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2021 Mar 400-101 download

Q181. DRAG DROP 

Drag each IS-IS command on the left to its effect on the right. 

Answer: 


Q182. Which two statements about the C-bit and PW type are true? (Choose two.) 

A. The C-bit is 1 byte and the PW type is 15 bytes. 

B. The PW type indicates the type of pseudowire. 

C. The C-bit is 3 bits and the PW type is 10 bits. 

D. The C-bit set to 1 indicates a control word is present. 

E. The PW type indicates the encryption type. 

Answer: B,D 

Explanation: 

The control word carries generic and Layer 2 payload-specific information. If the C-bit is set to 1, the advertising PE expects the control word to be present in every pseudowire packet on the pseudowire that is being signaled. If the C-bit is set to 0, no control word is expected to be present. Pseudowire Type—PW Type is a 15-bit field that represents the type of pseudowire. 

Reference: http://www.ciscopress.com/articles/article.asp?p=386788&seqNum=2 


Q183. An IP SLA fails to generate statistics. How can you fix the problem? 

A. Add the verify-data command to the router configuration. 

B. Reload the router configuration. 

C. Remove the ip sla schedule statement from the router configuration and re-enter it. 

D. Add the debug ip sla error command to the router configuration. 

E. Add the debug ip sla trace command to the router configuration. 

Answer:


Q184. DRAG DROP 

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

Answer: 


Q185. Refer to the exhibit. 

Which two statements about this capture are true? (Choose two.) 

A. It is set to run for five minutes. 

B. It continues to capture data after the buffer is full. 

C. It is set to run for a period of 00:03:26. 

D. It captures data only until the buffer is full. 

E. It is set to use the default buffer type. 

Answer: A,B 


Abreast of the times 400-101 test engine:

Q186. Refer to the exhibit. 

Which statement about the R1 configuration is true? 

A. It permits host 10.1.1.2 to establish a Telnet connection to R1. 

B. It limits remote hosts to two SSH connection attempts. 

C. SSH connections to R1 will log out after a 5-minute idle interval. 

D. Hosts that reside on network 10.0.0.0/8 can SSH to R1. 

E. The R1 timeout for outgoing SSH connection attempts is 30 seconds. 

Answer:

Explanation: 

The timeout for outgoing SSH connection is defined by the “ip sshh time-out” command (in seconds), which is configured here as 30. 


Q187. Refer to the exhibit. 

Which two statements about this route table are true? (Choose two.) 

A. The BGP routes are internal. 

B. The OSPF routes with the E2 flag retain the same metric as they leave the router. 

C. The OSPF routes with the IA flag have their administrative distances incremented as they leave the router. 

D. The BGP routes are external. 

E. The OSPF routes with the E2 flag have their metrics incremented as they leave the router. 

Answer: A,B 

Explanation: 

IBGP routes have an Administrative distance of 200, while EBGP have an AD of 20. Here we see that the BGP routes have an AD value of 200. 

With OSPF, external routes fall under two categories, external type 1 and external type 2. 

The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. The metric for E2 routes do not change when advertising to other routers. 


Q188. Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.) 

A. the forwarding information base 

B. the label forwarding information base 

C. the IP routing table 

D. the label information table 

E. the adjacency table 

Answer: A,B 

Explanation: 

The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames. 

The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS. 


Q189. DRAG DROP 

Drag and drop Layer 2 QoS Commands on the left to the corresponding functions on the right. 

Answer: 


Q190. Refer to the exhibit. 

Which technology does the use of bi-directional BPDUs on all ports in the topology support? 

A. RSTP 

B. MST 

C. Bridge Assurance 

D. Loop Guard 

E. Root Guard 

F. UDLD 

Answer:

Explanation: 

Spanning Tree Bridge Assurance 

. Turns STP into a bidirectional protocol 

. Ensures spanning tree fails “closed” rather than “open” 

. If port type is “network” send BPDU regardless of state 

. If network port stops receiving BPDU it’s put in BA-inconsistent state 

Bridge Assurance (BA) can help protect against bridging loops where a port becomes designated because it has stopped receiving BPDUs. This is similar to the function of loop guard. 

Reference: http://lostintransit.se/tag/convergence/