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16. Frage
Which two statements about prefix lists in Junos are correct? (Choose two.)
Antwort: A,B
Begründung:
Prefix lists in Junos OS are named collections of IP addresses or network prefixes defined under the [edit policy-options] hierarchy. One of their most powerful features is their versatility and reusability. Because they are defined as independent objects, a single prefix list can be referenced in multiple different routing policies across the device. This modularity ensures consistency; for instance, if a set of " internal " prefixes changes, an administrator only needs to update the list in one location for those changes to propagate to every policy that utilizes it.
Furthermore, prefix lists are designed to be used across different functional areas of the Junos architecture.
They are equally valid for use in routing policies (to control the import or export of routes between protocols like BGP or OSPF) and in firewall filters (to match source or destination addresses for transit or management traffic). When used in a routing policy, the prefix list typically performs an exact match on the prefix length unless modified by a match type like orlonger. In a firewall filter, it acts as a high-speed lookup table for the Packet Forwarding Engine. This dual-purpose capability makes prefix lists a foundational tool for architects seeking to implement scalable, automated security and routing logic within a unified configuration framework.
17. Frage
What are two fiber-optic connector types? (Choose two.)
Antwort: A,B
Begründung:
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.
18. Frage
A security policy requires that a user account be created for auditing purposes. This user should only view configuration and operational data without making any changes. Which predefined login class would satisfy this requirement?
Antwort: D
Begründung:
Junos OS provides several predefined login classes to implement Role-Based Access Control (RBAC) efficiently. For an auditor who needs to verify the current state of the device without the risk of altering it, the read-only class is the ideal choice.
The read-only class allows a user to log in and execute show commands to view the running configuration and operational statistics. However, it strictly prohibits the user from entering configuration mode (using the configure command) or executing any " impactful " operational commands that could reset counters, clear log files, or affect traffic flow.
It is important to distinguish this from the operator class. While the operator class also cannot change the configuration, it does have permissions to clear interface statistics, reset routing protocol neighbors, and perform other " clear " or " reset " actions. For a pure auditing role where even resetting a counter would be considered a breach of policy, read-only provides the necessary " look but don ' t touch " environment. The super-user class, conversely, has full unrestricted access, and unauthorized is not a standard functional class.
Using the read-only class ensures compliance with security best practices by granting the minimum necessary privileges required for the auditing task.
Reference: User Interfaces, Predefined Login Classes, Access Control.
19. Frage
Which command would you use to gracefully power off a Junos device?
Antwort: D
Begründung:
Maintaining the integrity of the Junos OS file system is a critical operational requirement, especially during maintenance that involves removing power from the hardware. To achieve a graceful power-down, the request system halt command must be used. This command initiates a systematic shutdown of all running software processes and daemons, flushes any pending data from the system ' s volatile memory (RAM) to the solid- state storage or hard disk, and unmounts the file systems correctly. Once the software has safely shut down, the console will typically display a message indicating that it is safe to turn off the physical power switch or remove the power cables.
Using request system halt prevents potential file system corruption that can occur if power is abruptly cut while the OS is actively writing logs or configuration data. This is distinct from request system reboot, which restarts the OS, or request system logout, which merely terminates the current CLI session. As a Senior Architect, it is essential to follow this procedure to ensure that the device remains in a reliable state for its next power-on cycle. For devices equipped with dual Routing Engines, the command can often be directed to a specific member or both simultaneously to ensure a synchronized and safe shutdown of the entire chassis.
Reference: Operational Monitoring and Maintenance, System Halt and Reboot Procedures.
20. Frage
You are asked to subnet the broadcast domains but need to support 50 hosts. In this scenario, which subnet mask would satisfy this requirement?
Antwort: A
Begründung:
Determining the appropriate subnet mask for a specific host requirement is a core task in designing Junos- based network infrastructures. The number of usable hosts in an IPv4 subnet is calculated using the formula
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