Top 100+ Port Numbers Interview Questions And Answers
Question 1. What Is A Port Number?
Answer :
A port number is a part of the addressing data used to discover the senders and receivers of messages. Port numbers are most typically used with TCP/IP connections. Home community routers and pc software program paintings with ports and sometimes will let you configure port number settings. These port numbers permit exceptional programs at the same computer to percentage network sources simultaneously.
Question 2. What Is The Range Of Ports Or How Many Ports Are There?
Answer :
Port numbers can range from 0 to 65535, so general we will get 65536 ports.
Networking Interview Questions
Question three. Why Port Numbers Are Just 65536?
Answer :
This is because dilemma in TCP/IP stacks wherein the port field is simply sixteen bit length. So we get handiest 2^16 port that's same to 65536 ports.
Port numbers have a range of zero…65535 (although regularly zero has special which means). In the original BSD TCP implementation, most effective root can bind to ports 1…1023, and dynamically assigned ports have been assigned from the variety 1024…5000; the others had been available for unprivileged static project. These days 1024…5000 is regularly not sufficient dynamic ports, and IANA has now officially specified the range 49152...65535 for dynamic port assignment. However even that isn't enough dynamic ports for a few busy servers, so the range is usually configurable (by way of an administrator). On current Linux and Solaris systems (frequently used as servers), the default dynamic range now begins at 32768. Mac OS X and Windows Vista default to 49152...65535.
Question four. What Is The Well-recognized Ports?
Answer :
Well known ports are from zero to 1023(overall 2^10=1024 ports).
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Question 5. What Is The Registered Ports, And (range: 1024 To 49151)?
Answer :
Used by particular service upon programs along with Oracle database listener (1521), Mysql (3306), Microsoft Terminal server (3389) and so on.
CCNA Interview Questions
Question 6. What Is The Dynamic And/or Private Ports. (range: 49152 To 65535)?
Answer :
These ports can’t be registered by means of IANA. This is used for custom or transient functions and for automated allocation of short-lived (or ephemeral) ports that's used internally by utility/methods. You can see these ports by way of going for walks ‘netstat’ command below “Local cope with” column.
Question 7. What Do You Mean By Default Port?
Answer :
Default port is a delegated port for specific well-known server.
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Question 8. Can We Change Default Port For A Service (instance Apache, Squid)?
Answer :
Yes, we will alternate.
Question 9. What Is The Protocol Numbers For Tcp And Udp?
Answer :
TCP protocol number:6
UDP protocol wide variety: 17
Active Directory Interview Questions
Question 10. How To Find Which Ports Are Open?
Answer :
You can locate the ports on your linux server with the nmap command:
#netstat -ntlp
and n -> display the host through numbers
t ->suggests tcp protocols
u ->to check udp protocols
l ->listening ports
p -> presentations which system controls the port
