200-301 Exam - Question 15

Question

Which network allows devices to communicate without the need to access the Internet?

Examice · Accepted Answer

This question focuses on the use of private IP address ranges that allow devices to communicate on a local network without needing access to the public Internet. The private IP address ranges as defined by RFC 1918 are as follows: Class A ranges from 10.0.0.0 to 10.255.255.255, Class B ranges from 172.16.0.0 to 172.31.255.255, and Class C ranges from 192.168.0.0 to 192.168.255.255. Among the options provided, only the network 172.28.0.0/16 falls within the Class B private IP address range. Therefore, the correct answer is 172.28.0.0/16.

Samitha · Answer

Private Address Ranges
--------------------------------------
Class A 10.0.0.0 to 10.255.255.255
Class B 172.16.0.0 to 172.32.255.255
class C 192.168.0.0 to 192.168.255.255

So 172.28.0.0/16 in the range of Private IPs in Class B.
Answer is B.

iRodimusPrime · Answer

This question is really badly worded, it's asking what type of address SHOULD you use if you're not connecting to the internet I.E. to save on IPv4 addresses.  Therefore the only private address is correct.

ismatdmour · Answer

This is surely the kind of question which one has to think further and try to predict what the intention behind it actually is. Surely, any network if working isolated from the internet can work with any IP addresses whether private or public. If you will connect this isolated network later to the Internet, if private you will need a NAT and if public (and not assigned to you) you will encounter problems. In any case you can have as well any public ip addresses behind a a NAT as long as the NAT will translate them to a valid public addresses (assigned to you). Unfortunately, poorly written questions are copied from one web site to another. I like about this site that they give the opportunity to vote and discuss the questions. I wonder if CISCO itself had cases of poor questions. Any cases or experiences reported?

rlelliott · Answer

ALL of the answers are correct for what this question ACTUALLY asks, however I believe what they are meaning to ask is which network belongs in the private address range and therefore CANNOT communicate across the internet. Therefore the answer is B. 172.28.0.0/16 which is the only private address range presented.

JWMcInSC · Answer

I agree with the 172.28 being a defined range in 1918, that does not mean the other addresses couldn't work I assure you. That question is not what is a valid 1918 range, the question is which would work if we didn't need public access and they all would.

admin1982 · Answer

Definitely B

ZUMY · Answer

Private IP Address Range by IETF
Class A 10.0.0.0-10.255.255.255
Class B 172.16.0.0 - 172.31.255.255
Class C 192.168.0.0 - 192.168.255.255

Marcelious · Answer

this doesn't make sense to me and I cannot find anything when googling it, as far as I am aware any local network will work so unsure on why the answer is B?

GreatDane · Answer

An IP network, which is not connected to the public Internet, uses private IP addresses.
There is a privare IP addresse range per each IP address class.

A.	172.9.0.0/16

A class B, public IP address range.
Wrong answer.

B.	172.28.0.0/16

A class B, private IP address range.
Correct answer.

C.	192.0.0.0/8

A class C, public IP address range.
Wrong answer.

D.	209.165.201.0/24

A class C, public IP address range.
Wrong answer.

dcouch · Answer

why wouldn't C work?

MSTAHIR · Answer

B Class-B Private address

duongccna · Answer

private range 
class A: 10.0.0.0 - 10.255.255.255        |        10.0.0.0 /8
class B: 172.16.0.0 - 172.31.255.255    | 172.16.0.0 / 12
class C: 182.168.0.0 - 192.168.255.255 | 192.168.0.0/16

somaforever · Answer

Class B 172.16.0.0 to 172.32.255.255

SeMo0o0o · Answer

B is correct

Orson_TheOne · Answer

B is the correct answer

Mattschwim · Answer

Totally B
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200-301 Exam - Question 15

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