Cisco RSTECH 100-490 Practice Test Questions, Cisco RSTECH 100-490 Exam Practice Test Questions

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Cisco 100-490 RSTECH: Legacy Routing & Switching Support and the 800-150 Replacement

Cisco 100-490 RSTECH is a retired CCT Routing & Switching exam. Cisco records February 9, 2025 as its last day to test and lists 800-150 FLDTEC as the replacement. That retirement puts the old RSTECH code in a useful but clearly historical role: it can still help technicians understand the field-support fundamentals Cisco emphasized, but it is not a current certification target in 2026.

The old exam concentrated on supporting routing and switching hardware at the technician level. It was less about designing routing policy and more about identifying equipment, understanding network fundamentals, connecting to devices, collecting information, replacing hardware, and solving straightforward Layer 1 and Layer 2 problems under a controlled support process. The current field-technician certification preserves many of those operational skills while expanding beyond routing and switching into data center, UCS, and collaboration platforms.

Cisco retired 100-490 at the same time as the former data-center and collaboration CCT exams. The current destination is 800-150 FLDTEC, Supporting Cisco Devices for Field Technicians. Cisco describes FLDTEC as covering on-site replacement work across routing, switching, data center, UCS, and collaboration, including hardware identification, cabling, configuration backup and restoration, and software upgrades or downgrades.

For a learner who finds RSTECH in an old course, the important first step is therefore to separate legacy technical content from current certification requirements. An old RSTECH blueprint can explain why technicians need to understand cables, interfaces, Cisco hardware, console access, and basic troubleshooting. It cannot tell you the current exam's full scope or current platform emphasis.

Within Cisco, the transition represents a consolidation of technician roles rather than a simple rename. The modern CCT Field Technician credential expects one technician foundation that spans multiple infrastructure families.

What the old RSTECH role was really about

The Routing & Switching technician role existed at the operational edge of the networking team. A technician might be sent to a site because a router failed, a switch would not boot correctly, a module needed replacement, or remote engineers needed someone to verify physical connectivity. The work required precise execution more than architectural authority.

That distinction explains why RSTECH candidates needed to understand network fundamentals without being expected to perform every task associated with CCNA or CCNP. Knowing how a switch forwards frames or why a router connects IP networks helps the technician interpret symptoms. But the job may still require following a remote engineer's instructions rather than independently redesigning VLANs, routing, or security policy.

The transferable lesson is role discipline. Confirm the ticket, identify the exact device, record the pre-change state, perform the approved action, verify the result, and escalate when the observed condition falls outside the procedure. That method limits risk in production environments.

Hardware identification and the physical network

RSTECH preparation historically placed strong emphasis on Cisco routers, switches, modules, ports, transceivers, and common cabling. A field technician must know what is physically in front of them before they can safely act. Similar-looking ports can serve very different functions, and a component that fits a slot may still be unsupported or intended for another platform.

Copper and fiber knowledge belongs to this layer. Technicians should recognize that media type, connector, transceiver compatibility, polarity, cable condition, distance, and interface state all influence whether a link comes up. The practical importance of Ethernet cabling is not the ability to recite categories; it is the ability to use physical evidence to narrow a fault before changing configuration.

Power supplies, fans, and modular hardware also require procedural care. Redundancy does not justify removing a component without confirming the intended action. The correct component, slot, and hardware state have to be established first. In field support, small identification mistakes can create large outages.

Network fundamentals behind technician troubleshooting

Even hardware-focused work needs a basic network model. A technician should understand the difference between Layer 1 connectivity, Layer 2 switching, and Layer 3 routing. A port can have physical link while traffic still fails because of VLAN, addressing, routing, or policy problems. Conversely, an apparent "routing" problem can still be caused by a bad cable or disabled interface.

Basic IPv4 addressing, subnet masks, default gateways, and common protocols help the technician decide whether an observation is plausible. If the assigned address is in a different network from the expected gateway, that matters. If the interface has no physical link, a route-table discussion is premature. If local reachability works but remote reachability does not, the diagnostic boundary moves.

This layered reasoning is why network-connectivity troubleshooting remains valuable even though the RSTECH code itself is retired. Good technicians move from observable facts toward more specific hypotheses instead of making random changes.

Console access, Cisco IOS awareness, and evidence collection

A field technician may need to connect locally to a device when remote access is unavailable. That makes console access a foundational skill: use the correct console connection, terminal settings, authentication method, and support procedure. The goal is not necessarily to make configuration changes. Often the immediate task is to collect status information for a remote engineer.

Cisco IOS awareness supports that process. A technician should be able to recognize basic command-line context and understand that show commands provide evidence about interfaces, software, hardware inventory, configuration, and system state. The important skill is interpreting the output safely enough to answer the support question without drifting into unauthorized changes.

Evidence should be precise. Device hostname, model, serial number, software version, interface state, link indicators, boot messages, and timestamps can all matter. A screenshot or copied output is useful only if it clearly belongs to the device and time being investigated. Accurate evidence shortens remote diagnosis and reduces the chance that the wrong component is replaced.

Layer 1 and Layer 2 faults a field technician should recognize

Many field incidents begin below the routing layer. A damaged cable, disconnected patch lead, wrong optic, disabled port, failed module, speed or duplex issue, or incorrect VLAN placement can all prevent traffic from reaching the point where routing becomes relevant. The technician does not need to guess which one is responsible; they need a method for testing the possibilities.

Start with the physical state. Is the interface powered and connected? Is the expected cable present? Do link indicators behave normally? Does a known-good component change the result? Then move to Layer 2 evidence: is the switch port operational, is the expected VLAN present, and does the device learn MAC addresses as expected?

This progression is deliberately conservative. Field technicians often work under time pressure, but changing configuration before verifying physical and Layer 2 conditions can hide the original symptom or create a second problem. RSTECH's lasting value lies in reinforcing that order of operations.

How the old CCT tracks were consolidated

RSTECH was one of three separate CCT technician exams. 010-151 DCTECH covered the data-center-oriented technician track, while 100-890 CLTECH focused on collaboration endpoint support. Cisco retired all three on February 9, 2025 and directed candidates to 800-150 FLDTEC.

That shared replacement makes the current role easier to understand. Instead of certifying a technician separately for each platform family, Cisco now validates a common set of field-support skills across them. A technician may need to identify a Catalyst switch in one job, a Nexus device or UCS component in another, and a collaboration endpoint in a third.

The unifying tasks are operational: hardware identification, cabling, access, evidence collection, backup or restoration, software handling, replacement, and verification. Legacy RSTECH preparation covers only the routing-and-switching portion of that wider field.

Which RSTECH knowledge still matters

The most durable knowledge is conceptual and procedural. Ethernet fundamentals still matter. Router and switch roles still matter. Console access still matters. Physical-layer troubleshooting still matters. Inventory and serial-number collection still matter. A careful pre-change and post-change verification process still matters.

Product details age more quickly. Specific router families, module names, software behaviors, and licensing assumptions in old RSTECH material may no longer reflect the current environment. A modern technician should therefore use current Cisco documentation for platform-specific actions even when the underlying support principle is familiar.

This separation prevents two mistakes. The first is discarding useful legacy knowledge because the exam retired. The second is treating every old detail as current because it once appeared in an official objective. Good technical maintenance keeps the principle and refreshes the implementation.

A practical migration from RSTECH study to FLDTEC study

Someone who has already studied 100-490 can reuse a meaningful portion of that effort. Keep the network fundamentals, physical cabling, router and switch identification, console workflow, and basic fault-isolation skills. Then compare those areas with the current 800-150 blueprint and identify what the old track did not cover in enough depth: data-center devices, UCS, collaboration systems, current software management, and the broader cross-platform replacement workflow.

Labs should reflect that broader scope. Practice identifying several Cisco platform families rather than one. Work through a configuration-backup and restoration scenario in a safe lab. Review software-image handling concepts. Trace physical connectivity. Practice collecting device state before a hypothetical replacement and validating it afterward.

Avoid building the plan around old question counts, old exam timing, or an old product list. Those are historical properties of RSTECH, not current FLDTEC requirements. The current blueprint is the authority for certification preparation.

The correct 2026 interpretation of 100-490. In 2026, 100-490 should be presented as a retired CCT Routing & Switching exam with a clear successor: 800-150 FLDTEC. It is still useful when a reader wants to understand the older technician role or extract durable routing-and-switching support fundamentals, but it should never be described as a current testing option.

The transition also tells candidates something about the job itself. Field technicians increasingly need broad device literacy and disciplined service workflows across multiple infrastructure families. The old routing-and-switching specialization has become one part of a more unified support credential.

For a new candidate, the path is therefore direct: use RSTECH material selectively for legacy context, verify all platform-specific procedures against current documentation, and prepare for the live 800-150 exam. That approach preserves the useful technical foundation without confusing historical certification structure with today's Cisco program.

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