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
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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