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NEW QUESTION # 40
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
Answer: C
Explanation:
Junos OS firewall filters operate on a sequential, "first-match" logic, but their behavior is significantly influenced by the use of terminating versus non-terminating actions. In this exhibit, a packet with a source address of 10.0.0.0/8 is evaluated against the filter named test.
Evaluation begins with term 1. The packet matches the source-address criteria, triggering the actions defined in the then statement. The first action is log, which sends the packet header information to the firewall task buffer for logging. The second action is next term. This is a critical non-terminating action; it instructs the Packet Forwarding Engine (PFE) to continue the evaluation process using the subsequent term in the filter rather than stopping after the match.
Evaluation then moves to term 2. Because term 2 contains no from match conditions, it acts as a
"catch-all" for any traffic that reaches it. The action in this term is reject. This is a terminating action that discards the packet and sends an ICMP "destination unreachable" message back to the source. Therefore, the packet is first recorded by the logging process and is subsequently dropped by the rejection mechanism. If next term had not been present in term 1, the packet would have been implicitly accepted (as any matched term without a terminating action like discard, reject, or accept defaults to an implicit accept in that specific term). However, the explicit instruction to move forward ensures the packet hits the reject statement.
NEW QUESTION # 41
A network administrator must set up the initial configuration of the out-of-band management interface on a new Juniper router to ensure management traffic is isolated from the default routing table (inet.0). In this scenario, which configuration step is required to accomplish this task in Junos OS?
Answer: A
Explanation:
In modern Junos OS versions, the most efficient and standard way to isolate Out-of-Band (OOB) management traffic from transit traffic is by utilizing the management-instance . Historically, management interfaces like fxp0 (on M/MX/T series) or me0 (on EX/QFX series) shared the global routing table (inet.0), which could lead to routing conflicts if management subnets overlapped with production data.
To resolve this, Junos introduced the set system management-instance command. When this is enabled, the OS automatically creates a dedicated routing instance named mgmt_junos. The physical management interface (be it fxp0, em0, or me0) and its associated logical unit are moved into this private instance. This creates a complete separation: management protocols like SSH, SNMP, and NTP operate within mgmt_junos, while BGP, OSPF, and customer data remain in inet.0. This architecture ensures that even a massive routing loop or table exhaustion in the production plane will not prevent an administrator from accessing the device via the OOB port. Furthermore, it simplifies the configuration of default gateways for management traffic, as the mgmt_junos instance maintains its own independent routing table (mgmt_junos.inet.0), preventing management routes from ever being leaked into the provider core.
Reference: Operational Monitoring and Maintenance, Management Instance, OOB Management.
NEW QUESTION # 42
What are two requirements for root password recovery in Junos? (Choose two.)
Answer: A,D
Explanation:
Root password recovery requires physical console access to interrupt the boot process. The device must be rebooted to enter single-user mode and reset the root password.
NEW QUESTION # 43
Exhibit:
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: B
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.
Reference: Routing Policy and Firewall Filters, Firewall Filter Evaluation, Implicit Discard.
NEW QUESTION # 44
Which component is considered part of the data plane?
Answer: C
Explanation:
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.
NEW QUESTION # 45
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