A switch has two VLANs: VLAN 10 and VLAN 20. A PC in VLAN 10 sends a unicast frame to a PC in VLAN 20. The switch's MAC address table has an entry for the destination PC on port 5, which is in VLAN 20. What does the switch do?

Floods the frame to all ports in VLAN 10

Forwards the frame to port 5 because the MAC address is in the table

Drops the frame because the destination is in a different VLAN

Sends the frame to the router for inter-VLAN routing

A network administrator wants to block a specific device from sending traffic on the network, but the device's IP address changes frequently. The administrator knows the device's MAC address. What should the administrator use to block the device?

An access control list based on the device's IP address.

VLAN segmentation to isolate the device.

Port security to limit the number of MAC addresses on the port.

MAC address filtering to deny the device's MAC address.

What is the primary purpose of MAC address filtering on a switch port?

To improve the speed of the switch's forwarding decisions

To reduce collisions on the network segment

To prevent unauthorized devices from connecting to the network

To allow the switch to route between VLANs

A company wants to prevent a specific device from accessing the network, but the device's MAC address is not known. The device is currently connected to the network. Which approach would allow the administrator to identify the device's MAC address?

Check the switch's MAC address table to find the port and MAC address of the device.

Use VLANs to isolate the device and then block the entire VLAN.

Use MAC address filtering with a deny list for all unknown MACs.

Enable port security on all ports to block unknown devices.

A switch has a MAC address filter that denies a specific source MAC address. A frame from that MAC address arrives at the switch. What does the switch do with the frame?

Floods the frame to all ports except the ingress port

Adds the MAC address to the table and forwards normally

Forwards the frame only to the default gateway

CiscoCertified Support Technician (CCST) Networking

Domain 4Objective 5

4.5. Explain Basic Switching Concepts. 100-150 Practice Questions (Page 5)

Part of the Infrastructure domain, which makes up ~18% of our current practice bank. Cisco does not publish an official question count, but from its 50-minute exam (~20–35 total, ~4–6 in this domain), expect 1–1 from this objective — we provide 32 practice questions to prepare you well beyond it. (estimate)

32questions here

7free pages

3concepts

Questions 21–25

21expert · hard
A switch has two VLANs: VLAN 10 and VLAN 20. A PC in VLAN 10 sends a unicast frame to a PC in VLAN 20. The switch's MAC address table has an entry for the destination PC on port 5, which is in VLAN 20. What does the switch do?
Select an answer first
22application · medium
A network administrator wants to block a specific device from sending traffic on the network, but the device's IP address changes frequently. The administrator knows the device's MAC address. What should the administrator use to block the device?
Select an answer first
23foundation · easy
What is the primary purpose of MAC address filtering on a switch port?
Select an answer first
24expert · medium
A company wants to prevent a specific device from accessing the network, but the device's MAC address is not known. The device is currently connected to the network. Which approach would allow the administrator to identify the device's MAC address?
Select an answer first
25application · medium
A switch has a MAC address filter that denies a specific source MAC address. A frame from that MAC address arrives at the switch. What does the switch do with the frame?
Select an answer first

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