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evelinad / aws-certification.md
Created June 23, 2019 23:05 — forked from miglen/aws-certification.md
AWS Certification guide and notes on how to prepare for the aws associate certification architect, sysops and developer exams


AWS Certification notes

Those are my personal notes on AWS Solution Architect certification preparation. Hope you find them usefull.

To pass AWS certification, you should have:

  • Sound knowledge about most of the AWS services ( EC2, VPC, RDS, Cloudfront, S3, Route53 etc,)
  • Hands on experience with AWS services.
@evelinad
evelinad / README.md
Created June 23, 2019 20:23 — forked from leonardofed/README.md
A curated list of AWS resources to prepare for the AWS Certifications


A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.


@evelinad
evelinad / latency.markdown
Created July 27, 2017 14:38 — forked from hellerbarde/latency.markdown
Latency numbers every programmer should know

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

@evelinad
evelinad / System Design.md
Created June 17, 2017 05:45 — forked from vasanthk/System Design.md
System Design Cheatsheet

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

  1. Clarify and agree on the scope of the system
  • User cases (description of sequences of events that, taken together, lead to a system doing something useful)
    • Who is going to use it?
    • How are they going to use it?
@evelinad
evelinad / The Technical Interview Cheat Sheet.md
Created June 15, 2017 00:57 — forked from tsiege/The Technical Interview Cheat Sheet.md
This is my technical interview cheat sheet. Feel free to fork it or do whatever you want with it. PLEASE let me know if there are any errors or if anything crucial is missing. I will add more links soon.

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

  • Stores data elements based on an sequential, most commonly 0 based, index.
  • Based on tuples from set theory.
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <sys/socket.h>
#include <sys/types.h>
$~ sudo scapy
>>> from datetime import datetime
>>> pkt = IP(dst="www.google.com", ttl=1) / ICMP()
>>> ans,unans = sr(pkt*3)
Begin emission:
.**Finished to send 3 packets.
*
Received 4 packets, got 3 answers, remaining 0 packets
>>> sent = datetime.fromtimestamp(ans[0][0].sent_time)