[Free] 2017(July) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 51-60

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

Question No: 51 – (Topic 2)

Refer to the exhibit.

image

image

What two things can the technician determine by successfully pinging from this computer to the IP address 172.16.236.1? (Choose two)

  1. The network card on the computer is functioning correctly.

  2. The default static route on the gateway router is correctly configured.

  3. The correct default gateway IP address is configured on the computer.

  4. The device with the IP address 172.16.236.1 is reachable over the network.

  5. The default gateway at 172.16.236.1 is able to forward packets to the internet.

Answer: A,D Explanation:

The source and destination addresses are on the same network therefore, a default gateway is not necessary for communication between these two addresses.

Question No: 52 – (Topic 2)

Which address type does a switch use to make selective forwarding decisions?

  1. Source IP address

  2. Destination IP address

  3. Source and destination IP address

  4. Source MAC address

  5. Destination MAC address

Answer: E Explanation:

Switches analyze the destination MAC to make its forwarding decision since it is a layer 2 device. Routers use the destination IP address to make forwarding decisions.

Topic 3, Routing Fundamentals

Question No: 53 – (Topic 3)

What is the network address for the host with IP address 192.168.23.61/28?

A. 192.168.23.0

B. 192.168.23.32

C. 192.168.23.48

D. 192.168.23.56

E. 192.168.23.60

Answer: C Explanation:

Convert bit-length prefix to quad-dotted decimal representation, then from it find the number of bits used for subnetting you can find previously calculated number of subnets by separating subnets each having value of last bit used for subnet masking Find that your IP address is in which subnet, that subnet#39;s first address is network address and last address is broadcast address.

Based on above steps the answer is option C

Question No: 54 – (Topic 3)

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

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

  2. It reduces the types of LSAs that are generated.

  3. It removes the need for virtual links.

  4. It increases LSA response times.

  5. It reduces the number of required OSPF neighbor adjacencies.

Answer: B,C Explanation:

OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement). The link types are as follows:

->LSA Type 1: Router LSA

->LSA Type 2: Network LSA

->LSA Type 3: Summary LSA

->LSA Type 4: Summary ASBR LSA

->LSA Type 5: Autonomous system external LSA

->LSA Type 6: Multicast OSPF LSA

->LSA Type 7: Not-so-stubby area LSA

->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 No: 55 – (Topic 3)

Given a Class C IP address subnetted with a /30 subnet mask, how many valid host IP addresses are available on each of the subnets?

  1. 1

  2. 2

  3. 4

  4. 8 E. 252 F. 254

Answer: B Explanation:

/30 CIDR corresponds to mask 55.255.255.252 whose binary is 11111100 which means 6 subnet bits and 2 host bits which means 62 subnets and 2 hosts per subnet.

Question No: 56 – (Topic 3)

Refer to the exhibit.

image

If the router Cisco returns the given output and has not had its router ID set manually, what value will OSPF use as its router ID?

A. 192.168.1.1

B. 172.16.1.1

C. 1.1.1.1

D. 2.2.2.2

Answer: D Explanation:

If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of a logical interface (loopback interface) or the highest IP address of an active interface. If more than one loopback interfaces are configured, the router will compare the IP addresses of each of the interfaces and choose the highest IP address from the loopbacks.

Question No: 57 – (Topic 3)

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

  1. Global addresses start with 2000::/3.

  2. Link-local addresses start with FE00:/12.

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

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

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

Answer: A,D

Question No: 58 – (Topic 3)

Refer to the exhibit.

image

The enterprise has decided to use the network address 172.16.0.0. The network administrator needs to design a classful addressing scheme to accommodate the three subnets, with 30, 40, and 50 hosts, as shown. What subnet mask would accommodate this network?

A. 255.255.255.192

B. 255.255.255.224

C. 255.255.255.240

D. 255.255.255.248

E. 255.255.255.252

Answer: A Explanation:

Subnet mask A i.e. 255.255.255.192 with CIDR of /26 which means 64 hosts per subnet which are sufficient to accommodate even the largest subnet of 50 hosts.

image

Question No: 59 – (Topic 3)

Refer to the graphic.

image

R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.)

  1. All of the routers need to be configured for backbone Area 1.

  2. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.

  3. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.

  4. The hello and dead interval timers are not set to the same values on R1 and R3.

  5. EIGRP is also configured on these routers with a lower administrative distance.

  6. R1 and R3 are configured in different areas.

    Answer: D,F Explanation:

    This question is to examine the conditions for OSPF to create neighborhood.

    So as to make the two routers become neighbors, each router must be matched with the following items:

    1. The area ID and its types;

    2. Hello and failure time interval timer;

    3. OSPF Password (Optional);

      Question No: 60 – (Topic 3)

      Refer to the exhibit.

      image

      When running OSPF, what would cause router A not to form an adjacency with router B?

      1. The loopback addresses are on different subnets.

      2. The values of the dead timers on the routers are different.

      3. Route summarization is enabled on both routers.

      4. The process identifier on router A is different than the process identifier on router B.

Answer: B Explanation:

To form an adjacency (become neighbor), router A amp; B must have the same Hello interval, Dead interval and AREA numbers

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