Cisco 644-906 : Implementing and Maintaining Cisco Technologies Using IOS XR

  • Exam Code: 644-906
  • Exam Name: Implementing and Maintaining Cisco Technologies Using IOS XR
  • Updated: Jun 02, 2026
  • Q & A: 77 Questions and Answers

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Understanding functional and technical aspects of Operating System (644-906 SPAUTO)

The following will be asked from you in the CISCO 644-906 exam dumps:

  • Locate core files and moving them to a server
  • Understanding security certificate in PIEs and SMUs
  • Using TFTP, FTP, USB thumb drive, and hard drive as the source
  • Understand what is target config
  • Show configuration history
  • Assigning user privilege to root-system
  • See what install requests are currently active
  • Understand between admin user versus exec username
  • Going back to a previous configuration
  • Understand differences between owner and non-owner SDR in access to admin plane and exec plane
  • Understand what configuration is in the admin plane
  • Remove inactive packages, PIEs, or SMUs
  • Showing configuration IDs and labels
  • Deactivate PIEs or SMUs
  • Activate PIEs or SMUs
  • Check which packages are active
  • Understand what is active config
  • Show where certain processes are running
  • Understanding types of packages (SMUs)
  • Understand what configuration is in the exec plane
  • Using the parser with pipe, include, exclude, begin, regex
  • Understanding types of packages (optional PIEs)
  • Check which packages are committed
  • How to check processes like state, number of restarts, job id, pid, tid
  • Committing the configuration (with labels and comments)
  • Base assumption of EEM knowledge - understand what is possible/not possible
  • Initial or recovery software installation (ROMMON variables)
  • How to use Show LPTS commands
  • How to use Show Tech Support commands
  • Committing the configuration (replacing the configuration)
  • With activate flag
  • Understand IOS-XR versioning and installation restrictions
  • Check how much CPU a process is using
  • How to find a blocked process
  • Using TAR file
  • Initial or recovery software installation (Turboboot Mini.VM file)
  • How to look at the memory utilization on the route processor
  • Committing the configuration (using the commit confirm feature)
  • Show policer values and drop counts in LPTS
  • Understanding how task-based authorization work
  • Committing the configuration (show config fail)
  • Understand when a semantic check is done
  • Understand when a syntax check is done
  • Committing the installation path
  • Understand the default VRF
  • Understand what is LPTS
  • Check how much memory a process is using
  • Understand P versus PX images and the hardware they support
  • How to look at the memory utilization on the line card
  • Understand protected memory space versus shared memory and which area uses it
  • Understand about LPTS policer
  • Assigning user privilege to root-lr
  • Understanding types of packages (Mini.VM)
  • Loading configuration
  • Debug commands with ACL filtering
  • How to perform process restart
  • Configure interfaces before the physical interface is available)
  • Check installation log
  • Assigning user privilege to cisco-support
  • Using source flag
  • Understanding types of packages (Mini.PIE)
  • Committing the configuration (atomic versus best effort)
  • Core file configuration location including hard drive and FTP

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Who Should Take The Exam

People who have experience with Cisco routers.

Reference: http://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/specialist-imtxr.html

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