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JN0-102 Mock Test Free

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  • JN0-102 Mock Test Free – 50 Realistic Questions to Prepare with Confidence.
  • Access Full JN0-102 Mock Test Free

JN0-102 Mock Test Free – 50 Realistic Questions to Prepare with Confidence.

Getting ready for your JN0-102 certification exam? Start your preparation the smart way with our JN0-102 Mock Test Free – a carefully crafted set of 50 realistic, exam-style questions to help you practice effectively and boost your confidence.

Using a mock test free for JN0-102 exam is one of the best ways to:

  • Familiarize yourself with the actual exam format and question style
  • Identify areas where you need more review
  • Strengthen your time management and test-taking strategy

Below, you will find 50 free questions from our JN0-102 Mock Test Free resource. These questions are structured to reflect the real exam’s difficulty and content areas, helping you assess your readiness accurately.

Question 1

What is a valid multicast MAC address?

A. 00:90:69:9f:ea:46

B. ff:ff:ff:ff:ff:ff

C. 01:00:5e:28:12:95

D. 99:99:99:99:99:99

 


Suggested Answer: C

 

Question 2

The authentication order configuration on your M120 includes the settings tacplus and radius (in that order), but does not include the password parameter. You attempt to log in to the device, but the network containing the authentication servers is currently down.
Which statement is true about your login attempt?

A. The login attempt is rejected.

B. The login attempt is automatically accepted after the authentication servers timeout value is reached, since there are no other authentication methods available.

C. The M120 automatically tries authenticating locally on the device after the authentication servers’ timeout value is reached.

D. The M120 automatically tries authenticating locally on the device before using external authentication.

 


Suggested Answer: C

 

Question 3

-- Exhibit --
[edit interfaces ge-0/0/6]
user@router# show
unit 0 {
familyinet {
address 172.16.10.100/24;
address 172.16.10.101/24;
}
}
-- Exhibit --
You have two IP addresses configured on the ge-0/0/6 interface, as shown in the exhibit. You want to select the 172.16.10.101 address as the source address for packets sent from this interface to hosts on a remote subnet.
Which parameter would you add to the 172.16.10.101 address to complete this task?

A. preferred

B. broadcast

C. primary

D. arp 172.16.10.101

 


Suggested Answer: A

 

Question 4

-- Exhibit --
[edit policy-options]
user@router# show
policy-statement my-policy {
term 1 {
from {
route-filter 172.27.0.0/24 longer;
}
}
then reject;
}
-- Exhibit --
Which statement is correct about the policy shown in the exhibit?

A. All routes are accepted.

B. All routes are rejected.

C. A 172.27.0.0/24 route will be accepted.

D. A 172.27.0.0/16 route will be accepted.

 


Suggested Answer: B

 

Question 5

-- Exhibit --
firewall {
filter select-telnet {
term 1 {
from {
source-address {
10.0.0.0/8;
}
}
then log;
}
term 2 {
from {
protocoltcp;
port telnet;
}
then {
syslog;
reject;
}
}
term 3 {
from {
source-address {
10.1.1.1/32;
}
protocoltcp;
port telnet;
}
then {
sample;
accept;
}
}
}
}
-- Exhibit --
A Telnet session is initiated from host 10.1.1.1.
What will happen when it is processed by the firewall filter shown in the exhibit?

A. The packet will be accepted and logged.

B. The packet will be discarded and logged.

C. The packet will be rejected and a syslog message generated.

D. The packet will be accepted and sampled.

 


Suggested Answer: A

 

Question 6

You are asked to configure real-time performance monitoring (RPM) between two Junos devices to track traffic in your network.
Which two application traffic types can you track? (Choose two.)

A. ICMP

B. SNMP

C. TCP

D. HTTPS

 


Suggested Answer: AC

 

Question 7

What are three characteristics of Layer 2 switches? (Choose three.)

A. Layer 2 switches forward broadcast traffic.

B. Layer 2 switches forward traffic addresses to hosts that reside on the same collision domain.

C. Layer 2 switches separate multicast domains.

D. Layer 2 switches separate collision domains.

E. Layer 2 switches forward traffic addressed to hosts that reside on a different collision domain.

 


Suggested Answer: ABD

 

Question 8

Which two statements are correct regarding default protocol preference values? (Choose two.)

A. RIP is preferred over OSPF external routes.

B. Direct, local, and static routes have the same preference value.

C. OSPF’s preference value is lower than BGP.

D. OSPF has a single preference value for both internal and external routes.

 


Suggested Answer: AC

 

Question 9

Which command will delete the current rescue configuration?

A. user@router# system delete configuration rescue

B. user@router> request system configuration rescue delete

C. user@router# delete rescue configuration

D. user@router> file delete rescue-configuration

 


Suggested Answer: B

Community Answer: B

 

Question 10

-- Exhibit --
user@router> restart
^
unknown command.
-- Exhibit --
You are investigating routing problems on a device running the Junos OS. You receive the error shown in the exhibit when you attempt to restart the routing process.
Which statement describes the problem?

A. You have typed an invalid command.

B. You must be in configuration mode to restart the routing process.

C. You do not have permission to restart the routing process.

D. You must wait until close of business to restart the routing process, based on user-defined policy.

 


Suggested Answer: C

 

Question 11

-- Exhibit
 Image
-- Exhibit --
Referring to the exhibit, you are asked to rate-limit traffic from Web-Server to the subnet where Mal-User is located. All other traffic should be permitted.
Which firewall filter configuration do you use?

A. [edit firewall] user@router# show policer LIMIT-MAL-USER { if-exceeding { bandwidth-limit 400k; burst-size-limit 100k; } then discard; } familyinet { filter STOP-MAL-USER { term one { from { source-address { 100.100.100.10/32; } destination-address { 200.200.200.0/24; } } thenpolicer LIMIT-MAL-USER; } term two { then accept; } } }

B. [edit firewall] user@router# show policer LIMIT-BAD-USER { if-exceeding { bandwidth-limit 400k; burst-size-limit 100k; } then discard; } familyinet { filter STOP-MAL-USER { term one { from { source-address { 100.100.100.10/32; } destination-address { 200.200.200.0/24; } } thenpolicer LIMIT-MAL-USER; } term two { then accept; } } }

C. [edit firewall] user@router# show policer LIMIT-MAL-USER { if-exceeding { bandwidth-limit 400k; burst-size-limit 100k; } then discard; } familyinet { filter STOP-MAL-USER { term one { from { source-address { 100.100.100.10/32; } destination-address { 200.200.200.0/24; } } thenpolicer LIMIT-MAL-USER; } term two { then reject; } } }

D. [edit firewall] user@router# show policer LIMIT-MAL-USER { if-exceeding { bandwidth-limit 400k; burst-size-limit 100k; } then discard; } familyinet { filter STOP-MAL-USER { term one { from { source-address { 200.200.200.0/24; } destination-address { 100.100.100.10/32; } } thenpolicer LIMIT-MAL-USER; } term two { then accept; } }

 


Suggested Answer: A

 

Question 12

-- Exhibit --
user@router> show configuration firewall
familyinet {
filter demo {
term example {
from {
source-address {
100.100.100.0/24;
}
destination-address {
200.200.200.0/24;
}
}
then {
reject;
}
}
term testing {
from {
source-address {
10.10.10.0/28;
}
destination-address {
200.200.200.0/24;
}
}
then sample;
}
term results {
from {
address {
200.200.200.0/24;
}
}
then accept;
}
term final {
thenpolicer LAPD;
}
}
}
-- Exhibit --
Given the configuration shown in the exhibit, what will happen to traffic from source 10.10.10.25 destined to 200.200.200.1?

A. The traffic will be rejected.

B. The traffic will be dropped.

C. The traffic will be forwarded.

D. The traffic will be policed.

 


Suggested Answer: C

 

Question 13

-- Exhibit --
[edit routing-options]
user@router# show
static {
route 0.0.0.0/0 {
next-hop 10.1.1.1;
qualified-next-hop 10.1.1.254 {
preference 4;
}
}
}
-- Exhibit --
Assuming both paths shown in the exhibit are available, which statement is correct?

A. Traffic matching the default route will use 10.1.1.1 as the next hop.

B. Traffic matching the default route will use 10.1.1.254 as the next hop.

C. Traffic matching the default route will be load-balanced per packet across both next hops.

D. Traffic matching the default route will be load-balanced per flow across both next hops.

 


Suggested Answer: B

 

Question 14

Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?

A. 2001::1::cbff:2:0001/64

B. 2001::1000::cbff:20:1/64

C. 2001:0:1000::cbff:20:1/64

D. 2001:0:1:0:0:cbff:2:1/64

 


Suggested Answer: C

 

Question 15

Which two commands may be used when configuring an IP address for a Gigabit Ethernet interface? (Choose two.)

A. set interfaces ge-0/0/0.0 address 10.1.1.1/24

B. set interfaces ge-0/0/0.0 family inet address 10.1.1.1/24

C. set interfaces ge-0/0/0 unit 0 family inet address 10.1.1.1/24

D. set interfaces ge-0/0/0 address 10.1.1.1/24

 


Suggested Answer: BC

 

Question 16

Which two statements are true about TCP communication? (Choose two.)

A. The receiver acknowledges the final packet in each communications stream.

B. The receiver adds sequencing numbers to the packets received.

C. The sender adds sequencing numbers to the packets it sends.

D. The receiver acknowledges each packet it receives from the sending device.

 


Suggested Answer: AC

Community Answer: CD

 

Question 17

What are two valid match criteria for a routing policy? (Choose two.)

A. OSPF area ID

B. prefix list

C. port

D. time-to-live (TTL)

 


Suggested Answer: AB

 

Question 18

-- Exhibit --
user@router> show route
inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.10.10.91/32     *[Direct/0] 00:09:40
>via lo0.0
10.10.10.92/32     *[OSPF/10] 00:01:50, metric 1
>to 172.16.1.2 via ge-0/0/2.0
100.100.1.0/24     *[Static/5] 00:01:50
Reject -
172.16.1.0/24      *[Direct/0] 00:06:09
>via ge-0/0/2.0
172.16.1.1/32      *[Local/0] 00:06:09
Local via ge-0/0/2.0 -
192.168.0.0/16     *[Aggregate/130] 00:00:06
Reject -
192.168.0.0/17     *[Aggregate/130] 00:00:06
>to 172.16.1.2 via ge-0/0/2.0
192.168.50.0/24    *[Static/5] 00:00:06
>to 172.16.1.2 via ge-0/0/2.0
192.168.51.0/24    *[Static/5] 00:00:06
>to 172.16.1.2 via ge-0/0/2.0
user@router> show configuration policy-options
policy-statement demo {
term 1 {
from {
route-filter 192.168.0.0/16 longer accept;
}
then reject;
}
}
user@router> show configuration protocols ospf
export demo;
area 0.0.0.0 {
interface ge-0/0/2.0;
}
-- Exhibit --
Given the configuration and routing table shown in the exhibit, which routes will be advertised to OSPF neighbors because of the demo policy?

A. 192.168.0.0/16 only

B. 192.168.0.0/17 only

C. 192.168.50.0/24 and 192.168.51.0/24

D. 192.168.0.0/17, 192.168.50.0/24, and 192.168.51.0/24

 


Suggested Answer: D

Community Answer: C

 

Question 19

Which command prompt indicates that you are in operational mode?

A. user@router&

B. user@router#

C. user@router%

D. user@router>

 


Suggested Answer: D

 

Question 20

-- Exhibit --
user@router> show configuration
groups {
ge-int {
interfaces {
 {
unit 0 {
familyinet {
address 10.10.12.1/24;
}
}
}
}
}
}
...
interfaces {
ge-0/0/1 {
unit 0;
}
-- Exhibit --
Referring to the exhibit, which two actions would you take to only apply the 10.10.12.1/24 address to the ge-0/0/1.0 interface?

A. Apply the ge-int group to the configuration at the [edit] hierarchy.

B. Apply the ge-int group to the configuration at the [edit interfaces ge-0/0/1] hierarchy.

C. Apply the ge-int group to the configuration at the [edit interfaces ge-0/0/1 unit 0] hierarchy.

D. Apply the ge-int group to the configuration at the [edit interfaces] hierarchy.

 


Suggested Answer: BC

 

Question 21

The IP address 10.1.1.1 belongs to which class of IP address space?

A. Class A

B. Class B

C. Class C

D. Class D

 


Suggested Answer: A

 

Question 22

Which process is responsible for the routing protocols on a Junos device?

A. rpd

B. mgd

C. dcd

D. chassisd

 


Suggested Answer: A

 

Question 23

Random early detection (RED) is associated with which class of service component?

A. classification

B. policing

C. queuing

D. scheduling

 


Suggested Answer: D

 

Question 24

Which command will display the temperature of the Routing Engine's CPU?

A. show chassis environment

B. show chassis routing-engine

C. show chassis temperatures

D. show chassis status

 


Suggested Answer: B

The output fields for theshow chassis routing-engine command include:
* Temperature: Temperature of the air flowing past the Routing Engine.

Question 25

What are two Junos processes? (Choose two.)

A. OSPF SPF daemon (ospfd)

B. SNMP daemon (snmpd)

C. BGP daemon (bgpd)

D. Routing protocols daemon (rpd)

 


Suggested Answer: BD

 

Question 26

What are three acceptable modifiers to a terminating action of a firewall filter? (Choose three.)

A. Policer

B. Count

C. Syslog

D. Log

E. Discard

 


Suggested Answer: ABD

 

Question 27

Which word starts a command to display the operational status of a Junos device?

A. put

B. set

C. show

D. get

 


Suggested Answer: C

 

Question 28

Which statement is true about the routing table?

A. The routing table exists in the control plane only.

B. The routing table exists in the control plane and in the forwarding plane.

C. The routing table contains both active and inactive routes.

D. The routing table is stored on compact flash.

 


Suggested Answer: A

 

Question 29

Which Junos release would address only bug fixes that were not contained in the 15.1R1 version of code?

A. 15.1R2

B. 15.1X2

C. 15.1S2

D. 15.1F2

 


Suggested Answer: A

 

Question 30

What must you type to enter operational mode from the root@% command prompt?

A. exit

B. configure

C. edit

D. cli

 


Suggested Answer: D

 

Question 31

At which layer of the OSI model does error checking occur with IPv6?

A. Layer 2

B. Layer 3

C. Layer 4

D. Layer 7

 


Suggested Answer: C

 

Question 32

At which command prompt would you issue the set date  command?

A. [edit chassis] user@router#

B. [edit] user@router#

C. [edit system] user@router#

D. user@router>

 


Suggested Answer: D

 

Question 33

Which command will display the active configuration?

A. user@router> show configuration

B. user@router# show

C. user@router> show system configuration

D. user@router> show system commit

 


Suggested Answer: A

 

Question 34

What is the default action for firewall filters?

A. accept

B. reject

C. discard

D. log

 


Suggested Answer: C

Community Answer: A

 

Question 35

Which command would you use to view interface usage details in real time?

A. show interfaces terse

B. show interfaces extensive

C. monitor interface traffic

D. monitor traffic interface

 


Suggested Answer: C

 

Question 36

What is a valid IPv6 address?

A. 00:05:85:23:45:67

B. 127.0.0.1

C. 2001:0db8:3000:2215:0000:0000:aaaa:1111

D. 49.0001.0192.0168.1001.00

 


Suggested Answer: C

 

Question 37

What are two valid actions for a routing policy? (Choose two.)

A. discard

B. next policy

C. accept

D. ignore

 


Suggested Answer: BC

 

Question 38

Which two commands would you use to view OSPF routes? (Choose two.)

A. show ip route ospf

B. show ospf routes

C. show route protocol ospf

D. show route

 


Suggested Answer: CD

 

Question 39

You have configured a firewall filter with a single term matching on packets with a source address in the 10.0.0.0/24 subnet. This term only includes the count action.
Which two statements are true about traffic evaluated by this firewall filter? (Choose two.)

A. Packets outside the 10.0.0.0/24 subnet will be accepted.

B. Packets outside the 10.0.0.0/24 subnet will be rejected.

C. Packets outside the 10.0.0.0/24 subnet will be counted.

D. Packets outside the 10.0.0.0/24 subnet will not be counted.

 


Suggested Answer: BD

 

Question 40

-- Exhibit --
user@router> show route protocol static
inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
99.0.0.0/17        *[Static/5] 00:00:11
>to 10.1.1.2 via ge-0/0/1.0
99.0.0.0/19        *[Static/5] 00:00:11
>to 10.1.2.2 via ge-0/0/2.0
99.0.0.0/24        *[Static/5] 00:00:11
>to 10.1.3.2 via ge-0/0/3.0
99.0.0.0/26        *[Static/5] 00:00:11
>to 10.1.4.2 via ge-0/0/4.0
-- Exhibit --
In the exhibit, there are four static routes that route traffic through different interfaces.
Which interface does the router use if traffic is sent to the 99.0.0.1 destination?

A. ge-0/0/1

B. ge-0/0/2

C. ge-0/0/3

D. ge-0/0/4

 


Suggested Answer: D

 

Question 41

What are three characteristics of UDP? (Choose three.)

A. UDP is faster than TCP.

B. UDP operates at the Transport Layer.

C. UDP is connection-oriented.

D. UDP data is sent best-effort.

E. UDP is more reliable than TCP.

 


Suggested Answer: ABD

 

Question 42

How do you save the current candidate configuration in the set format to permanent storage media?

A. [edit] user@router# show | set | save /var/tmp/current.conf

B. [edit] user@router# show | compare set | save /var/tmp/current.conf

C. [edit] user@router# save /var/tmp/current.conf | display set

D. [edit]

 


Suggested Answer: D

 

Question 43

Which two statements are correct about the request system zeroize local command? (Choose two.)

A. The command removes all data files.

B. The command preserves the management interface addresses.

C. The command resets all key values.

D. The command removes all user-created files from the system.

 


Suggested Answer: CD

 

Question 44

For the interface ge-1/2/3.4, what does "ge" represent?

A. SONET/SDH

B. Gigabit Ethernet

C. Aggregated Ethernet

D. GRE

 


Suggested Answer: B

 

Question 45

You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router.
How do you undo all these changes?

A. rollback 2

B. rollback 1

C. rollback 0

D. rollback 3

 


Suggested Answer: A

 

Question 46

What is the network ID address of the IPv4 subnet that includes the IP address 114.180.192.120/28?

A. 114.180.192.100/28

B. 114.180.192.118/28

C. 114.180.192.112/28

D. 114.180.192.106/28

 


Suggested Answer: C

 

Question 47

What is the central processing component of the forwarding plane?

A. PFE

B. RE

C. Junos OS

D. forwarding table

 


Suggested Answer: A

 

Question 48

What does the command show | compare rollback 1 display?

A. the difference between the current candidate configuration and the candidate configuration from one commit ago

B. the difference between the current active configuration and the current candidate configuration

C. the difference between the current active configuration and the active configuration from one commit ago

D. the difference between the current candidate configuration and the archived configuration from one commit ago

 


Suggested Answer: D

Community Answer: C

 

Question 49

What is the network address for the 10.13.147.100/19 host?

A. 10.13.128.0

B. 10.13.147.0

C. 10.13.0.0

D. 10.13.100.0

 


Suggested Answer: A

 

Question 50

Which command is used to load the rescue configuration?

A. load override rescue

B. rollback rescue

C. load replace rescue-configuration

D. rollback 49

 


Suggested Answer: B

Community Answer: A

 

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