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2021 Mar 400-101 test engine

Q461. Which statement about the VLAN database is true? 

A. Manually deleting the vlan.dat file can cause inconsistency in the database. 

B. Private VLAN information is stored in the database. 

C. VLAN configurations 1 through 4096 are stored in the vlan.dat file. 

D. The VLAN database is used only if the VTP domain name in the VLAN database matches the VTP domain name in the startup-config file. 

Answer: A 


Q462. Consider an OSPFv3 network with four parallel links between each pair of routers. Which measure can you use to reduce the CPU load and at the same time keep all links available for ECMP? 

A. Configure some interfaces as passive interface. 

B. Configure ipv6 ospf priority 0 on some interfaces. 

C. Configure some routers with a distribute list in ingress of the OSPFv3 process. 

D. Configure ipv6 ospf database-filter all out on some interfaces. 

Answer: D 

Explanation: 

To filter outgoing link-state advertisements (LSAs) to an Open Shortest Path First version 3 (OSPFv3) interface, use the ipv6 ospf database-filter all out command in interface configuration mode. This can be done on some of the links to reduce the CPU load while still ensuring that all links in the equal cost path are still being used. 


Q463. What does a nonzero forwarding address indicate in a type-5 LSA? 

A. It indicates that this link-state ID is eligible for ECMP. 

B. It indicates that this router should have an OSPF neighbor relationship with the forwarding address before using this link-state ID. 

C. It indicates that the receiving router must check that the next hop is reachable in its routing table before using this link-state ID. 

D. It indicates that traffic can be directly routed to this next hop in shared segment scenarios where the external route source is directly connected. 

Answer: D 

Explanation: 

The value of the forwarding address specified by the autonomous system boundary router (ASBR) can be either 0.0.0.0 or non-zero. The 0.0.0.0 address indicates that the originating router (the ASBR) is the next hop. The forwarding address is determined by these conditions: 

. The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes. 

. These conditions set the forwarding address field to a non-zero address: ASBR's next hop interface address falls under the network range specified in the router ospf command. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13682-10.html 


Q464. A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment? 

A. Modify the spanning-tree priorities to dictate the traffic flow. 

B. Create a Layer 3 transit VLAN to segment the traffic between the sites. 

C. Use VTP pruning on the trunk interfaces. 

D. Configure manual trunk pruning between the two locations. 

Answer: C 


Q465. In the DiffServ model, which class represents the lowest priority with the highest drop probability? 

A. AF11 

B. AF13 

C. AF41 

D. AF43 

Answer: B 

Explanation: 

Assured Forwarding (AF) Behavior Group 

Class 1 

Class 2 

Class 3 

Class 4 

Low Drop 

AF11 (DSCP 10) 

AF21 (DSCP 18) 

AF31 (DSCP 26) 

AF41 (DSCP 34) 

Med Drop 

AF12 (DSCP 12) 

AF22 (DSCP 20) 

AF32 (DSCP 28) 

AF42 (DSCP 36) 

High Drop 

AF13 (DSCP 14) 

AF23 (DSCP 22) 

AF33 (DSCP 30) 

AF43 (DSCP 38) 

Reference: http://en.wikipedia.org/wiki/Differentiated_services 


Renewal 400-101 torrent:

Q466. What is a reason for an EIGRP router to send an SIA reply to a peer? 

A. to respond to an SIA query with the alternative path requested 

B. to respond to a query reporting that the prefix has gone stuck-in-active 

C. to respond to an SIA query that the router is still waiting on replies from its peers 

D. to respond to a reply reporting that the prefix has gone stuck-in-active 

Answer: C 


Q467. In a nonbackbone OSPF area, all traffic that is destined to the Internet is routed by using a default route that is originated by the ABR. Which change in the configuration of the OSPF area type causes traffic from that area that is destined to the Internet to be dropped? 

A. The OSPF area changes from NSSA to totally stubby area. 

B. The OSPF area changes from NSSA to regular area. 

C. The OSPF area changes from stub area to totally stubby area. 

D. The OSPF area changes from stub area to NSSA. 

Answer: D 

Explanation: 

The ABR for the NSSA generates the default route, but not by default. To force the ABR to generate the default route, use the area <area id> nssa default-information originate command. The ABR generates a Type 7 LSA with the link-state ID 0.0.0.0 and is advertised inside the NSSA. This default route will be propagated inside the NSSA as Type 7 LSA 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13692-21.html#nssas 


Q468. Which two statements about HSRP are true? (Choose two.) 

A. Its virtual MAC is 0000.0C07.Acxx. 

B. Its multicast virtual MAC is 0000.5E00.01xx. 

C. Its default configuration allows for pre-emption. 

D. It supports tracking. 

E. It supports unique virtual MAC addresses. 

Answer: A,D 

Explanation: 

Default HSRP Configuration 

Feature 

Default Setting 

HSRP version 

Version 1 

HSRP groups 

None configured 

Standby group number 

0 

Standby MAC address 

System assigned as: 0000.0c07.acXX, where XX is the HSRP group number 

Standby priority 

100 

Standby delay 

0 (no delay) 

Standby track interface priority 

10 

Standby hello time 

3 seconds 

Standby holdtime 

10 seconds 

. The standby track interface configuration command ties the router hot standby priority to the availability of its interfaces and is useful for tracking interfaces that are not configured for HSRP. When a tracked interface fails, the hot standby priority on the device on which tracking has been configured decreases by 10. If an interface is not tracked, its state changes do not affect the hot standby priority of the configured device. For each interface configured for hot standby, you can configure a separate list of interfaces to be tracked. 

. The standby track interface-priority interface configuration command specifies how much to decrement the hot standby priority when a tracked interface goes down. When the interface comes back up, the priority is incremented by the same amount. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_55_se/configuration/guide/3750xscg/swhsrp.html 


Q469. DRAG DROP 

Drag and drop the extended ping command field on the left to its usage on the right. 

Answer: 


Q470. Refer to the exhibit. 

Which configuration reduces CPU utilization on R2 while still advertising the connected routes of R2 to R1? 

A. Configure eigrp stub connected on R2. 

B. Configure eigrp stub receive-only on R1. 

C. Configure eigrp stub static on R2. 

D. Configure eigrp stub summary on R1. 

Answer: A