[Free] 2017(July) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 101-110

2017 July Cisco Official New Released 100-105
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Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)

Question No: 101 – (Topic 3)

Refer to the exhibit.


Which default gateway address should be assigned to HostA?







Answer: B Explanation:

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

Question No: 102 – (Topic 3)

Which command enables IPv6 forwarding on a Cisco router?

  1. ipv6 host

  2. ipv6 unicast-routing

  3. ipv6 local

  4. ipv6 neighbor

Answer: B Explanation:

Enabling IPv6 on Cisco IOS Software Technology http://www.ciscopress.com/articles/article.asp?p=31948amp;seqNum=4

The first step of enabling IPv6 on a Cisco router is the activation of IPv6 traffic forwarding to forward unicast IPv6 packets between network interfaces. By default, IPv6 traffic forwarding is disabled on Cisco routers.

The ipv6 unicast-routing command is used to enable the forwarding of IPv6 packets between interfaces on the router. The syntax for this command is as follows: Router(config)#ipv6 unicast-routing The ipv6 unicast-routing command is enabled on a global basis.

Question No: 103 – (Topic 3)

The network manager has requested a 300-workstation expansion of the network. The workstations are to be installed in a single broadcast domain, but each workstation must have its own collision domain. The expansion is to be as cost-effective as possible while still meeting the requirements.

Which three items will adequately fulfill the request? (Choose three).

  1. One IP subnet with a mask of

  2. Two IP subnets with a mask of

  3. Seven 48-port hubs

  4. Seven 48-port switches

  5. One router interface

  6. Seven router interfaces

Answer: A,D,E Explanation:

To support 300 workstations in a single broadcast domain, we need to use a subnet mask which supports 512 hosts = 29-gt; /23 or in decimal form -gt; A is correct.

If we use 48-port switches we need 300/48 = 6.25 -gt; seven 48-port switches are enough because we also need trunking between them -gt; D is correct.

We only need one router interface and it is connected with one of seven switches -gt; E is correct.

Question No: 104 – (Topic 3)


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?

  1. There is an area ID mismatch.

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

  3. There is an OSPF hello and dead interval mismatch.

  4. The R3 router ID is configured on R6.

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.


Question No: 105 – (Topic 3)

What is the default administrative distance of the OSPF routing protocol?

  1. 90 B. 100 C. 110 D. 120 E. 130 F. 170

    Answer: C Explanation:

    Default Distance Value Table

    This table lists the administrative distance default values of the protocols that Cisco supports:


    If the administrative distance is 255, the router does not believe the source of that route and does not install the route in the routing table.

    Question No: 106 – (Topic 3)

    Which two statements describe the IP address (Choose two.)

    A. The subnet address is

  2. The lowest host address in the subnet is

  3. The last valid host address in the subnet is

  4. The broadcast address of the subnet is

  5. The network is not subnetted.

Answer: B,D Explanation:

The mask (/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 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

Question No: 107 – (Topic 3)

Which address are OSPF hello packets addressed to on point-to-point networks?






Answer: A Explanation:

Why does the show ip ospf neighbor Command Reveal Neighbors in the Init State? http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f11.shtml

OSPF hello packets have a destination address of (the all ospf routers multicast address).

Question No: 108 – (Topic 3)

An administrator is in the process of changing the configuration of a router. What command

will allow the administrator to check the changes that have been made prior to saving the new configuration?

  1. Router# show startup-config

  2. Router# show current-config

  3. Router# show running-config

  4. Router# show memory

  5. Router# show flash

  6. Router# show processes

Answer: C Explanation:

This command followed by the appropriate parameter will show the running config hence the admin will be able to see what changes have been made, and then they can be saved.

Question No: 109 – (Topic 3)

Which three statements are correct about RIP version 2? (Choose three)

  1. It uses broadcast for its routing updates.

  2. It supports authentication.

  3. It is a classless routing protocol.

  4. It has a lower default administrative distance then RIP version 1.

  5. It has the same maximum hop count as RIP version 1.

  6. It does not send the subnet mask any updates.

Answer: B,C,E Explanation:

A and E are correct according to the theory of RIP.

RIP version 1 updates are broadcasts, and RIP version 2 updates are multicast to -gt; B is not correct.

RIP v1 is a classful routing protocol but RIP v2 is a classless routing protocol -gt; C is correct.

RIPv1 and RIPv2 have the same default administrative distance of 120 -gt; D is not correct. RIPv2 is a classless routing protocol so it does send the subnet mask in updates -gt; F is not correct.

Question No: 110 – (Topic 3)

Refer to the exhibit.


Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?

  1. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.

  2. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.

  3. Any packet destined for a network that is not directly connected to router R1 will be dropped.

  4. The networks directly connected to router R2 will not be able to communicate with the,, and subnetworks.

  5. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1.

Answer: B Explanation:

First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (,, so the packets destined for these networks will not be affected by the default route.

The default route configured on R1 鈥渋p route serial0/0 will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn’t drop anything. These routes are declared in R1 and the question says that 鈥淥SPF has been correctly configured on router R2, so network directly connected to router R2 can communicate with those three subnetworks.

As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur.

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