网际网路协定基础介绍.ppt

* * * * Data Communications and Computer Networks: A Business Users Approach, Fifth Edition * Remote Login (Telnet) Allows a user to remotely log in to a distant computer site User usually needs a login and password to access a remote computer site User saves money on long-distance telephone charges Data Communications and Computer Networks: A Business Users Approach, Fifth Edition * Voice Over IP The transfer of voice signals using a packet-switched network and the IP protocol Voice over IP (VoIP) can be internal to a company (private VoIP) or can be external using the Internet VoIP consumes many resources and may not always work well, but can be cost-effective in certain situations Data Communications and Computer Networks: A Business Users Approach, Fifth Edition * Voice Over IP (continued) Three basic ways to make a telephone call using VoIP: PC to PC using sound cards and headsets (or speakers and microphone) PC to telephone (need a gateway to convert IP addresses to telephone numbers) Telephone to telephone (need gateways) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Data Communications and Computer Networks: A Business Users Approach, Fifth Edition 網際網路協定基礎介紹 Data Communications and Computer Networks: A Business User’s Approach Fifth Edition (Chap 10) Data Communications and Computer Networks: A Business Users Approach, Fifth Edition * Internet Protocols To support the Internet and all its services, many protocols are necessary Some of the protocols that we will look at: Internet Protocol (IP) Transmission Control Protocol (TCP) Address Resolution Protocol (ARP) Dynamic Host Configuration Protocol (DHCP) Network Address Translation (NAT) Data Communications and Computer Networks: A Business Users Approach, Fifth Edition * Internet Protocols (continued) Recall that the Internet with all its protocols follows the TCP/IP protocol suite (Internet model) An application, such as e-mail, resides at the highest layer A transport