JUNIPER NETWORKS CERTIFIED ASSOCIATE (JNCIA-JUNOS) EXAM
PRACTICE QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALE Q&A INSTANT DOWNLOAD PDF
140 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Analyze and troubleshoot Junos forwarding and routing table behavior in complex multi-protocol
environments
2 Evaluate the impact of policy, firewall filters, and security zones on traffic flow and device performance
3 Design and validate Junos configurations for high availability, including GRES, NSR, and BFD
4 Apply advanced Junos operational commands and logic to diagnose and resolve network issues
5 Juniper Networks Certified Associate
6 JNCIA
7 Junos
8 Exam Practice Questions And Correct Answers
9 Verified Answers
10 Plus Rationale Q&A Instant Download Pdf
11 Foundations of Juniper Networks Certified Associate (JNCIA-Junos)
12 Applied Juniper Networks Certified Associate (JNCIA-Junos)
13 Advanced Juniper Networks Certified Associate (JNCIA-Junos)
14 Juniper Networks Certified Associate (JNCIA-Junos) Review
Page 1
,Q1 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
In a Junos router running both OSPF and BGP, which statement accurately
describes the default preference values and their impact on route selection when
the same prefix is learned via both protocols?
A. OSPF internal routes (preference 10) are preferred over BGP routes (preference 170)
regardless of metric. CORRECT
B. BGP routes (preference 170) are preferred over OSPF internal routes (preference 10)
because BGP has a higher administrative distance.
C. The route with the lower metric is chosen, regardless of protocol preference.
D. The route with the higher local preference is chosen, as local preference overrides
preference.
RATIONALE: In Junos, the route preference (administrative distance) is the first tie-breaker in the
route selection process. OSPF internal routes have a default preference of 10, while BGP routes
have a default preference of 170. Lower preference values are preferred, so OSPF routes win
over BGP for the same prefix, regardless of metric. Local preference is a BGP attribute
considered only among BGP routes, and metric is only compared within the same protocol.
Q2 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
A network administrator applies the following firewall filter to an interface: `term 1
{ from { source-address 192.168.1.0/24; } then accept; } term 2 { then count; }` This
filter is applied as an input filter. What is the effect on traffic from 192.168.1.0/24
that is destined to the router itself?
A. All traffic from 192.168.1.0/24 is accepted, and no traffic is counted.
B. Traffic from 192.168.1.0/24 is accepted, and all other traffic is silently discarded.
C. Traffic from 192.168.1.0/24 is accepted, and all other traffic is counted but still processed
normally. CORRECT
D. Traffic from 192.168.1.0/24 is accepted, and all other traffic is counted and then dropped.
RATIONALE: In Junos, firewall filter terms are evaluated in order. Term 1 matches traffic from
192.168.1.0/24 and accepts it, so it is not evaluated further. Term 2 has no match conditions, so
it matches all other traffic and only counts it (no discard action). Since the filter is input, the
default action after all terms is to accept, so non-matching traffic is counted and then processed
normally. Therefore, traffic from 192.168.1.0/24 is accepted uncounted, and all other traffic is
counted and still forwarded.
Page 2
,Q3 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
Which statement about Junos's handling of configuration changes is correct?
A. The `commit` command activates the candidate configuration and makes it the active
configuration immediately, but it can be rolled back using `rollback`.
B. The `commit confirmed` command automatically rolls back to the previous configuration if not
confirmed within the specified time, but only if the new configuration fails.
C. The `load override` command replaces the entire candidate configuration with the contents of
a file, but the change is not active until a `commit` is issued. CORRECT
D. The `commit synchronize` command is used on multi-chassis systems to commit
configurations on both nodes simultaneously, but it requires the `commit` command to be issued
on each node separately.
RATIONALE: In Junos, configuration changes are staged in the candidate configuration. The
`load override` command replaces the entire candidate configuration with the contents of a
specified file, but these changes are not applied to the active configuration until a `commit` is
issued. The `commit` command activates the candidate configuration, and `rollback` is used to
revert to a previous configuration. `commit confirmed` automatically rolls back after a timeout if
the commit is not confirmed, but it is not conditional on failure. `commit synchronize` is used on
dual Routing Engines to commit on both REs simultaneously, but it is issued once from one RE.
Page 3
, Q4 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
In a Junos device with two Routing Engines, which statement about graceful
Routing Engine switchover (GRES) is true?
A. GRES requires both Routing Engines to have identical configurations, and the standby RE
maintains the same forwarding state as the active RE. CORRECT
B. GRES is enabled by default on all dual-RE platforms and requires no additional configuration.
C. GRES allows the standby RE to take over without disrupting the forwarding plane, but it does
not preserve the control plane state such as OSPF adjacencies.
D. GRES is only supported on virtual chassis and requires the `graceful-switchover` command to
be configured on both REs.
RATIONALE: GRES enables a switchover to the standby RE without interrupting forwarding. For
GRES to work, both REs must have identical configurations, and the standby RE must be fully
synchronized with the active RE's forwarding state. GRES is not enabled by default; it must be
configured. GRES preserves the kernel and forwarding state, but it does not preserve the control
plane protocol state (e.g., OSPF adjacencies) unless combined with NSR or graceful restart.
GRES is supported on dual-RE platforms, not specifically virtual chassis.
Q5 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
Which Junos operational command displays the active configuration that is
currently running on the device?
A. show configuration | display set
B. show configuration CORRECT
C. show configuration | display inheritance
D. show configuration | compare
RATIONALE: The `show configuration` command displays the active configuration that is
currently running on the device. `show configuration | display set` displays the same active
configuration in set command format, but the base command is still `show configuration`. `show
configuration | display inheritance` shows inherited configuration, and `show configuration |
compare` compares the candidate configuration with the active configuration. Thus, the correct
answer is `show configuration`.
Page 4
PRACTICE QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALE Q&A INSTANT DOWNLOAD PDF
140 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Analyze and troubleshoot Junos forwarding and routing table behavior in complex multi-protocol
environments
2 Evaluate the impact of policy, firewall filters, and security zones on traffic flow and device performance
3 Design and validate Junos configurations for high availability, including GRES, NSR, and BFD
4 Apply advanced Junos operational commands and logic to diagnose and resolve network issues
5 Juniper Networks Certified Associate
6 JNCIA
7 Junos
8 Exam Practice Questions And Correct Answers
9 Verified Answers
10 Plus Rationale Q&A Instant Download Pdf
11 Foundations of Juniper Networks Certified Associate (JNCIA-Junos)
12 Applied Juniper Networks Certified Associate (JNCIA-Junos)
13 Advanced Juniper Networks Certified Associate (JNCIA-Junos)
14 Juniper Networks Certified Associate (JNCIA-Junos) Review
Page 1
,Q1 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
In a Junos router running both OSPF and BGP, which statement accurately
describes the default preference values and their impact on route selection when
the same prefix is learned via both protocols?
A. OSPF internal routes (preference 10) are preferred over BGP routes (preference 170)
regardless of metric. CORRECT
B. BGP routes (preference 170) are preferred over OSPF internal routes (preference 10)
because BGP has a higher administrative distance.
C. The route with the lower metric is chosen, regardless of protocol preference.
D. The route with the higher local preference is chosen, as local preference overrides
preference.
RATIONALE: In Junos, the route preference (administrative distance) is the first tie-breaker in the
route selection process. OSPF internal routes have a default preference of 10, while BGP routes
have a default preference of 170. Lower preference values are preferred, so OSPF routes win
over BGP for the same prefix, regardless of metric. Local preference is a BGP attribute
considered only among BGP routes, and metric is only compared within the same protocol.
Q2 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
A network administrator applies the following firewall filter to an interface: `term 1
{ from { source-address 192.168.1.0/24; } then accept; } term 2 { then count; }` This
filter is applied as an input filter. What is the effect on traffic from 192.168.1.0/24
that is destined to the router itself?
A. All traffic from 192.168.1.0/24 is accepted, and no traffic is counted.
B. Traffic from 192.168.1.0/24 is accepted, and all other traffic is silently discarded.
C. Traffic from 192.168.1.0/24 is accepted, and all other traffic is counted but still processed
normally. CORRECT
D. Traffic from 192.168.1.0/24 is accepted, and all other traffic is counted and then dropped.
RATIONALE: In Junos, firewall filter terms are evaluated in order. Term 1 matches traffic from
192.168.1.0/24 and accepts it, so it is not evaluated further. Term 2 has no match conditions, so
it matches all other traffic and only counts it (no discard action). Since the filter is input, the
default action after all terms is to accept, so non-matching traffic is counted and then processed
normally. Therefore, traffic from 192.168.1.0/24 is accepted uncounted, and all other traffic is
counted and still forwarded.
Page 2
,Q3 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
Which statement about Junos's handling of configuration changes is correct?
A. The `commit` command activates the candidate configuration and makes it the active
configuration immediately, but it can be rolled back using `rollback`.
B. The `commit confirmed` command automatically rolls back to the previous configuration if not
confirmed within the specified time, but only if the new configuration fails.
C. The `load override` command replaces the entire candidate configuration with the contents of
a file, but the change is not active until a `commit` is issued. CORRECT
D. The `commit synchronize` command is used on multi-chassis systems to commit
configurations on both nodes simultaneously, but it requires the `commit` command to be issued
on each node separately.
RATIONALE: In Junos, configuration changes are staged in the candidate configuration. The
`load override` command replaces the entire candidate configuration with the contents of a
specified file, but these changes are not applied to the active configuration until a `commit` is
issued. The `commit` command activates the candidate configuration, and `rollback` is used to
revert to a previous configuration. `commit confirmed` automatically rolls back after a timeout if
the commit is not confirmed, but it is not conditional on failure. `commit synchronize` is used on
dual Routing Engines to commit on both REs simultaneously, but it is issued once from one RE.
Page 3
, Q4 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
In a Junos device with two Routing Engines, which statement about graceful
Routing Engine switchover (GRES) is true?
A. GRES requires both Routing Engines to have identical configurations, and the standby RE
maintains the same forwarding state as the active RE. CORRECT
B. GRES is enabled by default on all dual-RE platforms and requires no additional configuration.
C. GRES allows the standby RE to take over without disrupting the forwarding plane, but it does
not preserve the control plane state such as OSPF adjacencies.
D. GRES is only supported on virtual chassis and requires the `graceful-switchover` command to
be configured on both REs.
RATIONALE: GRES enables a switchover to the standby RE without interrupting forwarding. For
GRES to work, both REs must have identical configurations, and the standby RE must be fully
synchronized with the active RE's forwarding state. GRES is not enabled by default; it must be
configured. GRES preserves the kernel and forwarding state, but it does not preserve the control
plane protocol state (e.g., OSPF adjacencies) unless combined with NSR or graceful restart.
GRES is supported on dual-RE platforms, not specifically virtual chassis.
Q5 ANALYZE AND TROUBLESHOOT JUNOS FORWARDING AND ROUTING TABLE BEHAVIOR
IN COMPLEX MULTI-PROTOCOL ENVIRONMENTS
Which Junos operational command displays the active configuration that is
currently running on the device?
A. show configuration | display set
B. show configuration CORRECT
C. show configuration | display inheritance
D. show configuration | compare
RATIONALE: The `show configuration` command displays the active configuration that is
currently running on the device. `show configuration | display set` displays the same active
configuration in set command format, but the base command is still `show configuration`. `show
configuration | display inheritance` shows inherited configuration, and `show configuration |
compare` compares the candidate configuration with the active configuration. Thus, the correct
answer is `show configuration`.
Page 4
