ACSP VLANs, Spanning Tree Protocol & Layer 2 Technologies

Question 1

What is the primary function of VLANs?

Accepted Answer

Answer

VLANs (Virtual Local Area Networks) are used to logically segment a single physical network into multiple broadcast domains. This primary function allows administrators to group devices based on function, department, or application, regardless of their physical location. Network segmentation improves security by isolating traffic and reduces the size of broadcast domains, enhancing network efficiency.

Question 2

What does the Spanning Tree Protocol (STP) prevent?

Accepted Answer

Answer

The Spanning Tree Protocol (STP) is a Layer 2 network protocol designed to prevent bridge loops in Ethernet networks. In redundant network topologies, where multiple paths exist between switches, loops can cause broadcast storms and MAC address table instability. STP works by intelligently blocking redundant paths, ensuring there is only one active path between any two network segments while still providing redundancy in case of a link failure.

Question 3

Which layer does Spanning Tree Protocol operate on?

Accepted Answer

Answer

The Spanning Tree Protocol (STP) operates at Layer 2 of the OSI model, which is the Data Link Layer. This layer is responsible for node-to-node data transfer and error detection. STP functions by exchanging Bridge Protocol Data Units (BPDUs) between switches to determine the network topology and block redundant paths, all based on MAC addresses and switch port states, not IP addresses.

Question 4

What is a key benefit of using VLANs in a network?

Accepted Answer

Answer

A key benefit of using VLANs in a network is enhanced security. By segmenting the network into separate broadcast domains, VLANs isolate traffic between different user groups or device types. This prevents unauthorized access to sensitive resources and contains security breaches within a specific VLAN, limiting their impact on the entire network.

Question 5

How does STP determine the root bridge?

Accepted Answer

Answer

STP determines the root bridge by comparing the Bridge ID (BID) of all switches in the network. The Bridge ID is a combination of a configurable bridge priority (defaulting to 32768) and the switch's MAC address. The switch with the lowest Bridge ID is elected as the root bridge, serving as the central reference point for all Spanning Tree calculations.

Uncategorized Practice Test

Uncategorized Practice Test

ACSP VLANs, Spanning Tree Protocol & Layer 2 Technologies