What does a switch do when it receives a frame with a destination MAC address that is not in its MAC address table?

Adds the destination MAC to its table and forwards to the source port

Floods the frame out all ports except the ingress port

Sends the frame to the default gateway

A switch port is configured as a trunk port. What is the default behavior for untagged frames received on this port?

They are tagged with the native VLAN ID.

They are assigned to the native VLAN.

They are forwarded on all VLANs.

An administrator wants to increase bandwidth between two switches and provide redundancy if one link fails. The switches support LACP. What is the best approach?

Configure multiple physical links as an aggregated link using LACP.

Configure the links as access ports in the same VLAN.

Enable STP on the links to load-balance traffic.

Use a single higher-speed link instead of multiple links.

A switch has just been powered on and its MAC address table is empty. Host A sends a frame to Host B, which is on the same VLAN but on a different port of the switch. How does the switch handle this frame?

It forwards the frame only to the port where Host B is connected, based on the destination MAC address.

It floods the frame out all ports except the ingress port, and when Host B replies, it records Host B's MAC address in the table.

It sends the frame to the router because the destination is on a different subnet.

It drops the frame because the destination MAC address is not in the MAC address table.

Juniper NetworksCertified Associate, Data Center

Domain 2Objective 1

Ethernet Switching and Bridging Concepts JN0-281 Practice Questions (Page 5)

Part of the Layer 2 Switching and VLANs domain, which makes up ~21% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~7–13 in this domain), expect 1–2 from this objective — we provide 29 practice questions to prepare you well beyond it. (estimate)

29questions here

6free pages

8concepts

Questions 21–25

21foundation · easy
What does a switch do when it receives a frame with a destination MAC address that is not in its MAC address table?
Select an answer first
22application · medium
A switch port is configured as a trunk port. What is the default behavior for untagged frames received on this port?
Select an answer first
23foundation · easy
Which type of port is used to carry frames from multiple VLANs between switches?
Select an answer first
24application · medium
An administrator wants to increase bandwidth between two switches and provide redundancy if one link fails. The switches support LACP. What is the best approach?
Select an answer first
25application · medium
A switch has just been powered on and its MAC address table is empty. Host A sends a frame to Host B, which is on the same VLAN but on a different port of the switch. How does the switch handle this frame?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to JN0-281

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Juniper Networks. “JN0-281” is a trademark of its owner, used for identification only.