Exam Name: Implementing and Maintaining Cisco Technologies Using IOS XR
Certification Provider: Cisco
Corresponding Certification: Cisco Specialist
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Updated: Oct 23, 2026
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Cisco 644-906 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing and Maintaining Cisco Technologies Using IOS XR |
| Exam Number: | 644-906 |
| Exam Format: | Simulation-based questions (historical/legacy exam format), Multiple choice |
| Available Languages: | English |
| Related Certifications: | CCIE Service Provider |
| Recommended Training: | Cisco Learning Network |
| Exam Registration: | Cisco Certification Registration |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Historical Cisco certification exam delivery (typically proctored testing center or online proctoring depending on program period) |
| Pre Condition: | Recommended: strong knowledge of Cisco networking fundamentals and service provider routing technologies |
| Official Syllabus URL: | https://www.cisco.com/ |
Cisco 644-906 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| IOS XR System Architecture | - Process separation and high availability design - Platform architecture and operating model |
| MPLS and Service Provider Technologies | - Traffic engineering concepts - L3VPN and L2VPN services - MPLS forwarding and label distribution |
| Layer 2 Technologies | - VLANs and trunking - Ethernet switching concepts in IOS XR |
| 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 |
| Layer 3 Routing | - IS-IS implementation - BGP design and policy control - OSPF configuration and optimization |
| Quality of Service (QoS) | - QoS classification and marking - Queuing and congestion management |
What Candidates Ask About the Cisco 644-906 Exam
The Cisco Implementing and Maintaining Cisco Technologies Using IOS XR blueprint spans 7 domains — including Automation and Programmability (Foundational), Layer 2 Technologies, IOS XR System Architecture. Spend your hours where the percentages are; the full outline above lists every subtopic.
Yes:
After any official course, verify retention with the 77 practice questions for the Cisco Implementing and Maintaining Cisco Technologies Using IOS XR — scored simulation shows what lectures can't.
Through the vendor's official channels:
The Cisco Implementing and Maintaining Cisco Technologies Using IOS XR is delivered Historical Cisco certification exam delivery (typically proctored testing center or online proctoring depending on program period) — choose the option that fits your schedule.
Recommended: strong knowledge of Cisco networking fundamentals and service provider routing technologies Vendors adjust eligibility rules over time — verify the current requirements on the official page (official 644-906 exam page) before registering.
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Yes — download the free Cisco Implementing and Maintaining Cisco Technologies Using IOS XR demo and inspect real questions before paying. Your purchase then stays valid for 365 days with free updates throughout, renewable afterward at 50% off.
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, at the Expert level. It validates practical, job-relevant skills — which is why employers shortlist certified candidates. Related credentials include CCIE Service Provider.
Cisco Implementing and Maintaining Cisco Technologies Using IOS XR Sample Questions:
Which three types of packet drop statistics can be determined by using the following Cisco IOS XR CLI show command? (Choose three.)
RP/0/RSP1/CPU0:ASR9006-A#show cef ipv4 drops location all
- A. RPF drops
- B. Cisco Express Forwarding exception drops
- C. asymmetric routing drops
- D. ACL drops
- E. no adjacency drops
- F. no route drops
Correct Answer: A,E,F 🗳️
Which command will correctly deactivate asr9k-mpls-p-4.1.0?
- A. RP/0/RSP0/CPU0:P1 (admin)#install remove disk0:asr9k-mpls-p-4.1.0
- B. RP/0/RSP0/CPU0:P1 #asr9k-mpls-p-4.1.0 disk0:deactivate sync
- C. RP/0/RSP0/CPU0:P1 (admin-config)#deactivate disk0:asr9k-mpls-p-4.1.0
- D. RP/0/RSP0/CPU0:P1 (admin)#install deactivate disk0:asr9k-mpls-p-4.1.0
- E. RP/0/RSP0/CPU0:P1 (config)#install deactivate smu location disk0:
Correct Answer: D 🗳️
Which four list the mandatory steps in order to implement SSH v1 access on Cisco IOS XR Software? (Choose four.)
- A. configure TACACS server on the router
- B. configure hostname and domain name
- C. configure ssh-server in owner SDR
- D. install and activate security PIE
- E. reload system after installing required PIE
- F. install and activate services PIE
- G. generate SSH cryptography key
- H. configure AAA services on the router
Correct Answer: B,C,D,G 🗳️
Which of the following QoS criteria cannot be configured on a policy map that is applied in the ingress direction on a Cisco CRS-1 interface in Cisco IOS XR Software?
- A. random-detect
- B. bandwidth
- C. shape average
- D. set qos-group
- E. priority
- F. police
Correct Answer: B 🗳️
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