[Free] 2018(Jan) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 61-70

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

Question No: 61 – (Topic 3)

Which commands are required to properly configure a router to run OSPF and to add network to OSPF area 0? (Choose two.)

  1. Router(config)# router ospf 0

  2. Router(config)# router ospf 1

  3. Router(config)# router ospf area 0

  4. Router(config-router)# network 0

  5. Router(config-router)# network area 0

  6. Router(config-router)# network area 0

Answer: B,E


In the router ospf command, the ranges from 1 to 65535 so o is an invalid number -gt; but To configure OSPF, we need a wildcard in the “network” statement, not a subnet mask. We also need to assgin an area to this process.

Question No: 62 – (Topic 3)

Which of the following IP addresses are valid Class B host addresses if a default Class B mask is in use? (Choose two.)






Answer: B,E Explanation:

The IP addresses and are both valid Class B addresses when a default mask is in use.

The Class B default mask is and the range of valid addresses is

The IP address is a Class A address. The Class A default mask is and the range of valid addresses is –, with the exception of the range –, which is reserved and cannot be assigned.

The IP address is a Class C address. The Class C default mask is and the range of valid addresses is –

The IP address is a Class A address, but it comes from a reserved portion that cannot be assigned.

The range – is used for diagnostics, and although any address in the range will work as a diagnostic address, is known as the loopback address. If you can ping this address, or any address in the – range, then the NIC is working and TCP/IP is installed. The Class A default mask is and the range of valid addresses is –, with the exception of the range –, which is reserved and cannot be assigned.

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Question No: 63 – (Topic 3)

What is the subnet address of







Answer: C Explanation:

Converting to binary format it comes to 11111111.11111111.11111100.00000000 or Starting with and having increment of 4 we get.

Question No: 64 – (Topic 3)

A network administrator is trying to add a new router into an established OSPF network. The networks attached to the new router do not appear in the routing tables of the other OSPF routers. Given the information in the partial configuration shown below, what configuration error is causing this problem?

Router(config)# router ospf 1

Router(config-router)# network area 0

  1. The process id is configured improperly.

  2. The OSPF area is configured improperly.

  3. The network wildcard mask is configured improperly.

  4. The network number is configured improperly.

  5. The AS is configured improperly.

  6. The network subnet mask is configured improperly.

Answer: C Explanation:

When configuring OSPF, the mask used for the network statement is a wildcard mask similar to an access list. In this specific example, the correct syntax would have been “network area 0.”

Question No: 65 – (Topic 3)

To allow or prevent load balancing to network, which of the following commands could be used in R2? (Choose two.)

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  1. R2(config-if)#clock rate

  2. R2(config-if)#bandwidth

  3. R2(config-if)#ip ospf cost

  4. R2(config-if)#ip ospf priority

  5. R2(config-router)#distance ospf

Answer: B,C Explanation:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.sht ml#t6

The cost (also called metric) of an interface in OSPF is an indication of the overhead required to send packets across a certain interface. The cost of an interface is inversely proportional to the bandwidth of that interface. A higher bandwidth indicates a lower cost. There is more overhead (higher cost) and time delays involved in crossing a 56k serial line than crossing a 10M Ethernet line. The formula used to calculate the cost is:

Cost = 10000 0000/bandwidth in bps

For example, it will cost 10 EXP8/10 EXP7 = 10 to cross a 10M Ethernet line and will cost 10 EXP8/1544000 =64 to cross a T1 line.

By default, the cost of an interface is calculated based on the bandwidth; you can force the cost of an interface with the ip ospf cost lt;valuegt; interface subconfiguration mode command.

Question No: 66 – (Topic 3)

Which IP address is a private address?






Answer: C

Question No: 67 – (Topic 3)

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

  1. The interface with IP address is on this router.

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

  3. Packets that are destined for host will be sent to

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

Answer: C Explanation:

With 160 it#39;s actually network address of /27 so any address within the range of .160-.191 network will be sent to

Question No: 68 – (Topic 3)

A network administrator is troubleshooting the OSPF configuration of routers R1 and R2. The routers cannot establish an adjacency relationship on their common Ethernet link.

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The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2. Based on the information in the graphic, what is the cause of this problem?

  1. The OSPF area is not configured properly.

  2. The priority on R1 should be set higher.

  3. The cost on R1 should be set higher.

  4. The hello and dead timers are not configured properly.

  5. A backup designated router needs to be added to the network.

  6. The OSPF process ID numbers must match.

Answer: D Explanation:

In OSPF, the hello and dead intervals must match and here we can see the hello interval is set to 5 on R1 and 10 on R2. The dead interval is also set to 20 on R1 but it is 40 on R2.

Question No: 69 – (Topic 3)

Which characteristics are representative of a link-state routing protocol? (Choose three.)

  1. provides common view of entire topology

  2. exchanges routing tables with neighbors

  3. calculates shortest path

  4. utilizes event-triggered updates

  5. utilizes frequent periodic updates

Answer: A,C,D Explanation:

Each of routers running link-state routing protocol learns paths to all the destinations in its “area” so we can say although it is a bit unclear.

Link-state routing protocols generate routing updates only (not the whole routing table) when a change occurs in the network topology so

Link-state routing protocol like OSPF uses Dijkstra algorithm to calculate the shortest path –

gt; .

Unlike Distance vector routing protocol (which utilizes frequent periodic updates), link-state routing protocol utilizes event-triggered updates (only sends update when a change occurs)


Question No: 70 – (Topic 3)

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

  1. 10

  2. 40

  3. 30

  4. 20

Answer: A Explanation:

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

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