Juniper Networks Staff Engineer Interview Questions, Process, and Tips

Round duration - 45 minutes
Round difficulty - Easy

Technical Interview round with questions on DSA

Q1. 
Level Order Traversal of Binary Tree
Given a Binary Tree of integers, your task is to return the level order traversal of the tree.
Input:
The first line contains an integer 'T' which denotes the number...read more
Ans. 
A queue can be used to do level order traversal of the tree. For each node, first visit the node and then push its children nodes in the FIFO queue. 
printLevelorder(tree)
1) Create an empty queue q
2) temp_node = root /*start from root*/
3) Loop while temp_node is not NULL
a) print temp_node->data.
b) Enqueue temp_node’s children 
(first left then right children) to q
c) Dequeue a node from q.
Time Complexity: O(n...read more
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Q2. 
Swap Adjacent Bit Pairs Problem Statement
Given an integer N, your task is to compute the number that results from swapping each even position bit of N's binary representation with its adjacent odd bit to...read more
Ans. 
1. Let oddPositionBits and evenPositionBits be the two variables that store the value of bits at odd positions and even positions respectively.
2. Set oddPositionBits as the Bitwise AND of N and 0x55555555.
3. Set evenPositionBits as the Bitwise AND of N and 0xAAAAAAAA.
4. Left shift oddPositionBits by 1 bit and right shift evenPositionBits by 1 bit. In this step, we are swapping the positions of the odd bits and the even bits.
5. Let an...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions on Networking.

Q1. What are the various components of an IP packet header?
Ans. 
Following are various components/fields of IP packet header
Version: The first IP header field is a 4-bit version indicator. In IPv4, the value of its four bits is set to 0100, which indicates 4 in binary. 
Internet Header Length: Internet header length, shortly known as IHL, is 4 bits in size. It is also called HELEN (Header Length). This IP component is used to show how many 32-bit words are present in the header.
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Q2. What is the difference between TCP and UDP?
Ans. 
TCP reads data as streams of bytes, and the message is transmitted to segment boundaries. UDP messages contain packets that were sent one by one. It also checks for integrity at the arrival time.
TCP messages make their way across the internet from one computer to another. UDP is not connection-based, so one program can send lots of packets to another.
TCP rearranges data packets in the specific order. UDP protocol has n...read more
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Q3. What are the various components of a TCP segment header?
Ans. 
Source port : 16 Bit number which identifies the Source Port number (Sending Computer's TCP Port).

Destination port : 16 Bit number which identifies the Destination Port number (Receiving Port).

Sequence number : 32 Bit number used for byte level numbering of TCP segments. If you are using TCP, each byte of data is assigned a sequence number. If SYN flag is set (during the initial three way handshake connection initiatio...read more
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