
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Domain Name Service (DNS)
 Describe the purpose of networking naming system
srv2
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Domain Name Service (DNS)
 Describe the purpose and function of DNS.
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Domain Name Service (DNS)
 Describe the hierarchical design of DNS
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Domain Name Service (DNS)
 Describe the role of ISPs in the provisioning of DNS
service
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Services and Protocols
 Identify the most common services used on the Internet
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Services and Protocols
 Describe how an ISP supports the HTTP and HTTPS
protocols
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Services and Protocols
 Describe how an ISP supports the FTP protocol
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Services and Protocols
 Describe how the ISP supports the SMTP, POP3 and
IMAP protocols
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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.
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© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
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