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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.

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isp services

ISP Services

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

  • 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 the Domain Name System (DNS).
  • Describe and enable common services and their protocols.
introducing isp services
Introducing ISP Services

Critical services for small-to-medium businesses:

  • Email
  • Web hosting
  • Media streaming
  • IP telephony
  • File transfer
introducing isp services1
Introducing ISP Services

Meeting customer requirements:

  • Reliability
  • Availability
protocols that support isp services
Protocols That Support ISP Services
  • The TCP/IP suite of protocols supports reliability
protocols that support isp services1
Protocols That Support ISP Services
  • Transport needs determine the choice of Transport Layer Protocol
protocols that support isp services2
Protocols That Support ISP Services

The TCP three-way handshake:

  • Synchronization
  • Synchronization acknowledgement
  • Acknowledgement
protocols that support isp services3
Protocols That Support ISP Services

How TCP supports reliability:

  • Acknowledgement
  • Retransmission
  • Sequencing
  • Flow control
protocols that support isp services4
Protocols That Support ISP Services
  • UDP: not connection-oriented, simple protocol
  • Used by online games, DHCP, DNS
protocols that support isp services5
Protocols That Support ISP Services
  • TCP and UDP use ports to support multiple services
protocols that support isp services6
Protocols That Support ISP Services
  • Socket: combination of Transport Layer port number and Network Layer IP address of host
  • Socket pair: source and destination IPs and port numbers identify each conversation
domain name system dns
Domain Name System (DNS)
  • Networking naming systems translate human-readable names into machine-readable addresses


domain name system dns1
Domain Name System (DNS)

Advantages of DNS:

  • Hierarchical structure
  • Small, manageable zones
  • Scalable
domain name system dns2
Domain Name System (DNS)

Components of DNS:

  • Resource records and domain namespace
  • Domain name system servers
  • Resolvers
domain name system dns3
Domain Name System (DNS)

DNS name resolution:

  • Dynamic updates
  • Forward lookup zones
  • Reverse lookup zones
  • Primary zones
  • Secondary zones
domain name system dns4
Domain Name System (DNS)

Implementing DNS solutions:

  • ISP DNS servers
  • Local DNS servers
services and protocols
Services and Protocols
  • ISPs provide many business-oriented services
  • Secure versions of Application Layer protocols support customer security requirements
services and protocols1
Services and Protocols
  • HTTP is a request-response protocol
  • HTTPS adds authentication and encryption
services and protocols2
Services and Protocols
  • FTP uses a protocol interpreter (PI) and data transfer process (DTP)
  • Two connections: one to send commands, one for actual file data transfer
services and protocols3
Services and Protocols
  • SMTP: specific message format and processes running on both client and server
  • POP3: mail is downloaded from server to client and then deleted
  • IMAP4: keeps messages on server
  • 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.