Update Cisco 400-101 - An Overview 161 to 170

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2021 Apr 400-101 exam

Q161. Refer to the exhibit. 

If a connection failure occurs between R1 and R2, which two actions can you take to allow CR-1 to reach the subnet 192.168.192.0/24 on R2? (Choose two.) 

A. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into OSPF. 

B. Turn up a BGP session between CR-1 and R1. 

C. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into BGP. 

D. Turn up an EIGRP session between R1 and R3 with AS 65535. 

E. Create an OSPF virtual link between CR-1 and R2 to bypass R1. 

Answer: A,B 


Q162. Refer to the exhibit. 

Which command can you enter to resolve this error message on a peer router? 

A. username <username> password <password> 

B. ppp chap <hostname> 

C. aaa authorization exec if-authenticated 

D. aaa authorization network if-authenticated 

Answer:


Q163. Which statement about NAT64 is true? 

A. It uses one-to-one mapping between IPv6 addresses and IPv4 addresses. 

B. It requires static address mapping between IPv6 addresses and IPv4 addresses. 

C. It can be used to translate an IPv6 network to another IPv6 network. 

D. It can be configured for stateless and stateful translation. 

Answer:


Q164. 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:


Q165. Refer to the exhibit. 

You discover that only 1.5 Mb/s of web traffic can pass during times of congestion on the given network. 

Which two options are possible reasons for this limitation? (Choose two.) 

A. The web traffic class has too little bandwidth reservation. 

B. Video traffic is using too much bandwidth. 

C. The service-policy is on the wrong interface. 

D. The service-policy is going in the wrong direction. 

E. The NAT policy is adding too much overhead. 

Answer: A,B 

Explanation: 

In this example, the web traffic will fall into the default class, which is only 15 percent of the 10Mbps Internet connection (1.5Mbps). Meanwhile, video traffic is allowed 50% of the 10 Mbps. 


Improve 400-101 practice test:

Q166. Which three factors does Cisco PfR use to calculate the best exit path? (Choose three.) 

A. quality of service 

B. packet size 

C. delay 

D. loss 

E. reachability 

F. administrative distance 

Answer: C,D,E 

Explanation: 

Cisco PfR selects an egress or ingress WAN path based on parameters that affect application performance, including reachability, delay, cost, jitter, and Mean Opinion Score (MOS). 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/performance-routing-pfr/product_data_sheet0900aecd806c4ee4.html 


Q167. DRAG DROP 

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

Answer: 


Q168. On a broadcast interface, which two OSPF states support BFD sessions? (Choose two.) 

A. DR 

B. BDR 

C. DROTHER 

D. 2WAY 

E. FULL 

F. ACTIVE 

Answer: A,B 


Q169. Which three steps are necessary to enable SSH? (Choose three.) 

A. generating an RSA or DSA cryptographic key 

B. configuring the version of SSH 

C. configuring a domain name 

D. configuring VTY lines for use with SSH 

E. configuring the port for SSH to listen for connections 

F. generating an AES or SHA cryptographic key 

Answer: A,C,D 

Explanation: 

Here are the steps: 

1. Configure a hostname for the router using these commands. 

yourname#configure terminal 

Enter configuration commands, one per line. End with CNTL/Z. 

yourname (config)#hostname LabRouter 

LabRouter(config)# 

2. Configure a domain name with the ip domain-name command followed by whatever you would like your domain name to be. I used CiscoLab.com. 

LabRouter(config)#ip domain-name CiscoLab.com 

3. We generate a certificate that will be used to encrypt the SSH packets using the crypto key generate rsa command. 

Take note of the message that is displayed right after we enter this command. “The name for the keys will bE. LabRouter.CiscoLab.com” — it combines the hostname of the router along with the domain name we configured to get the name of the encryption key generated; this is why it was important for us to, first of all, configure a hostname then a domain name before we generated the keys. 

Notice also that it asks us to choose a size of modulus for the key we’re about to generate. 

The higher the modulus, the stronger the encryption of the key. For our example, we’ll use a modulus of 1024. 


Q170. Which technology facilitates dynamic tunnel establishment in DMVPN? 

A. CEF 

B. mGRE 

C. a dynamic routing protocol 

D. NHRP 

Answer: