Introduction to Client/Server Computing MIS 3406 Department of MIS Fox School of Business Temple University

Client Server Computing How many machines are involved in running an application like SAP?

IP Address Unique address for every node on the network

My First Apartment Mailing Address: Mart Doyle 2517 Dunksferry Road Bensalem, PA 19020 Would mail sent to that address actually get to me?

Well Known Port Numbers Application 20 FTP Data 21 FTP Control 22 SSH 25 Simple Mail Transfer Protocol (SMTP) 53 Domain Name System (DNS) 69 Trivial FTP (TFTP) 80 HTTP 110 Post Office Protocol version 3 (POP3) 161 Simple Network Management Protocol (SNMP) Many others…

SSH SSH Client SSH Client SSH Server Port 22

FTP Port 21 Port 22

Netstat command before installing FTP and SSH What is listening on port 3389? Can you tell me what was the IP address of my machine when I used remote desktop to login?

Netstat command after installing FTP and SSH What is listening on ports 20 & 21? What is listening on port 22?

Localhost or 127.0.0.1 Alias for the current IP address of my machine Try a tracert to www.temple.edu Try a tracert to localhost Try a tracert to 127.0.0.1

KnockKnock.js

KnockKnockWhosThere.js

KnockKnockWhosThereWithPortNumbers.js