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: Jul 19, 2026

Question #9

Which four list the mandatory steps in order to implement SSH v1 access on Cisco IOS XR Software? (Choose four.)

A. configure hostname and domain name

B. configure TACACS server on the router

C. configure ssh-server in owner SDR

D. configure AAA services on the router

E. generate SSH cryptography key

F. install and activate services PIE

G. reload system after installing required PIE

H. install and activate security PIE

Discussion 0

Correct Answer: A,C,E,H Vote an answer

Question #10

In which mode can you check the power usage of a chassis?

A. in admin mode

B. in environmental mode

C. in both EXEC and admin mode

D. in EXEC mode

E. in ROMMON mode

Discussion 0

Correct Answer: A Vote an answer

Question #11

What is the correct Cisco IOS XR CLI command to assign a cost of 20 to interface TenGigE 0/1/0/1 for Area 0?

A. config mode, interface tengige 0/1/0/1, ip ospf cost 20

B. config mode, router ospf 1, area 0, interface tengige 0/1/0/1, cost 20

C. config mode, router ospf 1, area 0, interface tengige 0/1/0/1, auto-cost 20

D. config mode, router ospf 1, interface tengige 0/1/0/1, ip ospf cost 20

Discussion 0

Correct Answer: B Vote an answer

Question #12

What is the size of the packets that traverse the Cisco CRS-3 switch fabric?

A. 64 bytes

B. 1500 bytes

C. variable packets that are dependent on packets being sent through the client interfaces

D. not applicable, as the Cisco CRS-3 uses a fixed cell in the switch fabric

Discussion 0

Correct Answer: D Vote an answer

Question #13

Which Cisco IOS XR command is the most useful for checking if traffic is being sent for a specific multicast group?

A. show multicast stats

B. show mrib route 226.1.1.1

C. show ip mroute traffic 226.1.1.1

D. show mfib route 226.1.1.1

Discussion 0

Correct Answer: D Vote an answer

Question #14

Which command configures IPv4 uRPF strict mode on an interface?

A. ipv4 verify unicast source reachable-via rx

B. ipv4 verify unicast destination reachable-via rx

C. ipv4 verify unicast source reachable-via any

D. ipv4 verify unicast source reachable-via tx

E. ipv4 verify multicast source reachable-via tx

Discussion 0

Correct Answer: A Vote an answer

Question #15

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

A. show configuration ospf

B. show ospf configuration | running-config

C. show ospf process

D. show run router ospf

E. show router ospf

Discussion 0

Correct Answer: D Vote an answer

Question #16

Which of the following functions can be configured in the Administration Config mode? (Choose two)

A. MPLS Traffic Engineering

B. Secure Shell login

C. SDR hostname

D. nonowner SDR

E. BGP routing

Discussion 0

Correct Answer: C,D Vote an answer

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