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…
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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: 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: 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: 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: 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: 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
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…
Cybersecurity
AWS ANS-C01: Network Firewall and Centralized Inspection
AWS Network Firewall can protect one VPC directly or become part of a centralized inspection architecture that filters traffic across…