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Exam 21: OSPF Network Types and Neighbors

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Question 1

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Which network type does OSPF use by default on all types of Ethernet interfaces?

A) Point-to-point
B) Point-to-multipoint
C) Broadcast
D) Non-broadcast multi-access

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Question 2

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If an engineer were configuring an older type of interface (i.e. not Ethernet) and would like to configure the interface to use the broadcast network type, which of the following interface subcommands would that engineer need to use?

A) config ospf ip network broadcast
B) ip ospf network broadcast
C) ip ospf network type broadcast
D) config ip ospf type network broadcast

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Question 3

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Which value would you want to configure first, in order to influence DR/BDR election?

A router has been a working part of a network that uses OSPFv2. An engineer then issues the shutdown command in OSPF configuration mode on that the router. Which of the following occurs?

Two routers are both connected to the same Ethernet LAN and configured to use OSPFv2. What combination of settings would prevent the two routers from becoming OSPF neighbors?

Review the output from the show ip ospf interface brief command shown below. According to this output, how many routers is MyRouter full adjacent over its Gi0/1 interface? $\text {MyRouter\# show ip ospf interface brief}$ $\begin{array}{cccccccc} \text {Interface }& \text {PID }& \text {Area} & \text {IP Address/Mask} &\text { Cost} &\text { State }&\text { Nbrs} & \text {F/C} \\\text {Gi0/1} & 1 & 0 & 192.168 .1 .4 / 24 & 1 && \text {DROTH} & 0 / 1 \end{array}$

Which of the following is true regarding the OSPF point-to-point network type? (Select all that apply.)

Which of the following statements regarding DR/BDR election is false?

Review the output from the show ip ospf interface brief command shown below. According to this output, MyRouter has how many total neighbors? $\text {MyRouter\# show ip ospf interface brief}$ $\begin{array}{cccccccc} \text {Interface }& \text {PID }& \text {Area} & \text {IP Address/Mask} &\text { Cost} &\text { State }&\text { Nbrs} & \text {F/C} \\\text {Gi0/1} & 1 & 0 & 192.168 .1 .4 / 24 & 1 && \text {DROTH} & 0 / 1 \end{array}$

Which of the following statements regarding shutting down the OSPF process is false?

Which Cisco IOS command could an engineer use if she wanted to see which network type is set for an interface?

An engineer is troubleshooting an OSPF neighbor relationship. He wants to ensure that hello and dead timers match, as a mismatch could prevent the routers from becoming neighbors. Which is the best Cisco IOS command to check the hello and dead timers?

Routers often have a default MTU size of _____ ?

In a scenario where two routers tie in priority, which value is used by the election process to choose the DR?

An engineer would like router MyRouter to be elected to the DR. Which configuration makes the most sense for this engineer as a way to influence which router is chosen as the DR?