How does a switch learn the MAC address of a device connected to one of its ports?

By examining the source MAC address of incoming frames

By sending ARP requests to all devices

By examining the destination MAC address of incoming frames

A company has two departments, Sales and Engineering, each with their own switch. They want to isolate broadcast traffic between the departments but still allow them to communicate through a router. What is the most efficient way to achieve this?

Create separate VLANs for Sales and Engineering on both switches, and connect the switches with a trunk port carrying both VLANs.

Configure each switch with a single VLAN and connect them with a trunk port.

Use a single VLAN but configure access control lists on the switch ports to block broadcast traffic.

Connect the two switches with two separate links, one for each department, and use link aggregation.

What is the primary purpose of Spanning Tree Protocol (STP) in a switched network?

To prevent loops by blocking redundant paths

To provide encryption for data in transit

To increase the bandwidth between switches

What is the purpose of the preamble in an Ethernet frame?

To carry the source and destination MAC addresses

To indicate the length of the payload

To synchronize the receiver's clock before the frame data arrives

What is the primary benefit of dividing a network into VLANs?

Provides encryption for data in transit

Eliminates the need for IP addressing

Increases the number of MAC addresses a switch can learn

Reduces the size of broadcast domains

Juniper NetworksCertified Associate, Data Center

Domain 2Objective 1

Ethernet Switching and Bridging Concepts JN0-281 Practice Questions (Page 4)

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 16–20

16foundation · easy
How does a switch learn the MAC address of a device connected to one of its ports?
Select an answer first
17application · medium
A company has two departments, Sales and Engineering, each with their own switch. They want to isolate broadcast traffic between the departments but still allow them to communicate through a router. What is the most efficient way to achieve this?
Select an answer first
18foundation · easy
What is the primary purpose of Spanning Tree Protocol (STP) in a switched network?
Select an answer first
19foundation · easy
What is the purpose of the preamble in an Ethernet frame?
Select an answer first
20foundation · easy
What is the primary benefit of dividing a network into VLANs?
Select an answer first

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