1.2 Describe Cisco Network Software Architecture 350-501 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is a key architectural difference between IOS XE and IOS XR?

   • AIOS XE uses a monolithic kernel, while IOS XR uses a Linux kernel.
   • BIOS XE is designed for service provider core routers, while IOS XR is designed for enterprise switches.
   • CIOS XE runs on a Linux kernel with processes in user space, while IOS XR uses a microkernel with processes in separate memory spaces.
   • DIOS XE does not support data plane separation, while IOS XR does.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A service provider is upgrading a legacy aggregation router that currently runs classic Cisco IOS. The router must support MPLS L3VPN, BGP, and multicast while allowing individual processes to be restarted without rebooting the entire device. The team wants to minimize operational disruption during maintenance windows. Which architecture should they choose?

   • ACisco NX-OS
   • BCisco IOS (classic)
   • CCisco IOS XE
   • DCisco IOS XR
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A service provider is deploying a new aggregation router that must support the ability to add new features without a full software upgrade, and must allow individual processes to be restarted without affecting the control plane. The router is a chassis-based platform with dual route processors. Which operating system should be chosen?

   • AIOS XE, because it is Linux-based and supports process restart.
   • BClassic IOS, because it is the most stable for chassis-based platforms.
   • CIOS XR, because it is designed for chassis-based platforms with distributed processing and process restart.
   • DAny of the above, because all support process restart on chassis platforms.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which architectural feature of IOS XE distinguishes it from classic IOS?

   • AIt uses a single monolithic kernel with no user-space processes.
   • BIt runs all control-plane functions in a single process to reduce overhead.
   • CIt eliminates the need for a separate data plane by using software forwarding only.
   • DIt separates control and data planes and runs control-plane processes in separate memory spaces.
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A network engineer is comparing classic IOS and IOS XE for a new deployment. The engineer is concerned about the risk of a software bug in one feature causing a full router crash. Which architectural difference addresses this concern?

   • AIOS XE runs each feature as a separate process, while classic IOS runs all features in a single shared memory space.
   • BClassic IOS uses a microkernel, while IOS XE uses a monolithic kernel.
   • CBoth use the same architecture, so there is no difference.
   • DClassic IOS supports process restart, while IOS XE does not.
   Reveal Solution Discussion Select an answer first