Interconnecting Cisco Networking Devices Part 1 v3.0 (ICND1)

 

QUESTION 91

Refer to the exhibit. A network associate has configured OSPF with the command:

 

City(config-router)# network 192.168.12.64 0.0.0.63 area 0

 

After completing the configuration, the associate discovers that not all the interfaces are participating in OSPF. Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration statement? (Choose three.)

 

clip_image002

 

A.

FastEthernet0 /0

B.

FastEthernet0 /1

C.

Serial0/0

D.

Serial0/1.102

E.

Serial0/1.103

F.

Serial0/1.104

 

Correct Answer: BCD

Explanation:

The “network 192.168.12.64 0.0.0.63 equals to network 192.168.12.64/26. This network has:

+ Increment: 64 (/26= 1111 1111.1111 1111.1111 1111.1100 0000)

+ Network address: 192.168.12.64

+ Broadcast address: 192.168.12.127

Therefore all interface in the range of this network will join OSPF.

 

 

QUESTION 92

An administrator must assign static IP addresses to the servers in a network. For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. Which of the following should be entered into the IP properties box for the sales server?

 

A.

IP address: 192.168.20.14

Subnet Mask: 255.255.255.248

Default Gateway: 192.168.20.9

B.

IP address: 192.168.20.254

Subnet Mask: 255.255.255.0

Default Gateway: 192.168.20.1

C.

IP address: 192.168.20.30

Subnet Mask: 255.255.255.248

Default Gateway: 192.168.20.25

D.

IP address: 192.168.20.30

Subnet Mask: 255.255.255.240

Default Gateway: 192.168.20.17

E.


IP address: 192.168.20.30

Subnet Mask: 255.255.255.240

Default Gateway: 192.168.20.25

 

Correct Answer: C

Explanation:

With network 192.168.20.24/29 we have:

Increment: 8 (/29 = 255.255.255.248 = 11111000 for the last octet)

Network address: 192.168.20.24 (because 24 = 8 * 3)

Broadcast address: 192.168.20.31 (because 31 = 24 + 8 – 1)

Therefore the first usable IP address is 192.168.20.25 (assigned to the router) and the last usable IP address is 192.168.20.30 (assigned to the sales server). The IP address of the router is also the default gateway of the sales server.

 

 

QUESTION 93

Refer to the exhibit. Which command would you use to configure a static route on Router1 to network 192.168.202.0/24 with a nondefault administrative distance?

 

clip_image004

 

A.

router1(config)#ip route 1 192.168.201.1 255.255.255.0 192.168.201.2

B.

router1(config)#ip route 192.168.202.0 255.255.255.0 192.168.201.2 1

C.

router1(config)#ip route 5 192.168.202.0 255.255.255.0 192.168.201.2

D.

router1(config)#ip route 192.168.202.0 255.255.255.0 192.168.201.2 5

 

Correct Answer: D

Explanation:

The default AD for a static route is 1. To change this, configure a different value to be used as the AD at the very end of the “ip route” statement.

 

 

QUESTION 94

Which two statements describe characteristics of IPv6 unicast addressing? (Choose two.)

 

A.

Global addresses start with 2000::/3.

B.

Link-local addresses start with FE00:/12.

C.

Link-local addresses start with FF00::/10.

D.

There is only one loopback address and it is ::1.

E.

If a global address is assigned to an interface, then that is the only allowable address for the interface.

 

Correct Answer: AD

 

 

QUESTION 95

Scenario

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?

 

clip_image006

clip_image007

clip_image008

clip_image009

clip_image010

clip_image011

clip_image012

clip_image013

 

A.

R1 ethernetO/1 is shutdown. Configure no shutdown command.

B.

R1 ethernetO/1 configured with a non-default OSPF hello interval of 25: configure no ip ospf hello-interval 25

C.

R2 ethernetO/1 and R3 ethernetO/O are configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25

D.

Enable OSPF for R1 ethernetO/1; configure ip ospf 1 area 0 command under ethernetO/1

 

Correct Answer: B

Explanation:

Looking at the configuration of R1, we see that R1 is configured with a hello interval of 25 on interface Ethernet 0/1 while R2 is left with the default of 10 (not configured).

 

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QUESTION 96

Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two)

 

A.

It is locally significant.

B.

It is globally significant.

C.

It is needed to identify a unique instance of an OSPF database.

D.

It is an optional parameter required only if multiple OSPF processes are running on the router.

E.

All routers in the same OSPF area must have the same process ID if they are to exchange routing information.

 

Correct Answer: AC

Explanation:

https://learningnetwork.cisco.com/thread/6248

They are locally significant only, and have no bearing on the structure of any OSPF packet or LSA update. So you can have a separate process-id on every single router in your network if you so desire.

 

 

QUESTION 97

The command ip route 192.168.100.160 255.255.255.224 192.168.10.2 was issued on a router. No routing protocols or other static routes are configured on the router. Which statement is true about this command?

 

A.

The interface with IP address 192.168.10.2 is on this router.

B.

The command sets a gateway of last resort for the router.

C.

Packets that are destined for host 192.168.100.160 will be sent to 192.168.10.2.

D.

The command creates a static route for all IP traffic with the source address 192.168.100.160.

 

Correct Answer: C

Explanation:

With 160 it’s actually network address of /27 so any address within the range of .160-.191 network will be sent to 192.168.10.2.

 

 

QUESTION 98

What are two benefits of using a single OSPF area network design? (Choose two.)

 

A.

It is less CPU intensive for routers in the single area.

B.

It reduces the types of LSAs that are generated.

C.

It removes the need for virtual links.

D.

It increases LSA response times.

E.

It reduces the number of required OSPF neighbor adjacencies.

 

Correct Answer: BC

Explanation:

OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement).

The link types are as follows:

 

clip_image017LSA Type 1: Router LSA

clip_image017[1]LSA Type 2: Network LSA

clip_image017[2]LSA Type 3: Summary LSA

clip_image017[3]LSA Type 4: Summary ASBR LSA

clip_image017[4]LSA Type 5: Autonomous system external LSA

clip_image017[5]LSA Type 6: Multicast OSPF LSA

clip_image017[6]LSA Type 7: Not-so-stubby area LSA

clip_image017[7]LSA Type 8: External attribute LSA for BGP

 

If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router.

 

All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non- backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed.

 

 

QUESTION 99

What is the OSPF default frequency, in seconds, at which a Cisco router sends hello packets on a multi-access network?

 

A.

10

B.

40

C.

30

D.

20

 

Correct Answer: A

Explanation:

On broadcast multiacess and point-to-point links, the default is 10 seconds. On NBMA, the default is 30 seconds.

 

 

QUESTION 100

The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router. Which routers are likely to have been elected as DR? (Choose two.)

 

clip_image019

 

A.

Corp-1

B.

Corp-2

C.

Corp-3

D.

Corp-4

E.

Branch-1

F.

Branch-2

 

Correct Answer: DF

Explanation:

There are 2 segments on the topology above which are separated by Corp-3 router. Each segment will have a DR so we have 2 DRs.

To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below:

 

+ The highest IP address assigned to a loopback (logical) interface.

+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.

 

In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40) & Branch-2 (10.2.20.20) have highest “active” IP addresses so they will become DRs.

 

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