DevOps – Networking Interview Questions
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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