[Free] 2017(July) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 91-100

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

Question No: 91 – (Topic 3)

After the network has converged, what type of messaging, if any, occurs between R3 and R4?


  1. No messages are exchanged

  2. Hellos are sent every 10 seconds.

  3. The full database from each router is sent every 30 seconds.

  4. The routing table from each router is sent every 60 seconds.

Answer: B Explanation:

HELLO messages are used to maintain adjacent neighbors so even when the network is converged, hellos are still exchanged. On broadcast and point-to-point links, the default is 10 seconds, on NBMA the default is 30 seconds.

Although OSPF is a link-state protocol the full database from each router is sent every 30 minutes (not seconds) therefore, C and D are not correct.

Question No: 92 – (Topic 3)

Which one of the following IP addresses is the last valid host in the subnet using mask






Answer: B Explanation:

With the 224 there are 8 networks with increments of 32

One of these is 32 33 62 63 where 63 is broadcast so 62 is last valid host out of given choices.

Question No: 93 – (Topic 3)

Refer to the exhibit.


Which two statements are correct? (Choose two.)

  1. This is a default route.

  2. Adding the subnet mask is optional for the ip route command.

  3. This will allow any host on the network to reach all known destinations beyond RouterA.

  4. This command is incorrect, it needs to specify the interface, such as s0/0/0 rather than an IP address.

  5. The same command needs to be entered on RouterA so that hosts on the network can reach network

Answer: A,C Explanation:

This is obviously the default route which is set between the routers and since it is entered

in such a manner that it ensures connectivity between the stub network and any host lying beyond RouterA.

Question No: 94 – (Topic 3)

What command sequence will configure a router to run OSPF and add network

/24 to area 0?

  1. router ospf area 0

    network area 0

  2. router ospf


  3. router ospf 1

    network area 0

  4. router ospf area 0

    network area 0

  5. router ospf

    network area 0

  6. router ospf 1


Answer: C Explanation:


1.enable 2.configureterminal 3.router ospfprocess-id

4.networkip-addresswildcard-maskareaarea-id 5.end


Command or Action Purpose

Step 1 enable


Devicegt; enable

Enables privileged EXEC mode.


Step 2

Enter your password if prompted.

configure terminal


Device# configure terminal Enters global configuration mode.

Step 3

router ospf process-id


Device(config)# router ospf 109

Enables OSPF routing and enters router configuration mode.

Step 4

network ip-address wildcard-mask area area-id


Device(config-router)# network area 0

Defines an interface on which OSPF runs and defines the area ID for that interface.

Step 5 end


Device(config-router)# end

Exits router configuration mode and returns to privileged EXEC mode.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/12- 4t/iro-12-4t-book/iro-cfg.html#GUID-588D1301-F63C-4DAC-BF1C-C3735EB13673

Question No: 95 – (Topic 3)

OSPF is configured using default classful addressing. With all routers and interfaces operational, how many networks will be in the routing table of R1 that are indicated to be learned by OSPF?


  1. 2

  2. 3

  3. 4

  4. 5

  5. 6

  6. 7

Answer: C Explanation:

Although OSPF is configured using default classful addressing but OSPF is a link-state routing protocol so it will always send the subnet mask of each network in their advertised routes. Therefore R1 will learn the the complete subnets. Four networks list below will be in the routing table of R1:

Note: Other networks will be learned as 鈥淒irectly connected鈥?networks (marked with letter 鈥淐鈥?

Question No: 96 – (Topic 3)

Which two of these functions do routers perform on packets? (Choose two.)

  1. Examine the Layer 2 headers of inbound packets and use that information to determine the next hops for the packets

  2. Update the Layer 2 headers of outbound packets with the MAC addresses of the next


  3. Examine the Layer 3 headers of inbound packets and use that information to determine the next hops for the packets

  4. Examine the Layer 3 headers of inbound packets and use that information to determine the complete paths along which the packets will be routed to their ultimate destinations

  5. Update the Layer 3 headers of outbound packets so that the packets are properly directed to valid next hops

  6. Update the Layer 3 headers of outbound packets so that the packets are properly directed to their ultimate destinations

Answer: B,C Explanation:

This is the basic function of the router to receive incoming packets and then forward them to their required destination. This is done by reading layer 3 headers of inbound packets and update the info to layer 2 for further hopping.

Question No: 97 – (Topic 3)

Why do large OSPF networks use a hierarchical design? (Choose three.)

  1. to decrease latency by increasing bandwidth

  2. to reduce routing overhead

  3. to speed up convergence

  4. to confine network instability to single areas of the network

  5. to reduce the complexity of router configuration

  6. to lower costs by replacing routers with distribution layer switches

Answer: B,C,D Explanation:

OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas.

The hierarchical approach is used to achieve the following:

->Rapid convergence because of link and/or switch failures

->Deterministic traffic recovery

->Scalable and manageable routing hierarchy, reduced routing overhead.

Question No: 98 – (Topic 3)

Refer to the exhibit.


If CDP is enabled on all devices and interfaces, which devices will appear in the output of a show cdp neighbors command issued from R2?

  1. R2 and R3

  2. R1 and R3

  3. R3 and S2

  4. R1, S1, S2, and R3

  5. R1, S1, S2, R3, and S3

Answer: C Explanation:

A Cisco device enabled with CDP sends out periodic interface updates to a multicast address in order to make itself known to neighbors. Since it is a layer two protocol, these packets are not routed. So the devices detected would be immediate connected neighbors.

Question No: 99 – (Topic 3)

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

  1. Bandwidth

  2. Bandwidth and Delay

  3. Bandwidth, Delay, and MTU

  4. Bandwidth, MTU, Reliability, Delay, and Load

Answer: A Explanation:

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

Question No: 100 – (Topic 3)

Refer to the exhibit.


Which command would you use to configure a static route on Router1 to network with a nondefault administrative distance?

A. router1(config)#ip route 1

B. router1(config)#ip route 1

C. router1(config)#ip route 5

D. router1(config)#ip route 5

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 鈥渋p route鈥?statement.

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