Juniper Networks Software Engineer IV Interview Questions, Process, and Tips

Q1. Difference between Process and Threads
Ans. 
Processes are independent instances of a program, while threads are smaller units within a process sharing resources.
• Processes have their own memory space, while threads share the same memory space within a process.

• Processes are heavyweight, while threads are lightweight.

• Processes communicate with each other through inter-process communication mechanisms, while threads can communicate directly.

• Example: A web browser ru...read more
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Q2. Explain DNS protocol
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DNS protocol is used to translate domain names to IP addresses on the internet.
• DNS stands for Domain Name System

• It translates human-readable domain names (like www.google.com) to IP addresses (like 172.217.3.206)

• DNS operates on a client-server model, with DNS servers hosting DNS records for different domains

• DNS queries are sent by clients to DNS servers to resolve domain names to IP addresses
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This round had a bit of both, technical and coding related questions.. Technical questions were from basic embedded related questions, as well as, networking protocol and layer questions.

Last round was purely coding round with multiple coding questions which includes bitwise operators and linked list questions mainly.

Q1. 1.Linux device driver flow 2.Device tree concept 3.Explain spi driver flow and how to consume from user space 4.Link list insert 5.Bit wise questions
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Q1. C question and codes. Link list, string pattern match. Sorting algorithm.
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Q1. 1.Detail questions on Linux memory management, isr , exceptions. 2.Linux kernel locks like spin , mutex , read write . 3.Question on platform bus 4.Tasklet , soft Irq question. 5.Device tree configuration ...read more
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Q1. Basic linux kernel question, focused on booting, from boot rom code . Simple c coding
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Q1. Discussion with manager. Ask about my project details and questions from same . Explained about job responsibilities and projects.
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Q1. Why Juniper? Salary expectations
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Q1. About the module we work and on the hardware. Mostly this is initial filtering round
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Coding with c or c++

Q1. Deep discussion on module we work and hardware pipeline , packet flow , protocols
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Q1. Managerial round The team in which we gonna work . Manager from that team is contacting us on providing background of work and area we gonna work
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Q1. Reason for switching Company background
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Q1. How tcp/ip works and explain about tcp header
Ans. 
TCP/IP is a protocol used for communication between devices on a network. TCP header contains information about the data being transmitted.
• TCP/IP is a suite of protocols used for communication between devices on a network

• TCP is a connection-oriented protocol that ensures reliable delivery of data

• IP is a connectionless protocol that handles the routing of data packets

• TCP header contains information such as source and de...read more
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Q2. How vlan works and explain about vlan header
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VLAN is a logical network created by grouping devices together based on their functions or departments.
• VLAN stands for Virtual Local Area Network

• It allows multiple networks to coexist on the same physical network

• VLANs are created by assigning a group of devices to a specific VLAN ID

• VLAN header contains a 4-byte tag that identifies the VLAN ID

• VLAN header is added to the Ethernet frame before transmission
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