What is meant by port blocking within LAN ?

Showing Answers 1 - 17 of 17 Answers

Niranjan Arsid

  • May 15th, 2006

Restricting the users from accessing a set of services within the local area network is called port blocking.


  • Jun 23rd, 2006

blocked port wont be able to forward frames to avoid loop

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  • Nov 1st, 2006

port blocking within LAN is not giving access to forward his request .

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  • Dec 2nd, 2006

Basically port blocking means we want to stop the transmission of network flow. It belongs to many matters in vlan we can do it for stop the frames to transmits forward . In network security , application security , NAT etc. there are lots of areas where we can use port blocking.


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puneet chawla

  • Nov 4th, 2007

Port blocking is stopping the source to not to access the destination node via ports as application works on the ports so ports are blocked to restricts the access  filling up the security holes in the network infrastructure.

blocking can be performed on the firewall & on a router itself via an ex. Acl.

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  • Dec 9th, 2007

Restricting packet flow via specific ports. Usage--limit and/or control accessibility/availabilitry to/of  specific services/resources. Good example: see CISCO (P)VLAN-ing...

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  • Apr 1st, 2008

Generally port blocking (here its logical ports) meant that blocking the particular port(s) in a gateway level to avoid the access from outside world.
 But Port blocking (here its physical ports) is bit differs in LAN segment. In LAN, port blocking means blocking the physical ports like USB, removable devices, floppy, DVD/CD-ROM, Windows Mobile PDAs and smartphones and transferred via COM and LPT ports, FireWire, PCMCIA, WiFi and Bluetooth adapters and many other plug-and-play devices. 

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  • Oct 14th, 2009

Port blocking has a lot to do with your firewall.  There are many different ports to your computer that you may or may not know about. Your 80 port is the one that does most of your internet work, port 22 is the FTP port of File Transfer Protocol.  This port is less secure than your 80 port. So port blocking with in your Local Area Network help prevents unwanted thing entering your computer.  You request information from the internet, it responds and send the appropriate data back.  People seeking to do damage to your computer send requests, if you're not asking for anything your firewall will stop that request and protect. However, there are those different ports that are less secure as mentioned before.

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  • May 24th, 2011


Port blocking is possible if Switch is installed in LAN,Port blocking to particular port is possible only if Switch is installed in LAN.A particular port can be blocked by configuring Switch under configuration mode in Interface Fast Ethernet (Switch Conf-if#int Fa0/1;One can block particular port on this configuration).

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  • Sep 11th, 2012

how to block local area network , all user not deney and open any user

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  • Oct 29th, 2015

Port blocking is a security feature available in switch using switch port security.

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  • Feb 23rd, 2016

My question is "Why local LAN port are automatically block and I need reason"

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  • Nov 27th, 2016

Hi...Suppose in your network you have enabled DHCP service... So if an anonymous user came with a laptop and connect the LAN cable then he will get IP from DHCP and can access network resource... so to avoid that port security was in place... if gets mis-matched with the mac address, then the switch will make the port shut... so the user wont get IP...

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Mahendra Chandanshive

  • Dec 1st, 2016

As per my understanding port blocking in LAN is something to restrict unauthorized persons who wants to use organizations network. Ports of Switches are by default enable to use, that means just plug and play in that situation we can use port blocking mechanism by using switchport security. If unknown person trying to connect his device on switch port that time switch will detect automatically (Using MAC address of that device) unknown device trying to use network then port automatically goes down.

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  • Jan 20th, 2017

Port Blocking within LAN caused by STP to prevent loops in network.

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  • Feb 23rd, 2018

port blocking means it is avoiding the loop in a network

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