NE NE Switching

Question 1

What is the default port cost for a 1 Gbps link in IEEE 802.1D Spanning Tree Protocol?

Accepted Answer

19

Answer

IEEE 802.1D assigns a cost of 19 to 1 Gbps links, used by STP to determine the best path to the root bridge.

Question 2

In STP, what is the role of the Root Bridge?

Accepted Answer

It serves as the reference point for all STP path calculations in the network

Answer

The Root Bridge is the STP reference point; all switches calculate their best path (lowest cost) toward the root bridge to build a loop-free topology.

Question 3

Which STP port state forwards frames and learns MAC addresses?

Accepted Answer

Forwarding

Answer

Only ports in the Forwarding state both learn MAC addresses and pass user data frames.

Question 4

What does the 'show mac address-table' command display on a Cisco switch?

Accepted Answer

Dynamically learned and static MAC-to-port mappings

Answer

The MAC address table maps learned MAC addresses to the switch ports they were learned on, enabling frame forwarding decisions.

Question 5

What is the purpose of VLAN trunking using 802.1Q?

Accepted Answer

To carry traffic from multiple VLANs over a single physical link by tagging frames

Answer

802.1Q inserts a 4-byte tag into Ethernet frames to identify VLAN membership, allowing multiple VLANs to traverse one trunk link.

NE - Network Engineer Practice Test

NE - Network Engineer Practice Test

NE NE Switching