JN0-102 Practice Exam Free – 50 Questions to Simulate the Real Exam
Are you getting ready for the JN0-102 certification? Take your preparation to the next level with our JN0-102 Practice Exam Free – a carefully designed set of 50 realistic exam-style questions to help you evaluate your knowledge and boost your confidence.
Using a JN0-102 practice exam free is one of the best ways to:
- Experience the format and difficulty of the real exam
- Identify your strengths and focus on weak areas
- Improve your test-taking speed and accuracy
Below, you will find 50 realistic JN0-102 practice exam free questions covering key exam topics. Each question reflects the structure and challenge of the actual exam.
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
What is a route filter?
A. a list of prefixes that can be configured in a policy
B. a single prefix that is configured separately, and can be referenced in a policy
C. a list of prefixes that is configured separately and can be referenced in a policy
D. a single prefix that can be configured within a policy
Which of the following commands will configure the maximum transmission unit size of a fast Ethernet interface?
A. set interfaces fe-0/0/0 unit 0 ethernet-options mtu 1200
B. set interfaces fe-0/0/0 mtu 1200
C. set interfaces fe-0/0/0 unit 0 mtu 1200
D. set interfaces fe-0/0/0.0 mtu 1200
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
-- 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.
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.
For the interface ge-1/2/3.4, what does "ge" represent?
A. SONET/SDH
B. Gigabit Ethernet
C. Aggregated Ethernet
D. GRE
-- Exhibit -- [edit policy-options] user@router# show policy-statement block-routes { term 1 { from { route-filter 172.27.0.0/24 longer; } then reject; } term 2 { then accept; } } -- Exhibit -- You are asked to ensure that your device does not accept any prefixes within the 172.27.0.0/24 network. You have applied the policy shown in the exhibit, but the 172.27.0.0/24 route is still present on your device. Which configuration will resolve this problem?
A. [edit policy-options policy-statement block-routes] user@router# set term 1 from route-filter 172.27.0.0/24 orlonger
B. [edit policy-options policy-statement block-routes] user@router# set term 1 from route-filter 172.27.0.0/24 upto /30
C. [edit policy-options policy-statement block-routes] user@router# set term 2 from route-filter 172.27.0.0/24 longer
D. [edit policy-options policy-statement block-routes]
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]
What is the default action for firewall filters?
A. accept
B. reject
C. discard
D. log
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
-- 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.
Which information would you find using the CLI help function? (Choose two.)
A. message of the day
B. tip of the day
C. explanation for specific system log error messages
D. explanation for specific traceoptions log messages
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.
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
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
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
Which word starts a command to display the operational status of a Junos device?
A. put
B. set
C. show
D. get
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)
You have configuration groups applied on your router. Which command would you use to see all components of the interface hierarchy?
A. show configuration interfaces | display inheritance
B. show configuration interfaces | display changed
C. show configuration interfaces | display set
D. show configuration interfaces | display detail
-- 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.
-- 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.
Which command prompt indicates that you are in operational mode?
A. user@router&
B. user@router#
C. user@router%
D. user@router>
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
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.
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
Which command is used to load the rescue configuration?
A. load override rescue
B. rollback rescue
C. load replace rescue-configuration
D. rollback 49
-- Exhibit-- 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; } }
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
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
Which routing table stores IPv4 unicast routes and is used by multicast routing protocols to prevent loops?
A. inet.0
B. inet.1
C. inet.2
D. inet.3
-- 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
Which process is responsible for the routing protocols on a Junos device?
A. rpd
B. mgd
C. dcd
D. chassisd
You accidentally configured interface so-0/0/0.0 with /32 instead of /30. Which two solutions could you use to correct this configuration? (Choose two.)
A. [edit interfaces so-0/0/0.0] user@router# replace family inet address /32 with /30
B. [edit interfaces so-0/0/0.0] user@router# rename family inet address /32 to address /30
C. [edit] user@router# replace interface so-0/0/0.0 family inet address /32 with address /30
D. [edit interfaces so-0/0/0.0] user@router# delete family inet address
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
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
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.
-- Exhibit -- [edit routing-options] user@router# show static { defaults { metric 10; preference 10; } route 10.10.10.0/24 { next-hop 192.168.100.1; qualified-next-hop 192.168.200.1; preference 6; } metric 8; } } -- Exhibit -- Given the configuration shown in the exhibit, which statement is correct about traffic matching the route 10.10.10.0/24?
A. It will be forwarded to 192.168.100.1 using a metric of 10.
B. It will be forwarded to 192.168.100.1 using a metric of 8.
C. It will be forwarded to 192.168.200.1 using a metric of 8.
D. It will be forwarded to 192.168.200.1 using a metric of 10.
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.
-- 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
What must you type to enter operational mode from the root@% command prompt?
A. exit
B. configure
C. edit
D. cli
-- 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.
Which interface type connects the control and forwarding planes on an MX Series device?
A. fxp1
B. fxp0
C. me0
D. ae1
-- Exhibit -- [edit policy-options] user@router# show policy-statementpolicyABC { term A { from { protocol rip; route-filter 192.168.1.0/24 longer; } then accept; } } [edit protocols ospf] user@router# show exportpolicyABC; area 0.0.0.0 { interface ge-0/0/0.0; interface lo0.0; } -- Exhibit -- Referring to the exhibit, which two statements are true? (Choose two.)
A. The route 192.168.1.0/25 is accepted.
B. The route 192.168.2.0/24 is accepted.
C. OSPF routes will be exported into RIP.
D. RIP routes will be exported into OSPF.
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
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
Random early detection (RED) is associated with which class of service component?
A. classification
B. policing
C. queuing
D. scheduling
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
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.
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.
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