很多人都認為要通過一些高難度的JN0-106認證考試是需要精通很多Juniper專業知識。只有掌握很全面的IJuniper知識的人才會有資格去報名參加的考試。其實現在有很多方法可以幫你彌補你的知識不足的，一樣能通過JN0-106認證考試，也許比那些專業知識相當全面的人花的時間和精力更少，正所謂條條大路通羅馬。
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問題 #97
What are two functions of the Routing Engine? (Choose two.)
答案：B,D
解題說明：
The Routing Engine (RE) is the " brains " of a Juniper device, representing the control plane in the Junos dual-plane architecture. One of its primary functions is that it runs the Junos OS . The RE is essentially a high-performance workstation running a specialized version of FreeBSD that hosts the various software daemons responsible for the device ' s logic, such as the Routing Protocol Process (rpd) and the Device Control Process (dcd).
The second core function is that the RE processes all management traffic . Any packet destined for the router itself-such as an SSH session, an SNMP poll, a NETCONF request, or an NTP update-is handled by the Routing Engine ' s CPU. The RE also maintains the master routing table, manages configuration commits, and provides the CLI environment for the administrator.
It is critical to distinguish these control-plane duties from the duties of the Packet Forwarding Engine (PFE)
. The PFE is responsible for the " heavy lifting, " such as processing transit traffic (data passing through the router) and evaluating firewall filters at wire speed. While the RE defines the policies and routing tables, it hands off a streamlined version of this information to the PFE so the RE isn ' t bogged down by millions of individual packets. This separation ensures that a busy management session or a complex routing calculation on the RE doesn ' t impact the device ' s ability to forward traffic at maximum capacity.
Reference: Junos OS Fundamentals, Control Plane and Forwarding Plane.
問題 #98
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
答案：B
解題說明：
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.
Reference: Routing Policy and Firewall Filters, Firewall Filter Actions, next-term evaluation.
問題 #99
You are configuring a new router and want to ensure that you can recover from future misconfigurations. In this scenario, what should you do after completing the initial configuration?
答案：B
解題說明：
Creating a rescue configuration saves a known good configuration that can be quickly restored in case of future misconfigurations, providing a reliable recovery point.
問題 #100
Which layer of the OSI model contains the IP address information?
答案：A
解題說明：
The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions in seven distinct layers. IP (Internet Protocol) addresses are part of Layer 3, known as the Network Layer. This layer is responsible for packet forwarding, including routing through intermediate routers, and it handles the logical addressing scheme of the network to ensure that packets can be routed across multiple networks and reach their destination. IP addresses provide unique identifiers for network interfaces, allowing for communication between devices on a network or across different networks.
問題 #101
After the factory default configuration is loaded, which configuration object must be created prior to the first commit?
答案：A
解題說明：
When a Junos device is initialized with its factory default configuration, it essentially exists in a
"blank slate" state with minimal operational parameters. The most critical security requirement imposed by Junos OS during this initial setup phase is the mandatory configuration of a root-level password. Specifically, the root-authentication object must be defined within the [edit system] hierarchy before the system will allow the candidate configuration to be successfully committed for the first time.
This is a built-in safety mechanism designed to prevent the device from being deployed in an insecure state with an empty administrative password. If an administrator attempts to execute a commit command without having set the root password, the Junos OS parser will return an error and fail the commit process. While setting a host name or configuring management interfaces are best practices for operational readiness, they are not strictly required by the Junos commit-check logic. Only the root-authentication (typically a plain-text password or an encrypted string) is a hard prerequisite to transition the device from the factory-default state to an active, running configuration.
問題 #102
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