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

  • Exam Code: 644-906
  • Exam Name: Implementing and Maintaining Cisco Technologies Using IOS XR
  • Updated: Oct 06, 2026
  • Q & A: 77 Questions and Answers

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Cisco 644-906 Exam Syllabus Topics:

SectionObjectives
System Operations and Troubleshooting- Troubleshooting routing and forwarding issues
- Monitoring IOS XR systems
Automation and Programmability (Foundational)- Basic IOS XR automation concepts
- Model-driven telemetry overview
MPLS and Service Provider Technologies- Traffic engineering concepts
- MPLS forwarding and label distribution
- L3VPN and L2VPN services
Quality of Service (QoS)- QoS classification and marking
- Queuing and congestion management
Layer 3 Routing- BGP design and policy control
- IS-IS implementation
- OSPF configuration and optimization
Layer 2 Technologies- VLANs and trunking
- Ethernet switching concepts in IOS XR
IOS XR System Architecture- Platform architecture and operating model
- Process separation and high availability design

Thinking About the 644-906 Exam? Read This First

The official Cisco Implementing and Maintaining Cisco Technologies Using IOS XR blueprint is split into 7 domains, starting with System Operations and Troubleshooting, MPLS and Service Provider Technologies, Automation and Programmability (Foundational). The percentages tell you where the exam concentrates its questions, so budget your study time accordingly — the complete outline above lists every domain and subtopic.

The Cisco Implementing and Maintaining Cisco Technologies Using IOS XR is Cisco's official exam for the Cisco Certified Internetwork Expert (CCIE) Service Provider (legacy track) certification, positioned at the Expert level. It is the credential hiring managers scan for, and passing it proves your skills meet the vendor's own standard. It also links to related certifications like CCIE Service Provider, so this exam can serve as a building block in a longer certification plan.

Registration goes through the vendor's official channels:

Worth knowing before you book: the 644-906 exam is delivered Historical Cisco certification exam delivery (typically proctored testing center or online proctoring depending on program period), so pick the delivery option that works best for you.

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Recommended: strong knowledge of Cisco networking fundamentals and service provider routing technologies Vendor requirements do change from time to time, so confirm the current criteria before scheduling — the official 644-906 exam page has the final word.

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Cisco Implementing and Maintaining Cisco Technologies Using IOS XR Sample Questions:

Question #1

Which of the following configurations adds a community to routes that are matched on AS criteria?

  • A. route-policy policy1 if as-path in set1 then set community (356:1000) additive endif end-policy
  • B. route-policy policy1 if community in set1 then set community (356:1000) additive endif end-policy
  • C. route-policy policy1 if as-path neighbor-is set1 then set community (356:1000) additive endif end-policy
  • D. route-policy policy1 if as-path in set1 then set community (356:1000) endif end-policy
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Question #2

Which command in Cisco IOS XR Software is the recommended way to configure an IPv4 address on an interface?

  • A. ip address 10.0.0.1 255.0.0.0
  • B. ip address 10.0.0.1/8
  • C. ip addr add 10.0.0.1/8 dev Gig 0/0/0/0
  • D. ipv4 address 10.0.0.1/8
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #3

What is the cell size of the cells that traverse the switch fabric on the Cisco CRS-3?

  • A. 128 bytes
  • B. 288 bytes
  • C. 136 bytes
  • D. 200 bytes
  • E. 144 bytes
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Question #4

A network administrator needs to configure a default IPv4 route for a Cisco CRS-1 router. Which Cisco IOS XR command will accomplish this task?

  • A. RP/0/RSP0/CPU0:R15(config-static-afi)#0.0.0.0/0 10.52.204.161
  • B. RP/0/RSP0/CPU0:R15#ip default-network 0.0.0.0 10.52.204.161 255.255.255.255
  • C. RP/0/RSP0/CPU0:R15(config-static)#ip route 0.0.0.0 0.0.0.0 10.52.204.161
  • D. it is not possible to configure static routes in Cisco IOS XR Software
  • E. RP/0/RSP0/CPU0:R15(config)#router static 0.0.0.0/32 10.52.204.161
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Question #5

Which command should be used to view only the running configuration of OSPF in Cisco IOS XR Software?

  • A. show ospf configuration | running-config
  • B. show configuration ospf
  • C. show run router ospf
  • D. show ospf process
  • E. show router ospf
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

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