Exam Name: Implementing and Maintaining Cisco Technologies Using IOS XR
Certification Provider: Cisco
Corresponding Certification: Cisco Specialist
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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 |
| Related Certifications: | CCIE Service Provider |
| Exam Format: | Multiple choice, Simulation-based questions (historical/legacy exam format) |
| Available Languages: | English |
| Recommended Training: | Cisco Learning Network |
| Exam Registration: | Cisco Certification Registration |
| Sample Questions: | Cisco 644-906 Sample Questions |
| 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 |
|---|---|
| Topic 1: System Operations and Troubleshooting | - Troubleshooting routing and forwarding issues - Monitoring IOS XR systems |
| Topic 2: IOS XR System Architecture | - Platform architecture and operating model - Process separation and high availability design |
| Topic 3: MPLS and Service Provider Technologies | - MPLS forwarding and label distribution - Traffic engineering concepts - L3VPN and L2VPN services |
| Topic 4: Quality of Service (QoS) | - Queuing and congestion management - QoS classification and marking |
| Topic 5: Automation and Programmability (Foundational) | - Model-driven telemetry overview - Basic IOS XR automation concepts |
| Topic 6: Layer 3 Routing | - BGP design and policy control - IS-IS implementation - OSPF configuration and optimization |
| Topic 7: Layer 2 Technologies | - Ethernet switching concepts in IOS XR - VLANs and trunking |
Cisco 644-906 Exam — Your Questions, Answered
The 644-906 exam, officially titled Implementing and Maintaining Cisco Technologies Using IOS XR, is the Cisco exam you pass to earn the Cisco Certified Internetwork Expert (CCIE) Service Provider (legacy track) certification, a credential at the Expert level. Passing it confirms the skills defined in the official exam outline, and it is associated with related credentials such as CCIE Service Provider.
Cisco lists the following prerequisites or eligibility notes for the 644-906 exam: Recommended: strong knowledge of Cisco networking fundamentals and service provider routing technologies. Requirements can change over time, so confirm the details on the official exam page at Cisco's official site before you register.
You can register for the 644-906 exam through the official channels below:
The exam is delivered in the following format: Historical Cisco certification exam delivery (typically proctored testing center or online proctoring depending on program period). Choose a date that leaves you enough time to work through the full 77-question practice set first.
Cisco recommends the following training resources for 644-906 candidates:
Official courses build the theory, and the 77 practice questions from Fast2test help you turn that theory into exam-ready speed and accuracy.
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The 644-906 exam blueprint is divided into 7 domains, starting with IOS XR System Architecture; Layer 2 Technologies; Quality of Service (QoS). For the complete domain-by-domain breakdown, see the Exam Topics section above — it lists every topic the current outline covers.
Cisco Implementing and Maintaining Cisco Technologies Using IOS XR Sample Questions:
On a Cisco CRS, which statement is correct about what happens to the MSC if the associated PLIM is absent?
- A. The state of the MSC from the output of the command show platform would show as IOS XR RUN.
- B. The other PLIM in a different slot can utilize this MSC.
- C. The MSC boots up, but all egress packets from the switch fabric to this MSC will be dropped.
- D. The MSC does not boot up.
Correct Answer: D 🗳️
When running MPLS Traffic Engineering with Cisco IOS XR Software, which three criteria can be seen when the show mpls traffic-eng tunnels command is executed on a midpoint router? (Choose three.)
- A. TE metric
- B. incoming and outgoing label
- C. tunnel ID
- D. physical bandwidth
- E. tunnel role
Correct Answer: B,C,E 🗳️
In Cisco IOS XR platforms, IP multicast packets are replicated on which two components? (Choose two.)
- A. egress line card
- B. switch fabric
- C. multicast forwarding ASIC
- D. ingress line card
Correct Answer: A,B 🗳️
Which Cisco IOS XR command is the most useful for checking if traffic is being sent for a specific multicast group?
- A. show ip mroute traffic 226.1.1.1
- B. show multicast stats
- C. show mrib route 226.1.1.1
- D. show mfib route 226.1.1.1
Correct Answer: D 🗳️
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(config-static)#ip route 0.0.0.0 0.0.0.0 10.52.204.161
- C. RP/0/RSP0/CPU0:R15#ip default-network 0.0.0.0 10.52.204.161 255.255.255.255
- D. RP/0/RSP0/CPU0:R15(config)#router static 0.0.0.0/32 10.52.204.161
- E. it is not possible to configure static routes in Cisco IOS XR Software
Correct Answer: A 🗳️
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