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 #17

HOTSPOT

Discussion 0

Correct Answer:

Question #18

How would you configure IS-IS process TEST to support MPLS Traffic Engineering extensions on level 1 and 2 that are intending to run a tunnel across TenGigE 0/0/0/0?

A. mpls ldp traffic-eng level-1-2 mpls traffic-eng router-id 1.1.1.1
router isis TEST interface Ten 0/0/0/0 address-family ipv4 unicast

B. mpls ldp router isis TEST interface Ten 0/0/0/0 address-family ipv4 unicast mpls traffic-eng level-1-2 mpls traffic-eng router-id 1.1.1.1

C. router isis TEST net 49.0001.0001.0001.0001.00 address-family ipv4 uni metric-style wide interface Ten 0/0/0/0
address-family ipv4 unicast mpls traffic-eng router-id 1.1.1.1 mpls traffic-eng level-1-2

D. router isis TEST net 49.0001.0001.0001.0001.00 address-family ipv4 unicast metric-style wide mpls traffic-eng router-id 1.1.1.1 mpls traffic-eng level-1-2
interface Ten 0/0/0/0 address-family ipv4 unicast

Discussion 0

Correct Answer: D Vote an answer

Question #19

Which three configuration steps are mandatory in order to enable NetFlow sampling on Cisco IOS XR Software? (Choose three.)

A. flow monitor-map

B. flow exporter-map

C. interface netflow configuration

D. importer-map

E. sampler-map

Discussion 0

Correct Answer: A,C,E Vote an answer

Question #20

Refer to the show environmental power-supply command output exhibit.

How many additional line cards of the same type that are currently in the system can you
safely install and remain redundant in the worse power usage if there is a power supply failure?

A. 2

B. 5

C. 4

D. 3

E. 1

Discussion 0

Correct Answer: E Vote an answer

Question #21

Refer to the exhibit.

Examine the configuration for AAA and the vty line.
If the user attempts to connect to the router via an SSH session to the vty, which one is true?

A. The user will be prompted for a username and password and can successfully log in using "user1" and "lab." The user will be a member of the user group root-system.

B. The user will be prompted for a username and password and can successfully log in using "user1" and "lab." The user will be a member of the user group operator.

C. The user will be prompted only for a password and can successfully log in using the password "cisco." The user will not be assigned any tasks.

D. The user will be prompted only for a password and can successfully log in using the password "cisco." The user will be a member of the user group operator.

E. The user will not be able to authenticate with this configuration.

Discussion 0

Correct Answer: A Vote an answer

Question #22

HOTSPOT

Discussion 0

Correct Answer:

Question #23

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

A. 128 bytes

B. 144 bytes

C. 136 bytes

D. 288 bytes

E. 200 bytes

Discussion 0

Correct Answer: C Vote an answer

Question #24

Referring to the configuration output exhibit,

which set of commands below will allow you to insert a new line just before the permit any statement?

A. :router #resequence access-list ipv4 Ethernet_In :router#configure :router(config)#ipv4 access-list Ethernet_In :router(config-ipv4-acl)#25 deny udp any eq tftp any

B. :router#configure :router(config)#ipv4 access-list Ethernet_In :router(config-ipv4-acl)# insert after 2 deny udp any eq tftp any

C. :router#configure :router(config)#ipv4 access-list Ethernet_In :router(config-ipv4-acl)# 2.5 deny udp any eq tftp any

D. :router#configure :router(config)#ipv4 access-list Ethernet_In :router(config-ipv4-acl)#move 3 to 4 :router(config-ipv4-acl)#3 deny udp any eq tftp any

Discussion 0

Correct Answer: A Vote an answer

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