June 2023

Question 1

Requirements for publishing a Github package (4)

Answer 1

1) npm publish (the command)
2) .npmrc (file with credentials)
3) {GITHUB_PACKAGES_TOKEN} in .env
4) valid “create packages” user token from Github

Question 2

SCP (AWS Context)

Answer 2

Service Control Policies (only inside AWS Organizations, there are other perm-management control elsewhere)

Question 3

HAProxy

Answer 3

High Availability Load Balancer

Question 4

Protocols supported by the Application Load Balancer (AWS)

Answer 4

HTTP, HTTPS, WebSocket

Question 5

Protocols supported by the Network Load Balancer (AWS)

Answer 5

TCP, TLS (secureTCP), UDP

Question 6

PCAP

Answer 6

Packet Capture
an API for capturing network traffic

Question 7

Autoware definition.
What is it built upon?
Important modules (5)

Answer 7

Autoware is an open-source software project for autonomous driving.
built on Robot Operating System (ROS)
Set of modules:
sensing
perception
planning
decision
actuation

Question 8

MMC

Answer 8

Michigan Mobility Collaboration (Detroit Project)

Question 9

Markov Chain

Answer 9

A stochastic model describing a sequence of possible events in which the probability of each event depends only on the state attained in the previous event.

Question 10

SAE Specs as a group

Answer 10

J2735 - V2x message set (SPaT, MAP, BSM) used by DSRC & CV2X
J3016 - Levels
J3018 guidelines for testing Automated Vehicles
J3224 - SDSM (Sensor Data Sharing Message)

Question 11

Common ROS objects (4)

Answer 11

topic
node
interface
parameter

Question 12

Common Ros Commands (7)

Answer 12

list
info
echo
hz
bw
pub
play/record

Question 13

Dave Leblanc

Answer 13

Acting Head of the Vehicle Systems & Control Group at UMTRI

Question 14

Adding new company to allow registration (in Keys)

Answer 14

Need to set the membership field & the authorized domain.

Question 15

Amazon Organizations (4 main concepts)

Answer 15

OU - Organizational Unit
Root OU
infinitely nest-able OUs
SCP applied to each OU

Question 16

AWS IAM Advanced Policies (6)

Answer 16

aws:SourceIp
aws:RequestedRegion
ec2:ResourceTag/Project
aws:PrincipalTag/Department
aws:MultiFactorAuthPresent
aws:PrincipalOrdID

Question 17

AWS IAM Advanced Policy Gotcha with S3 actions

Answer 17

Targeting buckets bucket-name-path
Targeting objects bucket-name-path/*

Question 18

What is HDF5 (5 “things”)

Answer 18

Hierarchical Data Format
HDF5 is the latest version
B-tree indexing
resources are accessed via POSIX style syntax /path/to/resource
faster than a RDB

Question 19

Raster Image

Answer 19

An image in the 2D format that you are used to. x and y pixel coords… Yup, that simple.

Question 20

AWS Route53 Health checks (3 kinds)

Answer 20

Health Checks
Calculated Health Checks (aggregate of health checks)
Cloudwatch Health Checks

Question 21

AWS Fargate

Answer 21

Serverless way to host AWS ECS workloads. No management of servers or clusters.

Question 22

AWS AMI

Answer 22

Amazon Machine Image

Question 23

AWS EBS

Answer 23

Amazon Elastic Block Store

Question 24

AWS ACM

Answer 24

Amazon Certificate Management

Question 25

AWS ALB

Answer 25

Application Load Balancer

Question 26

AWS NLB

Answer 26

Network Load Balancer

Question 27

AWS CLB

Answer 27

Classic Load Balancer

Question 28

AWS Draining

Answer 28

Concept of when an EC2 instance is going down. It must first serve all pending requests.

Question 29

AWS ASG (& kinds offered (2))

Answer 29

Amazon Auto Scaling Groups
Scale-in
Scale-Out

Question 30

AWS Dynamic Scaling Policies (4)

Answer 30

Target Tracking Scaling
Simple/Step Scaling
Scheduled Actions
Predictive Scaling (ML based)

Question 31

AWS Good Typical metrics to use to drive Scaling (4)

Answer 31

CPU utilization
Request Count Per Target
Avg. Network In/Out
Custom Cloud Watch

Question 32

AWS Scaling Cooldown (and default)

Answer 32

Default is 300 s (5 mins). Cool off after a scaling event, so you don’t get cascading scaling. (don’t be too fast)

Question 33

AWS Load Balancing: How to keep repeat calls form one location on the same instance

Answer 33

Turn on sticky connections.

Question 34

Amazon CloudTrail?

Answer 34

Auditing Tool
Trail as in audit trail.
Tracks users actions in AWS: management console, CLI, SDKs, and APIs

Question 35

How do you delete a terminated EC2 instance?

Answer 35

Just wait. It will go away eventually.

Question 36

Delete old branch (Git, 3 steps, first in English, then Git commands)

Answer 36

Checkout main
push delete command to remote/origin
fetch prune

git checkout main
git push origin –delete branch
git fetch -p

Question 37

Best way to pull in changes from main (if you are the only one using the branch)

Answer 37

git checkout branch
git rebase main

deal with conflicts

Question 38

Merge a branch into main

Answer 38

git checkout main
git merge branch

Question 39

Difference between git revert & git reset

Answer 39

git reset just pushes the HEAD pointer to the requested spot. This is OK to do when working in your private branch.
git revert just undoes a particular changeset and creates a new change to track those undo changes. This is the preferred method.

Question 40

How to update requirements.txt (and when to do it)

Answer 40

pip freeze > requirements.txt
usually after running a pip install (and testing it of course)

Question 41

How to open a file in the VSCode editer

Answer 41

code <filename></filename>

Question 42

ASGI

Answer 42

Asynchronous Server Gateway Interface
A spiritual successor to WSGI
Intended to provide a standard interface among async-capable Python web servers, frameworks and apps