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…
Tag
cisco
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…
How To
Configure Router-on-a-Stick Inter-VLAN Routing on Cisco
Put two computers in different VLANs on the same switch and they cannot reach each other. That is…
How To
Configure Single-Area OSPF on Cisco IOS
Static routes work fine until you have more than a few of them. Single-area OSPF is where most…
How To
OSPF Concepts Explained for CCNA: DR/BDR and LSDB
Every router running OSPF builds an identical map of the network and then works out its own best…
How To
Configure IPv6 Static Routes on Cisco (Link-Local & Floating)
IPv6 static routes look like their IPv4 cousins until you hit the parts that are genuinely different, and…
How To
Configure IPv4 Static Routes on Cisco (Default and Floating)
When the primary link drops, a backup route has to take over, and on a Cisco router that…
How To
How a Cisco Router Forwards a Packet (CEF, FIB, and Adjacency)
A packet arrives on one interface and leaves on another, and everything a router does happens in the…
How To
How to Read the Cisco IP Routing Table (show ip route)
Read the Cisco IP routing table with show ip route: route codes, administrative distance vs metric, longest-prefix match,…
Networking
CCNA 200-301 Domain 2 Practice Test: Network Access
Test your CCNA 200-301 Domain 2 (Network Access) knowledge: VLANs, trunking, CDP/LLDP, spanning tree, EtherChannel, and wireless, with…
Networking
Cisco Wireless Architectures and AP Modes Explained
Understand Cisco wireless architectures and AP modes: autonomous vs controller-based, split-MAC and CAPWAP, FlexConnect, and the lightweight AP…