Network Security Senior Specialist

Req ID: 395010

NTT DATA strives to hire exceptional, innovative and passionate individuals who want to grow with us. If you want to be part of an inclusive, adaptable, and forward-thinking organization, apply now.

We are currently seeking a Network Security Senior Specialist to join our team in Noida, Uttar Pradesh (IN-UP), India (IN).

ZIA Administration

Configure and manage Zscaler Internet Access (ZIA).Implement URL filtering, SSL inspection, sandboxing, and cloud firewall policies.Troubleshoot internet access and traffic forwarding issues. Manage PAC files, GRE/IPsec tunnels, and forwarding profiles.

ZPA Administration

Deploy and manage Zscaler Private Access (ZPA). Configure App Connectors, Service Edges, and Application Segments. Support Zero Trust Network Access (ZTNA) initiatives. Troubleshoot application access and authentication issues.

Zscaler SD-WAN

Zscaler Zero Trust SD-WAN / Branch Connector architecture and administration. ZIA and ZPA integration and traffic forwarding based on destination and access requirements. Branch connectivity, ISP links, routing, DNS, DHCP, NAT, TCP/IP and subnetting. Deployment modes, branch configuration templates and zero-touch provisioning. Traffic forwarding policies, application-aware path selection and link resiliency. Troubleshooting traffic flow, connectivity, latency, packet loss and application access. Change management, implementation plans, rollback procedures and operational documentation.

IoT / OT Security

IoT/OT device discovery, classification and asset inventory. Understanding of device behavior, communication flows and east-west traffic. Zscaler OT/IoT Segmentation or Zero Trust Device Segmentation policy implementation. Device isolation, least-privilege access and microsegmentation. Protocol and port analysis, including TCP/UDP, DNS, HTTP/S, SSH, RDP and SMB. Safe enforcement of policies for legacy and agentless devices. Troubleshooting legitimate communication blocks and minimizing production disruption. Incident investigation, traffic baselining and security policy validation.

Security Operations

Monitor security incidents and analyze logs.

Investigate threats, policy violations, and anomalous activities.

Work with SOC, Network, and Endpoint teams during incident response.

Integration & Automation

Integrate Zscaler with:

Azure AD / Entra ID , Okta , Active Directory , SIEM platforms (Microsoft Sentinel, Splunk, QRadar) , Automate operational tasks using PowerShell, Python, or APIs.

Troubleshooting - Diagnose issues related to:

PAC files , ZCC (Zscaler Client Connector) , Authentication , SSL decryption , DNS resolution , Proxy forwarding , Application access

Required Technical Skills

Zscaler Internet Access (ZIA) , Zscaler Private Access (ZPA) , Zscaler Client Connector (ZCC) , SSL Inspection , PAC File Management , GRE/IPsec Tunnels , Network Security , TCP/IP, DNS, HTTP/HTTPS , Authentication Technologies (SAML, MFA, LDAP)

Security Knowledge

Zero Trust Architecture , Secure Web Gateway (SWG) , CASB , DLP , Cloud Security

Preferred Skills

Microsoft Entra ID (Azure AD) , Microsoft Defender Suite , Sentinel SIEM , Cisco, Palo Alto, Check Point firewalls , Scripting (PowerShell/Python)

Experience

6 + years of Network Security experience.

4 + years of hands-on experience with ZIA and/or ZPA.

Experience in enterprise cloud security environments.

Certifications (Preferred)

ZTNA ( Zscaler Digital Transformation Administrator ) EDU 200

ZDTE ( Zscaler Digital Transformation Engineer )n EDU 202

Academic Qualifications and Certifications:

• Bachelor's degree or equivalent qualification in IT/Computing (or demonstrated equivalent work experience).
• CCNP or equivalent certification.

About NTT DATA

NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services. our consulting and Industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D.

Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client’s needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in-office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees. NTT DATA recruiters will never ask for payment or banking information and will only use @nttdata.com, @nttdatafed.com and @talent.nttdataservices.com email addresses. If you are requested to provide payment or disclose banking information, please submit a contact us form, https://us.nttdata.com/en/contact-us.

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