Google

Topics

Stream	Topics	% Done
Networking	OSI layers	100%
	TCP, IP, UDP, ICMP, ARP, DHCP, NAT, FTP	100%
	HTTP, SSL	100%
	Caching, Cookies, Certificates	Caching, Cookies,
	DNS	Done
	SMTP
	Latency, Tail Latency
	BGP, OSPF	Done
	Load Balancing
Linux	Shell scripting
	Kernel, libraries, system calls	Done
	Memory Management
	Permissions, file systems	Done
	Linux Commands Brushup	Done
Programming	Python Brushup
	Algorithms
	HTML, CSS
	Databases, SQL, Indexing
Google	Technical Quesitions
	Behavioral Questions
	Leadership Questions
Designing	Medium sized Campus Design
Cheatsheet		Done

Preparations

• 1st round
• 1st Week Dec starting

• Video interview

coding
tech 
communication
thinking

• 1 Hour:

1st Troubleshooting code
Distributes system
Web & Network technologies

• F2F - Bangalore office

2 tech Networking/General Web troubleshooting
1 manager

• Share use cases
• Working with Code (15 min)
• What is code, Issue & How to improve it.

• Ask question about question
• Break it down

• No IDE
• No library

Topics 2

• Semaphores
• Mutex
• Threads

Questions

• What are alternative solutions of Spanning tree?

Port Isolation
Vlan Isolation
Loopback Detection

• Tail Latency

200ms latency -> initial rto by most OSs
Do not consider normal Retransmissions, but only RTOs
exponential backoff rto will double with each iteration -> 400ms, 800ms, 1000ms
congestion, pathmtu not honored, icmp rate-limited, reply pathmtud-reply packets dropped,
os issues -> Zero window -> cpu high(response slow), memory high, disk issue

• 4k video file edit latency

RTP uses tcp, n/w level issues, check latency on which side traces,

Networking Followup

1) Moving of files BW APAC & EMEA

1MBPS speed? whats wrong  (Fragmentation, WSF, )
multiple streams
Pearing
Latency
Congestion
BW/Delay product BDP
TCP Window size
Packet capture

2) SSH to remote server

GCP VM
Timed out

3) System Design

Past system design you have done
Trade off you made in this
Scaling this specific network
3-tier network design in public cloud. How do you diesgn
Will you need LB? Why?

4) How can you establish secure connectivity to public cloud

VPN tunnel?
How do you ensure High Availabiltiy for this?

5) Re-Evaluate the design?

Room for improvement?