1.8 - Cloud networking concepts

Network+ N10-009 objective 1.8 covers cloud networking concepts. Service models scale management: SaaS delivers ready-to-use applications over the web, while IaaS and PaaS give more control. A virtual private cloud (VPC) is an isolated virtual network inside a public cloud where you place and secure your resources. Deployment models vary: a hybrid cloud mixes on-premises resources with public cloud services, alongside public, private and community clouds. Network function virtualization (NFV) replaces hardware appliances like firewalls and load balancers with software network functions running on standard servers. You should also know cloud gateways, connectivity options, elasticity, scalability and multitenancy. Expect scenario questions that describe how a cloud is delivered, isolated, deployed or virtualised and ask which concept - SaaS, VPC, hybrid cloud or NFV - the situation matches.

Memory hook
Ready app over the web = SaaS. Isolated virtual network in a public cloud = VPC. On-prem + public cloud = hybrid. Software instead of hardware appliances = NFV.

Practice questions

1. Which cloud service model delivers ready-to-use applications over the web?

  • IaaS
  • PaaS
  • NaaS
  • SaaS (correct answer)

SaaS delivers complete applications the provider fully manages (e.g., webmail). IaaS gives raw VMs/storage, PaaS gives a development platform, NaaS gives networking.

2. Which cloud connectivity option gives an isolated virtual network in a public cloud?

  • NFV
  • SD-WAN
  • CDN
  • VPC (correct answer)

A VPC (Virtual Private Cloud) is a logically isolated network segment inside a public cloud. NFV virtualizes network functions, SD-WAN manages WAN links, a CDN caches content.

3. Which cloud deployment mixes on-premises resources with public cloud services?

  • Public cloud
  • Private cloud
  • Hybrid cloud (correct answer)
  • Community cloud

A hybrid cloud combines private/on-prem and public cloud with orchestration between them. Public is fully provider-hosted; private is dedicated to one org.

4. Which cloud concept replaces hardware appliances with software network functions?

  • VPC
  • CDN
  • NFV (correct answer)
  • SDN

NFV (Network Function Virtualization) runs firewalls, routers and load balancers as software on commodity servers. A VPC is an isolated cloud network; a CDN caches content.

5. Which cloud model gives you virtual machines and storage that you manage yourself?

  • IaaS (correct answer)
  • PaaS
  • SaaS
  • FaaS

IaaS gives raw compute, storage and networking you configure and patch. PaaS abstracts the OS for developers; SaaS is a finished app; FaaS runs functions.

6. Which technology centrally manages branch WAN links using policy and transport-agnostic overlays?

  • MPLS
  • DOCSIS
  • SD-WAN (correct answer)
  • VRRP

SD-WAN builds policy-driven overlays across any transport (MPLS, broadband, LTE), steering apps dynamically from a central controller. MPLS is a single transport.

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