Network

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

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?

What is SDN?

What is ICMP? What is it used for?

What is NAT? How does it works?

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?

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.