Port numbers

Q).  What is The A Port Number?

Ans).  A Port Number is allocated by the operating system (or can be requested) , in such a way to identify the pocess in a standalone system or a network.default Port Number for FTP is 21.

TelNet ---------- 23
SMTP ---------- 25
HTTP ---------- 80
HTTPS---------443
FTP ------------ 20,21
DNS -----------  53
TFTP ----------- 69
SNMP ----------161
RIP ------------- 520
IMAP 4--------- 143
IMAP 3 ---------220
RPC ------------ 135
LDAP ---------- 389
Net Stat -------- 15
SSH ------------ 22
RAP -----------  38
BGP -----------  179
WINS ---------- 42
BootP ---------- 67
DHCP ---------- 68
POP2 ----------  109
POP3 ----------  110
Net BIOS ------ 139
SQL Server ---- 1433
NFS ------------   2049