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| Section | Objectives |
|---|---|
| Networking Fundamentals | - Core Networking Concepts
|
| Routing Policy and Firewall Filters | - Policy Control and Packet Filtering
|
| Junos OS Fundamentals | - Junos Architecture and Operations
|
| Operational Monitoring and Maintenance | - Monitoring and Troubleshooting
|
| Routing Fundamentals | - Routing Concepts and Configuration
|
| User Interfaces and Configuration Basics | - CLI and Basic Configuration
|
>> Sample JN0-106 Questions Answers <<
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NEW QUESTION # 56
What is the purpose of an ARP packet?
Answer: B
Explanation:
The Address Resolution Protocol (ARP) is a fundamental Layer 2 utility used within the IPv4 suite to resolve a known network-layer (Layer 3) address to its corresponding physical media access control (MAC) or hardware address (Layer 2). In a typical Ethernet environment, when a Junos device needs to forward a packet to a next-hop on a local subnet, the Packet Forwarding Engine (PFE) requires the destination MAC address to properly encapsulate the frame.
The process begins with an ARP Request, which is broadcast to all hosts on the segment asking, " Who owns this IP address? " The host assigned that specific IP responds with an ARP Reply containing its MAC address.
The Junos device then stores this mapping in its ARP cache (viewable via the show arp command) to avoid repeated broadcasts for subsequent packets. This resolution is essential because while IP addresses facilitate end-to-end logical routing, the actual delivery of data across a physical wire or switch fabric relies entirely on hardware addresses. Without successful ARP resolution, the device cannot complete the Layer 2 header, and the traffic will be dropped as " encapsulation failed. " Reference: Networking Fundamentals, Ethernet and Address Resolution Protocol.
NEW QUESTION # 57
In Junos OS, what is the function of the candidate configuration database compared to the active configuration database in system operations?
Answer: B
Explanation:
The candidate configuration is a working area where administrators make changes before committing them. The active configuration is the one currently running. This separation allows safe editing, validation, and rollback, reducing the risk of misconfiguration affecting live traffic.
NEW QUESTION # 58
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
Answer: C
Explanation:
In a typical network configuration, users and servers require a default gateway to communicate with devices on different networks or subnets. The default gateway is usually the router's interface on the same network, which routes the traffic to other networks. This is essential for the two users to access the remote server if the server is on a different subnet, which is indicated by the different network addresses.
NEW QUESTION # 59
You are using the factory default configuration on a new Juniper router. You must successfully commit the configuration and activate the device. Which component must be configured before Junos OS will allow you to accomplish this task?
Answer: D
Explanation:
When a Junos device is initialized for the first time or after a factory reset, it operates with a " factory-default
" configuration. This configuration contains the minimum settings necessary for the device to boot, but it lacks essential security parameters. The Junos OS kernel enforces a strict security mechanism that prevents any administrator from successfully executing a commit command until a root-level password has been defined.
Specifically, the root-authentication object must be configured under the [edit system] hierarchy. This requirement ensures that no Junos device is deployed into a production environment with an open, unauthenticated root account. If an administrator attempts to commit changes without this setting, the configuration parser will return a " missing mandatory statement " error and the commit process will fail.
While other settings-such as a system hostname, management IP address (on the fxp0 or me0 interfaces), or logical interface configurations-are critical for operational readiness, they are not strictly enforced by the system validation logic for the initial activation. Only the root-authentication (which can be a plain-text password or an encrypted key) is a hard prerequisite for transitioning the device from a default state to an active, running configuration.
Reference: Configuration Basics, Initial Configuration, System Security.
NEW QUESTION # 60
Which layer of the OSI model contains the IP address information?
Answer: A
Explanation:
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.
NEW QUESTION # 61
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