A switch receives a frame from a PC with source MAC 00:11:22:33:44:55 on port 3. The switch's MAC address table already has an entry for that MAC on port 7. What does the switch do?

Keeps the entry on port 7 because it was learned first

Drops the frame because the MAC is already known

Floods the frame to all ports except port 3

Updates the entry to associate the MAC with port 3

A small office has a single 24-port switch connecting all PCs and printers. The office manager wants to reduce unnecessary broadcast traffic so that the accounting team's devices do not receive broadcasts from the sales team's devices. The switch is currently unconfigured. What should you do?

Enable MAC address filtering on the switch to block broadcast frames.

Create two VLANs and assign the accounting and sales devices to separate VLANs.

Replace the switch with a router to connect the teams.

Configure port security to limit the number of MAC addresses per port.

A small office has two unmanaged switches connected together. A user on port 1 of switch A sends a frame to a server connected to port 5 of switch B. The switch A MAC address table is empty. Which action does switch A take?

Add the destination MAC address to the table before forwarding

Send the frame only to the uplink port connecting to switch B

Drop the frame because the destination is on another switch

Flood the frame out all ports except the ingress port

A switch has just been rebooted and its MAC address table is empty. PC-A sends a frame to PC-B, which is connected to a different port on the same switch. What does the switch do with the frame?

Drops the frame because the destination MAC is unknown.

Forwards the frame only to PC-B's port after checking the MAC table.

Sends the frame to the router for routing.

Floods the frame out of all ports except the port where PC-A is connected.

A switch has a MAC address table that is full. A new device sends a frame to an unknown destination. What is the most likely behavior?

The switch learns the destination MAC and forwards directly

The switch drops the frame because the table is full

The switch sends the frame to the router

The switch floods the frame to all ports except the ingress port

CiscoCertified Support Technician (CCST) Networking

Domain 4Objective 5

4.5. Explain Basic Switching Concepts. 100-150 Practice Questions (Page 4)

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 16–20

16application · medium
A switch receives a frame from a PC with source MAC 00:11:22:33:44:55 on port 3. The switch's MAC address table already has an entry for that MAC on port 7. What does the switch do?
Select an answer first
17application · medium
A small office has a single 24-port switch connecting all PCs and printers. The office manager wants to reduce unnecessary broadcast traffic so that the accounting team's devices do not receive broadcasts from the sales team's devices. The switch is currently unconfigured. What should you do?
Select an answer first
18application · medium
A small office has two unmanaged switches connected together. A user on port 1 of switch A sends a frame to a server connected to port 5 of switch B. The switch A MAC address table is empty. Which action does switch A take?
Select an answer first
19application · medium
A switch has just been rebooted and its MAC address table is empty. PC-A sends a frame to PC-B, which is connected to a different port on the same switch. What does the switch do with the frame?
Select an answer first
20expert · hard
A switch has a MAC address table that is full. A new device sends a frame to an unknown destination. What is the most likely behavior?
Select an answer first

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