JNCIA-JUNOS Practice Test 11 — 15 Questions

Question 1

Refer to the exhibit. The router has three static routes configured. Which route will be used to forward a packet destined to 172.16.1.100?

Accepted Answer

The static route to 172.16.0.0/16. The router will use the most specific matching route for the destination 172.16.1.100. The static route to 172.16.0.0/16 has a prefix length of 16, which is more specific than the default route (0.0.0.0/0) and the route to 10.0.0.0/8 (which does not match the destination). Therefore, the route to 172.16.0.0/16 is selected based on the longest-prefix-match rule.

Answer

The default route (0.0.0.0/0)

Answer

The router will drop the packet.

Answer

The static route to 10.0.0.0/8

Question 2

Order the steps to reset the root password on a Junos device via the console.

Question 3

Arrange the steps to perform a system backup (snapshot) on a Junos device.

Question 4

Arrange the steps to configure a static route in Junos OS in the correct order.

Question 5

Order the steps to configure a user account with a password in Junos.

Question 6

Order the steps to configure a BGP peering session in Junos.

Question 7

Arrange the steps to configure a DHCP server on a Junos router.

Question 8

Which TWO statements are true about the 'show interfaces ge-0/0/0 extensive' command output?

Accepted Answer

It displays a detailed count of errors. The 'show interfaces ge-0/0/0 extensive' command in Junos OS provides a comprehensive view of the interface, including detailed error counters (e.g., CRC errors, frame errors, giants, runts) and traffic statistics (e.g., input/output bytes, packets, and rates). Option A is correct because the extensive output explicitly lists a detailed count of errors per interface, which is not available in the standard 'show interfaces' output. Option C is correct because traffic statistics such as unicast, multicast, and broadcast packets are included in the extensive output.

Answer

It includes only layer 1 information

Answer

It shows the interface configuration

Answer

It indicates the administrative status

Question 9

Which THREE route types are considered protocol-independent in Junos?

Accepted Answer

Direct routes. Direct, local, and static routes are considered protocol-independent because they are not learned or installed by any dynamic routing protocol. Direct routes are automatically created for directly connected interfaces, local routes represent the interface's own IP address, and static routes are manually configured by an administrator. These routes exist in the routing table regardless of whether any routing protocol is running, hence the term 'protocol-independent'.

Answer

BGP routes

Answer

OSPF routes

Question 10

Which TWO statements about active routes in the Junos routing table are correct?

Accepted Answer

An active route is installed in the forwarding table.. Option C is correct because an active route in Junos is one that is selected as the best route for a given prefix and is installed in the forwarding table (the FIB). The forwarding table is used by the Packet Forwarding Engine (PFE) to make actual forwarding decisions, so only active routes are placed there.

Answer

All routes in the routing table are active.

Answer

Multiple active routes can exist for the same prefix.

Answer

An active route is always preferred over a passive route.

Question 11

An administrator needs to ensure that traffic from the 192.168.1.0/24 subnet is allowed to reach the internet through a Juniper SRX firewall. The SRX is configured with security policies. Which policy element is required to permit this traffic?

Accepted Answer

Source zone. In Juniper SRX security policies, the source zone is a mandatory element that defines the origin of the traffic. Since the traffic originates from the 192.168.1.0/24 subnet, the policy must specify the source zone (e.g., 'trust' or 'internal') to match the incoming traffic and permit it toward the internet (destination zone, e.g., 'untrust'). Without a source zone, the policy cannot be applied to the correct traffic flow.

Answer

Source address

Answer

Application

Answer

Destination zone

Question 12

Match each Junos CLI operational mode command to its function.

Question 13

A Juniper device has multiple candidate configurations loaded. The administrator wants to discard all uncommitted changes and revert to the last committed configuration. Which command should be used?

Accepted Answer

rollback 0. Option A is correct because the 'rollback 0' command reverts the candidate configuration to the last committed configuration, discarding all uncommitted changes. In Junos, the rollback command uses a numeric index where 0 always refers to the most recently committed configuration, effectively undoing any uncommitted edits.

Answer

delete configuration

Answer

clear configuration

Answer

load override terminal

Question 14

An administrator is configuring a static route to a remote network 10.10.10.0/24 via next-hop 192.168.1.1. Which command correctly adds this route?

Accepted Answer

set routing-options static route 10.10.10.0/24 next-hop 192.168.1.1. Option D is correct because the Junos syntax for configuring a static route uses the hierarchy `set routing-options static route next-hop

`. The prefix must include the subnet mask in CIDR notation (e.g., /24). This command installs a route to 10.10.10.0/24 with next-hop 192.168.1.1 into the routing table.

Answer

set routing-options route 10.10.10.0/24 static next-hop 192.168.1.1

Answer

set routing-options static route 10.10.10.0 next-hop 192.168.1.1 mask 255.255.255.0

Answer

set routing-options static next-hop 192.168.1.1

Question 15

During a maintenance window, an engineer issues 'commit confirmed 5' but the change causes a connectivity loss. The engineer is unable to reconnect to the device before the timeout expires. What will happen?

Accepted Answer

The device automatically reverts to the previous active configuration.. The 'commit confirmed 5' command activates a candidate configuration and starts a 5-minute rollback timer. If the engineer does not issue a 'commit' or 'commit check' before the timer expires, Junos automatically reverts to the previously active configuration. This ensures the device returns to a known working state without manual intervention, preserving connectivity after the failed change.

Answer

The engineer must manually rollback using the rollback command.

Answer

The change remains committed until the next reboot.

Answer

The device reloads with factory defaults.

JNCIA-JUNOS Practice Test 11 — 15 Questions

Exhibit

JNCIA-JUNOS Practice Test 11 — 15 Questions

Exhibit