Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 20.  D.  The administrative distance of the Routing Information Protocol (RIP) is 120. The 

administrative distance of 90 is used for internal Enhanced Interior Gateway Routing 

Protocol (EIGRP). The administrative distance of 100 is used for Interior Gateway 

Routing Protocol (IGR). The administrative distance of 110 is used for Open Shortest.

 21.  B.  Administrative distance (AD) is an order of reliability between dynamic routing 

protocols and static routes. Administrative distances do not define protocol standards; 

they only reference them. Administrative distances do not allow for the shortest distance 

between routers; they allow the router to choose the best path to the destination 

network. Although administrative distances are programmed into route statements by 

administrators, they do not calculate path selection.

 22.  A.  A directly connected network has an administrative distance (AD) of 0 and is the 

most highly reliable. The administrative distance of 1 is used for static entries. The 

administrative distance of 5 is used for Enhanced Interior Gateway Routing Protocol 

summary routes. Directly connected networks have an AD of 0 that is trusted over all 

other router sources.

 23.  A.  Internal EIGRP has an administrative distance (AD) of 90. The AD of 100 is used for 

Interior Gateway Routing Protocol (IGRP). The administrative distance of 110 is used for 

Open Shortest Path First (OSPF). The administrative distance of the Routing Information 

Protocol (RIP) is 120.

 24.  C.  The administrative distance (AD) is a rating of trust between different routing 

protocols and route methods. This trust scale is important when multiple routes exist 

to the same destination. Directly connected routes have ADs with the highest level 

of trust. Route statements populated by the same dynamic routing protocol will be 

calculated for the best route upon their metric and not their administrative distance. 

The administrative distance is not assigned by the administrator for route selection. The 

administrative distance value is not associated with the cost to the destination, only the 

trust of a route statement.

 25.  A.  Enhanced Interior Gateway Routing Protocol (EIGRP) uses bandwidth and delay by 

default for calculating routes. The bandwidth should be set to the actual bandwidth of the 

link so that routing protocols such as EIGRP can calculate the best route. Delay cannot 

be set because it is a variable of the interface based upon the delay of a packet traversing 

the interface. Reliability cannot be set because it is a variable of the interface based upon 

the reliability of the link. Load cannot be set because it is also a variable of the interface, 

based upon the load of the interface.

 26.  C.  The administrative distance (AD) of EIGRP is 90. The most common ADs are 90 for 

EIGRP, 100 for IGRP, 110 for OSPF, and 120 for RIP. The mnemonic of 90 Exotic Indian 

Oval Rubies will help you remember the order; then starting with EIGRP with a value of 

90, increment the following values by 10.

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Chapter 3: IP Connectivity (Domain 3)