transmission-sp10-narrated

Information Transmission on the Net : 

Information Transmission on the Net Lisa Dubuc DIG110- Introduction to Web Technologies Niagara County Community College

Overview : 

Overview How information gets from one location to another How one computer finds another computer The rules of communication needed so that computers can understand one another

Slide 3: 

Sending Information over the Internet

TCP/IP Suite of Protocols : 

TCP/IP Suite of Protocols Governs communication over the Internet. TCP-Lists the Language or Protocol used by each application Web Browsers: HTTP E-mail: SMTP or POP FTP Software: FTP

TCP/IP Suite of Protocols : 

TCP/IP Suite of Protocols TCP (Transmission Control Protocol) Responsible for breaking up and reassembling data into packets and routing them to their destination. Establishes a connection from host to host before it begins transmitting data 3. Guarantees Delivery IP (Internet Protocol) Figures out how each data packet is to be sent from point A to point B. Makes sure it travels in the most efficient path

Packet Switching Network : 

Packet Switching Network Information is broken into data packets Containing: The Internet Address of both the sending and receiving computers The size of the date packet The order in which the packet is to be used when re-assembled

Routing on the Internet : 

Routing on the Internet How one computer finds another on the Internet when it knows an IP address How networks that make up the Internet are internetworked together How they communicate with one another Forwarding a packet to the next Internet router is called a hop To trace the hops from your computer to another computer over the Internet you can use the tracert utility in windows

How Data Travels Across Interconnected Networks : 

How Data Travels Across Interconnected Networks Networks are connected by routers

Addressing on the Internet : 

Addressing on the Internet Methods used to identify devices and programs Physical address Permanently embedded in a network interface card Identifies a device on a LAN IP address Identifies a computer, printer, or other device on the Internet Domain name An easy-to-remember word or phrase for an IP address Port address A number that identifies a program running on a computer

Physical Addresses : 

Physical Addresses Also called MAC (Media Access Control) address or adapter address 6-byte addresses unique to each NIC card and assigned by manufacturers Often printed on the adapter

MAC Addresses : 

MAC Addresses The most absolute of addresses; they do not change as long as the NIC does not change All hosts on the same network must communicate by their MAC addresses Computers on different networks use IP addresses to communicate

IP Addresses : 

IP Addresses 32-bit addresses consisting of four numbers separated by periods, used to uniquely identify a device on a network that uses TCP/IP protocols The first numbers identify the network; the last numbers identify the host Example: 136.223.18.180 =www.sln.suny.edu Lookup – http://www.network-tools.com

IP/Host Lookup : 

IP/Host Lookup

Static vs Dynamically Assigned IP Addresses : 

Static vs Dynamically Assigned IP Addresses Static- permanent Dynamic- valid during one session

Ports : 

Ports Numbers used to address software or services running on a computer IP Address + Port Address =Socket 69.32.133.769:80

Domain Names : 

Domain Names Unique, text-based names that identify IP addresses, also called a URL (Uniform Resource Locator) Typically end in .edu, .gov, .com, .org, or .net

Dissecting a URL : 

Dissecting a URL http://www.niagaracc.suny.edu/online/index.html WWW Protocol Host name or web server Top Level Domain Name Folder or directory File

Questions : 

Questions