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NEW QUESTION # 14
What are two requirements for root password recovery in Junos? (Choose two.)
Answer: A,C
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 # 15
What are two benefits when implementing class of service? (Choose two.)
Answer: A,D
Explanation:
Class of Service (CoS) is a method used to prioritize traffic based on its type or importance. It allows you to define different levels of service for different types of traffic.
B). Traffic congestion can be managed: CoS helps to prioritize traffic and allocate bandwidth more effectively, allowing critical or time-sensitive traffic to be given priority over less important traffic, which helps to manage congestion.
D). Latency-sensitive traffic can be prioritized: CoS enables you to give higher priority to latency- sensitive traffic (e.g., VoIP or video) over less time-sensitive traffic (e.g., file transfers), ensuring that these critical services perform well even during network congestion.
NEW QUESTION # 16
What are two fiber-optic connector types? (Choose two.)
Answer: A,B
Explanation:
Physical layer connectivity for Junos devices involves a variety of media types, with fiber-optic cabling being the standard for high-speed, long-distance, or high-density uplink requirements. Two of the most prevalent connector types used in these environments are the LC (Lucent Connector) and the SC (Subscriber Connector) .
The LC connector is a small-form-factor (SFF) connector that uses a 1.25 mm ferrule. Due to its compact size and " push-and-latch " mechanism, it is the primary connector type found on SFP, SFP+, and XFP transceivers used in Juniper EX, MX, and QFX series hardware. Its high-density design allows for more ports in a limited space on a line card or chassis. The SC connector , often referred to as a " square connector, " utilizes a larger 2.5 mm ferrule and a " push-pull " snapping mechanism. While it was highly common in older legacy hardware and fiber patch panels, it has largely been superseded by the LC in modern data center and enterprise switching environments.
In contrast, the RJ-45 is a standard copper Ethernet connector (typically used with Category 5e/6 cables), and the BNC (Bayonet Neill-Concelman) is a miniature quick connect/disconnect RF connector used for coaxial cable. As a Senior Architect, distinguishing between these physical interfaces is critical when specifying the correct Small Form-factor Pluggable (SFP) modules and patch cables required to bring a Junos interface into an operational up/up state.
Reference: Networking Fundamentals, Physical Layer and Media Types.
NEW QUESTION # 17
When considering routing tables and forwarding tables, which two statements are correct?
(Choose two.)
Answer: A,C
Explanation:
The routing table and forwarding table play distinct roles in a Junos OS device. The correct answers are A and D.
The routing table (A) is used by the Routing Engine (RE) to select the best route among all the learned routes, while the routing table (D) stores all routes and prefixes learned from all routing protocols. The forwarding table, in contrast, contains only the active routes chosen by the RE and is used by the Packet Forwarding Engine for actual packet forwarding.
NEW QUESTION # 18
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
Answer: B
Explanation:
Junos OS firewall filters operate on a sequential, "first-match" logic, but their behavior is significantly influenced by the use of terminating versus non-terminating actions. In this exhibit, a packet with a source address of 10.0.0.0/8 is evaluated against the filter named test.
Evaluation begins with term 1. The packet matches the source-address criteria, triggering the actions defined in the then statement. The first action is log, which sends the packet header information to the firewall task buffer for logging. The second action is next term. This is a critical non-terminating action; it instructs the Packet Forwarding Engine (PFE) to continue the evaluation process using the subsequent term in the filter rather than stopping after the match.
Evaluation then moves to term 2. Because term 2 contains no from match conditions, it acts as a
"catch-all" for any traffic that reaches it. The action in this term is reject. This is a terminating action that discards the packet and sends an ICMP "destination unreachable" message back to the source. Therefore, the packet is first recorded by the logging process and is subsequently dropped by the rejection mechanism. If next term had not been present in term 1, the packet would have been implicitly accepted (as any matched term without a terminating action like discard, reject, or accept defaults to an implicit accept in that specific term). However, the explicit instruction to move forward ensures the packet hits the reject statement.
NEW QUESTION # 19
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