Top 50 packet flow Interview Questions
The most frequently asked packet flow questions across all roles and companies, ranked by real interview frequency. Updated daily.
Explain all seven OSI layers, map protocols and devices to each, and relate the model to packet flow and security controls.
Palo Alto NetworksiiOPEX TechnologiesExplain how Cisco CML traceroute discovers hop paths using TTL expiry, ICMP responses, and simulated router behavior.
Warner Bros. DiscoveryExplain the seven OSI layers, their responsibilities, and the security controls used to protect traffic at each layer.
Phonepe
CohesityExplain how public and private IP addresses differ, including RFC 1918 ranges, routing, NAT, and security implications.
Halma
BarclaysExplain TCP/IP layers, packet flow, reliability, and the security controls applied at each network boundary.
NokiaExplain Linux packet flow, routing, and nftables firewalling from one Ubuntu host to a multi-region network.
CanonicalExplain TCP handshake behavior and isolate connection resets using packet captures, host telemetry, and network-path analysis.
TikTokTests whether the candidate can trace traffic through all OSI layers, explain encapsulation and decapsulation, and map OSI to TCP/IP.
Accenture
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Identify NVIDIA datacenter servers with failed leaf links or denied firewall flows using layered SQL diagnostics.
NVIDIAJoin network inventory tables to report VLAN broadcast domains, subnet coverage, and active devices.
VerkadaIdentify preferred iBGP routes that can be forwarded without an IGP using ranked routes and latest Layer 2 observations.
NVIDIA