Please answer following short parts for Upvote (please answer all) a) What DHCP
ID: 3904019 • Letter: P
Question
Please answer following short parts for Upvote (please answer all)
a) What DHCP setting determines how often a DHCP address changes?
b) What is a Static and Dynamic IP address?
c) Explain the role of routers, email servers, firewalls, and authentication servers in addressing the problems associated with DHCP and Network Translation to using network translation in relationship to the analysis of network forensics evidence.
d) Explain the importance of time synchronization for routers, email servers, firewalls, and authentication servers in addressing the problems associated with DHCP and Network Translation to using network translation in relationship to analysis of network forensics evidence.
e) What is purpose of DNS resolution
Explanation / Answer
a) What DHCP setting determines how often a DHCP address changes?
Answer:-
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-> The DHCP stands Dynamic Host Configuration Protocol (DHCP) server,which is configured to allocate static IP addresses to specific computers.
The addresses are used for network identification and communication,Allocation mechanisms vary, depending on platform.
-> Dynamic Host Configuration Protocol (DHCP) is a network protocol that enables a server to automatically assign
an IP address to a computer from a defined range of numbers configured for a given network.
-> Typically, a DHCP server renews your lease automatically, without you (or even a network administrator) having to do anything.
However, if that IP address's lease expires, you'll be assigned a new IP address using the same DHCP protocols.
How DHCP assigns IP addresses:-
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->A user turns on a computer with a DHCP client.
->The client computer sends a broadcast request, looking for a DHCP server to answer.
->The router directs the DISCOVER packet to the correct DHCP server.
->The server receives the DISCOVER packet. Based on availability and usage policies set on the server,
the server determines an appropriate address to give to the client.
->The server then temporarily reserves that address for the client and sends back to the client an OFFER packet, with that address information.
->The server also configures the client's DNS servers, WINS servers, NTP servers, and sometimes other services as well.
->The client sends a REQUEST packet, letting the server know that it intends to use the address.
->The server sends an ACK packet, confirming that the client has a been given a lease on the address for a server-specified period of time.
b) What is a Static and Dynamic IP address?
Answer:-
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Static IP address:-
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->A static Internet Protocol (IP) address (static IP address) is a permanent number assigned to a computer by an Internet service provider (ISP).
->Static IP addresses are useful for gaming, website hosting or Voice over Internet Protocol (VoIP) services.
->A static IP address is also known as a fixed address.
This means that a computer with an assigned static IP address uses the same IP address when connecting to the Internet.
->A static IP address is an IP address that was manually configured for a device, versus one that was assigned via a DHCP server.
It's called static because it doesn't change.
Dynamic IP address:-
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->A dynamic IP address is just a regular address like a static IP is, but it's not permanently tied to any particular device.
->A dynamic Internet Protocol address (dynamic IP address) is a temporary IP address that is assigned to a computing device or node when it's connected to a network.
->A dynamic IP address is an automatically configured IP address assigned by a DHCP server to every new network node.
c) Explain the role of routers, email servers, firewalls, and authentication servers in addressing the problems associated with DHCP and
Network Translation to using network translation in relationship to the analysis of network forensics evidence.
Role of email servers:-
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->An email client knows the outgoing mail SMTP server from its configuration.
->A relaying server typically determines which SMTP server to connect to by looking up the MX (Mail eXchange)
DNS record for each recipient’s domain name (the part of the email address to the right of the at (@) sign).
Role of routers:-
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->DHCP Via Router,Under the General Setup or LAN(Local Area Network) Setup tab in most routers, there is a setting option for DHCP.
This option can control how many IPs are assigned or to enable/disable the server portion of the router.
If this option is disabled, an IP address will have to be statically assigned to each computer, or have a DHCP server on the network.
This goes for wired and wireless. Any connection on a network must have an IP address.
d) Explain the importance of time synchronization for routers, email servers, firewalls, and authentication servers in addressing the problems associated with DHCP
and Network Translation to using network translation in relationship to analysis of network forensics evidence.
->In modern computer networks time synchronization is critical because every aspect of managing, securing, planning, and debugging a network
involves determining when events happen.
->Time also provides the only frame of reference between all devices on the network.
->Without synchronized time, accurately correlating log files between these devices is difficult, even impossible.
->Tracking security breaches, network usage, or problems affecting a large number of components can be nearly impossible
if timestamps in logs are inaccurate.
->Time is often the critical factor that allows an event on one network node to be mapped to a corresponding event on another.
e) What is purpose of DNS resolution
Answer:-
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The DNS stands for Domain Name Service/System,The way these host names are resolved to their mapped IP address is called Domain Name Resolution.
-> Each web server has a unique IP address in textual form, translating it to an IP address is a process known as DNS resolution .
->The DNS is the system used on the Internet for converting domain names to their corresponding IP addresses.
Your operating system will connect to the DNS server configured on your computer and have that server return to you the IP address for the domain name you queried it with.
->For Example,When you enter a domain name in an application that uses the Internet, the application will issue a command to have the operating system
convert the domain name into its IP address, and then connect to that IP address to perform whatever operation it is trying to do.
->Hence the The way these host names are resolved to their mapped IP address is called Domain Name Resolution.
->The Purpose of DNS resolver looks up the resource record information associated with nodes.
A resolver knows how to communicate with name servers by sending DNS queries and heeding DNS responses.