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

 

QUESTION 61

Identify the four valid IPv6 addresses. (Choose four.)

 

A.

::

B.

::192:168:0:1

C.

2000::

D.

2001:3452:4952:2837::

E.

2002:c0a8:101::42

F.

2003:dead:beef:4dad:23:46:bb:101

 

Correct Answer: ABEF

Explanation:

http://www.intermapper.com/ipv6validator

http://www.ripe.net/lir-services/new-lir/ipv6_reference_card.pdf

 

clip_image002

 

 

QUESTION 62

Which characteristics are representative of a link-state routing protocol? (Choose three.)

 

A.

provides common view of entire topology

B.

exchanges routing tables with neighbors

C.

calculates shortest path

D.

utilizes event-triggered updates

E.

utilizes frequent periodic updates

 

Correct Answer: ACD

Explanation:

Each of routers running link-state routing protocol learns paths to all the destinations in its “area” so we can say although it is a bit unclear. Link-state routing protocols generate routing updates only (not the whole routing table) when a change occurs in the network topology so

Link-state routing protocol like OSPF uses Dijkstra algorithm to calculate the shortest path – > .

Unlike Distance vector routing protocol (which utilizes frequent periodic updates), link-state routing protocol utilizes event-triggered updates (only sends update when a change occurs) ->

 

 

QUESTION 63

Which command enables IPv6 forwarding on a Cisco router?

 

A.

ipv6 host

B.

ipv6 unicast-routing

C.

ipv6 local

D.

ipv6 neighbor

 

Correct Answer: B

Explanation:

Enabling IPv6 on Cisco IOS Software Technology

http://www.ciscopress.com/articles/article.asp?p=31948&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 64

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?

 

clip_image003

 

A.

R2 and R3

B.

R1 and R3

C.

R3 and S2

D.

R1, S1, S2, and R3

E.

R1, S1, S2, R3, a
nd S3

 

Correct 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 65

Refer to the exhibit. What is the simplest way to configure routing between the regional office network 10.89.0.0/20 and the corporate network?

 

clip_image004

 

A.

router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.2

B.

router2(config)#ip route 10.89.3.0 255.255.0.0 10.89.16.2

C.

router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.1

D.

router2(config)#ip route 0.0.0.0 0.0.0.0 10.89.16.1

 

Correct Answer: D

Explanation:

The next hop of the static route should be 10.89.16.1, which is the IP address for router R1 in this example. Since this router is a stub router with only a single connection to the WAN, the simplest thing to do is to configure a single static default route back to the HQ network.

 

 

QUESTION 66

How many bits are contained in each field of an IPv6 address?

 

A.

24

B.

4

C.

8

D.

16

 

Correct Answer: D

Explanation:

One of the key advantages IPv6 brings is the exponentially larger address space. The following will outline the basic address architecture of IPv6.

128-bit-long addresses

Represented in hexadecimal format:

Uses CIDR principles: prefix/prefix length

x:x:x:x:x:x:x:x, where x is a 16-bit hex field

The last 64 bits are used for the interface ID

http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf

 

 

QUESTION 67

Which three approaches can be used while migrating from an IPv4 addressing scheme to an IPv6 scheme? (Choose three)

 

A.

static mapping of IPv4 address to IPv6 addresses

B.

configuring IPv4 tunnels between IPv6 islands

C.

use DHCPv6 to map IPv4 addresses to IPv6 addresses

D.

use proxying and translation (NAT-PT) to translate IPv6 packets into IPv4 packets

E.

configure IPv6 directly

F.

enable dual-stack routing

 

Correct Answer: BDF

Explanation:

Connecting IPv6 islands with tunnels

An IPv6 island is a network made of IPv6 links directly connected by IPv6 routers. In the early days of IPv6 deployment, there are many IPv6 islands. IPv6 in IPv4 tunnels are used to connect those islands together. In each island, one (or more) dual stack routers are designated to encapsulate and decapsulate IPv6 packets within IPv4 packets. Different mechanisms have been developed to manage tunnels: automatic tunnels3, configured tunnels3, tunnel brokers3, 6over43, 6to43,…

 

Reference: http://www.petri.co.il/ipv6-transition.htm

 

Network Address Translation – Protocol Translation (NAT-PT) The NAT-PT method enables the ability to either statically or dynamically configure a translation of a IPv4 network address into an IPv6 network address and vice versa. For those familiar with more typically NAT implementations, the operation is very similar but includes a protocol translation function. NAT-PT also ties in an Application Layer Gateway (ALG) functionality that converts Domain Name System (DNS) mappings between protocols.

 

Dual Stack

The simplest approach when transitioning to IPv6 is to run IPv6 on all of the devices that are currently running IPv4. If this is something that is possible within the organizational network, it is very easy to implement.

However, for many organizations, IPv6 is not supported on all of the IPv4 devices; in these situations other methods must be considered.

 

Reference: http://www.opus1.com/ipv6/howdoitransitiontoipv6.html

 

 

QUESTION 68

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?

 

clip_image006

 

A.

2

B.

3

C.

4

D.

5

E.

6

F.

7

 

Correct 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:+ 172.16.2.64/30+ 172.16.2.228/30+ 172.16.2.232/30+ 172.16.3.0/24

Note: Other networks will be learned as “Directly connected” networks (marked with letter “C”)

 

 

QUESTION 69

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

 

A.

It uses broadcast for its routing updates.

B.

It supports authentication.

C.

It is a classless routing protocol.

D.

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

E.

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

F.

It does not send the subnet mask any updates.

 

Correct Answer: BCE

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 224.0.0.9 -> B is not correct.

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

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

 

 

QUESTION 70

Which two commands will display the current IP address and basic Layer 1 and 2 status of an interface? (Choose two.)

 

A.

router#show version

B.

router#show ip interface


C.

router#show protocols

D.

router#show controllers

E.

router#show running-config

 

Correct Answer: BC

Explanation:

The outputs of “show protocols” and “show ip interface” are shown below:

 

Global values:Internet Protocol routing is enabledSerial0/0 is up, line protocol is downInternet address is 10.1.1.1/30Serial0/1 is up, line protocol is downInternet address is 209.65.200.225/30Serial0/2 is up, line protocol is downSerial0/3 is up, line protocol is downNVI0 is up, line protocol is upInterface is unnumbered. Using address of NVI0 (0.0.0.0)Loopback0 is up, line protocol is upInternet address is 10.1.10.1/32Loopback1 is up, line protocol is upInternet address is 10.1.2.1/27Loopback6 is up, line protocol is up

 

Serial0/0 is up, line protocol is downInternet address is 10.1.1.1/30Broadcast address is 255.255.255.255Address determined by non-volatile memoryMTU is 1500 bytesHelper address is not setDirected broadcast forwarding is disabledMulticast reserved groups joined: 224.0.0.5Outgoing access list is not setInbound access list is not setProxy ARP is enabledLocal Proxy ARP is disabledSecurity level is defaultSplit horizon is disabledICMP redirects are always sentICMP unreachables are always sentICMP mask replies are never sentIP fast switching is enabledIP fast switching on the same interface is enabledIP Flow switching is disabledIP CEF switching is disabledIP Feature Fast switching turbo vectorIP multicast fast switching is enabledIP multicast distributed fast switching is disabledIP route- cache flags are FastRouter Discovery is disabledIP output packet accounting is disabledIP access violation accounting is disabledTCP/IP header compression is disabledRTP/IP header compression is disabledPolicy routing is disabledNetwork address translation is enabled, interface in domain insideBGP Policy Mapping is disabledWCCP Redirect outbound is disabledWCCP Redirect inbound is disabledWCCP Redirect exclude is disabled

 

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