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Exam N10-007 topic 1 question 30 discussion

Actual exam question from CompTIA's N10-007
Question #: 30
Topic #: 1
[All N10-007 Questions]

In a service provider network, a company has an existing IP address scheme. Company A's network currently uses the following scheme:

Company b uses the following scheme:

Subnet 1: 192.168.1.50/28 -
The network administrator cannot force the customer to update its IP scheme. Considering this, which of the following is the BEST way for the company to connect these networks?

  • A. DMZ
  • B. PAT
  • C. NAT
  • D. VLAN
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by ArcRiseGen at Feb. 26, 2020, 5 p.m.

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exampreper
Highly Voted 4 years, 11 months ago
in a nutshell: when you are at home on your private network your devices have a private Ip normally in the 192.168.1.0/24 range. These devices use their assigned private ip's to communicate locally however when a private ip needs to talk to a website like amazon, NAT will assigns/masks/translates (however you want to say it) that private IP to your public IP. Your public ip is provided by your ISP. NAT was created to address the ever depleting usable IPv4 address
upvoted 18 times
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ep123
Highly Voted 4 years, 2 months ago
I have read and understood the explanations, so what would a question look like if were suppose to use PAT instead? I understand what PAT is used for but it gets confusing between PAT and NAT when both are answer choices
upvoted 5 times
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Some_Random_Nerd
Most Recent 2 years, 10 months ago
addresses that start with 192.168 are internal. you wont ever see an ip address in the wild that starts with that. So the two companies could be using iDenTical ip addresses and it wouldn't make a bit of difference, because the two networks are separated by at least two routers, and however many routers between them. Network address translation is the mechanism that handles all of the in and out data. It lets all your internal devices to share a single outward facing ip address that is assigned to your router, and conceals the internal ip addresses from view.
upvoted 1 times
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ekafasti
3 years, 8 months ago
I'm confused why PAT isn't a better answer here. Both are forms of NAT, but consider the subnet masks: Company A: /26, /26 (64*2 = 128 IPs, 124 hosts), and /28 on the other (16 IPs, 14 hosts). The types of NAT are Static NAT, Dynamic NAT, and PAT: with with static (1 to 1) or dynamic (many to many pool) NAT, you're probably paying for multiple public IPs (expensive) per site. With PAT, you only need one public IP per site and map to the private addresses using ports instead of separate IPs. I mean technically, PAT is a form of NAT, but if they want the BEST answer, PAT seems best to me.
upvoted 4 times
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regardoz
3 years, 10 months ago
i find it hard when PAT and NAT together
upvoted 3 times
b0ugi3
3 years, 9 months ago
think of PAT as a better version of NAT which is applied to a larger organization. It combines the IP address with a random port number, 80001, 80002, 80003, etc. Nat simply changes the IP address going out, so it converts a private address to a public one. PAT changes private IP address to public but also tags a random port number to them for more IP availability.
upvoted 3 times
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BoyuanLIU
4 years, 2 months ago
Why not VLAN? They are all private class C network shouldn't be any NAT involved...?
upvoted 2 times
Nisita
1 year, 7 months ago
They have overlapping IP address schemes. While VLANs (Virtual Local Area Networks) are useful for segmenting a network and isolating traffic within those segments, they are not designed to handle overlapping IP address schemes.
upvoted 1 times
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Mornay
4 years, 10 months ago
Also add that NAT has some security capabilities too, a common scenario is NAT / Proxy servers - they have cache , request and receive / analyze traffic on behalf of their private hosts. Often Web filtering ( allowing / blocking web traffic, SSL inspections, Application and DNS filtering are included in these layer 7 devices, also known as NGFW (Next generation Firewalls)
upvoted 1 times
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ArcRiseGen
5 years, 2 months ago
I'm still a little confused about how NAT works. Can someone explain why it's NAT for this question? (I literally have no IT job experience, everything is self taught at home)
upvoted 4 times
Lynot123
4 years, 3 months ago
When at home you use LAN. All you LAN devices have are given Private IP Addresses to communicate with each other. But if you want to communicate outside the LAN network, you cant risk using your private IP Address used because of there bad people/hackers that to track you and get to know more of you. As result, that Private IP Address, is converted to Public IP address at the Gateway/Router. The public IP Address will then communicate to the outside world. When getting back your response, the public IP address with be converted again back to Private IP address to communicate in LAN Network. Hope that makes sense
upvoted 9 times
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