Question 1

Routers often have a default MTU size of _____ ?

Accepted Answer

A)  68 
B)  1356 
C)  1500 
D)  576 
A)  68 
B)  1356 
C)  1500 
D)  576 C

Question 2

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?

Accepted Answer

A)  Set the OSPF priority of MyRouter to 1. 
B)  Set the OSPF RID of MyRouter to 1.1.1.1. 
C)  Set the OSPF priority of MyRouter to 99. 
D)  Set the OSPF RID of MyRouter to 9.9.9.9 
A)  Set the OSPF priority of MyRouter to 1. 
B)  Set the OSPF RID of MyRouter to 1.1.1.1. 
C)  Set the OSPF priority of MyRouter to 99. 
D)  Set the OSPF RID of MyRouter to 9.9.9.9 C

Question 3

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

Accepted Answer

A)  show interface 
B)  show ip ospf interface 
C)  show ospf ip 
D)  show route 
A)  show interface 
B)  show ip ospf interface 
C)  show ospf ip 
D)  show route B

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

A)  Shutting down the OSPF process brings down all neighbor relationships and clears the OSPF neighbor table. 
B)  Shutting down the OSPF process clears the LSBD. 
C)  Shutting down the OSPF process clears the IP routing table and any OSPF-learned routes. 
D)  Shutting down the OSPF process results in the deletion of all the OSPF configurations. 
A)  Shutting down the OSPF process brings down all neighbor relationships and clears the OSPF neighbor table. 
B)  Shutting down the OSPF process clears the LSBD. 
C)  Shutting down the OSPF process clears the IP routing table and any OSPF-learned routes. 
D)  Shutting down the OSPF process results in the deletion of all the OSPF configurations.

Question 6

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

Accepted Answer

A)  If the DR fails, the BDR becomes the DR, and a new BDR is elected. 
B)  If the DR fails, the BDR becomes the DR. However, if the original DR is brought back online, it resumes its role as DR. 
C)  When a better router enters the subnet, no preemption of the existing DR and BDR occurs. 
D)  OSPF DR/BDR election rules will not result in a specific router always being the DR, and another always being the BDR. 
A)  If the DR fails, the BDR becomes the DR, and a new BDR is elected. 
B)  If the DR fails, the BDR becomes the DR. However, if the original DR is brought back online, it resumes its role as DR. 
C)  When a better router enters the subnet, no preemption of the existing DR and BDR occurs. 
D)  OSPF DR/BDR election rules will not result in a specific router always being the DR, and another always being the BDR.

Question 7

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

Accepted Answer

A)  DR/BDR should be implemented when using the point-to-point network type. 
B)  There is no benefit to using DR/BDR when using the point-to-point network type. 
C)  The point-to-point network type exists for links that support 3 or more routers on the link (such as Ethernet). 
D)  The point-to-point network type exists for links that do not support the ability to add a third router to the link (such as serial links). 
A)  DR/BDR should be implemented when using the point-to-point network type. 
B)  There is no benefit to using DR/BDR when using the point-to-point network type. 
C)  The point-to-point network type exists for links that support 3 or more routers on the link (such as Ethernet). 
D)  The point-to-point network type exists for links that do not support the ability to add a third router to the link (such as serial links).

Question 8

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

Accepted Answer

A)  OSPF interface priority 
B)  OSPF network type 
C)  OSPF router ID 
D)  OSPF cost 
A)  OSPF interface priority 
B)  OSPF network type 
C)  OSPF router ID 
D)  OSPF cost

Question 9

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?

Accepted Answer

A)  show ip ospf 
B)  show ip ospf interface 
C)  show ip ospf interface brief 
D)  show interface brief 
A)  show ip ospf 
B)  show ip ospf interface 
C)  show ip ospf interface brief 
D)  show interface brief

Question 10

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?

Accepted Answer

A)  The interface IP addresses of both routers are on the same subnet. 
B)  Both routers use the same Process ID. 
C)  Both routers' interfaces use the same OSPF Dead interval. 
D)  The routers are both using the same OSPF router ID. 
A)  The interface IP addresses of both routers are on the same subnet. 
B)  Both routers use the same Process ID. 
C)  Both routers' interfaces use the same OSPF Dead interval. 
D)  The routers are both using the same OSPF router ID.

Question 11

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

Accepted Answer

A)  OSPF router ID 
B)  OSPF cost 
C)  OSPF network type 
D)  OSPF interface priority 
A)  OSPF router ID 
B)  OSPF cost 
C)  OSPF network type 
D)  OSPF interface priority

Question 12

Review the output from the show ip ospf interface brief command shown below. According to this output, MyRouter has how many total neighbors?

$\text {MyRouter\# show ip ospf interface brief}$
$\begin{array}{cccccccc} 
\text {Interface }& \text {PID }& \text {Area} & \text {IP Address/Mask} &\text { Cost} &\text { State }&\text { Nbrs} & \text {F/C} \
\text {Gi0/1} & 1 & 0 &  192.168 .1 .4 / 24  & 1 && \text {DROTH} & 0 / 1 
\end{array}$

Accepted Answer

A)  1 
B)  24 
C)  0 
D)  4 
A)  1 
B)  24 
C)  0 
D)  4

Question 13

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?

$\text {MyRouter\# show ip ospf interface brief}$
$\begin{array}{cccccccc} 
\text {Interface }& \text {PID }& \text {Area} & \text {IP Address/Mask} &\text { Cost} &\text { State }&\text { Nbrs} & \text {F/C} \
\text {Gi0/1} & 1 & 0 &  192.168 .1 .4 / 24  & 1 && \text {DROTH} & 0 / 1 
\end{array}$

Accepted Answer

A)  1 
B)  24 
C)  0 
D)  5 
A)  1 
B)  24 
C)  0 
D)  5

Question 14

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?

Accepted Answer

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

Question 15

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?

Accepted Answer

A)  The router empties its LSDB but the OSPF neighbor relationships remain active. 
B)  The router holds the entire OSPF configuration but stops all OSPF activities (routes, LSDB, neighbors). 
C)  The router leaves OSPF neighbors open but no longer will accept new OSPF neighbors. 
D)  The router empties its IP routing table of all OSPF routes but keeps its LSDB intact. 
A)  The router empties its LSDB but the OSPF neighbor relationships remain active. 
B)  The router holds the entire OSPF configuration but stops all OSPF activities (routes, LSDB, neighbors). 
C)  The router leaves OSPF neighbors open but no longer will accept new OSPF neighbors. 
D)  The router empties its IP routing table of all OSPF routes but keeps its LSDB intact.

Exam 21: OSPF Network Types and Neighbors

Routers often have a default MTU size of _____ ?

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?

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

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

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

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

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

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

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?

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?

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

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 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?

Introduction to TCP/IP Networking

Fundamentals of Ethernet Lans

Fundamentals of Wans and IP Routing

Using the Command-Line Interface

Analyzing Ethernet Lan Switching

Configuring Basic Switch Management

Configuring and Verifying Switch Interfaces

Implementing Ethernet Virtual Lans

Spanning Tree Protocol Concepts

RSTP and Etherchannel Configuration

Perspectives on IPV4 Subnetting

Analyzing Classful IPV4 Networks

Analyzing Subnet Masks

Analyzing Existing Subnets

Operating Cisco Routers

Configuring IPV4 Addresses and Static Routes

IP Routing in the Lan

Troubleshooting IPV4 Routing

Understanding OSPF Concepts

Implementing OSPF

Fundamentals of IP Version 6

Ipv6 Addressing and Subnetting

Implementing IPV6 Addressing on Routers

Implementing IPV6 Routing

Fundamentals of Wireless Networks

Analyzing Cisco Wireless Architectures

Securing Wireless Networks

Building a Wireless Lan

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