Linux Network Troubleshooting Commands (CCNA/DevOps)

Name: Linux Network Troubleshooting Commands (CCNA/DevOps)
Rating: 4.5 (80 reviews)

Learn how to troubleshoot Linux-based network connectivity and servers. Linux commands cheat sheet included.

Created byShaun Hummel

Last updated 4/2026

English

English [Auto],

What you'll learn

Learn how to troubleshoot Linux-based network devices and servers
Learn networking commands to analyze configuration and operational state
Learn how to edit configuration files easily with Nano editor
Learn how to analyze system performance and network packets

Course content

2 sections • 17 lectures • 1h 17m total length

System Information4:41
Explore linux system information commands like whoami, cat /etc/os-release, uname -a, last reboot, and free -g to verify os details, kernel version, uptime, and memory.
Linux Commands Cheat Sheet0:01
Security Rights (ls)5:16
Learn how the ls command shows Linux security rights, owner, group, and others, with rwx and numeric codes such as 755. Apply cd, mkdir, and rmdir to manage directories.
Change Directory (cd)2:30
Learn how to use the cd command to navigate Linux directories, explore etc and network directories, view interfaces with ls -l, and paginate output with more.
Display Files (cat)3:53
Learn to use the Linux cat command to view, create, edit, and delete key files such as /etc/hostname, /etc/hosts, and /etc/network/interfaces, and configure DNS, IP addresses, and time zone.
Nano Configuration Editor4:56
Grep Command2:00
Discover how to use the grep command to search a text file for a pattern, highlight matches in syslog, and use tail to view the last ten entries for troubleshooting.

TCP/IP Model8:40
Explore the tcp/ip model as the de facto standard, superseding the osi model, detailing its five layers, hardware versus software division, and essential protocols for troubleshooting and applications.
Interface Status5:14
Explore interface status checks with Linux ip link commands to verify layer one and two connectivity, view the MTU, MAC and broadcast addresses, and monitor interface statistics.
Data Link Connection3:00
Use the IP neighbor command to test the layer two link between host and switch, verify ARP entries with ARP -a, and confirm ARP is working after pinging the server.
Server IP Addressing2:41
Explore the ip address command to view loopback, ethernet interfaces, mac addresses, IPv4 and IPv6 addresses. Learn how to inspect an interface and edit the interfaces file for IP changes.
Open Port Testing4:45
Test open ports at the transport layer with telnet to verify http port 80 and ftp port 21. Use ss, the replacement for netstat, to inspect tcp sessions and pids.
DNS Operation4:45
Use nslookup to query DNS servers, verify the ISP DNS resolver, and distinguish cache (non-authoritative) from authoritative responses. Explore A, MX, and NS records, IPv4/IPv6 addresses, and TTL effects.
Troubleshooting Lab9:49
Learn to troubleshoot networks with mTOR, a combined ping and traceroute tool, and analyze network path metrics such as propagation delay, latency, packet loss, and queuing to identify issues.
Linux Commands Quiz
Firewall Operation15:19
Master firewall operation across stateful and stateless architectures, Cisco ACLs, DMZ topologies, and application layer and web application firewall capabilities to protect enterprise and cloud traffic.
Systems Troubleshooting Guide (CCNA/DevOps)0:04

Requirements

Some basic networking knowledge is required

Description

This course is an introduction to network troubleshooting Linux-based devices and servers. Learn how to verify server interface settings, routing, and DNS. You will also learn how to configure network interfaces. Troubleshoot TCP/UDP connection with open port testing and socket statistics command.

It is common to have network servers and devices deployed to the data center. They are all based on some Linux derived version. Currently 90% of the top 1 million internet servers are Linux-based. Ansible and Terraform referred to as Infrastructure as Code (IaC) are often deployed to Linux servers. In this course you will learn Linux system and file management navigation commands.

Learn how to troubleshoot Linux-based network devices and servers to the network layer.
Learn important networking commands to analyze configuration and operational state.
Learn how to edit networking and system configuration files easily with Nano editor.
Learn how to analyze system performance and network traffic with Linux commands.

There are also networking commands for troubleshooting up to Layer 3 with Debian v.12 host and Ubuntu v.20 server. There are network management applications deployed to servers in the cloud and on-premise data centers for Syslog, SNMP, DHCP, DNS, NTP, and RADIUS.

System Commands

System Information
Security Rights
Change Directory
Display File Contents
Nano Configuration Editor
Grep File Search

Networking Commands

TCP/IP Model
Interface Status
Data Link Connection
Server IP Addressing
DNS hostname testing
Server Open Port Testing
Firewall Operation
Linux Commands Cheat Sheet

CISCONET Training Solutions is a certification training provider with thousands of students worldwide. Training expert with 25+ years of experience, CCNA author, and Cisco spotlight awards. The integrated learning system includes online courses, lab training, study tools, and practice tests.

CCST • CCNA • CCNP • IT/Networking

Who this course is for:

DevOps
Network Engineers
Cloud Engineers

Linux Network Troubleshooting Commands (CCNA/DevOps)

What you'll learn

Explore related topics

Course content

Introduction7 lectures • 23min

Networking Commands10 lectures • 54min

Requirements

Description

Who this course is for: