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When traffic enters an interface, which two results does a route lookup determine? (Choose two.)
A. DNS name
B. ingress interface
C. egress security zone
D. egress interface
Answer: C,D
Explanation:
When a packet enters an SRX interface, aroute lookupis performed:
* It determines theegress interface(Option B) by checking the destination IP against the routing table.
* Once the egress interface is known, its associatedegress security zone(Option D) is also determined.
* Theingress interface (Option A)is already known when the packet arrives, so the route lookup does not determine it.
* DNS name (Option C)NS is unrelated to routing lookups.
Correct Results:egress interface, egress security zone
Reference:Juniper Networks -Packet Flow and Route Lookup, Junos OS Security Fundamentals.
NEW QUESTION # 18
What is the purpose of rate-limiting exception traffic in the Junos OS?
A. to simplify the configuration of network interfaces
B. to enhance the performance of the forwarding plane
C. to manage routing protocols and updates
D. to prevent denial-of-service attacks on the Routing Engine
Answer: D
Explanation:
Exception traffic is traffic that must be sent from the Packet Forwarding Engine (PFE) to the Routing Engine (RE) for processing, such as routing protocol updates, management traffic, or other control-plane packets.
Because the RE is a limited and critical resource, Junos OS implementsrate limiting on exception traffic.
* The purpose is toprevent denial-of-service (DoS) attacks on the Routing Engineby controlling the amount of traffic directed to it.
* This ensures the RE continues to process control-plane operations reliably, even under potential attack or heavy traffic conditions.
* Rate limiting does not enhance forwarding plane performance (Option A), simplify interface configuration (Option B), or manage routing protocols directly (Option D).
Reference:Juniper Networks -Junos OS Security Fundamentals, Exception Traffic Handling.
NEW QUESTION # 19
When does screening occur in the flow module?
A. during route lookup
B. during policy lookup
C. before session lookup
D. after session lookup
Answer: C
Explanation:
In Juniper SRX flow-based packet processing, theflow moduleis responsible for security functions such as screening, session management, NAT, and policy enforcement. The processing order is critical:
* Screens are applied before any session lookup.This ensures that packets are inspected for anomalies, floods, or protocol violations before consuming resources for session management. Examples of these screens include TCP SYN flood protection, ICMP flood protection, and port scanning protection.
* After screening, thesession lookupoccurs. At this point, the firewall checks whether the packet belongs to an existing session in the session table. If a matching session is found, the packet bypasses policy evaluation and is forwarded according to the session state.
* If no existing session is found, the packet continues throughroute lookup, NAT processing, and security policy evaluationbefore a new session is created.
Thus,screening occurs before the session lookup, protecting the system early in the flow process. This design ensures efficiency by dropping malicious or malformed traffic before allocating session resources.
Reference:Juniper Networks -SRX Series Services Gateways Security Processing (Flow Module Sequence), Junos OS Security Fundamentals, Official Course Guide.
NEW QUESTION # 20
Click the Exhibit button.
You must ensure that sessions can only be established from the external device.
Referring to the exhibit, which type of NAT is being performed?
A. static PAT only
B. destination NAT only
C. source NAT only
D. static NAT and source NAT
Answer: B
Explanation:
From the exhibit:
* The internal host (172.25.11.101) is located in theTrust zone.
* The external address (203.0.113.199/30) is used for communication with the ISP.
* The requirement is thatsessions can only be initiated from the external device(the ISP or untrust side) toward the internal host.
This requirement matches the behavior ofDestination NAT:
* Destination NAT only (Option A):Maps the external/public IP (203.0.113.199) to the internal/private IP (172.25.11.101). This allows inbound connections to be translated and sent to the internal host. The internal host cannot initiate outbound sessions, since the translation only applies to inbound traffic.
* Source NAT only (Option B):Used for outbound sessions from internal private IPs to the Internet.
This does not meet the requirement.
* Static PAT (Option C):Maps a single port of a public IP to a private IP/port. The exhibit does not indicate a port-based translation.
* Static NAT and source NAT (Option D):Would provide bidirectional communication, allowing sessions to be initiated in both directions. This contradicts the requirement.
Correct NAT Typeestination NAT only
Reference:Juniper Networks -NAT Types (Source NAT, Destination NAT, Static NAT), Junos OS Security Fundamentals.
NEW QUESTION # 21
Which two criteria would be used for matching in security policies? (Choose two.)
A. source address
B. interface name
C. applications
D. MAC address
Answer: A,C
Explanation:
Security policies in Junos OS match traffic based on specific criteria:
* Source and destination addresses(Option B).
* Application(Option D), which may be defined as services (e.g., tcp/80) or recognized through AppID.
Other options:
* MAC addresses(Option A) are not used in policy matching; policies operate at Layer 3/4.
* Interface name(Option C) is used in firewall filters, not in security policy definitions.
Correct Criteria:Source address and Applications
Reference:Juniper Networks -Security Policy Match Conditions, Junos OS Security Fundamentals.
NEW QUESTION # 22
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NS is unrelated to routing lookups.