A network has multiple VLANs and redundant links between switches. The technician notices that STP is blocking a port in VLAN 10 but not in VLAN 20 on the same link. What is the most likely explanation?

The native VLAN is different on the two switches

STP runs per VLAN, so the root bridge and port states can differ between VLANs

The link is an EtherChannel, and STP treats it as one link

Port security is blocking VLAN 10

What action does a switch perform when it receives a frame on a port and the source MAC address is already present in its MAC address table but associated with a different port?

It sends an ARP request to verify the correct port

It keeps the original entry and ignores the new source port

It updates the MAC address table entry to reflect the new port

It drops the frame because the MAC address is already known

How does a switch use MAC addresses to make forwarding decisions?

It compares the destination MAC address to entries in its MAC address table to determine the egress port

It uses the IP address in the frame header to determine the egress port

It uses the source MAC address to determine the best path to the destination

It broadcasts the frame to all ports and lets the destination device respond

What is a characteristic of cut-through switching mode?

It buffers the frame to ensure proper VLAN tagging

It checks the frame for errors before forwarding

It waits for the entire frame to be received before forwarding

It begins forwarding the frame as soon as the destination MAC address is read

A technician enables port security on a switch port with a maximum of two MAC addresses. A third device is connected, and the port immediately goes into an error-disabled state. What is the most likely reason?

The port security violation mode is set to shutdown

The switch is not learning MAC addresses

The port is configured as a trunk

CiscoCertified Field Technician (CCT)

Domain 1Objective 4

1.4 Describe Network Switching and Layer 2 Technologies 800-150 Practice Questions (Page 5)

Part of the 1.0 Networking Foundations domain, which accounts for 20% of the 800-150 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~10–16 in this domain), expect 1–2 from this objective — we provide 27 practice questions to prepare you well beyond it. (estimate)

27questions here

6free pages

8concepts

20%of the exam

Questions 21–25

21expert · hard
A network has multiple VLANs and redundant links between switches. The technician notices that STP is blocking a port in VLAN 10 but not in VLAN 20 on the same link. What is the most likely explanation?
Select an answer first
22foundation · easy
What action does a switch perform when it receives a frame on a port and the source MAC address is already present in its MAC address table but associated with a different port?
Select an answer first
23foundation · easy
How does a switch use MAC addresses to make forwarding decisions?
Select an answer first
24foundation · easy
What is a characteristic of cut-through switching mode?
Select an answer first
25application · medium
A technician enables port security on a switch port with a maximum of two MAC addresses. A third device is connected, and the port immediately goes into an error-disabled state. What is the most likely reason?
Select an answer first

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