How would you troubleshoot an intermittent IPSec VPN tunnel failure between a client site and a data center?I would first establish the scope and timing from monitoring, logs, and affected users, then validate reachability, tunnel status, IKE/IPSec security associations, phase 1 and phase 2 proposals, routing, NAT exemptions, and firewall policies on both peers. I would compare the failure window with circuit events, configuration changes, certificate or key expiration, and packet loss. After implementing a controlled fix, I would test failover and document the root cause, remediation, and monitoring improvements.
Describe your approach to designing a resilient network for a new client office.I begin with business requirements, user and application profiles, security obligations, growth expectations, carrier availability, and recovery objectives. I produce a logical and physical design covering segmentation, IP addressing, redundant switching and internet paths, firewall placement, VPN or SD-WAN connectivity, routing, QoS, wireless requirements, and monitoring. I then validate the design through peer review, implementation planning, rollback procedures, acceptance testing, and complete as-built documentation.
What factors guide your choice between OSPF, EIGRP, and BGP?I select the protocol based on network scale, administrative boundaries, interoperability, policy requirements, and operational supportability. OSPF is well suited to standards-based internal routing with clear area design, while EIGRP can be effective in Cisco-centric environments where its operational model is supported. I use BGP for multihoming, WAN or internet edge policy control, route filtering, and interactions across autonomous systems, with careful prefix, path, and convergence controls.
How do you prioritize several urgent client incidents while also delivering project work?I assess impact, affected services, security risk, contractual commitments, and available workarounds to establish priority. I communicate ownership, expected update times, and realistic next steps to stakeholders, while delegating or escalating where appropriate. I protect planned project time through clear scheduling, but reprioritize transparently when a critical production incident requires immediate attention.
How have you used network monitoring tools such as SolarWinds Orion or syslog platforms to improve operations?I use monitoring to establish baselines and actionable alerts for availability, interface errors, bandwidth, latency, VPN status, device health, and configuration events. I tune thresholds to reduce noise, correlate alerts with syslog and change records, and create dashboards for service visibility. Following incidents, I use the data to identify recurring issues, improve capacity planning, and implement preventative changes.
