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| Section | Objectives |
|---|---|
| Topic 1: User Interfaces and Configuration Basics | - CLI and Basic Configuration
|
| Topic 2: Operational Monitoring and Maintenance | - Monitoring and Troubleshooting
|
| Topic 3: Networking Fundamentals | - Core Networking Concepts
|
| Topic 4: Junos OS Fundamentals | - Junos Architecture and Operations
|
| Topic 5: Routing Policy and Firewall Filters | - Policy Control and Packet Filtering
|
| Topic 6: Routing Fundamentals | - Routing Concepts and Configuration
|
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NEW QUESTION # 86
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;
Answer: B,C
Explanation:
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.
NEW QUESTION # 87
Which two traffic types are processed by a Routing Engine using Junos OS? (Choose two.)
Answer: B,C
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. Reference: Junos OS Fundamentals, Control Plane Functions, Routing Engine Traffic.
NEW QUESTION # 88
Which Junos feature limits the amount of exception traffic that is sent from the PFE to the RE?
Answer: A
NEW QUESTION # 89
What are two types of transit traffic that traverse the forwarding plane of a Layer 3 router?
(Choose two.)
Answer: C,D
Explanation:
Transit traffic that traverses the forwarding plane of a Layer 3 router includes both unicast and multicast traffic types. Unicast traffic is directed from a single source to a single destination, while multicast traffic is sent from one source to multiple destinations that are part of a multicast group.
These types of traffic are efficiently routed through the network by leveraging the router's forwarding plane capabilities. Exception traffic, which requires special handling by the control plane, and broadcast traffic, which is typically limited to a single broadcast domain and not usually forwarded by Layer 3 routers, are not considered standard types of transit traffic for the forwarding plane of a router.
NEW QUESTION # 90
Referring to the exhibit, with firewall filter Packet-Filter attached to an interface, if traffic is sent from 192.168.1.1 to 8.8.8.8 for a UDP DNS query, what will happen to the traffic?
Answer: A
Explanation:
Junos OS firewall filters operate on a first-match basis, evaluating terms sequentially from top to bottom. In this scenario, a UDP DNS packet (destination port 53) is sent from 192.168.1.1 to
8.8.8.8. Evaluation begins with term 1, which matches the correct source and destination IP addresses but specifies protocol tcp. Because the actual traffic uses UDP, term 1 is not a match.
Evaluation then moves to term 2. While term 2 correctly identifies protocol udp and port domain (port 53), it requires the source-address to reside within the 192.168.2.0/24 subnet. Since the source is 192.168.1.1, term 2 also fails to match.
When a packet fails to match any explicitly defined terms in a Junos firewall filter, it is subject to the implicit deny action. This default "last term" is a hardcoded safety mechanism that automatically discards all traffic that has not been explicitly permitted. Consequently, because neither term provides a match for the specific combination of source IP, protocol, and destination port, the DNS query is silently dropped by the Packet Forwarding Engine. This behavior ensures that Junos devices maintain a "deny-by-default" security posture, requiring administrators to define precise permit statements for all required transit or management traffic.
NEW QUESTION # 91
......
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