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質問 # 92
You power on a new MX Series router for the first time and connect to the console. You notice that no transit interfaces are passing traffic. In this scenario, which statement is correct?
正解：D
解説：
When you initially unbox and power on a Juniper MX Series router, it loads a factory-default configuration
. Unlike some consumer-grade or lower-end enterprise switches that might have all ports active in a default VLAN, high-performance routers like the MX Series prioritize security and intentionality. In the factory- default state, the transit interfaces are not configured .
While the physical hardware interfaces (such as ge-0/0/0 or xe-0/1/0) are detected by the Junos kernel, they lack any logical unit or protocol family definitions (like family inet or family inet6). Without a logical unit- even a simple unit 0-the Packet Forwarding Engine (PFE) will not accept or forward any traffic arriving on those ports. Furthermore, as discussed in previous questions, the device is essentially in a " locked " state; you cannot even commit new changes to enable these interfaces until you have defined a root-authentication password. This " blank slate " approach ensures that no traffic accidentally flows through a newly installed provider-edge device until an architect has explicitly defined the routing policies, firewall filters, and interface parameters required for the specific network environment. To begin passing traffic, you must manually define the logical units and assign the appropriate IP addresses or switching parameters to each interface.
Reference: Configuration Basics, Initial Configuration, Factory Default Settings.
質問 # 93
Which two statements about route preference in Junos are correct? (Choose two.)
正解：B、D
解説：
Route preference is the quantitative value Junos OS uses to rank the trustworthiness of different routing sources when multiple protocols provide a path to the same destination. A critical architectural distinction in Junos is that both direct and local routes share the same default preference value of 0. Direct routes represent subnets physically connected to an interface, while local routes represent the specific IP address assigned to the device interface itself. Because a value of 0 is the lowest possible numerical value, these routes are always preferred over any learned via dynamic protocols or static configuration.
Additionally, Junos OS treats External BGP (EBGP) and Internal BGP (IBGP) differently than other vendors by assigning both an identical default preference of 170. This means that if the same prefix is learned via both EBGP and IBGP, the preference value alone will not determine the active route; the system must instead proceed to the standard BGP path selection algorithm (evaluating attributes like Local Preference, AS Path, and Origin) to break the tie. In contrast, OSPF distinguishes between its route types, assigning a preference of
10 to internal routes and 150 to AS external routes. Understanding these default values-specifically the parity between direct/local and the unified preference for BGP variants-is foundational for predicting how the Routing Engine populates the forwarding table. Reference: Routing Fundamentals, Default Route Preference Values.
質問 # 94
An administrator wants to set up a remote user authentication service for the many users that access a Juniper security device. In this scenario, what are two supported authentication protocols? (Choose two.)
正解：B、C
解説：
RADIUS and TACACS+ are supported centralized authentication protocols used for remote user authentication on Juniper devices, enabling integration with external authentication servers.
質問 # 95
What are two advantages of using the Junos OS? (Choose two.)
正解：A、B
解説：
One of the key advantages of Junos OS is its ability to roll back to previous configurations. This feature allows administrators to revert to an earlier configuration state, which is invaluable for quickly recovering from configuration errors or undesired changes. Junos OS maintains an archive of previous configurations, enabling easy rollback to any saved state. Another significant advantage of Junos OS is its modular design. The operating system is structured so that different processes and services run in separate protected memory spaces, enhancing the stability and reliability of the system. If one process fails, it does not affect the others, thereby minimizing the risk of system-wide failures.
質問 # 96
Which Junos OS CLI mode allows you to modify the device's configuration?
正解：A
解説：
Configuration mode is used to view and modify the candidate configuration. Operational mode is used to monitor and manage device operations such as viewing statistics and status.
質問 # 97
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