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NEW QUESTION # 50
Your routing policy has three terms. A route matches the first term with an accept action. In this scenario, what happens next?
Answer: C
Explanation:
Junos OS routing policies are evaluated using a sequential, " first-match " logic. When a route is compared against a policy, the system evaluates the terms in the order they are defined. Once a route meets all the match criteria (the from statement) in a term, the router executes the associated action (the then statement).
If the action is a terminating action -such as accept or reject-the evaluation of that specific route for that specific policy ends immediately. In this scenario, since the route matched the first term and the action was accept, the route is successfully processed and the policy evaluation is complete. The system will not proceed to evaluate the second or third terms. This behavior is critical for network architects to understand when ordering terms; more specific " exceptions " must be placed at the top of the policy, while broader " catch-all " terms must be placed at the bottom. If the administrator wanted the evaluation to continue to the next term despite a match, they would need to explicitly include the next term action, which is a non-terminating action.
Without it, a match on an accept action signifies the final decision for that route within that policy context.
NEW QUESTION # 51
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 # 52
What are two fiber-optic connector types? (Choose two.)
Answer: B,D
Explanation:
LC and SC are standard fiber-optic connector types used for optical networking connections.
NEW QUESTION # 53
Which two types of traffic are processed by the Routing Engine? (Choose two.)
Answer: A,D
Explanation:
The Routing Engine (RE) is the control-plane component of a Junos OS device. Its primary responsibilities include routing protocol processing, system management, maintaining routing tables, running Junos OS processes, and providing administrative access. Consequently, management traffic and control traffic are processed by the Routing Engine. Juniper specifically describes the Routing Engine as controlling routing updates and system management , while routing protocol packets from the network are directed to the Routing Engine.
Management traffic includes traffic associated with services such as SSH, Telnet, SNMP, and other traffic whose destination is the device itself. Control traffic includes routing protocol communications such as OSPF, BGP, and other protocol packets required to establish and maintain the device ' s control-plane state. Juniper categorizes these as local packets , which are handled by the Routing Engine.
By contrast, transit traffic enters one physical interface and is forwarded toward another destination. This forwarding operation is normally handled by the Packet Forwarding Engine (PFE) rather than the Routing Engine. The separation of forwarding and control functions is fundamental to Junos OS architecture.
Study Guide Reference Topics: Junos OS Fundamentals - Routing Engine and Packet Forwarding Engine; control plane versus forwarding plane; management and protocol traffic.
NEW QUESTION # 54
Which two operational mode commands would you use to verify CPU and memory utilization on a Junos device? (Choose two.)
Answer: C,D
Explanation:
In the Junos OS architecture, maintaining visibility into the health of the Routing Engine (RE) is paramount for ensuring control plane stability. The command show chassis routing-engine is the primary tool for a high- level hardware status overview. It provides critical telemetry regarding the RE ' s current CPU utilization (broken down by user, background, and kernel tasks), memory usage statistics, and uptime. This command is essential for identifying if the device ' s " brain " is under significant stress due to heavy protocol processing or management tasks.
For a more granular, process-specific analysis, the show system processes extensive command is utilized.
Similar to the ' top ' utility in Unix-based systems, it lists all active software daemons (such as rpd for routing, dcd for interfaces, and mgd for management) and ranks them by their real-time CPU and memory consumption. This allows an architect to pinpoint exactly which process might be causing a performance bottleneck. While show chassis environment focuses on physical hardware health like temperatures and fan speeds, and resource-monitor provides summary data, the combination of show chassis routing-engine and show system processes extensive offers the most comprehensive diagnostic view of the device ' s internal computational resources. Reference: Operational Monitoring and Maintenance, System Health Monitoring.
NEW QUESTION # 55
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