[Free] 2017(July) EnsurePass Examcollection Cisco 200-105 Dumps with VCE and PDF 111-120

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

Question No: 111 – (Topic 3)

What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)

  1. It requires the use of ARP.

  2. It can support multiple IPv6 subnets on a single link.

  3. It supports up to 2 instances of OSPFv3 over a common link.

  4. It routes over links rather than over networks.

Answer: B,D Explanation:

Here is a list of the differences between OSPFv2 and OSPFv3:

->They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols

->OSPFv3 introduces new LSA types

->OSPFv3 has different packet format

->OSPFv3 uses different flooding scope bits (U/S2/S1)

->OSPFv3 adjacencies are formed over link-local IPv6 communications

->OSPFv3 runs per-link rather than per-subnet

->OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses

->OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs)

->OSPFv3 Neighbor Authentication done with IPsec (AH)

->OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and- ipv6.html

Question No: 112 – (Topic 3)

What are two drawbacks of implementing a link-state routing protocol? (Choose two.)

  1. the sequencing and acknowledgment of link-state packets

  2. the requirement for a hierarchical IP addressing scheme for optimal functionality

  3. the high volume of link-state advertisements in a converged network

  4. the high demand on router resources to run the link-state routing algorithm

  5. the large size of the topology table listing all advertised routes in the converged network

Answer: B,D Explanation:

Link State routing protocols, such as OSPF and IS-IS, converge more quickly than their distance vector routing protocols such as RIPv1, RIPv2, EIGRP and so on, through the use of flooding and triggered updates. In link state protocols, changes are flooded immediately

and computed in parallel. Triggered updates improve convergence time by requiring routers to send an update message immediately upon learning of a route change. These updates are triggered by some event, such as a new link becoming available oor an existing link failing. The main drawbacks to link state routing protocols are the amount of CPU overhead involved in calculating route changes and memory resources that are required to store neighbor tables, route tables and a complete topology table. http://www.ciscopress.com/articles/article.asp?p=24090amp;seqNum=4

Question No: 113 – (Topic 3)

Refer to the exhibit.

image

Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router?

A. 10.1.1.2

B. 10.154.154.1

C. 172.16.5.1

D. 192.168.5.3

Answer: C Explanation:

CCNA Tutorial: The OSPF Router ID (RID) http://www.thebryantadvantage.com/CCNACertificationExamTutorialOSPFRouterIDRID.ht m

When determining the Router ID (RID) of an OSPF-enabled router, OSPF will always use the numerically highest IP address on the router’s loopback interfaces, regardless of whether that loopback is OSPF-enabled.

What if there is no loopback? OSPF will then use the numerically highest IP address of the physical interfaces, regardless of whether that interface is OSPF-enabled.

Question No: 114 – (Topic 3)

Refer to the exhibit.

image

image

From R1, a network administrator is able to ping the serial interface of R2 but, unable to ping any of the subnets attached to RouterB. Based on the partial outputs in the exhibit, what could be the problem?

  1. EIGRP does not support VLSM.

  2. The EIGRP network statements are incorrectly configured.

  3. The IP addressing on the serial interface of RouterA is incorrect.

  4. The routing protocol has summarized on the classful boundary.

  5. EIGRP has been configured with an invalid autonomous system number.

Answer: D Explanation:

CCNA – EIGRP Common Question Reference:

http://www.orbitco-ccna-pastquestions.com/CCNA-EIGRP-Common-Question.php

Explanation:

If you look carefully at the R2 ip route, you will discover that the R2 does not learn any network from R1; this is because the routing protocol used here (EIGRP) performs auto summary when advertising routes to peers across a network. So in this case the address 172.17.0.0/16 is a summarized address. If the router was configured with no auto summary command, R2 LAN addresses would have been advertised and reached.

Question No: 115 – (Topic 3)

Which type of EIGRP route entry describes a feasible successor?

  1. a backup route, stored in the routing table

  2. a primary route, stored in the routing table

  3. a backup route, stored in the topology table

  4. a primary route, stored in the topology table

Answer: C Explanation:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml 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.

Feasible successor is a route whose Advertised Distance (AD) is less than the Feasible Distance (FD) of the current best path. A feasible successor is a backup route, which is not stored in the routing table but, stored in the topology table.

Question No: 116 – (Topic 3)

What are the two default metrics used by EIGRP for route selection? (Choose two.)

  1. Bandwidth

  2. Delay

  3. Reliability

  4. Load

  5. MTU

Answer: A,B Explanation:

EIGRP adds together weighted values of different network link characteristics in order to calculate a metric for evaluating path selection.

These characteristics include:

  • Delay (measured in 10s of microseconds)

  • Bandwidth (measured in kilobytes per second)

  • Reliability (in numbers ranging from 1 to 255; 255 being the most reliable)

  • Load (in numbers ranging from 1 to 255; 255 being saturated)

Various constants (K 1 through K 5) are able to be set by a user to produce varying routing behaviors. However by default, only delay and bandwidth are used in the weighted formula to produce a single 32bit metric:

image

Note: Default K values are: K1 = K3 = 1 and K2 = K4 = K5 = 0When K5 is equal to 0 then [

K5/( K4 reliability)] is defined to be 1

Use of the default constants effectively reduces the formula above to:

image

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enhanced- interior-gateway-routing-protocol-eigrp/whitepaper_C11-720525.html

Question No: 117 – (Topic 3)

Refer to Exhibit:

image

The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router. Which routers are likely to have been elected as DR? (Choose two.)

  1. Corp-1

  2. Corp-2

  3. Corp-3

  4. Corp-4

  5. Branch-1

  6. Branch-2

Answer: D,F

Explanation: There are 2 segments on the topology above which are separated by Corp-3 router. Each segment will have a DR so we have 2 DRs.

To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below:

The highest IP address assigned to a loopback (logical) interface.

If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.

In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40)

amp; Branch-2 (10.2.20.20) have highest 鈥渁ctive鈥?IP addresses so they will become DRs.

Question No: 118 – (Topic 3)

Refer to the exhibit.

image

Which two statements are true about the loopback address that is configured on RouterB? (Choose two.)

  1. It ensures that data will be forwarded by RouterB.

  2. It provides stability for the OSPF process on RouterB.

  3. It specifies that the router ID for RouterB should be 10.0.0.1.

  4. It decreases the metric for routes that are advertised from RouterB.

  5. It indicates that RouterB should be elected the DR for the LAN.

Answer: B,C

Explanation: A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) – B is correct.

The router-ID is chosen in the order below:

The highest IP address assigned to a loopback (logical) interface. If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.

-The loopback interface will be chosen as the router ID of RouterB – C is correct.

Question No: 119 – (Topic 3)

Refer to the exhibit.

image

Based on the exhibited routing table, how will packets from a host within the 192.168.10.192/26 LAN be forwarded to 192.168.10.1?

  1. The router will forward packets from R3 to R2 to R1.

  2. The router will forward packets from R3 to R1 to R2.

  3. The router will forward packets from R3 to R2 to R1 AND from R3 to R1.

  4. The router will forward packets from R3 to R1.

Answer: C Explanation:

From the routing table we learn that network 192.168.10.0/30 is learned via 2 equal- cost paths (192.168.10.9 amp;192.168.10.5) – traffic to this network will be load-balanced.

Question No: 120 – (Topic 3)

Which statement is true, as relates to classful or classless routing?

  1. Classful routing protocols send the subnet mask in routing updates.

  2. RIPv1 and OSPF are classless routing protocols.

  3. Automatic summarization at classful boundaries can cause problems on discontiguous subnets.

  4. EIGRP and OSPF are classful routing protocols and summarize routes by default.

Answer: C

Explanation: http://www.ciscopress.com/articles/article.asp?p=174107amp;seqNum=3

RIPv1, RIPv2, IGRP, and EIGRP all auto-summarize classful boundaries by default (OSPF does not).To make discontiguous networks work, meaning you don#39;t want classful boundries to summarize, you need to turn off auto-summary.

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