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NEW QUESTION # 87
What will the request system configuration rescue save command do?
Answer: C
Explanation:
The "request system configuration rescue save" command in Junos OS saves the most recently committed configuration as the rescue configuration, making A the correct answer. This feature allows administrators to set a known good configuration that can be quickly reverted to in case of configuration errors or issues.
NEW QUESTION # 88 
Referring to the exhibit using the show route 192.168.100.100 command output, over which interface will the traffic be forwarded?
Answer: C
Explanation:
In the Junos OS architecture, the Routing Engine (RE) manages path selection by evaluating multiple potential routes to a specific destination found within the Routing Information Base (RIB). When multiple routing sources (such as static configuration, OSPF, IS-IS, and BGP) provide information for the exact same destination prefix-in this case, 192.168.100.100/32 -the device utilizes route preference as the primary tie- breaker to determine which entry becomes the " active " route.
The provided exhibit displays the default preference values for each protocol: Static is 5 , OSPF is 10 , IS-IS is 15 , and BGP is 170 . Junos OS follows a " lower is better " logic for preference; therefore, the Static route is selected as the most trustworthy path. In the command output, the active route is explicitly identified by the asterisk (*) and plus sign (+) symbols located next to the [Static/5] entry. Looking at the specific next-hop information for this active static route, the output indicates the traffic is sent to 192.168.0.2 via xe-0/0/0.0 .
Consequently, the Packet Forwarding Engine (PFE) will install this specific path into the forwarding table, causing all traffic destined for 192.168.100.100 to be egressed over the xe-0/0/0.0 interface.
Reference: Routing Fundamentals, Route Preference, and Routing Table Output Interpretation.
NEW QUESTION # 89
Which protocol is responsible for learning an IPv4 neighbor's MAC address?
Answer: C
Explanation:
The Address Resolution Protocol (ARP) is a fundamental protocol used in IPv4 networking to map an IP address to its corresponding MAC (Media Access Control) address. When an IPv4 device wants to communicate with another device on the same local network, it uses ARP to find out the MAC address associated with the target device's IP address. This ensures that IP packets can be encapsulated into Ethernet frames and delivered to the correct hardware address on the local network segment. ARP does not apply to IPv6, where Neighbor Discovery Protocol (NDP) performs a similar function.
NEW QUESTION # 90
Exhibit:
Referring to the exhibit, which route will be selected for a packet destined to IP address 10.50.10.55?
Answer: C
Explanation:
In Junos OS, the Routing Information Base (RIB) selection process follows a strict hierarchy where the Longest Prefix Match (LPM) is the absolute primary tie-breaker. When a packet is destined for 10.50.10.55
, the Routing Engine searches the inet.0 table for all matching entries. In this exhibit, four routes match: the default route ( 0.0.0.0/0 ), a general static route ( 10.0.0.0/8 ), an OSPF route ( 10.50.0.0/16 ), and a BGP route ( 10.50.10.0/24 ).
The LPM rule dictates that the router must select the most specific route available, which is defined as the entry with the highest number of matching bits in the subnet mask. The 10.50.10.0/24 route matches 24 bits of the destination address, making it more specific than the 16-bit, 8-bit, or 0-bit alternatives. It is critical to understand that route preference (e.g., Static at 5, OSPF at 10, or BGP at 170) is only evaluated if there are multiple paths to the exact same prefix and length. Because these prefixes vary in length, the length takes precedence over the protocol preference. Therefore, the BGP-learned route via 192.168.1.20 is selected as the active path, ensuring traffic follows the most granular routing information provided to the device. Reference:
Routing Fundamentals, Routing Table Selection, Longest Prefix Match.
NEW QUESTION # 91
Which statement accurately describes the Junos candidate configuration?
Answer: C
Explanation:
In the Junos OS architecture, the configuration environment is strictly bifurcated to ensure system stability and integrity. The candidate configuration is a specific database that serves as a staging area, storing all proposed changes made by an administrator during a configuration session before they are finalized. Unlike other network operating systems where changes might take effect immediately upon entry, Junos utilizes this
" sandbox " approach where modifications reside only in the candidate database until a commit command is explicitly executed.
Once the commit process is initiated, the Junos OS kernel validates the candidate configuration for syntax errors and logical consistency. If the validation check is successful, the candidate configuration is promoted and becomes the active configuration-the operational state currently running on the device hardware. This separation allows multiple administrators to work on complex changes without impacting live transit traffic or device stability prematurely. If a mistake is identified during the editing process, the candidate configuration can be easily discarded or compared against the active state to identify discrepancies. This workflow is a cornerstone of Junos OS, facilitating a " check-before-apply " methodology that is essential for carrier-grade reliability and minimizing the risk of accidental outages during critical maintenance windows. Reference:
Junos OS Fundamentals, Configuration Databases, Candidate vs. Active.
NEW QUESTION # 92
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