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| Section | Objectives |
|---|---|
| Routing Fundamentals in Junos | - OSPF basics - Dynamic routing overview - Static routing |
| Networking Fundamentals | - OSI and TCP/IP models - IPv4/IPv6 addressing basics - Routing fundamentals - Subnetting concepts |
| Junos OS Fundamentals | - Junos OS architecture - Junos CLI navigation and commands - Configuration hierarchy and commit model - Operational vs configuration mode |
| Security and Network Services Basics | - NAT concepts overview - Firewall filters basics |
| Configuration and Monitoring | - Monitoring and troubleshooting tools - System services and users - Interface configuration |
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NEW QUESTION # 38
After the factory default configuration is loaded, which configuration object must be created prior to the first commit?
Answer: A
Explanation:
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.
NEW QUESTION # 39
Exhibit:
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
Answer: B
Explanation:
The network topology illustrates two distinct IP subnets, 10.1.1.0/24 and 10.1.2.0/24 , separated by a Layer 3 router. For hosts on the first subnet to communicate with the server on the second subnet, an intermediary device must perform inter-subnet routing. The router acts as the exit point for each local segment, utilizing its interfaces assigned with the .254 host address as the logical path to external networks.
The fundamental requirement for this communication is the configuration of a default gateway on all end- nodes. When the users (on 10.1.1.0/24 ) attempt to send data to the server (on 10.1.2.0/24 ), their local TCP/IP stack recognizes the destination is not on the local wire. Without a defined default gateway, the hosts would simply drop the traffic as unroutable. By setting the default gateway to 10.1.1.254 for users and 10.1.2.254 for the server, the hosts are instructed to forward all off-net traffic to the router. The router then consults its routing table-which contains these directly connected routes-and forwards the packets to the appropriate egress interface. While VLAN tagging or routing protocols could exist in more complex environments, the primary necessity for basic reachability between these two specific segments is a correctly configured gateway on the terminal devices. Reference: Networking Fundamentals, IP Routing Basics, Default Gateway Configuration.
NEW QUESTION # 40
When considering routing policies, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
Routing policies in Junos OS are crucial for controlling route advertisements and path selection.
The correct answers are B and C. An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base (RIB), and policy terms are evaluated from top to bottom, with action taken on the first match found. This sequential evaluation allows for precise control over routing decisions.
NEW QUESTION # 41
What are two ways that the carrier-sense multiple access with collision detection (CSMA/CD) MAC protocol help devices "talk" with each other in an Ethernet network? (Choose two.)
Answer: A,C
Explanation:
CSMA/CD allows an Ethernet device to check if the network is idle (carrier sense) before attempting to transmit, reducing the chance of collisions.
With CSMA/CD, a device can either transmit or receive data at a given time (half-duplex), not both simultaneously, which helps coordinate communication and manage collisions.
NEW QUESTION # 42
Which two tasks would you perform in operational mode? (Choose two.)
Answer: B,C
Explanation:
The Junos Command Line Interface (CLI) is structured into two primary hierarchical modes:
operational mode and configuration mode. Operational mode is the default entry point when a user logs into the device, signified by the > prompt. This mode is designed for monitoring the health of the device, troubleshooting network issues, and executing system-level maintenance tasks. Specifically, an administrator uses operational mode to verify the version of Junos OS currently active on the device using the show version command.
Additionally, system-level administrative actions that do not involve modifying the device's persistent configuration logic are performed within the operational mode. This includes requesting the system to reboot or halt via the request system hierarchy of commands. In contrast, tasks that involve manipulating the configuration database--such as committing proposed changes or rolling back to a previous configuration version--require the user to transition into configuration mode, indicated by the # prompt. Understanding this distinction is vital for efficient navigation of the Junos CLI; while operational mode provides the tools to observe the system and manage its physical state, configuration mode is reserved for altering the logical parameters and routing policies that govern device behavior.
NEW QUESTION # 43
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