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NEW QUESTION # 23
You successfully committed a configuration change. You now realize an issue exists and must revert back to the previous configuration. Which command entered in configuration mode will accomplish this task when committed?
Answer: C
Explanation:
The previous committed configuration is stored as rollback 1, and loading it in configuration mode restores the last working configuration when committed.
NEW QUESTION # 24
Which two statements about route preference in Junos OS are correct? (Choose two.)
Answer: B,C
Explanation:
In Junos OS, route preference (often referred to as administrative distance in other operating systems) is the mechanism used to select the " best " path when the routing table receives multiple advertisements for the exact same destination prefix from different routing sources. The core rule for preference is that lower values indicate a more preferred or " higher priority " route . For example, a direct route has a default preference of 0, a static route is 5, and OSPF internal routes are 10. If a router learns about the same network from both OSPF and a static entry, it will select the static route because 5 is lower than 10.
Crucially, route preference is only evaluated after the longest prefix match (LPM) has been determined.
LPM is the absolute first step in packet forwarding; the router will always choose the most specific route available (e.g., a /28 over a /24). Only if there are multiple entries for that same /28 does the router look at preference to break the tie. It is a common misconception that a lower preference value can override a more specific prefix; in reality, a /32 route with a preference of 170 (BGP) will always win over a /24 route with a preference of 5 (Static). Understanding this hierarchy is vital for network architects when designing redundant paths and predictable failover behaviors.
NEW QUESTION # 25
Exhibit:
Referring to the exhibit, what is the next hop for IP address 10.0.0.9?
Answer: C
Explanation:
In Junos OS, the Packet Forwarding Engine (PFE) determines the next hop for a packet by performing a lookup in the forwarding table and identifying all valid matches for the destination IP address. When multiple routes encompass the same destination, the router strictly follows the Longest Prefix Match (LPM) rule to select the most specific entry.
For the destination address 10.0.0.9 , the following evaluation occurs based on the exhibit:
* 10.0.0.0/24 : This route matches, as the address falls within the 10.0.0.0-10.0.0.255 range.
* 10.0.0.0/26 : This route matches, as the address falls within the 10.0.0.0-10.0.0.63 range.
* 10.0.0.8/27 : This route matches, as the address falls within the 10.0.0.8-10.0.0.39 range.
* 10.0.0.4/30 : This route does not match, as its range ends at 10.0.0.7.
Among the matching entries, the prefix lengths are /24, /26, and /27. The longest prefix match is /27 , as it specifies the most granular network segment. Because 10.0.0.8/27 is the most specific match for the destination 10.0.0.9 , the router selects its associated next hop, which is 192.168.2.1 . This deterministic behavior ensures that traffic follows the most precise path calculated by the routing protocols or defined by the administrator, overriding broader routes like the default or summary advertisements.
Reference: Routing Fundamentals, Longest Prefix Match, Forwarding Table Selection.
NEW QUESTION # 26
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 # 27
Click the Exhibit button.
Referring to the exhibit, which command would be used to view the IP subnet addresses associated with prefix-list DIRECT-IP?
Answer: C
Explanation:
The prefix list uses apply-path to dynamically populate entries from interface addresses. The display inheritance option expands the applied path and shows the actual resolved IP subnets included in the prefix list.
NEW QUESTION # 28
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