A switch has learned that MAC address 00:11:22:33:44:55 is on port ge-0/0/1. A frame arrives on port ge-0/0/2 with source MAC 00:11:22:33:44:55. What does the switch do?

It drops the frame because the MAC address is already known.

It floods the frame out all ports because the MAC address has moved.

It updates the MAC address table to associate the MAC with port ge-0/0/2.

It sends an error message to the network administrator.

Which protocol is commonly used to negotiate and manage link aggregation between switches?

OSPF (Open Shortest Path First)

DHCP (Dynamic Host Configuration Protocol)

LACP (Link Aggregation Control Protocol)

An administrator is troubleshooting a connectivity issue and captures a frame on a trunk port. The frame has a VLAN tag of 0x8100. What does this indicate?

The frame is untagged and belongs to the native VLAN.

The frame is tagged with 802.1Q VLAN information.

A switch has a MAC address table with an entry for MAC 00:11:22:33:44:55 on port ge-0/0/1. A frame arrives on port ge-0/0/2 with destination MAC 00:11:22:33:44:55. What does the switch do?

It updates the MAC table to associate the MAC with ge-0/0/2.

It floods the frame out all ports except ge-0/0/2.

It drops the frame because the source and destination are on different ports.

It forwards the frame out port ge-0/0/1.

Juniper NetworksCertified Associate, Data Center

Domain 2Objective 1

Ethernet Switching and Bridging Concepts JN0-281 Practice Questions (Page 1)

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 1–5

1application · medium
A switch has learned that MAC address 00:11:22:33:44:55 is on port ge-0/0/1. A frame arrives on port ge-0/0/2 with source MAC 00:11:22:33:44:55. What does the switch do?
Select an answer first
2foundation · easy
Which protocol is commonly used to negotiate and manage link aggregation between switches?
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3application · medium
An administrator is troubleshooting a connectivity issue and captures a frame on a trunk port. The frame has a VLAN tag of 0x8100. What does this indicate?
Select an answer first
4foundation · easy
Which type of MAC address is used to send a frame to a specific single device on the network?
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5expert · medium
A switch has a MAC address table with an entry for MAC 00:11:22:33:44:55 on port ge-0/0/1. A frame arrives on port ge-0/0/2 with destination MAC 00:11:22:33:44:55. What does the switch do?
Select an answer first

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