A network administrator is troubleshooting intermittent flooding in a large VLAN. The MAC address table shows that entries for several workstations are being removed and re-learned frequently. The administrator suspects the aging timer is too short. Which action would best address the issue?

Disable MAC learning on the ports.

A MAC address entry in a switch's forwarding table has not been used for a period of time. What happens to this entry?

It is moved to a separate static table

It is marked as invalid but remains in the table

It is permanently retained until the switch is rebooted

It is removed from the table after the aging timer expires

What is the primary reason a switch floods an unknown unicast frame?

To prevent loops in the network

To reduce network congestion by spreading traffic

To ensure the frame reaches its intended destination

To allow the switch to learn the destination MAC address

A switch receives a tagged frame on a trunk port with VLAN ID 50. The switch forwards the frame out another trunk port. How does the switch handle the VLAN tag?

It preserves the original 802.1Q tag

It adds an additional tag to the frame

It removes the tag before forwarding the frame

It replaces the tag with a new VLAN ID

A switch receives a frame on port ge-0/0/2. The destination MAC address is not present in the MAC address table. What is the switch's default forwarding behavior?

Send the frame to the switch's CPU for processing

Flood the frame out all ports except ge-0/0/2

Drop the frame because the destination is unknown

Forward the frame out port ge-0/0/2 only

Juniper NetworksCertified Specialist, Enterprise Routing and Switching (JNCIS-ENT)

Domain 1Objective 2

Frame Processing JN0-352 Practice Questions (Page 1)

Part of the Layer 2 Switching and VLANs domain, which makes up ~15% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~5–9 in this domain), expect 1–1 from this objective — we provide 22 practice questions to prepare you well beyond it. (estimate)

22questions here

5free pages

7concepts

Questions 1–5

1expert · medium
A network administrator is troubleshooting intermittent flooding in a large VLAN. The MAC address table shows that entries for several workstations are being removed and re-learned frequently. The administrator suspects the aging timer is too short. Which action would best address the issue?
Select an answer first
2foundation · easy
A MAC address entry in a switch's forwarding table has not been used for a period of time. What happens to this entry?
Select an answer first
3foundation · easy
What is the primary reason a switch floods an unknown unicast frame?
Select an answer first
4foundation · easy
A switch receives a tagged frame on a trunk port with VLAN ID 50. The switch forwards the frame out another trunk port. How does the switch handle the VLAN tag?
Select an answer first
5foundation · easy
A switch receives a frame on port ge-0/0/2. The destination MAC address is not present in the MAC address table. What is the switch's default forwarding behavior?
Select an answer first

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