NexusSec.Network Architecture & Design
We build the invisible highways of your data - scalable, secure, and resilient. Enterprise network services covering high-availability topologies with HSRP/VRRP redundancy, OSPF/BGP routing, and VLAN segmentation, designed by NexusSec for businesses in Navi Mumbai, Mumbai, and across India.
What is network architecture & design?
Network architecture and design is the planning and construction of a network's structure - its topology, routing, segmentation, and redundancy - so it is scalable, secure, and resilient as your business grows. A well-designed network is faster, easier to secure, and doesn't fall over when a single device fails.
NexusSec designs high-availability networks with HSRP/VRRP redundancy, optimised OSPF/BGP routing, and VLAN segmentation - the same principles used in enterprise and data-centre environments, tailored to your scale.
What we design & build
Resilient, structured networks engineered for uptime.
High-Availability Topologies
Redundant paths and devices so a single failure never takes you offline.
OSPF / BGP Routing
Optimised dynamic routing for fast convergence and efficient paths.
VLAN Segmentation
Logical segmentation for performance, isolation, and security.
HSRP / VRRP Redundancy
Gateway redundancy that keeps traffic flowing during failover.
Structured Cabling & Switching
Clean, documented physical and logical layouts.
Wireless & Access
Reliable, secure Wi-Fi and access-layer design.
How we design
From requirements to a documented, resilient live network.
Discover
Map current state, traffic, and growth requirements.
Design
Topology, routing, segmentation, and redundancy blueprint.
Build
Deploy and configure with minimal disruption.
Document & Support
Full documentation and ongoing support.
Signs your network needs redesigning
Most networks are not designed once; they accumulate. A switch here, a VLAN there, a temporary rule that became permanent. The result works until it doesn't. These are the symptoms we are called in for most often:
- Everything is on one flat network. Printers, CCTV, guest Wi-Fi, finance workstations and servers share a broadcast domain, so a single compromised device can reach all of them. This is the most common finding in our assessments.
- Nobody can produce a topology diagram. If the network exists only in one person's memory, every change is a risk and their departure is an incident.
- A single switch or link takes the business offline. No redundancy at the point where redundancy actually matters.
- Adding a site or floor takes weeks. Growth is painful because addressing and routing were never planned to extend.
- Wi-Fi is blamed for everything. Usually the symptom of an addressing, DHCP or uplink problem rather than the access points.
- IoT and building systems are on the corporate LAN. Cameras and controllers rarely receive patches and are a standing route inward.
A redesign does not always mean replacing hardware. Often the existing equipment is capable and the problem is addressing, segmentation and routing design - see assessment findings and network segmentation and VLAN design.
Network design questions, answered
What is network architecture & design?
The planning and construction of a network's topology, routing, segmentation, and redundancy so it is scalable, secure, and resilient.
What is high availability in networking?
The network keeps running even when a device or link fails, using redundancy protocols such as HSRP and VRRP and redundant paths.
What routing and segmentation do you implement?
OSPF and BGP dynamic routing, VLAN segmentation, and HSRP/VRRP redundancy, tailored to each environment.
Do you design networks for businesses in Mumbai?
Yes. NexusSec is based in Airoli, Navi Mumbai, and designs networks across Navi Mumbai, Mumbai, and India.
Can you redesign our network without taking the business offline?
Yes. A redesign is staged: the new addressing and segmentation plan is built alongside the existing network, then traffic is migrated segment by segment during maintenance windows. Nothing is cut over until the replacement path is tested.
Do you document the network you build?
Always, and it is a deliverable rather than an afterthought - topology diagrams, addressing plan, VLAN and routing tables, device inventory and configuration backups. If your current network has no documentation, producing it is usually the first phase of work.
Do we need high availability, or is it overspending?
It depends entirely on what an hour of downtime costs you. For a single office where staff can wait, a spare unit on the shelf may be enough. Where orders, production or clinical systems stop, HA pairs and redundant uplinks pay for themselves the first time they are used. We size this against your actual exposure rather than by default.
Will you work with our existing hardware and ISP?
Yes. We are vendor-neutral on design and will reuse anything that is capable and supported. Where equipment is genuinely past end-of-life or undersized we will say so and explain why, with the cost of keeping it stated alongside the cost of replacing it.
How long does a network redesign take?
Design and documentation for a single site typically takes one to two weeks, with implementation staged after that in agreed windows. Multi-site environments are phased per location. The design phase is deliberately not rushed - it is far cheaper to change a diagram than a live network.
Detail for the two sectors we see most
The pattern differs by industry. We publish specifics for manufacturing - plant, office and warehouse on one network, and the supplier security questionnaires OEM customers now send - and for logistics and freight, where a dropped yard link stops billing. Both cluster around the Navi Mumbai industrial belt, which is where we attend site.
What moves the price on a network design
Design work is quoted on the size of the estate and how much of it is currently understood. Four things move the number.
| Factor | What it changes |
|---|---|
| Discovery | Where no diagram exists, the first job is establishing what is actually there. This is the most commonly underestimated part and the one that makes the rest reliable. |
| Sites and users | Drives how many zones, links and devices the design has to account for. A single site with one server room is a different job from a plant, an office and a warehouse. |
| Zone count | Segmentation cost tracks the number of boundaries, not the number of devices. Most businesses need a handful of zones, not a dozen. |
| Design only, or implementation too | Some clients want the design and will have their own team build it. That is a smaller engagement and we are happy to do it that way. |
Typical shapes: a design for a single site is normally one to two weeks. Implementation runs alongside your operations rather than as a cutover, with policy deployed in monitor mode first so nothing breaks unannounced. See network segmentation for how that phasing works.
How we quote
The same way for every engagement, so there are no surprises in it.
- A free scoping call, about thirty minutes. What you have, how many sites and users, what is prompting the work. No cost and no obligation.
- A fixed price, in writing, before anything starts. Not an hourly rate, not an estimate that moves. If the scope changes mid-engagement we agree the change before doing it, not after.
- Hardware quoted separately and at cost visibility. We are an official partner of Sophos, Fortinet and WatchGuard, so you see what the appliance costs and what the work costs as two numbers rather than one bundled figure.
- No charge for telling you not to buy. If the scoping call ends with us saying your existing setup is fine, that call was still free.
Our VAPT pricing is published openly, from ₹35,000 for a single site. Almost nobody in this market publishes anything, which makes budgeting hard and bad quotes easy to hide. We publish where we can.
Build a network that doesn't fail
Talk to NexusSec about a resilient, high-availability network design for your business. We respond within 24 hours.
or email security@nexussec.org
