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2021 Mar 400-101 practice exam

Q301. Under which condition does UDP dominance occur? 

A. when TCP traffic is in the same class as UDP 

B. when UDP flows are assigned a lower priority queue 

C. when WRED is enabled 

D. when ACLs are in place to block TCP traffic 

Answer:


Q302. Which circumstance can cause TCP starvation and UDP dominance to occur? 

A. Too few queues are available. 

B. UDP is comprised of smaller packets than TCP. 

C. Retransmitted TCP packets are on the network. 

D. UDP and TCP data are assigned to the same service-provider class. 

Answer:


Q303. DRAG DROP 

Drag and drop the DMVPN command on the left to the corresponding function on the right. 

Answer: 


Q304. 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:

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 


Q305. Refer to the exhibit. 

Which statement is true about a valid IPv6 address that can be configured on tunnel interface0? 

A. There is not enough information to calculate the IPv6 address. 

B. 6to4 tunneling allows you to use any IPv6 address. 

C. 2001:7DCB:5901::/128 is a valid IPv6 address. 

D. 2002:7DCB:5901::/128 is a valid IPv6 address. 

Answer:

Explanation: 

Most IPv6 networks use autoconfiguration, which requires the last 64 bits for the host. The first 64 bits are the IPv6 prefix. The first 16 bits of the prefix are always 2002:, the next 32 bits are the IPv4 address, and the last 16 bits of the prefix are available for addressing multiple IPv6 subnets behind the same 6to4 router. Since the IPv6 hosts using autoconfiguration already have determined the unique 64 bit host portion of their address, they must simply wait for a Router Advertisement indicating the first 64 bits of prefix to have a complete IPv6 address. A 6to4 router will know to send an encapsulated packet directly over IPv4 if the first 16 bits are 2002, using the next 32 as the destination, or otherwise send the packet to a well-known relay server, which has access to native IPv6. 

Reference: http://en.wikipedia.org/wiki/6to4 


Latest 400-101 testing engine:

Q306. Refer to the exhibit. 

Which three statements about the device with this configuration are true? (Choose three.) 

A. Multiple AFIs are configured on the device. 

B. The authentication on 172.16.129.7 is configured incorrectly. 

C. The device is configured to support MPLS VPNs. 

D. This device is configured with a single AFI. 

E. The authentication on 172.16.129.4 is configured incorrectly. 

F. The device is configured to support L2VPNs. 

Answer: A,B,C 


Q307. Refer to the exhibit. 

Which statement about authentication on Router A is true? 

A. The router will attempt to authenticate users against TACACS+ only. 

B. The router will attempt to authenticate users against the local database only. 

C. The router will attempt to authenticate users against the local database first, and fall back to TACACS+ if the local database authentication fails. 

D. The router will authenticate users against the default database only. 

E. The router will attempt to authenticate users against TACACS+ first, and fall back to the local database if the TACACS+ authentication fails. 

Answer:


Q308. Refer to the exhibit. 

Which statement about the topology is true? 

A. It provides a transparent LAN service. 

B. It provides only point-to-multipoint connections between UNIs. 

C. It uses port-based connections at the hub. 

D. It provides point-to-point connections between UNIs. 

Answer:


Q309. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 


Q310. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: