JNCIA-SEC case studies
JNCIA-SEC · Put your knowledge to work in context.
JNCIA-SEC is the Associate-level written credential in the Security track of the Juniper Networks Certification Program (JNCP). The program describes itself as "a multi-tiered program of written and hands-on lab exams," and the Security track runs JNCIA-SEC, JNCIS-SEC, JNCIP-SEC and JNCIE-SEC. JNCIA-SEC is therefore the entry point into a ladder that later becomes lab-based at the Expert level, which makes it the natural first written exam for engineers moving into Juniper firewall work. Who it suits: network and security engineers, administrators and operations staff who work with Juniper security platforms and want a vendor-recognised baseline before attempting the Specialist exam. The JNCIA-SEC case studies are 5 cases and about 3,157 words.
1Branch SRX Chassis Cluster Failover Drops Voice and SSH Sessions
Northwind Retail runs a two-node SRX345 chassis cluster at its headquarters, supporting 250 office users and two 300 Mbps ISP links. Both reth interfaces are in redundancy group 1, active on node 0.
680 words, about 3 min2Hairpin NAT for an Internal Web Server
An SRX1500 at a logistics company uses three zones: trust (10.20.0.0/16), dmz (172.16.10.0/24), and untrust (reth0.0). A public web server at 172.16.10.10 is published with a static NAT mapping to 203.0.113.10.
618 words, about 3 min3IPsec VPN Passes Only One Subnet Pair
Acme Manufacturing connects an SRX340 at headquarters to a Cisco ASA at a partner site. HQ uses 10.1.0.0/16 and 10.2.0.0/16; the partner uses 192.168.10.0/24 and 192.168.20.0/24.
610 words, about 3 min4Signature Update Breaks a Business Application on TCP 8080
MediTrust runs an SRX380 at a clinic. A homegrown inventory application uses TCP 8080 and is accessed by 60 pharmacy users through the trust-to-untrust policy.
631 words, about 3 min5Intermittent SaaS Stalls and a Logging Blind Spot
GreenLine Logistics has an SRX550M at its data center edge with a 1 Gbps transit link and about 40,000 concurrent sessions. Users report 2-3 second stalls when saving records to a SaaS application, several times per hour.
618 words, about 3 min