Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 32.  B.  Increased redundancy of connections is a direct benefit of a full mesh topology. 

Although bandwidth will increase because of multiple paths, additional dynamic routing 

protocols will need to be implemented to achieve this. A full mesh topology will not 

decrease the switch count and can even require more switching equipment because of the 

number of connections. When a full mesh topology is employed, it increases complexity, 

but this is not considered a benefit.

 33.  C.  The hybrid topology is most often seen at the access layer. The devices are connected 

in a star topology and the access layer switches are partially meshed to the distribution 

layer switches. The distribution layer is normally connected with a full mesh topology. 

Routing layer is not terminology used to describe one of the three layers in the Cisco 

three-tier design model.

 34.  B.  Distribution layer switches are fully meshed for redundancy. The number of links 

can be calculated with the formula of N(N – 1). So if you had four distribution switches, 

the ports required for a full mesh would be 4(4 – 1) = 4 × 3 = 12 ports among the four 

switches. The formula of N(N – 1) / 2 would give you the number of links (connected 

ports): 4(4 – 1) / 2 = 4 × 3 / 2 = 6 links. The core layer is normally implemented with a 

star topology. The access layer is normally implemented with a partial mesh topology or 

hybrid topology. Routing layer is not a valid term in the Cisco three-tier design model.

 35.  A.  Core layer switches are commonly set up in a star topology. This is because core layer 

switches connect multiple campuses via distribution layer switches. The distribution 

layer is normally implemented with a full mesh topology. The access layer is normally 

implemented with a hybrid topology. Routing layer is not a valid term in the Cisco three-

tier design model.

 36.  A.  The collapsed core layer switch uses a star topology connecting outward to the access 

layer switches. This design is often found in small enterprise and single campus design. 

The full mesh topology is normally found at the distribution layer in the Cisco three-tier 

design model. The partial mesh or hybrid topology is often found at the access layer in the 

Cisco three-tier design.

 37.  C.  The two-tier, or collapsed core, model contains only the distribution and access layer 

switches. The three-tier design model contains the core, distribution, and access layer 

switches. The core and distribution layer switches are found in the upper two layers of the 

Cisco three-tier design model. There is no such thing as the Internet layer in any of the 

design models.

 38.  A.  Based on the layout of your network, the collapsed core model is the most appropriate 

model to design. If at a later time other campuses are joined to the network, the core 

layer can be added. The three-tier model is better situated for a network with multiple 

campuses. DOD model is a term used when referring to the layers of the OSI model in a 

macro model. Access model is not a term used with switching and routing design.

 39.  C.  The collapsed core design model is best suited for small enterprises. It can later be 

expanded out to a three-tier model as an enterprise grows in size. It has no effect on 

bandwidth if designed right. The collapsed core design does not and should not bottleneck 

bandwidth.

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Chapter 1: Network Fundamentals (Domain 1)