Ccna certification Practice Tests

396

 

Appendix 

■

  Answers to Practice Test Questions

 48.  C.  The command 

passive-interface serial 0/0 configured in the router instance 

will suppress updates from exiting interface Serial 0/0. The command 

ip rip passive-

interface is incorrect. The command rip passive-interface is incorrect. The 

command 

ip rip suppress-advertisement is incorrect.

 49.  B.  RIPv2 has extremely slow convergence time. This is because the advertisement of 

routes is every 30 seconds. So a router 4 hops away could take 120 seconds before 

discovering the route. Configuration for RIPv2 is rather simple compared to other 

protocols, such as Open Shortest Path First (OSPF). RIPv2 uses multicasts to send the 

complete route table to other participating routers; RIPv1 uses broadcasts. The RIPv2 

protocol supports classless networks; RIPv1 does not support classless networks.

 50.  A.  Split horizons are used to stop routing loops with RIPv2. Split horizons prevent a 

router from advertising a route to a router in which the original route was discovered. 

Advertisement intervals can be adjusted to allow RIPv2 to converge faster. Zoning is 

not a design concept for RIP; therefore, it is an invalid answer. The invalid timers can be 

adjusted for faster convergence as well.

 51.  C.  RIPv2 uses the Bellman-Ford algorithm to calculate its metrics. The Open Shortest 

Path First (OSPF) protocol uses the Shortest Path First (SPF) algorithm, which is also 

called the Dijkstra algorithm. Diffusing Update Algorithm (DUAL) is used by Enhanced 

Interior Gateway Routing Protocol (EIGRP).

 52.  D.  The command 

no auto-summary will stop the router process of RIPv2 from auto-

summarizing network addresses. In a discontiguous network, this is problematic and 

should be turned off. The command 

network discontiguous is incorrect, regardless 

of which prompt it is configured in. The command 

no auto-summary is incorrect when 

configured from the global configuration prompt.

 53.  B.  Configuring RIPv2 begins with configuration of the router instance of RIP via 

the command 

router rip. RIPv2 is configured inside of the router instance with the 

command 

version 2. Then the network of 192.168.20.0/24 is advertised with the 

command 

network 192.168.20.0. All of the other options are incorrect.

 54.  C.  Static routing is best suited for small networks in which there is not a lot of change. 

It should be chosen when administrators want absolute control over the routing process. 

Open Shortest Path First (OSPF) is suited for large-scale networks because of its 

scalability. The Enhanced Interior Gateway Routing Protocol (EIGRP) is also a relatively 

scalable dynamic routing protocol. The Routing Information Protocol (RIP) is well suited 

for medium-sized to smaller networks, where administrators do not want to control 

routing.

 55.  C.  The command 

show ipv6 interfaces brief will show all of the IPv6 addresses 

configured for each of the interfaces on the router. The command 

show ipv6 is incorrect. 

The command 

show ip interfaces brief is incorrect. The command show ipv6 

brief is incorrect.

---

Chapter 7: Practice Exam 1