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

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

4. IP Address
Unique address for every node on the network

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

6. 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…

7. SSH
SSH Client
SSH Client
SSH Server
Port 22

8. FTP
Port 21
Port 22

9. 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?

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

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

12. KnockKnock.js

13. KnockKnockWhosThere.js

14. KnockKnockWhosThereWithPortNumbers.js