how many questions of 640-875 practice test?

Q1. Refer to the exhibit. 

Given the Class C IP network of 192.168.1.0, using VLSM, which five subnets meet the requirements in the exhibit? (Choose five.) 

A. 192.168.1.0/27 

B. 192.168.1.32/27 

C. 192.168.1.48/27 

D. 192.168.1.48/28 

E. 192.168.1.64/28 

F. 192.168.1.80/28 

G. 192.168.1.80/29 

H. 192.168.1.88/30 

I. 192.168.1.96/30 

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Q2. Which two statements about transparent bridging operations are true? (Choose two.) 

A. A bridge builds its MAC address table dynamically using the spanning-tree protocol. 

B. A bridge operates at the data link layer. 

C. A bridge sends unknown unicast frames out on all ports except the incoming port. 

D. A bridge forwards traffic based on the destination IP address. 

E. All the ports on the bridge belong to the same collision domain. 

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Q3. Given the CIDR address range of 200.165.160.0 to 200.165.191.255, what is the CIDR block? 

A. 200.165.160.0/17 

B. 200.165.160.0/18 

C. 200.165.160.0/19 

D. 200.165.160.0/20 

E. 200.165.160.0/21 

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Q4. Which three statements about the Cisco IOS XR task-based user authorization method are true? (Choose three.) 

A. A user's association with a particular user group links that user to a particular set of task IDs. A user that is associated with a task ID can execute any operation associated with that task ID. 

B. Users can be assigned only to one user group. 

C. Every user group is associated with one or more task groups. 

D. Every task group is defined by a set of task IDs. 

E. Each user is assigned a privilege level. 

F. Each IOS XR CLI command is assigned a privilege level. 

G. A task ID maps the IOS XR command to a privilege level. 

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Q5. With a distance vector routing protocol like RIPv1, when is a route in the routing table placed in the "possibly down" state? 

A. when a router receives an update from its neighbor router about a network in its routing table but with a worse metric 

B. when a router receives an update from its neighbor router about a network in its routing table but with a better metric 

C. when a router receives an update from its neighbor router indicating that a previously accessible network is now inaccessible 

D. whenever the router receives an update from its neighbor about a newly learned network 

E. whenever the router interface that is used to reach the remote network goes down 

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Q6. Refer to the exhibit. 

Using a single Class C network of 192.168.1.0/24 and VLSM, which two options specify the number of subnets that are needed to support this network and what are the minimum sizes of the required subnets? (Choose two.) 

A. 4 subnets 

B. 6 subnets 

C. 8 subnets 

D. 26 subnets 

E. 28 subnets 

F. two /30 subnets + one /28 subnets + one /29 subnets 

G. four /30 subnets + two /28 subnets 

H. six /30 subnets + two /28 subnets 

I. twenty six /30 subnets 

J. twenty eight /30 subnets 

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Q7. Which two statements about Packet over SONET are true? (Choose two.) 

A. POS is a Layer 2 technology that uses PPP in ATM encapsulation and SONET framing. 

B. The Layer 2 frame is encapsulated into a generic HDLC header (not Cisco proprietary HDLC) and placed into the appropriate SONET Payload Envelope. 

C. The FCS field can be set to 16 bits on one end and 32 bits on the other end of a POS connection without causing any connectivity issues. 

D. The Cisco POS interface supports Cisco HDLC and PPP encapsulation. 

E. POS can be used in a point-to-point or point-to-multipoint environment. 

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Q8. When EIGRP is enabled on Cisco IOS XR, which EIGRP feature is on by default? 

A. no auto-summary 

B. stub routing 

C. unequal cost paths load-balancing 

D. no ip eigrp split-horizon 

E. eigrp authentication 

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Q9. Which Cisco IOS XR CLI command displays the running state of each line card (including the fan tray) on the Cisco ASR 9000 Series Router? 

A. RP/0/RSP0/CPU0:PE1#show platform 

B. RP/0/RSP0/CPU0:PE1(admin)#show platform 

C. RP/0/RSP0/CPU0:PE1#show hw-module fpd location all 

D. RP/0/RSP0/CPU0:PE1(admin)#show hw-module fpd location all 

E. RP/0/RSP0/CPU0:PE1#show version 

F. RP/0/RSP0/CPU0:PE1(admin)#show version 

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Q10. Which statement about 10/40/100 GigabitEthernet interface configuration on Cisco IOS XR is true? 

A. Use the negotiation auto command in interface configuration mode to enable link auto-negotiation to ensure that devices that share a link segment are automatically configured with the highest performance. 

B. The configuration supports only full-duplex operation. 

C. The range for MTU values is 64 bytes to 1518 bytes on the interface. 

D. The interface has no flow control configuration. 

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