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| Section | Objectives |
|---|---|
| Topic 1: Networking Fundamentals | - Core Networking Concepts
|
| Topic 2: Routing Policy and Firewall Filters | - Policy Control and Packet Filtering
|
| Topic 3: Junos OS Fundamentals | - Junos Architecture and Operations
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| Topic 4: Operational Monitoring and Maintenance | - Monitoring and Troubleshooting
|
| Topic 5: Routing Fundamentals | - Routing Concepts and Configuration
|
| Topic 6: User Interfaces and Configuration Basics | - CLI and Basic Configuration
|
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NEW QUESTION # 81
Which OSPF neighbor state indicates that two routers have fully synchronized their link-state databases?
Answer: D
Explanation:
The Full state indicates that OSPF routers have completed database synchronization and are fully adjacent.
NEW QUESTION # 82
Which two traffic types are processed by a Routing Engine using Junos OS? (Choose two.)
Answer: A,B
Explanation:
The Routing Engine (RE) in a Junos device serves as the centralized intelligence and management hub, primarily responsible for the control and management planes of the system. In this capacity, the RE is tasked with processing routing updates, such as OSPF Link State Advertisements (LSAs) or BGP Update messages. These updates are vital for the RE to maintain the Routing Information Base (RIB), calculate the shortest paths, and subsequently populate the Forwarding Information Base (FIB) which is then pushed to the Packet Forwarding Engine (PFE).
Furthermore, the Routing Engine handles all local management traffic. This category encompasses administrative access through the Command Line Interface (CLI) via SSH or Telnet, SNMP queries from network management systems, and system logging processes.
Because the RE runs the Junos OS kernel, it must directly interpret and respond to these management-level requests to ensure the device remains configurable and observable.
Conversely, transit traffic--the data passing through the device from one ingress port to an egress port--is offloaded to the PFE to be handled at wire speed. While the PFE manages the heavy lifting of data forwarding and Class of Service (CoS) application, the RE remains focused on high- level protocol maintenance and system administration, ensuring that control plane stability is maintained even under heavy traffic loads.
NEW QUESTION # 83
Which statement accurately describes the Junos candidate configuration?
Answer: B
Explanation:
In the Junos OS architecture, the configuration environment is strictly bifurcated to ensure system stability and integrity. The candidate configuration is a specific database that serves as a staging area, storing all proposed changes made by an administrator during a configuration session before they are finalized. Unlike other network operating systems where changes might take effect immediately upon entry, Junos utilizes this
" sandbox " approach where modifications reside only in the candidate database until a commit command is explicitly executed.
Once the commit process is initiated, the Junos OS kernel validates the candidate configuration for syntax errors and logical consistency. If the validation check is successful, the candidate configuration is promoted and becomes the active configuration-the operational state currently running on the device hardware. This separation allows multiple administrators to work on complex changes without impacting live transit traffic or device stability prematurely. If a mistake is identified during the editing process, the candidate configuration can be easily discarded or compared against the active state to identify discrepancies. This workflow is a cornerstone of Junos OS, facilitating a " check-before-apply " methodology that is essential for carrier-grade reliability and minimizing the risk of accidental outages during critical maintenance windows. Reference:
Junos OS Fundamentals, Configuration Databases, Candidate vs. Active.
NEW QUESTION # 84
Which advantage is provided by multiple software processes running in the Junos OS?
Answer: A
NEW QUESTION # 85
Which two addresses are included in an Ethernet frame header? (Choose two.)
Answer: B,D
Explanation:
An Ethernet frame header includes the source MAC address (B) and the destination MAC address (D). These addresses are used to deliver the frame from one Ethernet device to another directly connected Ethernet device on the same network segment. Ethernet frames do not include IP addresses, as those are part of the IP packet encapsulated within the Ethernet frame.
NEW QUESTION # 86
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