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

 

QUESTION 81

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

 

A.

2

B.

8

C.

16

D.

unlimited

 

Correct Answer: B

Explanation:

Maximum-paths (OSPF)

To control the maximum number of parallel routes that Open Shortest Path First (OSPF) can support, use the maximum-paths command.

Syntax Description

 

maximum

Maximum number of parallel routes that OSPF can install in a routing table. The range is from 1 to 16 routes.

 

Command Default

8 paths

 

 

QUESTION 82

Which command can you use to manually assign a static IPV6 address to a router interface?

 

A.

ipv6 address PREFIX_1::1/64

B.

ipv6 autoconfig 2001:db8:2222:7272::72/64

C.

ipv6 autoconfig

D.

ipv6 address 2001:db8:2222:7272::72/64

 

Correct Answer: D

Explanation:

An example of configuring IPv6 on an interface is shown below:

Router(config)# interface fastethernet 0/1

Router(config-if)# ipv6 address 3000::2222:1/64

 

 

QUESTION 83

Which two of these statements are true of IPv6 address representation? (Choose two.)

 

A.

There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

B.

A single interface may be assigned multiple IPv6 addresses of any type.

C.

Every IPv6 interface contains at least one loopback address.

D.

The first 64 bits represent the dynamically created interface ID.

E.

Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

 

Correct Answer: BC

Explanation:

A single interface may be assigned multiple addresses of any type (unicast, anycast, multicast).

Every IPv6-enabled interface must contain at least one loopback and one link-local address.

Optionally, every interface can have multiple unique local and global addresses. IPv6 host addresses can be assigned in multiple ways:

Static configuration

Stateless autoconfiguration

DHCPv6

 

When IPv6 is used over Ethernet networks, the Ethernet MAC address can be used to generate the 64-bit interface ID for the host. This is called the EUI-64 address. Since MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits required.

 

Reference: http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf

 

 

QUESTION 84

ROUTER# show ip route

 

192.168.12.0/24 is variably subnetted, 9 subnets, 3 masks

 

C 192.168.12.64 /28 is directly connected, Loopback1

 

C 192.168.12.32 /28 is directly connected, Ethernet0

 

C 192.168.12.48 /28 is directly connected, Loopback0

 

O 192.168.12.236 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0

 

C 192.168.12.232 /30 is directly connected, Serial0

 

O 192.168.12.245 /30 [110/782] via 192.168.12.233, 00:35:36, Serial0

 

O 192.168.12.240 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0

 

O 192.168.12.253 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0

 

O 192.168.12.249 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0

 

O 192.168.12.240/30 [110/128] via 192.168.12.233, 00:35:36, Serial 0

 

To what does the 128 refer to in the router output above?

 

A.

OSPF cost

B.

OSPF priority

C.

OSPF hop count

D.

OSPF ID number

E.

OSPF administrative distance

 

Correct Answer:
A

Explanation:

The first parameter is the Administrative Distance of OSPF (110) while the second parameter is the cost of OSPF.

 

QUESTION 85

Refer to the exhibit. PC1 pings PC2. What three things will CORE router do with the data that is received from PC1? (Choose three.)

 

clip_image002

 

A.

The data frames will be forwarded out interface FastEthernet0/1 of CORE router.

B.

The data frames will be forwarded out interface FastEthernet1/0 of CORE router.

C.

CORE router will replace the destination IP address of the packets with the IP address of PC2.

D.

CORE router will replace the MAC address of PC2 in the destination MAC address of the frames.

E.

CORE router will put the IP address of the forwarding FastEthernet interface in the place of the source IP address in the packets.

F.

CORE router will put the MAC address of the forwarding FastEthernet interface in the place of the source MAC address.

 

Correct Answer: BDF

Explanation:

The router will forward the frames out the interface toward the destination – B is correct.

Since the router will has the end station already in it’s MAC table as see by the “show arp” command, it will replace the destination MAC address to that of PC2 – D is correct.

The router will then replace the source IP address to 172.16.40.1 – F is correct.

 

 

QUESTION 86

Which statements describe the routing protocol OSPF? (Choose three.)

 

A.

It supports VLSM.

B.

It is used to route between autonomous systems.

C.

It confines network instability to one area of the network.

D.

It increases routing overhead on the network.

E.

It allows extensive control of routing updates.

F.

It is simpler to configure than RIP v2.

 

Correct Answer: ACE

Explanation:

Routing overhead is the amount of information needed to describe the changes in a dynamic network topology.

All routers in an OSPF area have identical copies of the topology database and the topology database of one area is hidden from the rest of the areas to reduce routing
overhead because fewer routing updates are sent and smaller routing trees are computed and maintained (allow extensive control of routing updates and confine network instability to one area of the network).

 

 

QUESTION 87

Which parameter or parameters are used to calculate OSPF cost in Cisco routers?

 

A.

Bandwidth

B.

Bandwidth and Delay

C.

Bandwidth, Delay, and MTU

D.

Bandwidth, MTU, Reliability, Delay, and Load

 

Correct Answer: A

Explanation:

The well-known formula to calculate OSPF cost is Cost = 108/ Bandwidth

 

 

QUESTION 88

Refer to the exhibit. Which default gateway address should be assigned to HostA?

 

clip_image004

 

A.

192.168.1.1

B.

192.168.1.65

C.

192.168.1.66

D.

192.168.1.129

E.

10.1.1.1

F.

10.1.1.2

 

Correct Answer: B

Explanation:

The default gateway will be the IP address of the router that it connects to, not the switch.

 

QUESTION 89

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. An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem?

 

clip_image006

clip_image007

clip_image008

clip_image009

clip_image010

clip_image011

clip_image012

clip_image013

 

A.

There is an area ID mismatch.

B.

There is a PPP authentication issue; the username is not configured on R3 and R6.

C.

There is an OSPF hello and dead interval mismatch.

D.


The R3 router ID is configured on R6.

 

Correct Answer: D

Explanation:

Using the show running-config command we see that R6 has been incorrectly configured with the same router ID as R3 under the router OSPF process.

 

clip_image015

 

 

QUESTION 90

Which two statements describe the IP address 10.16.3.65/23? (Choose two.)

 

A.

The subnet address is 10.16.3.0 255.255.254.0.

B.

The lowest host address in the subnet is 10.16.2.1 255.255.254.0.

C.

The last valid host address in the subnet is 10.16.2.254 255.255.254.0

D.

The broadcast address of the subnet is 10.16.3.255 255.255.254.0.

E.

The network is not subnetted.

 

Correct Answer: BD

Explanation:

The mask 255.255.254.0 (/23) used with a Class A address means that there are 15 subnet bits and 9 host bits. The block size in the third octet is 2 (256 – 254). So this makes the subnets in 0, 2, 4, 6, etc., all the way to 254. The host 10.16.3.65 is in the 2.0 subnet. The next subnet is 4.0, so the broadcast address for the 2.0 subnet is 3.255. The valid host addresses are 2.1 through 3.254

 

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