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NEW QUESTION # 45
Which Junos tool should you use to identify the path that packets take through the network to a destination?
Answer: C
Explanation:
When you need to visualize the hop-by-hop journey of a packet across a multi-vendor or Junos-based network, traceroute is the definitive operational tool. Unlike ping , which merely confirms end-to-end reachability by eliciting an Echo Reply, traceroute provides a clinical breakdown of every Layer 3 device (router or switch) in the path.
The mechanics of this tool are quite clever: it sends out a sequence of packets (usually UDP or ICMP) with an increasing Time-to-Live (TTL) value, starting at 1. When the first router receives the packet, it decrements the TTL to 0, discards the packet, and sends an ICMP " Time Exceeded " message back to the source. This informs your Junos device of the first hop ' s identity. This process repeats, incrementing the TTL each time, until the packet reaches the final destination. This path discovery is vital for identifying where traffic might be diverted by a misconfigured routing policy or where latency is being introduced in the network fabric. While monitor interface traffic gives you real-time throughput on a local port and SNMP provides historical telemetry to a management station, neither can map the external topological path like traceroute. In the Junos CLI, you can even specify the source address or bypass the routing table to test specific egress paths.
Reference: Operational Monitoring and Maintenance, Troubleshooting Network Connectivity.
NEW QUESTION # 46
Referring to the exhibit, which route will be selected for a packet destined to IP address
10.50.10.55?
Answer: B
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.
NEW QUESTION # 47
Which two statements are correct about SNMPv3? (Choose two.)
Answer: B,D
Explanation:
Simple Network Management Protocol version 3 (SNMPv3) represents a significant security evolution over its predecessors, SNMPv1 and SNMPv2c. While earlier versions relied on " community strings " sent in plain- text-which are easily intercepted and provide minimal security-SNMPv3 introduces a comprehensive security framework known as the User-based Security Model (USM). The primary benefit of SNMPv3 is that it protects against tampering and eavesdropping. It achieves this through two main mechanisms: message integrity (authentication), which ensures that a packet has not been altered in transit, and data confidentiality (privacy), which encrypts the payload of the SNMP packets using advanced algorithms like AES or DES.
Furthermore, SNMPv3 provides for secure communication by utilizing encrypted credentials rather than cleartext strings. Administrators define specific users and assign them security levels: noAuthNoPriv, authNoPriv, or authPriv. In the most secure mode (authPriv), the system requires both a password for authentication (validated via MD5 or SHA hashes) and a separate password for encryption. This architecture ensures that management traffic-including sensitive device telemetry and configuration data-remains confidential and authenticated as it traverses the network. While SNMPv3 is inherently more complex to configure than SNMPv2c due to these additional security parameters, it is the required standard for any production Junos environment where management plane integrity is a priority.
Reference: Operational Monitoring and Maintenance, SNMP Management and Security.
NEW QUESTION # 48
Referring to the exhibit, which two actions will occur when a packet matches the firewall filter?
(Choose two.)
term limit-icmp { from {
source-address {
172.25.11.0/24;
}
protocol icmp;
}
then {
count count-icmp; discard;
}
}
Answer: B,C
Explanation:
Referring to the firewall filter configuration in the exhibit, when a packet matches the specified term limit-icmp, two actions are defined in the then statement: count count-icmp and discard. The count count-icmp action means that each time a packet matches this term, a counter named count-icmp will be incremented, providing a tally of how many packets have matched the term.
The discard action means that the packet will be dropped and not forwarded through the device.
This effectively prevents the packet from reaching its intended destination. There is no action specified that would cause an ICMP destination unreachable message to be returned, nor is there any action that would allow the packet to be forwarded.
NEW QUESTION # 49
What are two characteristics of IPv6 addressing? (Choose two.)
Answer: B,D
Explanation:
IPv6 addresses are 128 bits in length, providing a vastly larger address space than IPv4.
Addresses beginning with fe80 are link-local and are not routable beyond the local network segment.
NEW QUESTION # 50
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