Ccna certification Practice Tests

265

 55.  A.  The pseudo interface must be created first with the command  

interface multilink 1. Then the encapsulation must be set to PPP with 

encapsulation ppp. The ppp multilink command configures the ability to use 

multilink for the encapsulation of PPP. Then the IP address is configured. Last, the  

ppp multilink group 1 command associates the interface multilink 1 with the multilink 

group to be used for bundling. All of the other options are incorrect.

 56.  B.  The first step is to set the username of RouterB to use for authentication via  

username RouterB password cisco. Then enter the interface, in this case using the 

interface serial 0/1/0 command, and configure authentication with the command 

ppp authentication chap pap. All of the other options are incorrect.

 57. D. The 

LCP closed line states that the LCP process has not completed. This could be 

due to numerous reasons, such as conflicting options or authentication failure. When the 

LCP process has completed, it will be in an “open” state when reviewing the interface. 

The router does not need to have an IP address configured, since this is a layer 2 

communication process. If the serial line was disconnected, the interface would show as 

down with a line protocol of down.

 58.  B.  Asymmetrical Digital Subscriber Line (ADSL) connectivity typically uses PPPoE to 

authenticate subscribers. The subscriber’s credentials are often relayed to a RADIUS 

server for subscription checks. Metro Ethernet is a WAN connectivity method and not 

a protocol that is used with ADSL. PPP does not need to be configured for use over an 

ADSL connection, but the authentication portion of PPPoE must be configured. MPLS is a 

WAN connectivity method and not a protocol that is used with ADSL.

 59.  A.  AWS and Microsoft Azure are examples of public cloud providers. Private clouds are 

internally created, and hybrid clouds are a combination of services between your private 

cloud and the public cloud. Private clouds are purchased and maintained by a private 

entity and not available for public use, usually on your internal network. Hybrid clouds 

are a mixture of private and public clouds, usually where your infrastructure exists 

partially in the public cloud and partially in your private cloud. There is no such thing 

as dynamic cloud providers since all cloud providers must have a level of elasticity for 

their clients.

 60.  B.  If you were looking to create a fault tolerant colocation site as a cloud provider, you 

would be searching for an Infrastructure as a Service (IaaS) provider. This would allow 

you to install your own operation system and applications. A Platform as a Service (PaaS) 

solution is similar to running applications in the cloud, where the platform supports  

some level of programming language, such as Python, Ruby, or Visual Basic. Software 

as a Service (SaaS) is probably the most common, since services such as email, contract 

management, and many others are hosted by SaaS providers. Backup as a Service is 

popular today because it can allow for the long-term storage of data offline after a backup 

has completed.

 61.  C.  Automated billing is not a NIST criterion for cloud computing. It is essential for the 

cloud computing vendor but is not relevant if you are hosting your own private cloud. The 

five NIST criteria for cloud computing are on-demand self-service, broad network access, 

resource pooling, rapid elasticity, and measured service.

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