Keep Networking Simple!

Keep networking simple by exploring the osi model through a cyber security lens, using Ada's kitchen and a postal system analogy, and master subnetting, VLANs, routing, dhcp, and packet tracer.

Explore ipv4 subnetting and vlan concepts through bingo analogy to visualize network segmentation. Learn how subnet masks and network and broadcast addresses guide router, switch, and firewall configurations for security.

Master variable length subnet masking (VLSM) to flexibly allocate subnets with different sizes, using CIDR and tailored subnet masks to maximize usable hosts and minimize waste.

Build a multi-floor network design by subnetting and routing to segment the kitchen, delivery, sales, and accounting areas, then allocate IP addresses using CIDR blocks and router interfaces.

Explore static routing and dynamic routing with dhcp, using a two-router network to demonstrate show ip route, connected vs local routes, and subnetting concepts.

Explore dynamic routing with neighbor and topology tables, metrics, and multiple paths across three routers to choose the best route in a growing network, using a basic EGP configuration.

Discover how dynamic host configuration protocol dhcp on a router automatically assigns IP addresses via dhcp pools for multiple subnets, compare static versus dhcp and review security implications.

Explore a growing small home office network, from a single router and cable modem on a 192.168.0.x network to wired switches and wireless access as the business expands.

Design a single-floor strip mall network with 13 kitchen and delivery PCs and 8 sales/accounting PCs, using a Cisco 4321 router and two Cisco 2960 switches, and CIDR 27 subnets.

Expand a multi-building network with a warehouse, three routers, and five switches, then implement dynamic routing with GRP, DHCP, SSH, 802.1Q VLANs, port security, and a firewall.

Manually configure both router interfaces with IP addresses and a /25 subnet, enable the interfaces, and verify connectivity between PCs with ping in packet tracer.

Configure a simple home office network with a wireless router, a wired PC, and a wireless printer using DHCP, wifi SSID, WPA2, and verify connectivity with a ping.

In this office network, we expand from a setup by adding switches for more PCs and configuring DHCP to start at 100, with 2-99 for static addresses and wireless connectivity.

Switch from static to dynamic host configuration protocol DHCP by configuring DHCP pools on the first floor router, creating two pools for delivery and kitchen, and assigning IP addresses automatically.

Implement port security on a layer-two switch to bind ports to specific Mac addresses, using static and dynamic (sticky) Mac learning, with violation modes like shutdown, restrict, and protect.

Build a multi-floor network by adding a second-floor sales and accounting subnet, installing a serial link between routers, configuring interfaces and IP addresses, and establishing static routes verified by ping.

Learn to secure a router with SSH by generating a 1024-bit RSA key, enabling SSH v2, and configuring a domain, username, and password for encrypted logins from a client.

Configure a Cisco ASA on a 5506 firewall by setting up inside and outside interfaces, assigning IP addresses with a /30, and enabling routing adjacency with the ISP via EGP.

Configure a standard ACL in Packet Tracer to deny the sales PC (192.168.10.130) on interface gigabit 0/0/1, then verify by ping tests showing blocked traffic.

Configure an extended acl named no_ping to deny icmp to the 192.168.10.0/25 subnet. Apply inbound to gigabit interface 0/0 and verify by ping tests showing blocked access.