Troubleshooting Basics For DevOps Engineers

Name: Troubleshooting Basics For DevOps Engineers
Rating: 4.5 (36 reviews)

Network Engineers and DevOps - Learn Web Stack Fundamentals for Troubleshooting and Automation, HTTP, APIs, WebTransport

Created byShaun Hummel

Last updated 6/2026

English

What you'll learn

Learn web stack fundamentals for troubleshooting
Learn HTTP request/response model
Develop the knowledge needed to transition into DevOps Engineer and SRE roles
WebTransport: The Future of Web Communications
Introduction to REST API architecture for automation
Learn how DNS and TLS Protocols Work
Single-tier vs Multi-tier architecture

Course content

7 sections • 58 lectures • 5h 2m total length

Single-Tier vs Multi-Tier Applications5:28
How a Browser Connects to the Internet7:19
HTTP Request/Response Model4:50
Explore http fundamentals at the application layer, including request–response, tcp stack, get/post/put/delete, caching and authentication, and how a full stack app communicates via http and https.
HTTP GET Request3:27
HTTP Server Response1:34
Full Stack Application Flow3:26
How REST APIs Work4:27
REST API Tokens & Keys6:14
Browser Caching6:25
Data Center Load Balancers8:51
Reverse Proxy Server Operation6:30
Web Page Load Events3:43
Explore how a page load moves GET requests and HTTP responses through TCP send and receive buffers, encapsulation into Ethernet, IP, and TCP headers, and final rendering in the browser.
TCP Socket Buffers3:23
Troubleshooting HTTP7:27
WebTransport6:15

Introduction to DNS5:16
How DNS Lookup Works3:41
Trace the DNS lookup path from client caches to the DNS resolver, then root and TLD servers to the authoritative server, resolving A records and TTL.
Nslookup Command4:45
DNS Troubleshooting Workflow5:48
Troubleshooting Lab3:39
Linux Dig Command9:56
Explore how the linux dig command enables in-depth dns troubleshooting by querying a records, ipv6, cname records, mx records, and ns records, and tracing resolution from root to authoritative servers.

Introduction to TLS4:15
Learn how TLS secures web traffic by enabling in-transit encryption, server authentication with CA-signed certificates, and data integrity checks, with emphasis on TLS 1.2 and 1.3 in HTTPS.
TLS Handshake4:05
Learn how DNS, the TCP handshake, and TLS negotiate a secure tunnel, enabling server authentication with CA certificates and the exchange of a symmetric session key and cipher agreement.
SSL Certificate Validation6:43
Explore TLS and certificate troubleshooting using the Quarles's SSL server test to verify certificate validity, expiry dates, issuer, OCSP status, and protocol support from 1.2 to 1.3.
OCSP Certificate Revocation2:33
Explore the online certificate status protocol (ocsp) and how web servers query the ocsp server, cache revocation status, and use ssl stapling to reduce tls handshake latency.
HTTP Strict Transport Security (HSTS)3:06
SSL Troubleshooting Workflow6:48
SMTP Email Encryption2:18
Explore how smtp operates as a mail transfer protocol, including ports 25, 587, and 2525, and how tls and starttls secure submissions between servers and clients.
Secure File Transfer Protocol (SFTP)1:54

Requirements

Basic networking knowledge is required

Description

Network Engineers, DevOps, and Developers

This introductory course explains the fundamentals of web application architecture. Learn how the HTTP request/response cycle works, API authentication, SSL, and DNS operation.

The topics in this course are prerequisite for Network Engineers and DevOps to learn application troubleshooting and automation.

Learn how full stack applications send data between servers, and REST API architecture components enable client/server communications.

It is essential that you know how DNS resolution works on the internet and SSL/TLS encrypts in-transit data across the internet. HTTP optimization techniques such as preconnect and prefetch are also covered for faster application response time. WebTransport is the newest real-time protocol that leverages all the performance advantages of HTTP/3 for real-time applications.

How a Browser Connects to the Internet
Single-Tier vs Multi-Tier Architecture
HTTP Request/Response Model
Full Stack Application Architecture
HTTP GET Request
HTTP Response Codes
TCP/IP Model For DevOps
DNS Lookup Explained
DNS Record Types
How REST API Works
REST API Keys and Tokens
Secure File Transfer Protocol
Browser Caching Methods
WebTransport API
Automated Diagnostics Tool

You will learn how REST APIs communicate between servers. By the end of this course you will understand HTTP protocol operation, caching techniques, and web authentication for application security.

Instructor Experience

25+ years of enterprise experience with Fortune 100 companies
Networking, performance engineering, and global data centers
Cisco training expert with 80,000+ students worldwide

Who this course is for:

Network Engineers
DevOps Engineers
Cloud Engineers
CCNA & CCNP

Troubleshooting Basics For DevOps Engineers

What you'll learn

Explore related topics

Course content

Web Architecture15 lectures • 1hr 19min

DNS Operation6 lectures • 33min

Data Encryption8 lectures • 32min

Troubleshooting Your Network7 lectures • 1hr 8min

HTTP Performance Basics11 lectures • 55min

Latency, Packet Loss & Throughput9 lectures • 36min

Automated Diagnostics2 lectures • 1min

Requirements

Description

Who this course is for: