How does a bridge learn MAC addresses?

By sending ARP requests to discover MAC addresses

By querying a central MAC address database

By examining the destination MAC address of incoming frames

By examining the source MAC address of incoming frames

A network has three switches connected in a triangle (each switch connected to the other two). RSTP is enabled. A broadcast frame is sent by a host on switch A. How does RSTP affect the propagation of this broadcast frame?

RSTP drops the broadcast frame at the blocked port, preventing it from reaching some hosts.

RSTP converts the broadcast frame to a unicast frame to avoid looping.

RSTP allows the broadcast frame to traverse all three links, creating a loop that is broken by TTL.

RSTP blocks one of the redundant links, so the broadcast frame traverses the network without looping.

A switch receives a frame on port ge-0/0/1 with destination MAC 00:aa:bb:cc:dd:ee. The FDB has an entry for this MAC pointing to ge-0/0/1. What does the switch do?

It floods the frame out all ports except ge-0/0/1.

It drops the frame because the destination is on the same port as the source.

It forwards the frame out ge-0/0/1 because the destination is on that port.

It sends the frame to the CPU for further processing.

A network engineer is comparing a bridge to a router. Which statement correctly describes a key difference in how they handle traffic?

A bridge and a router both forward traffic based on IP addresses.

A bridge and a router both forward traffic based on MAC addresses.

A bridge forwards frames based on MAC addresses, while a router forwards packets based on IP addresses.

A bridge forwards packets based on IP addresses, while a router forwards frames based on MAC addresses.

Why is loop prevention necessary in a bridged network?

To prevent broadcast storms and MAC address instability

To allow multiple paths for load balancing

To reduce the number of MAC addresses in the forwarding database

To increase the speed of frame forwarding

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

Domain 1Objective 1

Bridging Components JN0-352 Practice Questions (Page 3)

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 15 practice questions to prepare you well beyond it. (estimate)

15questions here

3free pages

5concepts

Questions 11–15

11foundation · easy
How does a bridge learn MAC addresses?
Select an answer first
12expert · medium
A network has three switches connected in a triangle (each switch connected to the other two). RSTP is enabled. A broadcast frame is sent by a host on switch A. How does RSTP affect the propagation of this broadcast frame?
Select an answer first
13application · medium
A switch receives a frame on port ge-0/0/1 with destination MAC 00:aa:bb:cc:dd:ee. The FDB has an entry for this MAC pointing to ge-0/0/1. What does the switch do?
Select an answer first
14application · easy
A network engineer is comparing a bridge to a router. Which statement correctly describes a key difference in how they handle traffic?
Select an answer first
15foundation · easy
Why is loop prevention necessary in a bridged network?
Select an answer first

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