Evelina Dumitrescu evelinad
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.
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.
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
Picking the right architecture = Picking the right battles + Managing trade-offs
- 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?
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.
###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) |