Networking
Remote Access vs Site-to-Site VPN Explained
Two offices in different cities need to act like one network, and a worker at home needs to…
Category
Networking
How To
Configure Cisco Dynamic ARP Inspection (DAI)
ARP has no way to verify that a reply is honest. A host asks “who has 192.168.10.1?” and…
How To
Configure Cisco DHCP Snooping to Block Rogue Servers
When a PC boots, it trusts the first DHCP server that answers. It cannot tell the company’s real…
How To
Cisco Port Security: Configure Sticky MACs and Violations
A switch port with nothing plugged into it is still a live network jack. Anyone who can reach…
How To
Configure Cisco Access Control Lists (ACLs)
Configure and verify Cisco ACLs: standard, extended, and named access control lists, wildcard masks, placement, and show access-lists…
How To
AAA Explained: RADIUS vs TACACS+ on Cisco
AAA explained and compared: authentication, authorization, accounting, and RADIUS vs TACACS+ ports, transport, and encryption, with Cisco AAA…
How To
Configure Cisco Device Access Control with Local Passwords
Configure and verify Cisco device access control with local passwords: enable secret, console and VTY lines, login local,…
Networking
Network Security Concepts: Threats, Exploits, and Defenses
The network security concepts the CCNA tests: threats vs vulnerabilities vs exploits, the CIA triad, defense in depth,…
Networking
CCNA 200-301 Domain 3 Practice Test: IP Connectivity
Free CCNA 200-301 Domain 3 (IP Connectivity) practice test: 30 random questions per retake from a 91-question lab-validated…
Networking
Troubleshoot IP Connectivity on Cisco Routers
PC1 cannot reach PC2. The ping times out, and a whole subnet of users is stuck on the…
Networking
First Hop Redundancy Protocol Explained: HSRP, VRRP, and GLBP
Every device on a subnet sends off-network traffic to a single default gateway. That one address is also…
How To
Configure Inter-VLAN Routing with a Layer 3 Switch (SVI)
Router-on-a-stick gets inter-VLAN routing working, but it routes in software and squeezes every packet between VLANs through one…