100-490 RSTECH study guide
100-490 RSTECH · Work through your exam, one topic at a time.
The 100-490 RSTECH exam, titled Supporting Cisco Routing and Switching Network Devices, is a Cisco exam listed on Cisco's official exams page. It targets IT support staff, field technicians, and partner or reseller engineers who install, configure, maintain, and troubleshoot Cisco routing and switching equipment in customer environments rather than design architectures from scratch. The published domain outline weights four areas equally at 25 percent each: routing and switching fundamentals, Cisco device configuration and management, network troubleshooting and maintenance, and network security and services. That balance means you cannot pass on configuration memorization alone; expect device-level commands, verification output, fault isolation, and basic security hygiene to matter equally. The 100-490 RSTECH study guide has 4 sections and about 1,743 words.
01Routing and Switching Fundamentals
Routing and Switching Fundamentals tests whether you can explain how a frame or packet actually reaches its destination. At RSTECH level this means OSI and TCP/IP layer mapping, Ethernet MAC addressing, switch forwarding behavior, VLANs and 802.1Q trunks, IPv4 addressing and subnet masks, ARP, and the boundary between switching and routing.
452 words, about 2 min02Cisco Device Configuration and Management
Cisco Device Configuration and Management tests practical Cisco IOS CLI skills: moving between command modes, setting device identity and passwords, enabling remote management, configuring interfaces and gateways, saving configuration, and verifying results with show commands. User EXEC ( ) permits basic monitoring.
433 words, about 2 min03Network Troubleshooting and Maintenance
Network Troubleshooting and Maintenance tests structured fault isolation and routine upkeep. Expect questions on interface error counters, speed and duplex mismatch, spanning-tree loops, connectivity tools, neighbor discovery, configuration backup, and recovery procedures.
421 words, about 2 min04Network Security and Services
Network Security and Services tests device hardening, Layer 2 access controls, basic ACLs, and the supporting services that keep a network manageable. RSTECH-level questions focus on port security, secure management, DHCP, DNS, NAT, NTP, syslog, and SNMP, with an emphasis on correct configuration and verification.
437 words, about 2 min