Networking
Cisco 200-301: Standard vs Extended ACLs
IPv4 access control lists are simple in syntax but powerful in effect: they make ordered permit-or-deny decisions on packets before…
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236 published articles in this category.
Networking
Cisco 200-301: Static Routes and Administrative Distance
Static routing gives the administrator direct control over where a router sends traffic for a destination prefix. That simplicity makes…
Networking
Cisco 200-301: Switch Port Security and Layer 2 Protection
Layer 2 access ports sit at the edge of the network where user devices, phones, printers, access points, and unmanaged…
Networking
Cisco 200-301: VLANs, Trunks, and Native VLAN Behavior
VLANs divide a switched network into separate Layer 2 broadcast domains, while trunks let several VLANs share one physical link…
Networking
Cisco 200-301: Wireless LAN Architecture
Enterprise Wi-Fi is not simply Ethernet without cables. A wireless LAN combines radio-frequency behavior, access points, controllers or cloud control,…
Networking
Cisco 200-901: Ansible for Network Configuration
Ansible gives network engineers a way to describe configuration tasks as repeatable automation rather than retyping command sequences on each…
Networking
AWS ANS-C01: IPv6 Architecture in VPCs
IPv6 in Amazon VPC is not simply “more addresses.” It changes how workloads are numbered, how internet egress is controlled,…
Networking
AWS ANS-C01: Transit Gateway Routing at Scale
AWS Transit Gateway simplifies multi-VPC and hybrid connectivity by replacing many point-to-point links with a hub, but the routing model…
Networking
Cisco 200-301: DHCP Relay and IP Helper Addresses
DHCP works naturally when the client and server share a broadcast domain, but enterprise networks rarely place a DHCP server…
Networking
Cisco 200-301: DNS, NTP, and Syslog
DNS, NTP, and syslog are easy to treat as background services because none of them forwards user traffic. In practice,…
Networking
Cisco 200-301: EtherChannel with LACP and PAgP
EtherChannel combines multiple physical Ethernet links into one logical port-channel so switches can increase bandwidth and preserve redundancy without allowing…
Networking
Cisco 200-301: First Hop Redundancy with HSRP
A default gateway is a single logical address in a host configuration, but enterprise networks should not make that gateway…
Networking
Cisco 200-301: IPv4 Subnetting Without Guesswork
IPv4 subnetting becomes difficult when it is treated as a collection of shortcuts instead of a repeatable calculation. Every subnet…
Networking
Cisco 200-301: IPv6 Addressing and Neighbor Discovery
IPv6 changes more than the length of an IP address. It changes how hosts discover routers, resolve neighboring Layer 2…
Networking
Cisco 200-301: Inter-VLAN Routing with Layer 3 Switches
VLANs create separate Layer 2 broadcast domains, which is useful for segmentation but also means hosts in different VLANs cannot…