ports number and protocols and there definiton

1. PORTS AND PROTOCOLS

2. TCP & PORT NO 6
 TRANSMISSSION CONTROL PROTOCOL
 Transmission control protocol (TCP) is a network
communication protocol designed to send data
packets over the Internet.
 It is connection oriented
 It as acknowledgement
 It has three handshake method
 It is reliable
 Slow data transformation

3. UDP & PORT NO 17
 USER DATAGRAM PROTOCOL
 UDP uses a simple connectionless
communication model with a minimum of protocol
mechanism.
 It as NO acknowledgement
 Unreliable
 fast data transformation

4. FTP & PORT NO 20/21
 File Transfer Protocol
 It used for the transfer of files between a client and
server on a computer network.
 FTP is often secured with SSL/TLS (FTPS) or
replaced with SSH File Transfer Protocol

5. SSH & PORT NO 22
 Secure Shell (SSH)
 By using it we can access with a console in secure
in SSH
 SSH was designed as a replacement for Telnet and
for unsecured plain text

6. TELNET & PORT NO 23
 Telnet provided access remote host to a command-
line interface of the system
 Telnet is unencrypt it send plain text over the
network, so it is vulnerable.
 SSH was designed as a replacement for Telnet

7. SMTP & & PORT NO 25
 Simple Mail Transfer Protocol
 It is used to transfer mail (email) from source to
destination between mail servers and it is used by
end users to send email to a mail system.
 SMTP uses port 25, but SSL/TLS encrypted SMTP
uses port 465

8. DNS & PORT NO 53
 Domain Name System
 DNS is used widely on the public internet and on
private networks to translate domain names into IP
addresses, typically for network routing.
 For example, the domain
name www.example.com translates to the
addresses 93.184.216.34 (IPv4) and
2606:2800:220:1:248:1893:25c8:1946 (IPv6).

9. DHCP & PORT NO 67/68
 Dynamic Host Configuration Protocol
 DHCP server can manage UDP/IP settings for
devices on a network, by automatically or
dynamically assigning IP addresses to the devices.
 The DHCP employs a connectionless service
model, using the User Datagram Protocol (UDP).
UDP port number 67 is the destination port of a
server, and UDP port number 68 is used by the
client.

10. HTTP & PORT NO 80
 Hypertext Transfer Protocol (HTTP)
 HTTP is the main protocol that is used by web
browsers and used by any client that uses files
located on these servers.

11. POP3 & PORT NO 110
 Post Office Protocol (POP) version 3
 POP was designed to be very simple by allowing a
client to retrieve the complete contents of a server
mailbox and then deleting the contents from the
server.
 POP3 uses port 110, but SSL/TLS encrypted POP
uses port 995.

12. NTP & PORT NO 123
 Network Time Protocol
 It is a networking protocol for clock synchronization
between computer systems over packet-switched.
 NTP uses UDP/IP packets for data transfer
because of the fast connection setup and response
times.

13. IMAP & PORT NO 143
 Internet Message Access Protocol
 IMAP version3 is the second of the main protocols
used to retrieve mail from a server.
 IMAP uses port 143, but SSL/TLS
encrypted IMAP uses port 993.

14. SNMP & PORT NO 161/162
 Simple Network Management Protocol
 SNMP is used by network administrators including
the ability to monitor, configure and control network
devices

15. HTTPS & PORT NO 443
 Hypertext Transfer Protocol Secure (HTTPS)
 It is an extension of the Hypertext Transfer
Protocol (HTTP) for secure communication over
a computer network.
 The protocol is therefore also often referred to
as HTTP over TLS or HTTP over SSL.

16. SMB & PORT NO 445
 Server Message Block
 It mainly used for shared information
like files, printers, and serial ports and
miscellaneous communications in a network.

17. RDP & PORT NO 3389
 Remote Desktop Protocol
 It user with a graphical interface to connect to
another computer over a network connection
 The user employs RDP client software for this
purpose, while the other computer must run RDP
server software

18.  SQL Server & PORT NO 1433
 Nessus scanner & PORT NO 8834
 ArcSight ESM & PORT NO 8443
 proxy Server & PORT NO 8080