[Free] Download Latest (May 2016) Cisco 640-911 Real Exam 21-30

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QUESTION 21

Which three statements are true concerning RFC 1918 IP addresses? (Choose three.)

 

A.

They are globally routable.

B.

They are not globally routable.

C.

They must not be filtered at Internet border interfaces.

D.

They should be filtered at Internet border interfaces.

E.

They include 10.0.0.0/8, 172.16.0.0/16, and 192.168.1.0/24.

F.

They include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

 

Correct Answer: BDF

Explanation:

“The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

10.0.0.0 – 10.255.255.255 (10/8 prefix)

172.16.0.0 – 172.31.255.255 (172.16/12 prefix)

192.168.0.0 – 192.168.255.255 (192.168/16 prefix)”

http://tools.ietf.org/html/rfc1918

 

 

QUESTION 22

Which two statements describe the purpose of RFC 1918? (Choose two.)

 

A.

Establish a range of IP addresses that are dedicated to the growing use of multicast video.

B.

Establish a range of IP addresses that are dedicated to the growing use of peer-to-peer file-sharing applications.

C.

Establish a range of IP addresses that are dedicated to use on internal networks.

D.

Establish a range of IP addresses to address the shrinking pool of globally routable addresses.

E.

Delay the transition to IPv6.

 

Correct Answer: CD

Explanation:

http://tools.ietf.org/html/rfc1918

 

 

QUESTION 23

What are three reasons to migrate from IPv4 to IPv6? (Choose three.)

 

A.

IPv6 eliminates the requirement for NAT.

< span lang="EN-US" style="font-family: ; mso-font-kerning: 0pt; mso-no-proof: yes">B.

IPv6 includes enough IP addresses to allocate more than four billion IP addresses to every person on earth.

C.

IPv6 eliminates the need for VLANs.

D.

Hosts can be assigned an IP address without DHCP.

E.

Hosts can be assigned an IP address without DNS.

 

Correct Answer: ABD

Explanation:

“IPv6 address contains 32 characters vs. 12 in IPv4. This will grant no ip address translation and dynamic changes. We will even don’t need NAT! “

http://www.ipv6.ru/english/history/goipv6.php

” IPv6 uses a 128-bit address, allowing 2128, or approximately 3.4?038 addresses, or more than 7.9?028 times as many as IPv4, which uses 32-bit addresse”;

http://en.wikipedia.org/wiki/IPv6

QUESTION 24

Which two options describe services that are provided by TCP? (Choose two.)

 

A.

session multiplexing

B.

EtherTypes identify destination services

C.

connection-oriented

D.

best-effort packet delivery

E.

binary translation

 

Correct Answer: AC

Explanation:

“TCP is a connection-oriented protocol.”

http://www.diffen.com/difference/TCP_vs_UDP

 

 

QUESTION 25

Which two options describe services that are provided by UDP? (Choose two.)

 

A.

session multiplexing

B.

segmentation

C.

connection-oriented

D.

reliable packet delivery

E.

best-effort packet delivery

 

Correct Answe
r:
AE

Explanation:

“UDP is faster because there is no error-checking for packets.”

http://www.diffen.com/difference/TCP_vs_UDP

 

 

QUESTION 26

Which two options represent a subnet mask that allows for a maximum of 14 available host addresses on a subnet? (Choose two.)

 

A.

255.255.255.240

B.

255.255.255.192

C.

255.255.240.0

D.

255.255.192.0

E.

/14

F.

/21

G.

/26

H.

/28

 

Correct Answer: AH

Explanation:

Example:

Address: 192.168.1.1

Bitmask: 28

Netmask: 255.255.255.240

Network: 192.168.1.0

HostMin: 192.168.1.1

HostMax: 192.168.1.14

Broadcast: 192.168.1.15

Hosts: 16

 

 

QUESTION 27

What is the binary value of the hexadecimal number 0x511?

 

A.

10100011001

B.

10101010101

C.

10110010001

D.

10100010001

E.

10100110011

 

Correct Answer: D

Explanation:

Decimal 1297

Binary 10100010001

Hexadecimal 0x511

Roman MCCXCVII

Dotted decimal 0.0.5.17

 

 

QUESTION 28

What is the binary value of the decimal number 1263?

 

A.

11011101101

B.

10011101111

C.

10011101011

D.

11010001111

E.

10111101111

 

Correct Answer: B

Explanation:

Decimal 1263

Binary 10011101111

Hexadecimal 0x4ef

Roman MCCLXIII

Dotted decimal 0.0.4.239

 

 

QUESTION 29

Which option is an example of a distance vector routing protocol?

 

A.

RIP

B.

OSPF

C.

ARP

D.

IS-IS

 

Correct Answer: A

Explanation:

http://en.wikipedia.org/wiki/Distance-vector_routing_protocol

“Examples of distance-vector routing protocols include RIPv1 and RIPv2 and IGRP.”

OSPF, IS-IS – link-state routing protocols.

ARP – address resolution protocol.

 

QUESTION 30

Which option is an example of an advanced distance vector routing protocol?

 

A.

EIGRP

B.

RIP

C.

OSPF

D.

ARP

 

Correct Answer: A

Explanation:

http://en.wikipedia.org/wiki/Enhanced_Interior_Gateway_Routing_Protocol

“The Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced communications protocol that helps automate routing decisions on a computer network.”

 

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