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2021 Apr 400-101 practice exam

Q281. Refer to the exhibit. 

What is the meaning of the asterisk (*) in the output? 

A. PIM neighbor 10.1.5.6 is the RPF neighbor for the group 232.1.1.1 for the shared tree. 

B. PIM neighbor 10.1.5.6 is the one that is seen as the RPF neighbor when performing the command show ip rpf 10.1.4.7. 

C. PIM neighbor 10.1.5.6 is the winner of an assert mechanism. 

D. The RPF neighbor 10.1.5.6 is invalid. 

Answer:

Explanation: 

show ip mroute 

Field 

Descriptions 

Field Description 

RPF neighbor or RPF nbr 

IP address of the upstream router to the source. Tunneling indicates that this router is sending data to the RP encapsulated in register packets. 

The hexadecimal number in parentheses indicates to which RP it is registering. Each bit indicates a different RP if multiple RPs per group are used. If an asterisk (*) appears after the IP address in this field, the RPF neighbor has been learned through an assert. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult 3.html 


Q282. Refer to the exhibit. 

The device with this configuration is unable to reach network 172.31.31.0/24. The next hop router has been verified to have full connectivity to the network. Which two actions can you take to establish connectivity to the network? (Choose two.) 

A. Create a static route to 172.16.199.0 using the address of the next hop router. 

B. Create a default route to the link address of the next hop router. 

C. Create a static route to the loopback address of the next hop router. 

D. Create a default route to 172.16.199.9. 

E. Modify the existing static route so that the next hop is 0.0.0.0. 

F. Replace the ip default-network command with the ip default-gateway command. 

Answer: A,B 

Explanation: 

Unlike the ip default-gateway command, you can use ip default-network when ip routing is enabled on the Cisco router. When you configure ip default-network the router considers routes to that network for installation as the gateway of last resort on the router. 

For every network configured with ip default-network, if a router has a route to that network, that route is flagged as a candidate default route. However, in this case if the router does not a route to the drfault network of 172.16.199.9, then you would need to ensure that this route exisits by creating a static route to 172.16.199.0 using the address of the next hop router, or simply create a default route using the address of the next hop router. 


Q283. A configuration includes the line ip nbar port-map SSH tcp 22 23 443 8080. Which option describes the effect of this configuration line? 

A. It configures NBAR to search for SSH using ports 22, 23, 443, and 8080. 

B. It configures NBAR to allow SSH connections only on ports 22, 23, 443, and 8080. 

C. It enables NBAR to inspect for SSH connections. 

D. It creates a custom NBAR port-map named SSH and associates TCP ports 22, 23, 443, and 8080 to itself. 

Answer:

Explanation: 

The ip nbar-port-map command configures NBAR to search for a protocol or protocol name using a port number other than the well-known port. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/command/reference/fqos_r/qrfcmd10.pd f 


Q284. Assume that the following MAC addresses are used for the bridge ID MAC address by four different switches in a network. Which switch will be elected as the spanning-tree root bridge? 

A. SwitchA uses MAC 1000.AA-AA-AA-AA-AA-AA. 

B. SwitchB uses MAC 2000.BB-BB-BB-BB-BB-BB. 

C. SwitchC uses MAC 3000.CC-CC-CC-CC-CC-CC. 

D. SwitchD uses MAC 4000.DD-DD-DD-DD-DD-DD. 

Answer:

Explanation: 

The switch with the highest switch priority (the lowest numerical priority value) is elected as the root switch. If all switches are configured with the default priority (32768), the switch with the lowest MAC address in the VLAN becomes the root switch. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swstp.html 


Q285. Which three responses can a remote RADIUS server return to a client? (Choose three.) 

A. Reject-Challenge 

B. Access-Reject 

C. Accept-Confirmed 

D. Access-Accept 

E. Access-Challenge 

F. Reject-Access 

Answer: B,D,E 


Updated 400-101 exam cost:

Q286. DRAG DROP 

Drag and drop the NAT operations on the left into the correct sequential order on the right. 

Answer: 


Q287. DRAG DROP 

Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 

Answer: 


Q288. How are the Cisco Express Forwarding table and the FIB related to each other? 

A. The FIB is used to populate the Cisco Express Forwarding table. 

B. The Cisco Express Forwarding table allows route lookups to be forwarded to the route processor for processing before they are 

C. There can be only one FIB but multiple Cisco Express Forwarding tables on IOS devices. 

D. Cisco Express Forwarding uses a FIB to make IP destination prefix-based switching decisions. 

Answer:


Q289. Which two statements about BGP loop prevention are true? (Choose two.) 

A. Advertisements from PE routers with per-neighbor SOO configured include a Site of Origin value that is equal to the configured value of the BGP peering. 

B. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop. 

C. AS-override aids BGP loop prevention, but alternate loop prevention mechanisms are also necessary. 

D. Advertisements from the neighbors a BGP peering include a Site of Origin value that is separate from the configured value of the BGP peering. 

E. If the configured Site of Origin value of a BGP peering is greater than the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop. 

F. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is permitted. 

Answer: A,B 


Q290. Refer to the exhibit. 

Which two route types are advertised by a router with this configuration? (Choose two.) 

A. connected 

B. external 

C. summary 

D. static 

E. redistributed 

Answer: A,C