What is a purpose for creating multiple routing instances on an SRX Series Firewall device?
Answer(s): B
Multiple routing instances (such as virtual routers or VRFs) can be configured on an SRX to provide separation of routing tables. This enables:Maintaining separation of routing information (Option B): Different departments, tenants, or customers can have their own independent routing domains for security and isolation.SNMP monitoring (Option A) is unrelated to routing instances.Routing protocols (Option C) can be run inside each instance, but the purpose of multiple instances is separation, not general routing protocol management.Simplifying interface configuration (Option D) is not a function of routing instances.Correct Purpose: To maintain separation of routing information for security purposes.
Juniper Networks – Routing Instances and Virtual Routers, Junos OS Security Fundamentals.
Your manager asks you to verify when your antivirus definitions were last updated on your SRX Series Firewall.Which operational mode command allows you to see this information?
Answer(s): D
The antivirus feature on SRX relies on signature definition files that must be regularly updated. To check the status of these updates, the correct operational command is:show security utm anti-virus status (Option D). This displays details such as:Antivirus engine statusLast update time of virus definitionsVersion of the signature databaseOther options:Content-filtering statistics (Option A) shows counters for file-type filtering, not antivirus updates.Anti-spam status (Option B) shows spam filtering engine connectivity.Web filtering status (Option C) shows SBL/web filter server connection details.Correct Command: show security utm anti-virus status
Juniper Networks – UTM Antivirus Commands and Monitoring, Junos OS Security Fundamentals.
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?
Answer(s): A
From the exhibit:The internal host (172.25.11.101) is located in the Trust zone.The external address (203.0.113.199/30) is used for communication with the ISP.The requirement is that sessions can only be initiated from the external device (the ISP or untrust side) toward the internal host.This requirement matches the behavior of Destination 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 Type: Destination NAT only
Juniper Networks – NAT Types (Source NAT, Destination NAT, Static NAT), Junos OS Security Fundamentals.
Click the Exhibit button.Referring to the exhibit, which two statements are correct? (Choose two.)
Answer(s): A,B
From the exhibit:The user attempted to access https://www.wikipedia.org.The block page indicates:CATEGORY: NG_ReferenceREASON: BY_PRE_DEFINEDThe header states: “Juniper Web Filtering has been set to block this site.”Analysis of options:Option A: Correct. The log shows “REASON: BY_PRE_DEFINED,” which means the site was blocked because it matched a predefined category in the Web filtering database.Option B: Correct. The category “NG_Reference” indicates that the NextGen (Enhanced/Cloud-based) Web Filtering type is being used.Option C: Incorrect. The exhibit does not provide any information about SSL proxy configuration; it only shows that the HTTPS site was blocked.Option D: Incorrect. The block page shown is the standard Juniper default block page, not a custom message.Correct Statements: The URL matches a predefined Web filtering category, and the NextGen Web Filtering type is being used.
Juniper Networks – Web Filtering (SurfControl, Enhanced, and NextGen Web Filtering), Junos OS Security Fundamentals.
Answer(s): A,C
From the exhibit output:Policy Information:Policy: https-access, action-type: permitFrom zone: Trust, To zone: UntrustApplication: junos-httpsIP protocol: tcp, Destination port: 443Inactivity timeout: 1800Sequence number: 1Analysis:Option A: Correct. The default inactivity timeout for flow sessions is 60 seconds for TCP without activity. This policy shows an inactivity timeout of 1800 seconds, which is non-default.Option B: Incorrect. The policy shows Sequence number: 1, which means it is the first policy, not the second.Option C: Correct. The policy explicitly matches application junos-https (TCP port 443) and has an action of permit. Therefore, it allows HTTPS traffic.Option D: Incorrect. This is clearly a zone-based policy, but the question asks for two correct statements. Between the four options, the explicitly correct ones are A and C.Correct Statements: This security policy uses a non-default inactivity timeout, and this security policy permits HTTPS traffic.
Juniper Networks – Security Policy Configuration and Defaults, Junos OS Security Fundamentals.
You need to capture control plane traffic on a high-end SRX Series device.How would you accomplish this task?
On high-end SRX platforms, control-plane (Routing Engine–destined) traffic transits the loopback (lo0) and is best captured by applying a firewall filter on lo0 with the then sample action, together with traffic sampling under forwarding-options to write packets to a file.sample sends matched control-plane packets to the sampling process, which can record them for analysis.datapath-debug capture focuses on data-plane/SPC paths and is not the tool for generic control-plane packet capture.tcpdump from shell is not the supported workflow on SRX; the operational command is monitor traffic, but for high-end control-plane capture, the recommended and scalable method is lo0 filter + sampling.Port mirroring mirrors transit data-plane traffic, not RE-destined control-plane packets.
Juniper Networks – Junos OS Security Fundamentals, “Capturing Control-Plane Traffic (lo0 filters and sampling).”
You are asked to reduce security configuration complexity on your external facing firewalls. You notice that a previous administrator included hundreds of private subnet NAT rules covering various RFC1918 addresses. You want to replace all these rules with a single rule covering all RFC1918 addresses.Which rule would you use in this scenario?
RFC 1918 defines three private IPv4 blocks:10.0.0.0/8172.16.0.0/12192.168.0.0/16Option A exactly matches these ranges in a single source NAT rule, replacing numerous per-subnet entries.Options B and C contain invalid/non-RFC1918 networks (e.g., 192.16.0.0/12, 172.168.0.0/16).Option D incorrectly adds documentation network 192.0.2.0/24, which is not RFC1918.
Juniper Networks – Junos OS Security Fundamentals, “Source NAT Matching” and RFC 1918 private address ranges.
What must also be enabled when using source NAT if the address pool is in the same subnet as the interface?
When source NAT uses a pool of addresses from the same subnet as the egress interface, the firewall must respond to ARP requests for those NAT pool IPs. Without this, upstream devices would not know how to forward traffic destined for those IPs.Proxy ARP is required (Option D). It enables the SRX to answer ARP requests on behalf of the NAT pool addresses.Static NAT (Option A) is unrelated and maps one-to-one, not required here.Dynamic DNS (Option B) has no relation to NAT pools.Destination NAT (Option C) applies to inbound translations, not outbound source NAT pools.Correct Feature: Proxy ARP
Juniper Networks – Source NAT Pools and Proxy ARP, Junos OS Security Fundamentals.
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