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,…
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Browse practical guides, technical explanations and certification coverage.
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…
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…
Cloud Computing
AWS SAA-C03: Lambda Concurrency and Resilient Serverless Design
AWS Lambda can scale rapidly without server management, but “serverless” does not mean capacity planning disappears. Concurrency, function duration, retry…
Networking
AWS SAA-C03: NAT Gateway vs NAT Instance
NAT remains a common part of AWS IPv4 architectures because private workloads often need outbound access to software repositories, partner…
Networking
AWS SAA-C03: Public vs Private Subnets
Public and private subnets are among the first concepts people learn in Amazon VPC, yet the labels are frequently misunderstood.…
Cloud Computing
AWS SAA-C03: RDS Multi-AZ vs Read Replicas
RDS Multi-AZ and read replicas are often mentioned together because both involve additional database copies, but their primary purposes are…
Cloud Computing
AWS SAA-C03: Route 53 Routing Policies and Failover
Amazon Route 53 is often introduced as managed DNS, but architecture decisions begin after the zone exists. The important question…