Network+ Guide to Networks (MindTa...

8th Edition
Jill West + 2 others
Publisher: Cengage Learning
ISBN: 9781337569330



Network+ Guide to Networks (MindTa...

8th Edition
Jill West + 2 others
Publisher: Cengage Learning
ISBN: 9781337569330
Chapter 10, Problem 16RQ
Textbook Problem

Why is a BPDU filter needed at the demarc?

Program Plan Intro


  • STP stands for Spanning Tree Protocol is used to builds a loop-free logical topology that used for Ethernet networks.
  • Preventing bridge loops and the broadcast radiation are the basic function of STP.
  • It calculates paths which avoids potential loops and artificially blocks the links that would complete a loop.
  • If a switch is removed, STP will re-calculate the best loop-free data paths among the remaining switches.
  • The BPDU (Bridge Protocol Data Units) is used by STP for transmitting information between switches.
    • The BPDU guard blocks BPDUs on any port serving network hosts.
    • The BPDU filter disables STP on particular ports.

Internet Service Provider (ISP):

  • An organization that provides access to the internet and related services to individual users and businesses is known as Internet Service Provider.
  • Internet Service Provider accesses the internet through phone, cable, DSL (Digital Subscriber Line), satellite, or fiber optic lines for a charge.
  • Internet Service Provider’s other name is Internet Access Provider.
  • Internet Service Provider offers services like Internet access, Internet transit, Domain name registration, Hosting and many such.
  • Internet Service Provider has been designed for different categories such as Personal, Business, School, Non-profit, Politics, Military/Private, Sports and many others.

Explanation of Solution

 BPDU filter:

  • The BPDU filter disables STP on particular ports, such as the port leading to the network demarc.
  • It prevents access to network links which should not be considered when plotting STP paths in a network...

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