Danh sách các Port thông dụng
POP2 109
POP3 110
POP3s 995
FTP 20, 21
TFTP 69 UDP
SMTP 25
SMTPs 465
SNMP 161
NNTP 119
NNTPs 563
DHCP 67,68 UDP
DNS 53 UDP/TCP
HTTP 80
HTTPs 443
IMAP 143
IMAP4 585
IMAPs 993
TELNET 23
PROXY 8080
20 TCP File Transfer - FTP data
21 TCP File Transfer - FTP control
22 TCP/UDP SSH Remote Login Protocol/ pcAnywhere
23 TCPTelnet
25 TCP Simple Mail Transfer Protocol (SMTP)
38 TCP UDP Route Access Protocol (RAP)
42 UDP Host Name Server - Microsoft WINS
45 TCP Message Processing Module (receive)
46 TCP Message Processing Module (send)
50 TCP UDP Remote Mail Checking Protocol (RMCP)
66 TCP UDP Oracle SQL*NET
69 TCP UDP Trivial File Transfer Protocol (TFTP)
88 TCP UDP Kerberos Network Authentication Service
101 TCP UDP Network Information Center (NIC) Hostname Server
110 TCP UDP Post Office Protocol (POP) Version 3
118 TCP UDP SQL Services
119 TCP UDP Network News Transfer Protocol
130 TCP UDP Cisco FNATIVE
143 TCP UDP Internet Message Access Protocol (IMAP) Mail Server
161 TCP UDP SNMP
211 TCP UDP Texas Instruments 914C/G Terminal
280 TCP UDP http-mgmt
314 TCP UDP Opalis Robot
333 TCP UDP Texar Security Port
742 TCP UDP Network Revision Control System
747 TCP UDP Fujitsu Device Control
749 TCP UDP Kerberos Administration
767 TCP UDP Phonebook
777 TCP UDP Multiling HTTP
800 TCP UDP MDBS Daemon, Remotely Possible (Remote Control)
989 TCP UDP FTP Data Over TLS/SSL
990 TCP UDP FTP Control Over TLS/SSL
991 TCP UDP Netnews Administration System
992 TCP UDP Secure Telnet (over TLS/SSL)
993 TCP UDP Secure IMAP4 (over TLS/SSL)
994 TCP UDP Secure IRC (over TLS/SSL)
995 TCP UDP Secure POP3 (over TLS/SSL)
996 TCP Vsinet / Central Point Software Xtree License Server
chỉ số đơn vị đo lường
1 Bit = Binary Digit (số nhị phân)
1 byte = 8 Bit
1 Kilobyte(KB) = 1.024B
1 Megabyte(MB) = 1.048.576B =1000Kb
1 Gigabyte(GB) = 1.073.741.824B =1000Mb
1 Terabyte(TB) = 1.099.511.627.776B =1000Gb (1 nghìn GB, hay bằng 1 nghìn chiếc USB 1GB)
1 Petabyte(PB) = 1.125.899.906.842.624B =1000Tb (1 nghìn TB , = 1000 ổ USB TB)
1 Exabyte(EB) = 1.152.921.504.606.846.976B =1000Pb ( 1 triệu ổ USB 1TB)
1 Zettabyte(ZB)= 1.180.591.620.717.411.303.424B =1000Eb (1 tỷ ổ USB 1 TB)
1 Yottabyte(YB)= 1.208.925.819.614.629.174.706.176B =1000Zb (1000 tỷ ổ USB 1 TB)
1 KHz = 1 000 Hz
1 MHz = 1 000 KHz
1GHz = 1 000 MHz
