NE NE Switching 2

Question 1

What is an inter-VLAN routing method that uses a single trunk link between a router and a switch?

Accepted Answer

Router-on-a-stick

Answer

Router-on-a-stick uses subinterfaces on the router, each associated with a VLAN, to route traffic between VLANs over one physical trunk link.

Question 2

Which Cisco proprietary protocol dynamically manages VLAN configuration across multiple switches?

Accepted Answer

VTP (VLAN Trunking Protocol)

Answer

VTP propagates VLAN database changes from a VTP server to all switches in the same VTP domain, reducing manual configuration.

Question 3

What is the native VLAN in 802.1Q trunking?

Accepted Answer

The VLAN whose frames are sent untagged across the trunk

Answer

The native VLAN (default VLAN 1) sends and receives untagged frames on 802.1Q trunks; mismatched native VLANs can cause security issues.

Question 4

What does RSTP (802.1w) provide compared to traditional STP (802.1D)?

Accepted Answer

Faster convergence by introducing new port roles and states

Answer

RSTP reduces convergence time from 30–50 seconds to near-zero by introducing Alternate and Backup port roles and eliminating the Listening state.

Question 5

What is the function of PortFast in Cisco STP implementations?

Accepted Answer

It allows access ports connected to end devices to skip STP listening and learning states

Answer

PortFast immediately transitions an access port to the Forwarding state, avoiding the typical 30-second STP delay for end device connections.

NE - Network Engineer Practice Test