Cisco CCNA (200-301)Network FundamentalsMedium
A DevOps team wants to deploy multiple lightweight, isolated application instances on a single Linux server with minimal overhead and fast startup times, sharing the host's OS kernel. Which virtualization technology BEST fits this requirement?
- AContainers that share the host operating system kernel
- BA dedicated bare-metal server for each application instance
- CType 1 hypervisor running multiple full guest operating systems
- DType 2 hypervisor installed on top of a desktop OS
Show answer & explanationAnswer & explanation
Correct answer: A. Containers that share the host operating system kernel
Containers virtualize at the OS level, sharing the host kernel while isolating application processes, libraries, and dependencies. This makes them far lighter and faster to start than full virtual machines, which each require their own complete guest OS.
Why the other options are wrong
- B. Dedicated bare-metal servers per app is the opposite of efficient, consolidated deployment.
- C. Type 1 hypervisors run full guest OS instances, which is heavier than needed here.
- D. Type 2 hypervisors also run full guest OSes and add host OS overhead.
Containers vs Virtual Machines
Containers share the host OS kernel and isolate only the application layer, making them lighter and faster than VMs, which each run a full guest OS.
- Containers start in seconds; VMs take longer to boot a full OS
- Containers have smaller resource footprint
- Docker is a common container platform
Memory trick: VMs pack a whole house; containers just pack a suitcase.