DevOps – Networking Interview Questions

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Networking is an essential skill for DevOps and while setting up a Lab network we need to work with Routers, Switch, hubs, doing IP planning, assigning subnets, traffic sepration using VLANs. Here we comes up with a short but most imported question the one should prepare while appearing for DevOps Networking interviews.

  • What is Ethernet?
  • What is TCP/IP?
  • What is a MAC address? What is it used for?
  • When is this MAC address used?: ff:ff:ff:ff:ff:ff
  • What is an IP address?
  • Explain subnet mask and given an example
  • What is a private IP address? In which scenarios/system designs, one should use it?
  • What is a public IP address? In which scenarios/system designs, one should use it?
  • Explain the OSI model. What layers there are? What each layer is responsible for?
  • For each of the following determine to which OSI layer it belongs:
    • Error correction
    • Packets routing
    • Cables and electrical signals
    • MAC address
  • IP address
    Terminate connections
    3 way handshake
    Details
    What delivery schemes are you familiar with?
  • What is CSMA/CD? Is it used in modern ethernet networks?
  • Describe the following network devices and the difference between them:
    • router
    • switch
    • hub
  • How does a router works?
  • What is NAT?
  • What is a proxy? How does it works? What do we need it for?
  • What is TCP? How does it works? What is the 3 way handshake?
  • What is round-trip delay or round-trip time?
  • How does SSL handshake work?
  • What is the difference between TCP and UDP?
  • What TCP/IP protocols are you familiar with?
  • Explain “default gateway”
  • What is ARP? How does it works?
  • What is TTL? What does it helps to prevent?
  • What is DHCP? How does it works?
  • What is SSL tunneling? How does it works?
  • What is a socket? Where can you see the list of sockets in your system?
  • What is IPv6? Why should we consider using it if we have IPv4?
  • What is VLAN?
  • What is MTU?
  • What happens if you send a packet that is bigger than the MTU?
  • True or False?. Ping is using UDP because it doesn’t care about reliable connection
  • What is SDN?
  • What is ICMP? What is it used for?
  • What is NAT? How does it work?
  • Which factors affect network performances
  • What the terms “Data Plane” and “Control Plane” refer?
  • Explain Spanning Tree Protocol (STP)
  • What is link aggregation? Why is it used?
  • What is Asymmetric Routing? How do deal with it?
  • What overlay (tunnel) protocols are you familiar with?
  • What is GRE? How does it works?
  • What is VXLAN? How does it works?
  • What is SNAT?
  • Explain OSPF
  • What is latency?
  • What is bandwidth?
  • What is throughput?
  • When performing a search query, what is more important, latency or throughput? And how to assure that what managing global infrastructure?
  • When uploading a video, what is more important, latency or throughput? And how to assure that?
  • What other considerations (except latency and throughput) are there when forwarding requests?
  • Explain Spine & Leaf
  • What is Network Congestion? What can cause it?
  • What can you tell me about UDP packet format? What about TCP packet format? How is it different?
  • What is the exponential backoff algorithm? Where is it used?
  • Using Hamming code, what would be the code word for the following data word 100111010001101?
  • Give examples of protocols found in the application layer
  • Give examples of protocols found in the network Layer
  • What is HSTS?
  • What is the difference if any between SSL and TLS?
  • What is the Internet? Is it the same as the World Wide Web?
  • What is the ISP?

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