Explain DNS and DHCP. How does DNS differ from DCHP configuration?
There are various resources, computers and services connected to the internet or private network.So
these must be named to be uniquely identified. Network devices understand numerical identifiers (IP
address)to get connected whereas human would like to have names that are meaningful (Domain names).
Now, Domain Name System (DNS) translate these domain names to their respective IP address to be
located and accessed.There are various other information stored in domain name which are also
interpreted by DNS.DNS follows hierarchical order.
Dynamic Host Configuration Protocol (DHCP) is a computer protocol which allows a certain computer to
to join an IP based network without out having to to give a user defined IP address.The main thing is,
DHCP provides unique IP address to these clients automatically and renew it automatically when they
rejoin the network.
Here, DNS all about giving names to computer and other network services in a hierarchy of domain
names.These are used in TCP/IP networks to located the location of the parties with the aid of user
friendly name.DHCP is all about assigning unique IP address to the clients trying to join a certain network
automatically
Why is it important for your online business application to use a static IP address rather than have
it dynamically assigned?
Our online business application is given a certain domain name which will be used by the user to
access it.This domain name will be unique and DNS translates it to its respective IP address.Now this
IP address will locate our web application in a huge pool of IP addresses in TCP/IP network of the
Internet.
Static IP address means IP address assigned manually and will remain constant until a change
is made but dynamic IP changes in a period of time and are assigned automatically.DNS assumes the
IP address linked to a certain domain name, will always remain constant.It will fetch that IP address
and make it available.If the IP address of the a certain domain starts to change dynamically,DNS wouldn't
be able to locate the correct IP address of the domain and we won't be able to access our web application
in an efficient time.As every time IP changes every thing like DNS database as well as IP of the network
devices are to be changed and linked which will cause huge service downtime and over heads.
What role can the following play in business-to-business e-commerce?
a.Virtual Private Network (VPN) or Grid computing services
Virtual Private Network(VPN) allows a secure access to various business information and resources.
An encrypted tunnel across the Internet is established for this.This network is virtual because it is
hidden to other except the connecting pair over the Internet.The existence of Internet all over
the world at the same time.
VPN is an effective way for business-to-business e-commerce to extend their network to be reached by
anyone, anywhere and anytime in a secure and cost-effective fashion.
The basic feature of Grid computing services is to split the on going processes or jobs and handed out
to various computers or servers over the network.Now this will make the processing of any kind of task
very fast on any machine that is available.This kind of service is very useful to tasks which requires
very high speed of processing like scientific research but are gradually getting popular among
e-business.Now this is very helpful to organizations because they can minimize their hardware
resources as well as labor cost using Grids.For example, rather than using a mainstream server of their
own, a company can make use of cheap Grid servers.Server cost and maintenance cost can be reduced
which will benefit them economically.
b. Next generation of wireless mesh networks
Wireless mesh networks are defined as multihop systems where nodes (like laptops, mobile phones and
other networking devices) assist each other in transmitting packets in a network in various adverse
conditions.WNDs provides flexible and very reliable data transfer through huge number of devices.
The other special feature of the devices used in these systems is each node(devices) can act like a router
and relay message to it neighboring nodes.This devices are intelligent enough to transmit data without
any loss as they choose alternative path when required.When the number of nodes are add, travel path
of data get shorten which provides good quality of data transfer.
With properties that satisfies multiple conflicting demands of redundancy, distributed communication ,
reliability, flexibility as well as self healing, WMNs are getting really popular.As these comes with low
price
c. Cloud or Social Cloud applications.
Cloud computing means to compute various jobs using the internet.Resources like servers,software and
information are provide via Internet according to demand of the user.The basic feature is, huge
number of processing computers(mainframe),database,software and other resources are placed in
various locations called cloud can be accessed by the user to make use of it.
We can find various features of cloud computing like:
Low cost making the use of resources over the Internet which will obiously be an aid to various
companies having great ideas but lack resources for it.Since the data are center.As these can be
accessed via web there are device and location independent.These are easy to be maintained as
as cloud applications need not to be installed.These are much more secure due to centralization of
data.These are more reliable as they use multi-redundant site and can handle
With these sorts of feature and many more of them, cloud are very effective for business-to-business
e-commerce.
If clouding computing is the 'black box', then grid computing is a component as the 'white
box'.Explain what you interpret about that statement.
Cloud is all about working and achieving the
cloud.We don't need to bother about how it works.We just can purchase the service and know how to
work on it i.e. it's behaviors and interfaces.Hence Cloud is a black 'box'.
Girds are all about dividing the processes to various computer and devices over a network.This division
of jobs all depend upon nature of the job, business requirement and resources available.So there are to
be set up according to the need.Hence Grid is a 'white box'.
Reference:
Cloud computing.Wikipedia. 2010. Eikimedia Foundation, Inc. Retrived on April 13, from
http://en.wikipedia.org/wiki/Cloud_computing
Domain Name System.Wikipedia. 2010. Wikimedia Foundation, Inc.Retrieved on April 10, 2010, from
http://en.wikipedia.org/wiki/Domain_Name_System
Bradley M (n.d.), DHCP - Dynamic Host Configuration Protocol ,About.com Guide, Retrieved on April
11, 2010 from http://compnetworking.about.com/cs/protocolsdhcp/g/bldef_dhcp.htm
Getting a grip on grid computing (2004). Business Week. Retrieved on April 12, 2010, from
http://www.businessweek.com/magazine/content/04_42/b3904107_mz063.htm
IP address.Wikipedia. 2010.Wikimedia Foundation, Inc. Retreived on April 11, 2010, from
http://en.wikipedia.org/wiki/Ip_address
Remote-Access VPNs: Business Productivity, Deployment, and SecurityConsiderations. Retrieved from
11April 2010 from http://www.cisco.com/en/US/prod/collatera/vpndevc/ps6032/ps6094/ps6120
/prod_white_paper0900aecd804fb79a.html
Poor, R (2003).Wireless Mesh Network.Retreived on April 12, 2010, from
http://www.sensorsmag.com/networking-communications/standards-protocols/wireless-
No comments:
Post a Comment