[Free] 2017(Oct) Dumps4cert Testinsides Cisco 200-105 Dumps with VCE and PDF Download 71-80

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Interconnecting Cisco Networking Devices Part 2 (ICND2 v3.0)

Question No: 71 – (Topic 2)

Refer to the exhibit

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Which switch provides the spanning-tree designated port role for the network segment that services the printers?

  1. Switch1

  2. Switch2

  3. Switch3

  4. Switch4

Answer: C Explanation:

First, the question asks what switch services the printers, so it can be Switch 3 or Switch 4 which is connected directly to the Printers.

Designated port is a port that is in the forwarding state. All ports of the root bridge are designated ports.

Switch 3 and Switch 4 has same priority so it will see on lowest MAC address and here switch 3 has lowest MAC address. So switch 3 segment will play a Designated port role. By comparing the MAC address of Switch 3 and Switch 4 we found that the MAC of Switch 3 is smaller. Therefore the interface connected to the Printers of Switch 3 will become designated interface and the interface of Switch 4 will be blocked.

Topic 3, Routing Technologies

Question No: 72 – (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:

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 sub configuration mode command.

Question No: 73 – (Topic 3)

Refer to the exhibit.

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When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?

  1. AS numbers must be changed to match on all the routers

  2. Loopback interfaces must be configured so a DR is elected

  3. The no auto-summary command is needed on Router A and Router C

  4. Router B needs to have two network statements, one for each connected network

Answer: A Explanation:

Here we required same autonomous system between router A,B,C.Routing updated always exchange between in same EIGRP EIGRP autonomous system.you can configure more than one EIGRP autonomous system on the same router. This is typically done at a redistribution point where two EIGRP autonomous systems are interconnected. Individual router interfaces should only be included within a single EIGRP autonomous system. Cisco does not recommend running multiple EIGRP autonomous systems on the same set of interfaces on the router. If multiple EIGRP autonomous systems are used with multiple points of mutual redistribution, it can cause discrepancies in the EIGRP topology table if correct filtering is not performed at the redistribution points. If possible, Cisco recommends you configure only one EIGRP autonomous system in any single autonomous system. http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml

Question No: 74 – (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: 75 – (Topic 3)

Refer to the exhibit.

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The network associate is configuring OSPF on the Core router. All the connections to the branches should be participating in OSPF. The link to the ISP should NOT participate in OSPF and should only be advertised as the default route. What set of commands will properly configure the Core router?

  1. Core(config-router)# default-information originate Core(config-router)# network area 0 Core(config-router)# exit

    Core(config)# ip route

  2. Core(config-router)# default-information originate Core(config-router)# network area 0 Core(config-router)# exit

    Core(config)# ip route

  3. Core(config-router)# default-information originate Core(config-router)# network area 0 Core(config-router)# exit

    Core(config)# ip route

  4. Core(config-router)# default-information originate Core(config-router)# network area 0 Core(config-router)# exit

Core(config)# ip route

Answer: C Explanation:

There are two ways to inject a default route into a normal area.1. If the ASBR already has the default route in its routing table, you can advertise theexisting into the OSPF domain with the default-information originate router configuration command.2. If the ASBR doesn’t have a default route, you can add the keyword always to the default-information originate command (default-information originate always).This command will advertise a default route into the OSPF domain, regardless of whether it has a route to Another benefit of adding always keyword is that it can add stability to the internetwork. For

example, if the ASBR is learning a default route from another routing domain such as RIP and this route is flapping, then without the always keyword, each time the route flaps, the ASBR will send a new Type 5 LSA into the OSPF domain causing some instability inside the OSPF domain. With the always keyword, the ASBR will advertise the default inside the OSPF domain always, In the example shown here, only choice C is correct as the wildcard mask correctly specifies the networks, which include all IP addresses in the range. In this question we were told that the ISP link should NOT be configured for OSPF, making choice A incorrect. http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801 ec9f0.shtml

Question No: 76 DRAG DROP – (Topic 3)

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poison reverse: A router learns from its neighbor that a route is down and the router sends an update back to the neighbor with an infinite metric to that routeLSA: The packets flooded when a topology change occurs, causing network routers to update their topological databases and recalculate routes

split horizon: This prevents sending information about a routeback out the same interface that originally learned about the route holddown timer: For a given period, this causes the router to ignore any updates with poorer metrics to a lost network

Question No: 77 – (Topic 3)

Which two statements about the OSPF Router ID are true? (Choose two.)

  1. It identifies the source of a Type 1 LSA.

  2. It should be the same on all routers in an OSPF routing instance.

  3. By default, the lowest IP address on the router becomes the OSPF Router ID.

  4. The router automatically chooses the IP address of a loopback as the OSPF Router ID.

  5. It is created using the MAC Address of the loopback interface.

    Answer: A,D


    From the output of the “show ip ospf database”: r120#show ip ospf data

    OSPF Router with ID ( (Process ID 1) Next, who are the other routers in our area?

    Router Link States (Area 1)

    Link ID

    ADV Router


    Seq# Checksum Link count


    0x8000023A 0x0092B3 1


    0x80000234 0x009CAC 1


    0x8000022C 0x004399 3


    0x80000240 0x0046CB 1

    This tells us there are four routers in Area 1. The router with RID has 3 links in Area 1, every one else has only 1 link. Also the router will chose the highest loopback interface as its OSPF router ID (if available).

    Question No: 78 – (Topic 3)

    What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is in active status?

    1. It routes all traffic that is addressed to the destination network to the interface indicated in the routing table.

    2. It sends a copy of its neighbor table to all adjacent routers.

    3. It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.

    4. It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.

Answer: C Explanation: Introduction to EIGRP Reference:


Feasible Successors

A destination entry is moved from the topology table to the routing table when there is a

feasible successor. All minimum cost paths to the destination form a set. From this set, the neighbors that have an advertised metric less than the current routing table metric are considered feasible successors.

Feasible successors are viewed by a router as neighbors that are downstream with respect to the destination.

These neighbors and the associated metrics are placed in the forwarding table.

When a neighbor changes the metric it has been advertising or a topology change occurs in the network, the set of feasible successors may have to be re-evaluated. However, this is not categorized as a route recomputation.

Route States

A topology table entry for a destination can have one of two states. A route is considered in the Passive state when a router is not performing a route recomputation. The route is in Active state when a router is undergoing a route recomputation. If there are always feasible successors, a route never has to go into Active state and avoids a route recomputation.

When there are no feasible successors, a route goes into Active state and a route recomputation occurs. A route recomputation commences with a router sending a query packet to all neighbors. Neighboring routers can either reply if they have feasible successors for the destination or optionally return a query indicating that they are performing a route recomputation. While in Active state, a router cannot change the next- hop neighbor it is using to forward packets. Once all replies are received for a given query, the destination can transition to Passive state and a new successor can be selected.

When a link to a neighbor that is the only feasible successor goes down, all routes through that neighbor commence a route recomputation and enter the Active state.

Question No: 79 – (Topic 3)

Refer to the exhibit.

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How will the router handle a packet destined for

  1. The router will drop the packet.

  2. The router will return the packet to its source.

  3. The router will forward the packet via Serial2.

  4. The router will forward the packet via either Serial0 or Serial1.

Answer: C Explanation:

Router has pointed default router to and this subnet is connected via serial 2 interface. Router does not have router for the so it will use the default gateway A default route identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route.

Question No: 80 – (Topic 3)

Which statement describes an EIGRP feasible successor route?

  1. A primary route, added to the routing table

  2. A backup route, added to the routing table

  3. A primary route, added to the topology table

  4. A backup route, added to the topology table

Answer: D Explanation:

Two terms that appear often in the EIGRP world are quot;successorquot; and quot;feasible successorquot;. A successor is the route with the best metric to reach a destination. That route is stored in the routing table. A feasible successor is a backup path to reach that same destination that can be used immediately if the successor route fails. These backup routes are stored in the topology table.

Reference: http://study-ccna.com/eigrp-overview

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