expanded by Jozef Goetz, 2009
Computer Networks and Internet works
(a) Computer Networks and (b) Internetworks
Routing of the Application Data The Internet Protocol (IP)
Routing of the Application Data The Internet Protocol (IP)
IPv 4 Address Classes The sum of network IDs for class A, B, C = 2^7 + 2^14 + 2^21 = 1, 113, 664 networks The sum of hosts IDs for class A, B, C = 2^24 + 2^16 + 2^ 8 = 3, 758, 096, 400 hosts
IPv 4 Address Classes
IPv 4 Address Classes
IPv 4 Address Classes class C class A class C class B
http: //faculty. ulv. edu/
-a, --all print all information -m, --machine print the machine (hardware) type -n, --nodename print the machine's network node hostname --help
![[jgoetz]$ telnet -? telnet: invalid option -- ? Usage: telnet [-8] [-E] [-L] [-S](https://present5.com/presentation/5a8d2b2d9d74a2ad878dabf5ce8686d8/image-54.jpg "[jgoetz]$ telnet -? telnet: invalid option -- ? Usage: telnet [-8] [-E] [-L] [-S")
[jgoetz]$ telnet -? telnet: invalid option -- ? Usage: telnet [-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user][-n tracefile] [-b hostalias ][-r] [host-name [port]] Ctrl + D close the session
invokes a daytime service running at port 13
Displaying Information About Users
Displaying Information About Users
Displaying Information About Users // if the finger server is running
![e. g. [jgoetz]$ rlogin -l jozefg ecs. fullerton. edu: Connection refused // it is](https://present5.com/presentation/5a8d2b2d9d74a2ad878dabf5ce8686d8/image-75.jpg "e. g. [jgoetz]$ rlogin -l jozefg ecs. fullerton. edu: Connection refused // it is")
e. g. [jgoetz]$ rlogin -l jozefg ecs. fullerton. edu: Connection refused // it is not a local network
students and sorted_students are files
traceroute www. yahoo. com #some administrators disable this cmd for security
Important Internet Organizations
Web Resources
Web Resources
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