Networks and the Internet

Transcription

1 UofM Internet Concepts TECH 1010 Dan Kohn University of Memphis Engineering Technology Department 2018 v2.1 ed. Networks and the Internet A network is a collection of computers and devices connected together, often wirelessly, via communications devices and transmission media The Internet is a worldwide collection of networks that connects millions of businesses, government agencies, educational institutions, and individuals Page : Discovering Computers Chapter 1 2 The Internet 1

2 Networks and the Internet Page 8 Figure : Discovering Computers Chapter 1 4 The Internet Page 47 Figure : Discovering Computers Chapter 2 5 Networks Network interface card (NIC) LAN WAN WLAN PAN WiMax 2

3 The Internet An IP address is a number that uniquely identifies each computer or device connected to the Internet A domain name is the text version of an IP address Top-level domain (TLD) Page 48 Figure : Discovering Computers Chapter 2 7 The Internet Page 48 Figure : Discovering Computers Chapter 2 8 The World Wide Web Page 50 Figure : Discovering Computers Chapter 2 9 3

4 Uniform Resource Locator Each web page has a unique address called a URL URL s can be comprised of: Example: Protocol://Host/Path/File.name 10 The World Wide Web Page 51 Figure : Discovering Computers Chapter 2 11 Uniform Resource Locator Path is the directory/subdirectories where the web page is located on the host Web page stored in a file with an extension (aka suffix) of HTML or HTM File names consist of prefix.suffix (suffix also called extension) Protocol http hypertext transfer protocol ftp file transfer protocol https secure http 12 4

5 The World Wide Web Information presented on the Web must be evaluated for accuracy No one oversees the content of Web pages Page 58 Figure : Discovering Computers Chapter 2 13 Things You Should Know How to get your IP address How to tell if you are connecting to the network (and what path is used to connect two systems) How to register a computer on the UofM Network Know your IP Address? To find your computer s IP address Start In Search programs and files box type cmd At the DOS prompt Ipconfig On campus, IP addresses start with 141. for a wired connection and 10. for wireless connections (172. for the UofM Guest Network). 15 5

6 Are you Connected? To see if you are connected to the internet you can use the DOS prompt window (as in the last slide) but type: ping google.com And you should see (something like): Pinging google.com [ ] with 32 bytes of data: Reply from : bytes=32 time=60ms TTL=239 Reply from : bytes=32 time=42ms TTL=239 Reply from : bytes=32 time=61ms TTL=239 Reply from : bytes=32 time=63ms TTL=239 Ping statistics for : Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 42ms, Maximum = 63ms, Average = 56ms 16 Path Between Computers To see the path (or ROUTE) used to connect two computers you can use the DOS prompt window (as in the last slide) but type: tracert google.com And you should see (something like): Tracing route to google.com [ ] over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms ea306-s1.memphis.edu [ ] 2 <1 ms <1 ms <1 ms <1 ms <1 ms <1 ms jo100-s1.memphis.edu [ ] 4 1 ms <1 ms <1 ms ms <1 ms <1 ms jo100-r4.memphis.edu [ ] 6 86 ms 88 ms 101 ms xe rtsw.chic.net.internet2.edu [ ] 7 70 ms 75 ms 79 ms ms 344 ms 585 ms * * * Request timed out ms ms 57 ms ms 73 ms 73 ms ord38s08-in-f14.1e100.net [ ] Security Security refers to the steps a computer owner takes to prevent unauthorized use of or damage to the computer Malware Viruses Spyware Adware Firewall Phishing Pharming Antivirus software 6

7 Internet and Network Attacks Users can take several precautions to protect their home and work computers and mobile devices from these malicious infections Pages Figure : Discovering Computers Chapter 5 19 Computer Security Risks Pages Figure : Discovering Computers Chapter 5 20 University of Memphis Network 7

8 Network Login If you Bring your own device on campus, you will need to log into the network the network: Network Login On Windows and Mac machines you will need to follow instructions to install Safe Connect iprint To facilitate students wishing to print from their own computers, ITD has given access to print via iprint to many of the printers in labs and other locations around campus. Instructions 8

9 LiveSafe An emergency alert system on campus Informs you, via push message, of: University closings and delays Emergencies on campus Features Download Instructions Android Device ios UMWare UM Ware allows students to use SELECTED software from off campus Blogs Students have access to create WordPress Blogs on their University Account 9

10 Using MyMemphis 28 Go to mymemphis 29 Type name and password 30 10

11 A good place to start is UofMOnline 31 UMdrive (file space accessible from anywhere with internet access) 32 For UMdrive Help umservices/umdrive.php You can give access to files placed on UMDrive to individuals and groups Many faculty use UMDrive to give students access to files 33 11

12 Library Search 34 Identity Management 35 12

13 Campus 37 Etiquette Always include a subject line and include your name if you think the person might not know who you are from your account name. Remember, without facial expressions and body language, written comments may be taken the wrong way. Be careful in wording your s. Use standard fonts. Don t use all capital letters when typing; all caps is understood to be the equivalent of shouting. Do not send large attachments without permission. Special formatting such as centering, audio messages, tables, html, etc. should be avoided unless necessary to complete an assignment or other communication. Avoid using text messaging choppiness and use capital letters to start sentences. Other Notes Do not open attachments (especially from people you do not know) VIRUSES! Use appropriate account names (sending a resume via an account ilovegames@aol.com is a bad idea) When attaching a file, make sure the person you are sending has the program to open it (when in doubt PDF!) 13

14 One Last Note Once you put something on the internet (via facebook, , etc) it is there forever do you really want an employer to see that picture of you at that party? Bibliography New Perspectives on Microsoft Office 2007, First Course, Windows XP Edition Class Notes for CGS1100, Prof. Robert W Janson, Florida Community College University of Memphis - MyMemphis webpages 14