Cisco IOS

Todd Lammle’s CCNA IOS Commands Survival Guide by Todd Lammle

Cisco IOS Cookbook by Kevin Dooley

Cisco IOS in a Nutshell by James Boney

Cisco IOS Cookbook by Ian Brown

Cisco IOS XR Fundamentals by Mobeen Tahir

CISCO IOS QUICK REFERENCE | CHEAT SHEET by Douglas Chick

IP Routing on Cisco IOS, IOS XE, and IOS XR: An Essential Guide to Understanding by Brad Edgeworth and Aaron Foss

Cisco Networks: Engineers’ Handbook of Routing, Switching, and Security with IOS by Chris Carthern and William Wilson

Cisco IOS Quick Reference Guide by Shaun Hummel

Cisco IOS Show Commands Desk Reference by Shaun Hummel