Ccna certification Practice Tests

380

 

Appendix 

■

  Answers to Practice Test Questions

 30.  B.  The campus networking model is a traditional networking model that is deployed 

as either a three-tier model with a core, distribution, and access layer or a collapsed 

core model. In the collapsed core model, the core and distribution layers are the same 

functional equipment. The Spine/Leaf, also known as the CLOS model, is commonly 

found in software-defined networking (SDN).

 31.  C.  The software-defined network (SDN) controller replaces the control plane on SDN 

devices. The SDN devices in the network do not contain a control plane locally and 

instead are controlled by the SDN controller. The SDN controller does not configure 

the management plane of the network devices; it replaces the management plane of the 

network devices. The SDN controller does not monitor the data plane of traffic; it only 

controls the traffic. The SDN controller does not complement the control plane of the 

SDN device; it replaces the control plane of the SDN device.

 32.  A.  Application Policy Infrastructure Controller - Enterprise Module (APIC-EM) is a 

Cisco SDN controller. This package is freely downloadable from the Cisco DevNet website 

as of the writing of this book. It comes with several built-in apps, such as a plug and play 

module and a path trace module. Many other apps can be built on top of the APIC to 

extend functionality of the controller. However, the product has been largely replaced 

with Cisco DNA and is now licensed. OpenSDN is an open-source SDN controller 

platform that utilized the open-source OpenDaylight (ODL) protocol. OpenStack is 

another open-source SDN controller aimed at data centers.

 33.  B.  The control plane refers to any mechanism that controls the data plane. STP is used 

to control the data plane by removing redundant links. The data plane is responsible for 

switching and routing data. Any data that is destined for endpoints is switched or routed 

on the data plane. The management plane is any mechanism that helps in the management 

of a router or switch. Switch plane is not a term normally used to describe data types; 

therefore, option D is an invalid answer.

 34.  C.  The management plane is any mechanism that helps in the management of a router or 

switch. Some of the common mechanisms are SSH and Telnet. However, any mechanism 

that the router uses for management is considered part of the management plane. The 

control plane refers to any mechanism that controls the data plane. The data plane is 

responsible for switching and routing data. Any data that is destined for endpoints is 

switched or routed on the data plane. Switch plane is not a term normally used to describe 

data types; therefore, option D is an invalid answer.

 35.  A.  The data plane is responsible for switching and routing data. Any data that is destined 

for endpoints is switched or routed on the data plane. For example, when one computer 

pings another, the ping is switched and routed on the data plane. The control plane refers 

to any mechanism that controls the data plane. The management plane is any mechanism 

that helps in the management of a router or switch. Switch plane is not a term normally 

used to describe data types; therefore, option C is an invalid answer.

---

Chapter 6: Automation and Programmability (Domain 6)