ICND1 LAN Switching Technologies 4

Question 1

A trunk link between two switches carries VLANs 1–100. Which command restricts it to carry only VLANs 10, 20, and 30?

Accepted Answer

switchport trunk allowed vlan 10,20,30

Answer

The 'switchport trunk allowed vlan' command specifies which VLANs are permitted to traverse the trunk.

Question 2

Which STP port role carries the best path toward the root bridge on a non-root switch?

Accepted Answer

Root port

Answer

Each non-root switch has one root port, which is the port with the lowest-cost path to the root bridge.

Question 3

What does the 'switchport mode dynamic desirable' command cause the port to do?

Accepted Answer

Actively attempt to form a trunk using DTP

Answer

'Dynamic desirable' causes the port to actively send DTP frames to negotiate a trunk with the neighbor.

Question 4

Which feature prevents a non-root switch port from immediately transitioning to forwarding when it first connects, avoiding temporary loops?

Accepted Answer

Spanning Tree Protocol

Answer

STP's listening and learning states introduce a delay before forwarding to ensure a loop-free topology is established.

Question 5

Two switches are connected with an EtherChannel bundle. Which load-balancing method uses both source and destination MAC addresses?

Accepted Answer

src-dst-mac

Answer

The 'src-dst-mac' load-balancing method hashes both source and destination MAC addresses to select the active link.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test