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Are you a CCNA looking to refresh your Ninja Networking Skills? Are you studying to become Juniper Certified? Have fun with this quiz involving the TCP/IP and OSI models, routers versus switches, and collision versus broadcast domains!

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JNCIA-Junos OSI and Things That Use It Quiz

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This quiz hits the TCP/IP and OSI Models, routers and switches, and the concept of collision domains and broadcast domains. Enjoy!

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Question 1

Which of the following statements are correct regarding broadcast versus collision domains? Choose all that apply.

A	A VLAN permits a broadcast domain to scale across multiple physical devices
B	Broadcast frames are first sent to a gateway device, and then propagated to all other devices in the segment
C	Broadcasts are always constrained to a single physical network device, hubs are an exception
D	Broadcasts are sent using a special broadcast address that all stations "listen on"

Question 1 Explanation:

Remember, while network devices can constrain broadcasts, VLANs used across switches can actually ensure that broadcast frames are propagated across switches.

Question 2

You have a Juniper switch that contains three VLANs. Which statement is true about this device?

A	The switch will always flood broadcast frames between the three VLANs
B	The switch will flood a broadcast into the same VLAN where it was created
C	A router is used to flood the broadcast frame into all of the VLANs
D	Each VLAN requires the same default gateway configured for proper inter-VLAN communication

Question 2 Explanation:

One of the purposes of the VLAN is to constrain broadcast traffic to the single VLAN.

Question 3

A hub is still being used in a network run by a very nostalgic engineer. He has connected two servers and four workstations to this device. How many collision domains are there?

A	Four
B	Six
C	One
D	Two

Question 3 Explanation:

Remember, the challenge with a hub is one large collision domain for all the connected devices. This requires a half duplex configuration of the devices, and results in collisions in the network.

Question 4

Which are elements you can expect should there be a collision in your Ethernet network? Choose two.

A	A jam signal
B	A retransmission by the default gateway
C	A central arbitrator intervention
D	A retransmission after a random backoff

Question 4 Explanation:

CSMA/CD uses a jam signal to notify devices of a collision as well as a random backoff timer to control retransmissions.

Question 5

You have a Juniper router connected to the Internet and two switches. Each switch connects to five hosts. How many collision domains exist in this network?

A	11
B	12
C	1
D	13

Question 5 Explanation:

There is a collision domain created in this topology between each network device. 1 for the Internet connection. 2 for the two connections to the switches, and ten collision domains for each of the hosts.

Question 6

Segments are the PDU for which layer of the OSI model?

A	Physical
B	Transport
C	Network
D	Data Link

Question 6 Explanation:

From the bottom up - it is Bits, Frames, Packets, Segments.

Question 7

Which layer of the TCP/IP model ensures that packets are routed to logical addresses?

A	Host-to-Network
B	Data Link
C	Internet
D	Application
E	Transport

Question 7 Explanation:

The Internet layer is the equivalent of the Network layer in the OSI model.

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JNCIA-Junos OSI and Things That Use It Quiz

The CCENT (ICND1) Exam Cram!

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