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| Section | Objectives |
|---|---|
| Junos OS Fundamentals | - Junos Architecture and Operations
|
| Routing Fundamentals | - Routing Concepts and Configuration
|
| Operational Monitoring and Maintenance | - Monitoring and Troubleshooting
|
| Networking Fundamentals | - Core Networking Concepts
|
| Routing Policy and Firewall Filters | - Policy Control and Packet Filtering
|
| User Interfaces and Configuration Basics | - CLI and Basic Configuration
|
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77. Frage
Referring to the exhibit, which two statements are correct? (Choose two.) policy-options { policy-statement Load-Balance-Policy { term Load- Balance { then { load-balance per-flow; accept;
}
}
}
}
routing-options {
router-id 192.168.100.11; autonomous-system 65201; forwarding-table
{ export Load-Balance-Policy;
Antwort: B,D
Begründung:
The load-balance per-flow statement in the Junos OS policy-options configuration enables flow- based load balancing in the forwarding table. This means that the traffic is distributed across multiple paths based on flows, where a flow is typically identified by attributes such as source and destination IP addresses, and possibly layer 4 information like TCP/UDP ports. This allows for more granular and efficient utilization of available paths, avoiding overloading a single path. The policy does not enable per-packet load balancing, which would send individual packets of the same flow over different paths, potentially causing out-of-order delivery issues. The policy's placement in the forwarding-table export suggests it's intended to influence forwarding behavior, not just routing protocol decisions, and does not necessarily have to be applied under the protocols hierarchy.
78. Frage
Which component is considered part of the data plane?
Antwort: A
Begründung:
The Packet Forwarding Engine (PFE) is an integral component of Juniper Networks devices, responsible for the data plane operations. The data plane, also known as the forwarding plane, is where the actual processing and forwarding of packets occur based on the routing and forwarding tables. The PFE executes the forwarding decisions made by the Routing Engine (RE), handling all packet transmissions, including routing, filtering, and switching packets towards their destination. This contrasts with the control plane operations handled by the RE, which involve routing table maintenance, system management, and control protocol processing.
79. Frage
What information does the forwarding table require so that the device forwards traffic? (Choose three.)
Antwort: A,C,E
Begründung:
The forwarding table in a network device requires specific information to efficiently forward traffic toward its destination. This includes the next hop IP address, which indicates the next router or device in the path to the destination. The outgoing interface name identifies the physical or logical interface through which the packet should be sent to reach the next hop. Lastly, the next hop MAC address is crucial for Layer 2 forwarding decisions, allowing the device to encapsulate the IP packet in a frame that can be understood by Ethernet or other Layer 2 protocols. OSPF metric values and BGP local preference values are used in the routing decision process to select the best path and populate the forwarding table but are not directly used by the forwarding table to forward traffic.
80. Frage
Which statement describes the primary purpose of a routing policy in Junos OS?
Antwort: D
Begründung:
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.
Reference: Routing Policy and Firewall Filters, Policy Framework.
81. Frage
Which Junos OS architecture component is responsible for maintaining routing protocol processes separately from the packet forwarding process?
Antwort: A
Begründung:
The Routing Engine handles control plane functions such as routing protocol processes, system management, and user access, keeping them separate from the Packet Forwarding Engine, which handles the data plane.
82. Frage
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