Cisco 644-906 Actual Free Exam Questions & Community Discussion

Exam Code/Number: 644-906
Exam Name/Title: Implementing and Maintaining Cisco Technologies Using IOS XR
Certification Provider: Cisco
Corresponding Certification: Cisco Specialist

Exam Questions: 77
Updated On: May 26, 2026

Question #33

What are the two minimum tasks and configurations that are required for the forwarding of multicast traffic using Source-Specific Multicast? (Choose two.)

A. configuring PIM on interfaces

B. configuring multicast-routing on interfaces

C. installing multicast PIE on the router

D. installing services PIE on the router

Discussion 0

Correct Answer: B,C Vote an answer

Question #34

In order to determine the hardware and firmware revision of a linecard, what is the correct command that should be invoked?

A. RP/0/RP0/CPU0:CRS-MC#show platform

B. RP/0/RP0/CPU0:CRS-MC#show version

C. RP/0/RP0/CPU0:CRS-MC(admin)#show diag details

D. RP/0/RP0/CPU0:CRS-MC(admin)#show platform

E. RP/0/RP0/CPU0:CRS-MC#show diagnostic summary

Discussion 0

Correct Answer: C Vote an answer

Question #35

Which statement is false?

A. A Cisco IOS XR device can be directly connected to an atomic clock and provide a stratum 1 service.

B. UTC is a global time scale that is distributed by atomic clocks over the Internet, over specialist long-wave radio transmissions, or with the Global Positioning System (GPS) network.

C. The NTP stratum describes how many hops away that a system is from an authoritative time source.

D. A Cisco IOS XR device can be configured as a stratum 1 master clock source.

Discussion 0

Correct Answer: A Vote an answer

Question #36

Referring to the diagram and configuration on Routers XR-1 and XR-2,

which three statements are correct? (Choose three.)

A. Router XR-1 can form a neighbor adjacency over interface GigabitEthernet0/0/0/2 but will not advertise 10.1.1.0/24 in its link-state packets (LSPs).

B. The received IS-IS packets from Router XR-2 will be suppressed from being processed.

C. Router XR-1 and Router XR-2 will form a neighbor adjacency, and Router XR-2 will become the designated router or designated intermediate system.

D. The transmission of IS-IS packets will be suppressed on interface GigabitEthernet0/0/0/2 on Router XR-1.

E. Router XR-1 will use the incremental shortest path first algorithm when there are minimal topology changes.

F. Router XR-1 can never be a designated router or designated intermediate system.

Discussion 0

Correct Answer: A,C,E Vote an answer

Question #37

Which component is shared between different SDRs?

A. switch fabric card (SFC)

B. line card

C. modular service card (MSC)

D. distributed route processor (DRP)

E. route processor (RP)

Discussion 0

Correct Answer: A Vote an answer

Question #38

Which command will show the IP address of a Cisco Discovery Protocol neighbor?

A. show cdp neighbors

B. show cdp entry

C. show cdp

D. show cdp interface

Discussion 0

Correct Answer: B Vote an answer

Question #39

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#ip default-network 0.0.0.0 10.52.204.161 255.255.255.255

B. RP/0/RSP0/CPU0:R15(config)#router static 0.0.0.0/32 10.52.204.161

C. RP/0/RSP0/CPU0:R15(config-static-afi)#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-static)#ip route 0.0.0.0 0.0.0.0 10.52.204.161

Discussion 0

Correct Answer: C Vote an answer

Question #40

Which user privilege level is needed to create a nonowner SDR?

A. root-system

B. netadmin

C. root-lr

D. Cisco-support

E. sysadmin

Discussion 0

Correct Answer: A Vote an answer

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