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>> JN0-106 Examinations Actual Questions <<
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NEW QUESTION # 15
Your switch01 device lost network connectivity after a configuration change. You must recover the device to a known working state using the rescue configuration that was previously saved.
The device is only accessible using the console. In this scenario, which command sequence will successfully restore the rescue configuration?
Answer: A
Explanation:
In Junos OS, the rescue configuration is a specifically designated file that stores a known-working configuration, intended to be used for emergency recovery when the device becomes unreachable or unstable due to recent changes. This configuration is not created automatically; an administrator must proactively save a stable state using the operational mode command request system configuration rescue save. This differs from the standard rollback archive, which automatically stores up to 50 previous configurations but can eventually rotate out the specific
"last known good" state needed for recovery.
When a device loses network connectivity, console access becomes the only viable management path. To restore the rescue configuration, the administrator must enter configuration mode using the configure command. Once inside the candidate configuration buffer, the rollback rescue command is issued. This command directs the Junos OS to locate the designated rescue file and load its contents over the current candidate configuration. Upon receiving the "load complete" confirmation, the administrator must execute a commit to promote the candidate configuration to the active, running state. Sequence C correctly follows this logic. Sequence A is technically incorrect for standard rescue restoration as load override typically targets specific file paths or URLs, whereas rollback rescue is the built-in mechanism for this function. Sequences B and D are destructive or counter-productive, either deleting the rescue file or overwriting it with the current, non-functional configuration state.
NEW QUESTION # 16
What are two requirements for root password recovery in Junos? (Choose two.)
Answer: A,D
Explanation:
Root password recovery in Junos OS is a critical administrative procedure designed to regain access to the management plane when the root credentials are lost. This process is fundamentally tied to the physical security of the device, as it requires two specific conditions that cannot be met over a standard network connection. First, the administrator must have direct console access to the device. Because the recovery process involves interrupting the Junos boot sequence before the operating system kernel and its associated security services (such as SSH) are fully initialized, it must be performed through the serial management port.
Second, a system reboot is mandatory. The recovery mechanism is triggered by interrupting the boot loader (typically the " Loader " or " U-Boot " stage) by pressing the Space bar or a specific key sequence during power-on. This allows the administrator to enter " single-user mode " or boot into a " recovery " state. Once in this restricted environment, the device mounts its internal storage in a way that permits the modification of the root authentication parameters without requiring the existing password. This workflow intentionally bypasses the standard authentication database to restore management control while preserving the rest of the device configuration. This procedure underscores the importance of securing physical access to the chassis, as anyone with console access and the ability to cycle power can eventually gain root-level authority over the system.
Reference: Operational Monitoring and Maintenance, System Recovery and Password Management.
NEW QUESTION # 17
Which two statements are correct about SNMPv3? (Choose two.)
Answer: B,C
Explanation:
Simple Network Management Protocol version 3 (SNMPv3) represents a significant security evolution over its predecessors, SNMPv1 and SNMPv2c. While earlier versions relied on " community strings " sent in plain- text-which are easily intercepted and provide minimal security-SNMPv3 introduces a comprehensive security framework known as the User-based Security Model (USM). The primary benefit of SNMPv3 is that it protects against tampering and eavesdropping. It achieves this through two main mechanisms: message integrity (authentication), which ensures that a packet has not been altered in transit, and data confidentiality (privacy), which encrypts the payload of the SNMP packets using advanced algorithms like AES or DES.
Furthermore, SNMPv3 provides for secure communication by utilizing encrypted credentials rather than cleartext strings. Administrators define specific users and assign them security levels: noAuthNoPriv, authNoPriv, or authPriv. In the most secure mode (authPriv), the system requires both a password for authentication (validated via MD5 or SHA hashes) and a separate password for encryption. This architecture ensures that management traffic-including sensitive device telemetry and configuration data-remains confidential and authenticated as it traverses the network. While SNMPv3 is inherently more complex to configure than SNMPv2c due to these additional security parameters, it is the required standard for any production Junos environment where management plane integrity is a priority.
Reference: Operational Monitoring and Maintenance, SNMP Management and Security.
NEW QUESTION # 18
Which protocol connects multiple autonomous systems?
Answer: D
Explanation:
BGP (Border Gateway Protocol) is the standard exterior gateway protocol used to exchange routing information between different autonomous systems (ASes), enabling communication across the internet backbone.
- iBGP (Internal BGP) is used for routing within a single AS.
- eBGP (External BGP) is used to connect and exchange routing information between multiple autonomous systems.
NEW QUESTION # 19
Which statement is correct about the default security policy behavior on an SRX device?
Answer: A
Explanation:
By default, SRX devices deny all inter-zone traffic unless a security policy explicitly permits it, following a default-deny security posture.
NEW QUESTION # 20
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