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2021 Mar 400-201 practice exam

Q21. Refer to the exhibit. 

ABC and XYZ MPLS VPN customers are accruing Internet access. Both CEs are sending traffic to the Internet. Which statement about their connectivity is true? 

A. Both CEs will have connectivity. 

B. Only CE-XYZ will have connectivity. 

C. Neither CEs will have connectivity, as both CEs are using the same NATed subnet. 

D. Only CE-ABC will have connectivity. 

E. Neither CEs will have connectivity, as IAR does not have route back to the NATed subnet. 

Answer: D 


Q22. In an MPLS VPN environment, the QoS marking over the MPLS backbone must be different from the one that is received from the customer. The forwarding on the egress PE is based on the marking that is set by the ingress PE. Which null label and QoS mode can achieve this? 

A. MPLS explicit null with pipe mode 

B. MPLS implicit null with short pipe mode 

C. MPLS implicit null with uniform mode 

D. MPLS explicit null with uniform mode 

E. MPLS explicit null with short pipe mode 

F. MPLS implicit null with pipe mode 

Answer: A 

Explanation: 

http://www.cisco.com/en/US/tech/tk828/technologies_q_and_a_item09186a00800a43f5.sht ml#wp27379 

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_diffserv/configuration/15-mt/mp-te-diffserv-15-mt-book/mp-diffserv-tun-mode.pdf 

https://ccdewiki.wordpress.com/2013/05/31/three-qos-models-in-mpls/ 


Q23. Refer to the exhibit. 

All routers have OSPF adjacency with the directly connected routers, yet RC cannot receive OSPF updates from Area 0 To fix this issue, which configuration should be applied? 

A. On RD router 

router ospf 1 

area 1 virtual-link 3.3.3.3 

On RB router: 

router ospf 1 

area 1 virtual-link 4.4.4.4 

B. On RC router. 

router ospf 1 

area 2 virtual-link 3.3.3.3 

On RB router: 

router ospf 1 

area 2 virtual-link 2.2.2.2 

C. On RC router 

router ospf 1 

area 0 virtual-link 1.1.1.1 

On RA router: 

router ospf 1 

area 2 virtual-link 2.2.2.2 

D. On RD router: 

router ospf 1. 

area 1 virtual-link 1.1.1.1 

On RA router: 

router ospf 1 areal virtual-link 4.4.4.4 

Answer: A 


Q24. A network engineer needs to connect two core switches that use Gigabit Ethernet interfaces in an MPLS backbone and that are separated by a distance of 60 km. Which Cisco GBIC achieves this goal? 

A. Cisco 1000BASE-T GBIC 

B. Cisco 1000BASE-SX GBIC 

C. Cisco 1000BASE-LX/LH GBIC 

D. Cisco 1000BASE-ZX GBIC 

Answer: D 

Explanation: 

http://www.cisco.com/web/partners/downloads/765/tools/quickreference/gbic.pdf 


Q25. Refer to the exhibit. 

PIM sparse mode is implemented in the network RPF succeeds under which condition? 

A. The RPF check succeeds for the next hop whose router ID is the highest. 

B. The RPF check succeeds for the highest DR priority for the PIM router. 

C. The RPF check succeeds for both PIM neighbors, and traffic load-balances across both neighbors. 

D. The RPF check succeeds for the highest interface IP address for the PIM router. 

Answer: D 


Far out 400-201 exam:

Q26. An engineer is tasked with configuring Lawful-Intercept on the Internet facing routers. Which two security issues must the engineer take into consideration? (Choose two) 

A. Default SNMP does not include all the MIB references needed to respond to the request. 

B. A new and dedicated loopback interface is required to communicate with the MD device. 

C. Encryption might be required depending on the request. 

D. The communication between the MD and the Content IAP happens over UDP port 161. 

E. QoS and CoPP should be implemented to protect and optimize the tasks. 

F. SNMFV2c should be enabled in order to provide the correct message format. 

Answer: A,D 


Q27. Two MPLS VPN customers want to acquire Internet access. They make use of overlapping address space but do not want to use NAT on the CPEs. Which action satisfies this requirement? 

A. Configure each VRF with a default route in the global table by using a static route toward each customer's range, pointing to the customer interface in the global table. 

B. Configure VRF-aware NAT with a default route in the global table for each VRF that requires it 

C. Configure a separate PE-CE subinterface that terminates in the global routing table on the PE. 

D. Configure the Internet upstream interface inside a VRF, Which becomes an extranet VRF to which customers join and make use of NAT in this VRF. 

Answer: D 


Q28. Refer to the exhibit. 

An ISP engineer has been asked to identity a method to protect the PE and to control the number of BGP prefixes learned from his customers. The BGP session should be dropped if the PE router receives more than 1000 BGP prefixes. A syslog message should be generated when the number of BGP prefixes learned from CE exceeds 850. 

Which Cisco IOS command should the engineer apply on PE routers? 

A. neighbor 10.1.1.2 maximum-prefix 1000 85 

B. neighbor 10.1.1.2 maximum-prefix 1000 850 

C. neighbor 10.1.1.2 maximum-prefix 1000 85 warning-only 

D. neighbor 10.1.1.2 maximum-prefix 1000 850 warning-only 

Answer: A 


Q29. QoS is applied on an outgoing interface as shown below: 

What will the QoS result be for egress traffic with an average queue depth of 40 that is marked as DSCP AF32? 

A. Traffic will be dropped with a random rate less than the one defined by MPD. 

B. All traffic will be tail dropped. 

C. Traffic will be dropped with a rate of 1 packet out of 20. 

D. Traffic will be dropped with a rate of 1 packet out of 30. 

Answer: C 


Q30. Refer to the exhibit. 

It displays the Router_3 FIB information without any OSPF LSDB optimization. An engineer wants to optimize the OSPF LSDB in accordance with RFC 1587 Considering the following restraints: 

.Router_3 maintains full connectivity 

.Router_2 requires the least configuration 

In order to achieve the OSPF LSDB optimization on Router_3. which Cisco IOS command should the engineer use on Router_2? 

A. area 1 nssa default-information-originate 

B. area n nssa no-summary 

area 1 nssa no-redistribution 

C. area 1 nssa no-redistribution 

area 1 nssa default-information-originate 

D. area 1 nssa no-summary 

E. area 1 nssa no-redistribution 

F. area 1 nssa no-summary 

area 1 nssa default-information-originate 

Answer: F