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

Cisco 644-906 exam
  • Exam Code: 644-906
  • Exam Name: Implementing and Maintaining Cisco Technologies Using IOS XR
  • Updated: Sep 16, 2026
  • Q & A: 77 Questions and Answers
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Understanding functional and technical aspects of Control Plane (644-906 SPAUTO)

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

  • Add VPNv4 capability to one iBGP peer
  • Understand the flow of packets through a router
  • Configure Multicast VPN
  • Enable some but not all of the IPv4 enabled interfaces for IPv6 routing
  • Display the IPv4 unicast route table
  • Configuring AAA command authorization - Using TACACS+ and local as fallback
  • Configure MSDP for interconnecting PIM-SM domains
  • Configuring logging buffer
  • Configuring line templates, vty pools
  • Configure PIM-SM, PIM-SSM, PIM-SSM range
  • Display a specific entry and explain AS path and next-hop information
  • Determine the status of the routing adjacencies
  • Verify that communities are added as expected
  • Configure OSPF to support traffic engineering extensions
  • Determine status if interfaces are configured for ISIS
  • Execute show command to verify status of LDP neighbors
  • Configuring AAA authentication - using TACACS+ and local as fallback
  • Securing vty line and vty access
  • Configure router to log neighbor events
  • Enable ISIS for IPv4 unicast routing
  • Create a route policy that checks for an AS from the AS-set and adds a community for matching routes
  • Configure static routes in for IPv4 unicast in two different VRFs
  • Describe the difference in processing of transit packets versus locally destined packets
  • Understand the information stored in a forwarding table entry
  • Configure one iBGP neighbor to exchange both IPv4 and IPv6 prefixes over an IPv4 session
  • Turn and debugging for ISIS adjacencies and explain the information shown
  • Configure Multicast NSF
  • Apply ACLs in debug commands
  • Configure static routes for IPv4 unicast in the global table
  • Understand and monitor interface counters
  • Implement ACLs to filter traffic on an interface
  • Configuring logging facility
  • Add two VRFs into BGP and redistribute static routes into BGP for VPNv4
  • Configure MoFRR
  • Configure eBGP neighbors for IPv4 routing
  • Verify AAA permissions upon command failure (i.e., debug aaa)
  • Use neighbor-groups for identical configuration sections on multiple peers
  • Enable ISIS for IPv6 unicast routing
  • Configuring AAA command accounting
  • Determine status of neighbors
  • Compare to regular show command
  • Configuring terminals for logging display (term mon)
  • Verify vty access-group configuration
  • Configure static-RP, Auto-RP and BSR for PIM-SM
  • Enable LDP on interfaces
  • Display the peer summary status for IPv4 and IPv6
  • Create a route-policy that uses an inline prefix-set and changes the local preference when a match is found
  • Monitor ACL counters
  • Enable RSVP on interfaces
  • Configure iBGP neighbors with the typical configuration to use loopback addresses for peering
  • Modify interface counter load interval
  • Display OSPF database and determine which links are present
  • Modify an existing applied ACL
  • Monitoring logging buffer and filtering messages
  • Configure interfaces for ISIS routing
  • Configure additional interfaces to be part of non-backbone area
  • Configure router to run LDP
  • Configure non-default metric on some interfaces
  • Configure BGP to support IPv6 routing
  • Configure the ISIS NET
  • Configuring local logging device/archiving
  • Configure interfaces to be part of the backbone area
  • Configure one iBGP peer to support 6PE type functionality by adding addressfamily IPv6 labeled-unicast
  • Clear interface counters
  • Troubleshoot packet drops
  • Configure a simple pass_all policy for those eBGP neighbors
  • Configure an autonomous system number for BGP to use
  • Create a route policy that adds a community where the community is used as a parameter when the policy is called
  • Configure neighbor logging so adjacency changes can be monitored
  • Display the IPv4 BGP table
  • Configure one iBGP neighbor as an IPv6-only neighbor with IPv6 peer addresses
  • Determine status of OSPF interfaces
  • Execute a show bgp command using a route-policy to modify the output.
  • Configuring syslog server host as logging destination
  • Configure P2MP-TE for IP Multicast
  • Configure BGP to support IPv4 routing
  • Define an AS-set for use in RPL
  • Implementing TACACS+ - assigning tasks groups and privileges
  • Configuring exec timeout
  • Display the topologies for IPv4 and IPv6. Why are they different?
  • Re-sequence an ACL
  • Determine how much memory the BGP process uses Configure RPL

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How to Prepare For Implementing and Maintaining Cisco Technologies Using IOS XR (IMTXR)

Preparation Guide for Implementing and Maintaining Cisco Technologies Using IOS XR (IMTXR)

Introduction

This exam tests a candidate's knowledge of implementing, verification testing, and maintaining Cisco core and edge technologies, using the IOS XR based router platforms, which include the CRS, ASR 9000, and the XR12000 routers. The Implementing and Maintaining Cisco Technologies using IOS XR (IMTXR) (646-906) exam is the exam associated with the IOS XR Specialist certification. A 90-minute exam with 65‒75 questions, the exam tests a candidate's knowledge of implementing, verification testing, and maintaining Cisco core and edge technologies, using the IOS XR based router platforms, which include the CRS, ASR 9000, and the XR12000 routers. CISCO 644-906 practice exams and CISCO 644-906 practice test will help to understand and memorize the concepts and detailed answers and solutions.

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

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

  • Show power usage
  • Difference between admin versus exec plane for show platform
  • Difference between admin versus exec plane for show platform
  • Identify CRS switch fabric
  • Identify components of CRS fabric
  • Identify PLIM
  • Upgrade FPD and ROMMON Upgrade
  • Show cards via show diagrams
  • Showing current FPD version information
  • Identify ASR9000 chassis
  • Identify cable management
  • Recommend PDU as a function of facility
  • Understand FPD versus ROMMON
  • Configure Auto FPD
  • Describe CRS air-flow
  • Clear environmental alarm
  • Differentiate between single and multi-chassis
  • Identify ASR9000 line cards
  • Show inventory of the system
  • Identify management interface
  • Show card status via show platform
  • Monitor system power level
  • Use proper grounding for installation
  • Identify RP CRS/ASR9000
  • Verify system-detected environment is within tolerance levels
  • Show fan status
  • Describe ASR9000 air-flow
  • Identify ASR9000 PDU
  • Identify MSC
  • Understanding what is a FPD.PIE
  • Upgrading FPDs and ROMMONs
  • Understand what is Parallel FPD
  • Identify ASR9000 RSP
  • Show power alarm values
  • Identify CRS chassis
  • Gather system environmental output
  • Recommend environmental levels for system installation
  • Install appropriate PDU for chassis
  • Show environmental alarm values
  • Describe ASR9000 fabric
  • Identify CRS SIP/SPA
  • Recommend rack space requirements
  • Identify ASR9000 SIP-700/SPA

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

Cisco 644-906 Exam Syllabus Topics:
SectionObjectives
Topic 1: Multicast- PIM sparse mode configuration
- Multicast routing in service provider networks
Topic 2: Routing Protocols- OSPF configuration and optimization
- IS-IS implementation
- BGP configuration and policy control
Topic 3: MPLS and VPN Services- L3VPN implementation
- Traffic engineering concepts
- MPLS label switching fundamentals
Topic 4: IOS XR Architecture and Platform Fundamentals- Device boot process and file system
- Process management and control/data plane separation
- IOS XR system architecture overview
Topic 5: Quality of Service (QoS)- Congestion management and avoidance
- QoS models and architecture
- Traffic classification and marking
Topic 6: Infrastructure Services- Logging and troubleshooting tools
- System management and monitoring

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