Lesson 5 - ICND1(1.4) Describe common networking applications including web applications

Here are some common networking applications:

Application | Port  (TCP / UDP  / Both) |  Description / Use

HTTP            80                                         Unsecure Web Browsing

HTTPS         443                                        Secure Web Browsing (SSL)

DHCP           67 (Server), 68 (Client)       Dynamic Host Configuration Protocol

FTP               20 (Data),21 (Control)        File Transfer Protocol

TFTP            69                                         Trivial File Transfer Protocol

Telnet           23                                         Telnet

SSH              22                                         Secure Shell

SNMP          161 (Query), 162 (Trap)      Simple Network Management Protocol

SMTP          25                                          Simple Mail Transfer Protocol

POP3            110                                         Post Office Protocol 3

ICMP           NA                                         Internet Message Control Protocol

DNS             53                                          Domain Name System

NTP             123                                         Network Time Protocol

There are many other applications as well, these can be viewed at:

http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers (Exit to Wikipedia)

You should have a basic understanding of what the common applications do.  You should also be familiar with their port numbers.  We will cover many of these applications again at a later time.

If you'd like any of these applications explained in the meantime, let me know in the comments.