JN0-106測試 & JN0-106考試大綱

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Juniper JN0-106 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Networking Fundamentals	15%	- Networking concepts and models 1. TCP/IP suite and protocol functions 2. Collision and broadcast domains - IP addressing and subnetting 1. Subnetting, supernetting and route summarization 2. IPv4 and IPv6 addressing - Ethernet and switching fundamentals 1. MAC addressing and frame processing 2. Switching operations and VLAN concepts
Topic 2: Configuration Basics	15%	- Basic system configuration 1. Hostname, domain name and name servers 2. User authentication and permissions - Configuration management 1. Candidate, active and factory-default configurations 2. Hierarchy structure and configuration modes - Commit and rollback operations 1. Rollback and rescue configuration 2. Commit, commit-check, commit-confirmed
Topic 3: Routing Policy and Firewall Filters	10%	- Routing policy 1. Policy application and flow control 2. Policy structure, terms, match conditions and actions - Firewall filters 1. Filter structure, match conditions and actions 2. Filter processing and reverse path forwarding
Topic 4: Junos OS Fundamentals	20%	- Junos architecture 1. Routing Engine and Packet Forwarding Engine 2. Control and forwarding planes - Software versions and upgrades 1. Upgrade and downgrade procedures 2. Junos OS release types - Traffic processing 1. Transit and exception traffic flow 2. Packet handling and forwarding logic
Topic 5: Routing Fundamentals	10%	- Static and dynamic routing 1. OSPF, RIP and BGP basics 2. Static routes and qualified next hops - Routing concepts 1. Routing tables and route sources 2. Longest match routing and administrative distance
Topic 6: User Interfaces	15%	- Command Line Interface (CLI) 1. Operational and configuration modes 2. Command syntax, help and filtering - Other management interfaces 1. J-Web GUI overview 2. NETCONF, SSH and out-of-band management
Topic 7: Operational Monitoring and Maintenance	15%	- System maintenance 1. Password recovery and system recovery 2. File management and storage monitoring - Monitoring commands 1. Show commands for system, interfaces and routing 2. Logging, tracing and troubleshooting tools

>> JN0-106測試 <<

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最新的 JNCIA JN0-106 免費考試真題 (Q56-Q61):

問題 #56
Which statement describes the primary purpose of a routing policy in Junos OS?

A. It sets the maximum number of routes in the routing table.
B. It controls which routes are accepted or advertised by a routing protocol.
C. It determines the physical interface used for forwarding traffic.
D. It enables automatic rollback of routing changes.

答案：B

解題說明：
In Junos OS, a routing policy is a powerful tool used to manage the flow of routing information between the Routing Information Base (RIB) and routing protocols. Unlike forwarding decisions, which are handled by the Packet Forwarding Engine, routing policies function within the control plane on the Routing Engine. Their primary purpose is to define specific criteria for importing routes into the routing table from neighbors or exporting routes from the routing table to neighbors.
Routing policies consist of terms containing from (match) and then (action) statements. They allow administrators to filter prefixes (e.g., denying specific BGP routes), modify route attributes (e.g., changing OSPF metrics or BGP communities), and manipulate path selection behavior. For example, an export policy might be used to ensure that only specific internal subnets are advertised to an ISP via BGP, preventing the accidental leakage of private infrastructure addresses. By default, Junos applies "default policies" for each protocol (such as OSPF accepting all OSPF routes), but custom policies allow for granular control over how the device interacts with the rest of the network. This ensures that the routing table contains only the desired paths for optimal traffic engineering.

問題 #57
Which statement about collision domains and broadcast domains is correct?

A. A router separates collision domains but forwards all broadcast traffic between its interfaces.
B. VLANs on a switch reduce collision domains but have no effect on broadcast domains.
C. A switch creates a separate collision domain for each port, but all ports remain in the same broadcast domain by default.
D. Broadcast domains are only relevant in IPv4 networks and are not used in IPv6 networks.

答案：C

解題說明：
Understanding the distinction between collision and broadcast domains is fundamental to Layer 2 and Layer 3 networking. In a modern Ethernet switching environment, a switch effectively eliminates collisions by creating a separate collision domain for each of its physical ports. This is achieved through micro- segmentation and the support of full-duplex communication, which allows for simultaneous transmission and reception of data on a per-port basis.
However, while a switch segments collision domains, it does not inherently segment broadcast domains. By default, all ports on a switch reside within the same broadcast domain, meaning that a broadcast frame (such as an ARP request) received on one port will be flooded to all other ports within that specific VLAN or bridge domain. Segmenting broadcast domains requires either the configuration of Virtual LANs (VLANs) or the use of a Layer 3 device like a router, which does not forward broadcast traffic by default between its interfaces. It is a common misconception that broadcast domains are absent in IPv6; while IPv6 utilizes multicast (via NDP) instead of traditional Layer 2 broadcasts, the concept of the " link-local " scope where these packets are distributed remains functionally equivalent to a broadcast domain. For the JNCIA-Junos standard, the core takeaway is that switches provide per-port collision isolation while maintaining a unified broadcast environment unless explicitly partitioned. Reference: Networking Fundamentals, Collision and Broadcast Domains.

問題 #58
Click the Exhibit button.

Which two statements are true about the firewall filter configuration shown in the exhibit? (Choose two.)

A. It applies the filter to a physical interface.
B. It sends filtered data to a syslog file.
C. It evaluates SSH packets egressing from the management interface.
D. It counts the number of SSH packets that egress from the source SSH interface.

答案：C,D

解題說明：
The filter is applied in the output direction on interface me0.0, so it examines traffic leaving the management interface. The first term matches packets whose destination port is SSH and uses the count action, which increments counter c1 for those matching egress SSH packets.

問題 #59
Which two statements describe the result when you enter ? at the command-line prompt?
(Choose two.)

A. It lists tips for the help menu.
B. It displays summary information about the commands and options.
C. It lists the available commands and options.
D. It displays help about a text string contained in a statement.

答案：B,C

解題說明：
When you enter ? at the command-line prompt in Junos OS, the system provides assistance in two significant ways. Firstly, it lists the available commands and options that can be used at the current point in the command hierarchy, aiding users in understanding what commands they can execute next. Secondly, it displays summary information about those commands and options, providing brief descriptions or additional context that can help users understand the function of each command or option. This feature is particularly useful for learning the command structure or for quick reference when specific command syntax is forgotten.

問題 #60
Which two statements about prefix lists in Junos are correct? (Choose two.)

A. Prefix lists cannot be used in routing policies.
B. Prefix lists cannot be used in firewall filters.
C. Prefix lists can be re-used in multiple routing policies.
D. Prefix lists can be used in both firewall filters and routing policies.

答案：C,D

解題說明：
Prefix lists are reusable objects that can be referenced in multiple routing policies. They can also be used in both routing policies and firewall filters to match IP prefixes.

問題 #61
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