ISSC361 Networks of Networks and End to End Networking Discussion Response
Need to respond to the below two students discussions with at least 150 words minimum per discussion response. Below int he bold will be the questions the students are responding to.
Explain the role of ARP and how it works. How might this be a security issue?
What is the difference between a global IP address and a private IP address?
Describe how a gateway converts a private IP address into a global IP address using NAT. How this important to us in today’s information technology environment?
Student one:
1. When a host need to send a packet to another host of the same LAN. It protocol stack must change the destination IP address into the correct MAC address Smith (2016). ARP work in this way the system request to get MAC address of the destination of the system. And the request is reply by the destination system by providing its IP address. This might create security issues such as ARP spoofing, that is when the attacker uses fake ARP massage over a local area network. it can also lead to compromised network by attackers.
2. A Public IP address is an IP address that can be accessed over the internet. Is just like your Mailing address, that is where you get your mails. The public IP address is the Globally unique IP address assign to a computer device. Whiles Private IP address is used to assign to to your personal computer without letting them directly exposed to public or internet. when a computer is assign to a private IP address , the local device can see this computer through its private IP address.
3. Network Address Translation( NAT) is a gateway function that translate private IP address into global IP address. When the device on the LAN want to communicate with the global internet, their private IP address must be translated. The gateway functions as a proxy point of communication between the two. The translation work in this form: the private IP attempt to communicate with the global internet, a socket is established to handle traffic between the requester and the host, the host assigns a random port to socket on the source side while filling in its’ own IP address, the host transmits the packet over the private LAN, which is sent to the gateway, the gateway starts the NAT process by assigning port number to the socket and recalling the host’s IP address gateway rewrite the packet header information so the source address has the global IP address and the gateway’s post number, gateway forwards modified packet to the next router enroute to the final destination, when packet reaches destination, the recipient think the sending host’ IP address is what shows but it is the gateway’s address (Smith 2016).
References
Smith, R. E. (2016), Elementary Information Security, 2nd edition. Subury, MA: Jones & Bartlett Leaning.
What is the difference between Puplic and private IP address? April 2 2019. Retrieved from https:www.iplocation.net/public-vs-private-ip-address.
-Frank
Student two:
Hello and Good Evening Class,
ARP is Address Resolute protocol, which is a networking layer used to convert an IP address into a physical address. The security issues with ARP is that the protocol sends reply packets even when a request was not sent to the target machine. This allows for attackers to send forged packets and creates spoofing vulnerabilities. If a system or tool is vulnerable to spoofing it could allow an attacker to continually target a given system, leading to a loss of personal information and further targeting.
A global IP address is a globally unique IP assigned to a system, while a private IP is used to assign a computer within a specific space while not allowing the system to be directly exposed to the internet. This is the difference between having multiple computers at home accessing the same IP through global IP use, while the private IP will be specific to each system.
Private IPs can only use private networks, to work around this network address translation (NAT) remaps an IP into another by modifying the network address information in the packets. This allows a given system to have access to the internet while keeping the private IP secured. NATs are an important aspect of firewall security, conserving public address and allowing for stricter control of access to resources on both sides of the firewall. This is essentially a first line of defense against attackers or malicious code.
-Adam
Smith, Richard E. Elementary Information Security Second Edition. https://online.vitalsource.com/#/books/9781284093070/cfi/6/2!/4/2/2@0:0
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