Скачать презентацию expanded by Jozef Goetz 2009 Computer Networks Скачать презентацию expanded by Jozef Goetz 2009 Computer Networks

5a8d2b2d9d74a2ad878dabf5ce8686d8.ppt

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expanded by Jozef Goetz, 2009 expanded by Jozef Goetz, 2009

Computer Networks and Internet works Computer Networks and Internet works

(a) Computer Networks and (b) Internetworks (a) Computer Networks and (b) Internetworks

Routing of the Application Data The Internet Protocol (IP) Routing of the Application Data The Internet Protocol (IP)

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 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 IPv 4 Address Classes

IPv 4 Address Classes class C class A class C class B IPv 4 Address Classes class C class A class C class B

http: //faculty. ulv. edu/ http: //faculty. ulv. edu/

-a, --all print all information -m, --machine print the machine (hardware) type -n, --nodename -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 [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 invokes a daytime service running at port 13

Displaying Information About Users Displaying Information About Users

Displaying Information About Users Displaying Information About Users

Displaying Information About Users // if the finger server is running Displaying Information About Users // if the finger server is running

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 students and sorted_students are files

traceroute www. yahoo. com #some administrators disable this cmd for security traceroute www. yahoo. com #some administrators disable this cmd for security

Important Internet Organizations Important Internet Organizations

Web Resources Web Resources

Web Resources Web Resources