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Author Topic: Another LAT Question  (Read 782 times)
rcwm
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« on: December 18, 2000, 05:21:00 AM »

Still trying to work this out:

Your coporate network consists of a single segment. All computes communicate using TCP/IP and are configured to use IP addresses in the range 10.0.0.1 - 10.0.0.100. A Proxy server computer with two network cards provides access to the Internet.  One network card is assigned IP address 10.0.0.1 and the other 100.20.30.40.  Which IP addresses should you list in the Local Address Table (LAT) on the Proxy Server Computer?

A. 10.0.0.1 - 10.255.255.255
B. 100.20.30.40 - 100.20.30.255
C. 10.0.0.1 - 10.0.0.100, 100.20.30.40
D. 10.0.0.1 - 10.0.0.100

Transcender says: D

Why is this so?

Thanks again, guys.
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Spid
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« Reply #1 on: December 18, 2000, 02:50:00 PM »

The LAT should only contain the IP address ranges for the Internal network.  If you accidently have an External address or External address range in the LAT, you have opened up your entire network to the outside and a naughty hacker could gain access to your internal network.  Wink

Since the question states that the IP address range for your network is 10.0.0.1 - 10.0.0.100, the network card address on the Proxy server for the Internal network is the 10.0.0.1 card.

So...since we only want Internal network addresses in the LAT, the address range entered into the LAT would be 10.0.0.1 - 10.0.0.100.  Answer is "D".

Hope this helps!

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Kenny
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« Reply #2 on: December 18, 2000, 08:55:00 PM »

We'll take it one answer at a time, since punching out the wrong answers is just as important as grabbing the right answers.
----------
Your coporate network consists of a single segment. All computes communicate using TCP/IP and are configured to use IP addresses in the range 10.0.0.1 - 10.0.0.100.(*)
 A Proxy server computer with two network cards provides access to the Internet. One network card is assigned IP address 10.0.0.1 (*)
and the other 100.20.30.40.(*)
 Which IP addresses should you list in the Local Address Table (LAT)(*) on the Proxy Server Computer?

(*) = Important piece of information.

A. 10.0.0.1 - 10.255.255.255
(A is wrong, because while it includes the addresses on the local subnet, it includes ones that aren't on the subnet as well.)

B. 100.20.30.40 - 100.20.30.255
(B is wrong because it is not part of the local subnet.)

C. 10.0.0.1 - 10.0.0.100, 100.20.30.40
(C is wrong because it includes the external card address, which is not part of the local subnet.)

D. 10.0.0.1 - 10.0.0.100
(Correct. The addresses specified are the local subnet addresses given to you by the question, and it also includes the internal network card.)

-Kenny

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seeker
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« Reply #3 on: December 18, 2000, 09:34:00 PM »

Just to put in that xxx.xxx.xxx.255 can not be, is not valid. that rules out automatically a and b. you look at answer c and you see that 100. is not on the internal local. so thier goes c. sometimes just reading the answer you can knock off 2 answers (A$B). the 1st and last octet can not be 255.

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