Question

Lewis has been hired as an assistant to the head network administrator. He needs to understand the basic functioning of certain STP (Spanning Tree Protocol) features that will block BPDUs (Bridge Protocol Data Units) on any port serving network hosts. Which of the following will he use for such purposes?1. A BPDU guard2. A BPDU filter3. A root guard4. A root bridge

Answer 1

Lewis will use a BPDU filter to block BPDUs on any port serving network hosts. A BPDU guard and a root guard serve different purposes related to the protection and management of the network topology.

Step-by-step explanation:

Lewis will use a BPDU filter to block BPDUs on any port serving network hosts. A BPDU (Bridge Protocol Data Unit) is a frame exchanged between switches to determine the root bridge and construct the spanning tree topology. By enabling a BPDU filter on a port, Lewis can prevent the switch from sending or receiving BPDUs on that port, effectively blocking any STP features related to BPDUs.

A BPDU guard, on the other hand, is used to enforce the presence of BPDUs on designated switch-to-switch ports and protect the network topology. A root guard ensures that a designated switch does not switch to the root bridge role in the STP, preventing any unauthorized switches from becoming the root bridge.

It's important for Lewis to understand the different STP features and their functionalities to effectively manage and secure the network infrastructure.

Answer 2

Lewis will use a BPDU filter for the purpose of blocking BPDUs on any port serving network hosts.

A BPDU filter is a Spanning Tree Protocol (STP) feature that can be used to prevent Bridge Protocol Data Units (BPDUs) from being sent or received on specific ports. BPDUs are essential for STP to work properly as they are used for the exchange of information between network switches to determine the network topology and prevent loops.

In certain scenarios such as when you want to isolate a port serving network hosts from STP operations, you can use a BPDU filter to effectively block BPDUs on that port. This can be useful for security or performance reasons, ensuring that the port remains dedicated to host traffic without participating in STP calculations.

Therefore, the Option 2 is correct.