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

 

QUESTION 51

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

 

A.

Source IP address

B.

Destination IP address

C.

Source and destination IP address

D.

Source MAC address

E.

Destination MAC address

 

Correct 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.

 

 

QUESTION 52

A switch has 48 ports and 4 VLANs. How many collision and broadcast domains exist on the switch (collision, broadcast)?

 

A.

4, 48

B.

48, 4

C.

48, 1

D.

1, 48

E.

4, 1

 

Correct Answer: B

Explanation:

A switch uses a separate collision domain for each port, and each VLAN is a separate broadcast domain.

 

 

QUESTION 53

Which statement about IPv6 is true?

 

A.

Addresses are not hierarchical and are assigned at random.

B.

Only one IPv6 address can exist on a given interface.

C.

There are 2.7 billion addresses available.

D.

Broadcasts have been eliminated and replaced with multicasts.

 

Correct Answer: D

Explanation:

IPv6 has three types of addresses, which can be categorized by type and scope:

Unicast addresses. A packet is delivered to one interface.

Multicast addresses. A packet is delivered to multiple interfaces.

Anycast addresses. A packet is delivered to the nearest of multiple interfaces (in terms of routing distance).

IPv6 does not use broadcast messages.

Unicast and anycast addresses in IPv6 have the following scopes (for multicast addresses, the scope are built into the address structure):

Link-local. The scope is the local link (nodes on the same subnet).

Site-local. The scope is the organization (private site addressing).

Global. The scope is global (IPv6 Internet addresses).

In addition, IPv6 has special addresses such as the loopback address. The scope of a special address depends on the type of special address.

Much of the IPv6 address space is unassigned.

http://technet.microsoft.com/en-us/library/cc757359(v=ws.10).aspx

 

 

QUESTION 54

What is the purpose of assigning an IP address to a switch?

 

A.

provides local hosts with a default gateway address

B.

allows remote management of the switch

C.

allows the switch to respond to ARP requests between two hosts

D.

ensures that hosts on the same LAN can communicate with each other

 

Correct Answer: B

Explanation:

A switch is a layer 2 device and doesn’t use network layer for packet forwarding. The IP address may be used only for administrative purposes such as Telnet access or for network management purposes.

 

 

QUESTION 55

Refer to the exhibit. The internetwork is using subnets of the address 192.168.1.0 with a subnet mask of 255.255.255.224. The routing protocol in use is RIP version 1. Which address could be assigned to the FastEthernet interface on RouterA?

 

clip_image001

 

A.

192.168.1.31

B.

192.168.1.64

C.

192.168.1.127

D.

192.168.1.190

E.

192.168.1.192

 

Correct Answer: D

Explanation:

Subnet mask 255.255.255.224 with CIDR of /27 which results in 32 hosts per.

 

192.168.1.31 is the broadcast address for sunbet ‘0’ 192.168.1.64 is the network address for subnet ‘2’ 192.168.1.127 is the broadcast address for subnet ‘3’ 192.168.1.192 is the network address for subnet ‘6’

 

clip_image002

 

 

QUESTION 56

Which option is a valid IPv6 address?

 

A.

2001:0000:130F::099a::12a

B.

2002:7654:A1AD:61:81AF:CCC1

C.

FEC0:ABCD:WXYZ:0067::2A4

D.

2004:1:25A4:886F::1

 

Correct Answer: D

Explanation:

IPv6 Address Notation

IPv6 addresses are denoted by eight groups of hexadecimal quartets separated by colons in between them.

Following is an example of a valid IPv6 address:

2001:cdba:0000:0000:0000:0000:3257:9652

Any four-digit group of zeroes within an IPv6 address may be reduced to a single zero or altogether omitted.

Therefore, the following IPv6 addresses are similar and equally valid:

2001:cdba:0000:0000:0000:0000:3257:9652

2001:cdba:0:0:0:0:3257:9652

2001:cdba::3257:9652

Reference: http://www.ipv6.com/articles/general/IPv6-Addressing.htm

 

 

 

 

QUESTION 57

Which IP addresses are valid for hosts belonging to the 10.1.160.0/20 subnet? (Choose three.)

 

A.

10.1.168.0

B.

10.1.176.1

C.

10.1.174.255

D.

10.1.160.255

E.

10.1.160.0

F.

10.1.175.255

 

Correct Answer: ACD

Explanation:

All IP address in IP ranges between: 10.1.160.1 and 10.1.175.254 are valid as shown below

Address: 10.1.160.0 00001010.00000001.1010 0000.00000000

Netmask: 255.255.240.0 = 20 11111111.11111111.1111 0000.00000000

Wildcard: 0.0.15.255 00000000.00000000.0000 1111.11111111

 

Which implies that:

Network: 10.1.160.0/20 00001010.00000001.1010 0000.00000000

HostMin: 10.1.160.1 00001010.00000001.1010 0000.00000001

HostMax: 10.1.175.254 00001010.00000001.1010 1111.11111110

Broadcast: 10.1.175.255 00001010.00000001.1010 1111.11111111

 

 

QUESTION 58

Which router command will configure an interface with the IP address 10.10.80.1/19?

 

A.

router(config-if)# ip address 10.10.80.1/19

B.

router(config-if)# ip address 10.10.80.1 255.255.0.0

C.

router(config-if)# ip address 10.10.80.1 255.255.255.0

D.

router(config-if)# ip address 10.10.80.1 255.255.224.0

E.

router(config-if)# ip address 10.10.80.1 255.255.240.0

F.

router(config-if)# ip address 10.10.80.1 255.255.255.240

 

Correct Answer: D

Explanation:

255.255.224 equal /19 in CIDR format hence the answer

 

 

QUESTION 59

If an Ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?

 

A.

1024

B.

2046

C.

4094

D.

4096

E.

8190

 

Correct Answer: C

Explanation:

Each octet represents eight bits. The bits, in turn, represent (from left to right): 128, 64, 32 , 16 , 8, 4, 2, 1

Add them up and you get 255. Add one for the all zeros option, and the total is 256. Now, take away one of these for the network address (all zeros) and another for the broadcast address (all ones). Each octet represents 254 possible hosts. Or 254 possible networks. Unless you have subnet zero set on your network gear, in which case you could conceivably have 255.

The CIDR addressing format (/20) tells us that 20 bits are used for the network portion, so the maximum number of networks are 2^20 minus one if you have subnet zero enabled, or minus 2 if not.

You asked about the number of hosts. That will be 32 minus the number of network bits, minus two. So calculate it as (2^(32-20))-2, or (2^12)-2 = 4094

 

 

QUESTION 60

R1 is configured with the default configuration of OSPF. From the following list of IP addresses configured on R1, which address will the OSPF process select as the router ID?

 

clip_image003

 

A.

192.168.0.1

B.

172.16.1.1

C.

172.16.2.1

D.

172.16.2.225

 

Correct Answer: A

Explanation:

The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequence.

+ 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 router ID can be manually assigned

In this case, because a loopback interface is not configured so the highest active IP address 192.168.0.1 is chosen as the router ID.

 

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