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NEW QUESTION # 51
Which two functions are performed by the PFE? (Choose two.)
Answer: C,D
Explanation:
The Packet Forwarding Engine (PFE) in Junos OS performs several key functions, including implementing firewall filters (A) and forwarding transit traffic (C). The PFE applies firewall filter rules to incoming and outgoing traffic and is responsible for the high-speed forwarding of packets based on the information in the forwarding table.
NEW QUESTION # 52
Click the Exhibit button.
Referring to the exhibit, which two actions will occur when a packet matches the firewall filter? (Choose two.)
Answer: A,D
Explanation:
In Junos OS, firewall filters are constructed using terms that specify match criteria (the from statement) and actions to be taken (the then statement). When a packet enters an interface where this filter is applied, the Packet Forwarding Engine (PFE) evaluates it against the defined terms. In this exhibit, the term limit-icmp targets packets sourced from the 172.25.11.0/24 network that specifically use the ICMP protocol.
When a packet meets both criteria, the actions defined in the then block are triggered:
* count count-icmp; : This is a non-terminating action . It instructs the system to increment a specific software counter named count-icmp. This allows administrators to monitor exactly how many packets are hitting this specific term using the show firewall command.
* discard; : This is a terminating action . It immediately stops any further evaluation of the packet and drops it. A key characteristic of the discard action in Junos is that it is a " silent " drop; the router simply deletes the packet from its buffer without notifying the sender.
Option D is incorrect because returning an ICMP destination unreachable message is the specific behavior of the reject action, not the discard action. Option C is incorrect because discard explicitly prevents the packet from being forwarded. Understanding the distinction between silent discards and active rejections is essential for architects when designing security policies that balance stealth with network transparency.
Reference: Routing Policy and Firewall Filters, Firewall Filter Actions, Standard Firewall Filters.
NEW QUESTION # 53
Which advantage is provided by multiple software processes running in the Junos OS?
Answer: C
Explanation:
Multiple software processes in Junos OS run in separate, protected memory spaces, which increases system stability and reliability by isolating faults to individual processes.
NEW QUESTION # 54
Which two statements are correct about Junos OS? (Choose two.)
Answer: A,B
Explanation:
Junos OS is built with a modular architecture where individual processes run independently, improving stability and fault isolation. It also separates the control plane (Routing Engine) from the forwarding plane (Packet Forwarding Engine), enhancing performance and reliability.
NEW QUESTION # 55
Your switch01 device lost network connectivity after a configuration change. You must recover the device to a known working state using the rescue configuration that was previously saved.
The device is only accessible using the console. In this scenario, which command sequence will successfully restore the rescue configuration?
Answer: A
Explanation:
In Junos OS, the rescue configuration is a specifically designated file that stores a known-working configuration, intended to be used for emergency recovery when the device becomes unreachable or unstable due to recent changes. This configuration is not created automatically; an administrator must proactively save a stable state using the operational mode command request system configuration rescue save. This differs from the standard rollback archive, which automatically stores up to 50 previous configurations but can eventually rotate out the specific
"last known good" state needed for recovery.
When a device loses network connectivity, console access becomes the only viable management path. To restore the rescue configuration, the administrator must enter configuration mode using the configure command. Once inside the candidate configuration buffer, the rollback rescue command is issued. This command directs the Junos OS to locate the designated rescue file and load its contents over the current candidate configuration. Upon receiving the "load complete" confirmation, the administrator must execute a commit to promote the candidate configuration to the active, running state. Sequence C correctly follows this logic. Sequence A is technically incorrect for standard rescue restoration as load override typically targets specific file paths or URLs, whereas rollback rescue is the built-in mechanism for this function. Sequences B and D are destructive or counter-productive, either deleting the rescue file or overwriting it with the current, non-functional configuration state.
NEW QUESTION # 56
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