JNCIA-SEC Srx Series Service Gateways Practice Test 4 — 15 Questions

Question 1

You are troubleshooting an issue where an administrator cannot commit configuration changes on an SRX Series device because another user is currently editing the configuration. How do you resolve a configuration database lock caused by an idle or abandoned editing session?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Use the operational command 'clear system configuration database lock' (or force the commit).. The operational command 'clear system configuration database lock' or releasing the lock is used, or checking active edit sessions.

Answer

Switch to root user mode and kill all processes.

Answer

Reboot the device immediately.

Answer

Delete the configuration file from the Linux shell.

Question 2

You are configuring a vSRX Virtual Firewall in a private cloud. Which virtual interface type is typically used for management traffic in a vSRX deployment?

Accepted Answer

fxp0. In vSRX deployments, fxp0 (or ge-0/0/0 depending on the exact model version, but typically fxp0 for management) serves as the dedicated management interface.

Answer

st0

Answer

lo0

Answer

reth0

Question 3

An administrator configures security policies using logical systems (LSYS) on an enterprise SRX Series device. What is the primary benefit of deploying logical systems on an SRX gateway?

Accepted Answer

Logical systems partition a single physical SRX device into multiple virtual firewall instances with independent administrative domains, routing tables, and policies.. Logical systems allow partitioning a single SRX device into multiple virtual firewalls with independent routing tables, security policies, and administrative control.

Answer

Logical systems increase physical interface bandwidth by aggregating ports.

Answer

Logical systems accelerate IPsec encryption throughput.

Answer

Logical systems replace the need for high-availability clustering.

Question 4

An administrator configures source NAT with port address translation (PAT) on an SRX device. They notice that internal hosts are exhausting available source ports rapidly. Which CLI command or setting allows the administrator to monitor PAT pool port utilization and allocation?

Accepted Answer

show security nat source pool statistics. Monitoring PAT and NAT pool translation statistics is performed via 'show security nat source pool statistics'.

Answer

show chassis nat utilization

Answer

show system port-allocation

Answer

show flow nat sessions

Question 5

You are troubleshooting an IPsec VPN tunnel between two SRX Series gateways. Phase 2 negotiations are failing. Which operational command should you use to check Phase 2 IPsec security association statuses and traffic counters?

Accepted Answer

show security ipsec security-associations. The command 'show security ipsec security-associations' displays active Phase 2 IPsec SAs.

Answer

show security ike security-associations

Answer

show vpn tunnels active

Answer

show crypto ipsec sa

Question 6

You are configuring a branch SRX Series device and need to verify the current zone assignments for all interfaces. Which operational command displays interfaces along with their associated security zones?

Accepted Answer

show security zones. The command 'show security zones' displays security zones and their assigned interfaces.

Answer

show zones interface-mapping

Answer

show interfaces security-zone

Answer

show firewall zones

Question 7

What is the default action of Junos OS when an administrator exits configuration mode without committing changes?

Accepted Answer

The candidate configuration changes are discarded.. Exiting configuration mode without committing discards any uncommitted changes made in the candidate configuration.

Answer

The changes are saved to a temporary backup file only.

Answer

The changes are automatically saved and committed.

Answer

The device reboots to clear the memory.

Question 8

When configuring physical and logical interfaces on an SRX Series device, which TWO parameters are required to properly define a logical unit for IP routing? (Choose two)

Accepted Answer

Family inet IP address assignment. Configuring a logical unit requires an interface unit number and an inet family IP address configuration.

Answer

BGP autonomous system number

Answer

Chassis cluster redundancy group ID

Answer

MAC address override

Question 9

Which TWO actions occur during the initial packet flow processing on an SRX Series device when a new session is established? (Choose two)

Accepted Answer

Route lookup (destination routing table check). When a new session is established, the SRX performs a route lookup and evaluates security policies to determine whether to permit or deny the flow.

Answer

Immediate CPU kernel panic generation

Answer

Automatic conversion of IPv4 to IPv6

Answer

Immediate flooding of the packet to all zone interfaces

Question 10

An administrator is troubleshooting a high-availability (HA) cluster on SRX Series devices. Which THREE states or conditions are valid operational statuses for redundancy groups in a chassis cluster? (Choose three)

Accepted Answer

Primary. Chassis cluster redundancy groups maintain operational states such as Primary, Secondary, and Ineligible.

Answer

Disabled

Answer

Suspended

Question 11

An administrator is troubleshooting high CPU utilization on the Routing Engine of an enterprise SRX Series device. They suspect a runaway routing protocol or management process. Which command displays the top processes consuming CPU resources on the Routing Engine?

Accepted Answer

show system processes summary (or 'show system processes extensive'). The command 'show system processes extensive' or similar shell commands display CPU consumption by individual system processes.

Answer

show security spc processes

Answer

show kernel cpu-usage

Answer

show chassis cpu-processes

Question 12

Which TWO components are fundamental parts of the SRX Series architecture in enterprise-class hardware models? (Choose two)

Accepted Answer

Routing Engine (RE). Enterprise SRX models feature dedicated Routing Engines and Security Processing Cards.

Answer

Integrated ADSL modem chip

Answer

Floppy disk drive controller

Answer

Token Ring interface controller

Question 13

Which TWO methods can be used to access the Junos CLI on an SRX Series device during initial setup or routine administration? (Choose two)

Accepted Answer

Local console serial connection. Administrators can access the Junos CLI via the local console port or remotely using SSH over management/data interfaces.

Answer

Bluetooth pairing app

Answer

Unencrypted Telnet by default

Answer

VGA monitor and USB keyboard directly plugged into SPC

Question 14

An administrator is configuring Source NAT on an SRX Series device. Which THREE match criteria can be used within a Source NAT rule set or rule to identify traffic for translation? (Choose three)

Accepted Answer

Application or protocol / port. Source NAT rule matching can utilize source address, destination address, and application or service criteria.

Answer

CPU utilization threshold

Answer

Chassis cluster node serial number

Question 15

Which TWO tasks are performed using Junos operational mode commands? (Choose two)

Accepted Answer

Viewing interface status and traffic counters. Operational mode commands are used to view device status, interface statistics, and execute troubleshooting diagnostics.

Answer

Creating new security policies and editing candidate configurations

Answer

Defining security zones

Answer

Configuring static routes