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2021 Jul actual tests 400-101:

Q241. What are two benefits of Per-Tunnel QoS for DMVPN? (Choose two.) 

A. The administrator can configure criteria that, when matched, can automatically set up QoS for each spoke as it comes online. 

B. Traffic from each spoke to the hub can be regulated individually. 

C. When traffic exceeds a configurable threshold, the spokes can automatically set up QoS with the hub. 

D. The hub can send large packets to a spoke during allotted timeframes. 

E. The hub can be regulated to prevent overloading small spokes. 

Answer: A,E 


Q242. Which two pieces of information does RTCP use to inform endpoint devices about the RTP flow? (Choose two.) 

A. the transmitted octet 

B. the lost packet count 

C. session control function provisioning information 

D. the CNAME for session participants 

E. the authentication method 

F. MTU size changes in the path of the flow 

Answer: A,B 

Explanation: 

RTCP transports statistics for a media connection and information such as transmitted octet and packet counts, packet loss, packet delay variation, and round-trip delay time. An application may use this information to control quality of service parameters, perhaps by limiting flow, or using a different codec. 

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


Q243. Refer to the exhibit. 


Which statement is true? 

A. There is an MPLS network that is running 6PE, and the ingress PE router has no mpls ip propagate-ttl. 

B. There is an MPLS network that is running 6VPE, and the ingress PE router has no mpls ip propagate-ttl. 

C. There is an MPLS network that is running 6PE or 6VPE, and the ingress PE router has mpls ip propagate-ttl. 

D. There is an MPLS network that is running 6PE, and the ingress PE router has mpls ip propagate-ttl. 

E. There is an MPLS network that is running 6VPE, and the ingress PE router has mpls ip propagate-ttl. 

Answer: C 

Explanation: 

The second hop shows and IPV6 address over MPLS, so we know that there is an MPLS network running 6PE or 6VPE. And because the second and third hops show up in the traceroute. Then TTL is being propagated because if the “no ip propagate-ttl” command was used these devices would be hidden in the traceroute. 


Q244. DRAG DROP 


Answer: 



Q245. Refer to the exhibit. 


R1 and R2 both advertise 10.50.1.0/24 to R3 and R4 as shown. R1 is the primary path. Which path does traffic take from the R4 data center to the file server? 

A. All traffic travels from R4 to R2 to the file server. 

B. All traffic travels from R4 to R3 to R1 to the file server. 

C. Traffic is load-balanced from R4 to R2 and R3. Traffic that is directed to R3 then continues to R1 to the file server. Traffic that is directed to R2 continues to the file server. 

D. All traffic travels from R4 to R2 to R1 to the file server. 

Answer: A 


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Most up-to-date cisco 400-101:

Q246. Independent, multiple OSPF processes are entered on the same router, and the processes have the same destination route. Which OSPF process is used? 

A. The route with the fewest hops is used. 

B. Both processes are used to load balance the traffic. 

C. The first route process that places a route into the routing table is used. 

D. The route with the shortest prefix is used. 

Answer: C 


Q247. When VRF-Lite is configured without BGP support,.which statement about the configuration of the route target and route distinguisher is true? 

A. The configuration of the route target and route distinguisher is required. 

B. The configuration of the route target and route distinguisher is not required. 

C. The configuration of the route target is required and the configuration of the route distinguisher is not required. 

D. The configuration of the route target is not required and the configuration of the route distinguisher is required. 

Answer: D 


Q248. DRAG DROP 

Drag each traceroute text character on the left to its meaning on the right. 


Answer: 



Q249. Which two statements about IPsec VTI implementation are true? (Choose two.) 

A. The IKE SA can be bound to the VTI and the crypto map. 

B. The transform set can be configured only in tunnel mode. 

C. SVTIs support only a single IPsec SA. 

D. SVTIs support IPv4 packets that carry IPv6 packets. 

Answer: B,C 


Q250. Which statement describes the function of rekey messages? 

A. They prevent unencrypted traffic from passing through a group member before registration. 

B. They refresh IPsec SAs when the key is about to expire. 

C. They trigger a rekey from the server when configuring the rekey ACL. 

D. They authenticate traffic passing through a particular group member. 

Answer: B 

Explanation: 

Rekey messages are used to refresh IPsec SAs. When the IPsec SAs or the rekey SAs are about to expire, one single rekey message for a particular group is generated on the key server. No new IKE sessions are created for the rekey message distribution. The rekey messages are distributed by the key server over an existing IKE SA. Rekeying can use multicast or unicast messages. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_getvpn/configuration/xe-3s/sec-get-vpn-xe-3s-book/sec-get-vpn.html