The Functions Of Netbios Computer Science Essay

The Functions Of Netbios Computer Science Essay NetBIOS was developed by IBM and sytek as an API for client software to access LAN resources anda also for accessing networking services. Netbios has extended its services to use netbios interface to operate on IBM token ring architecture. Netbios(network basic input/output system) is a program which allows communication between applications of different computer to communicate with in a LAN . netbios allow applications to talk on network and isolate program of hardware dependencies. In recent Microsoft windows operating systems NetBIOS is included as a part of NETBIOS extended user interface(NetBEUI) and it is also used in Ethernet and token ring. NetBIOS frees the application from understanding the details of network including error recovery and request is provided in the form of a Network control block (NCB) specifies a message location and the name of a destination. NetBIOS provides services for session and transport services in the OSI model with out any data format . the standard format is provided by NetBUI. Netbios provides two communication modes session and the datagram among which session mode provides conversation between computers which provides error detection and error recovery. NetBIOS provides an API(application program interface) for software developers which includes network related functions and commands which can be incorporated into software programs. For example, a programmer can use a prewritten NetBIOS function to enable a software program to access other devices on a network. This is much easier than writing the networking code from scratch. The communication in NetBIOS is carried out using a format called network control blocks . the allocation of these blocks is based on the users program and is reserved for input and output respectively. Netbios supports connection oriented (TCP) and connectionless(UDP) communication and also broadcaste and multicasting services like naming, session and datagram FUNCTIONS of NETBIOS Netbios allows applications to talk to each other using protocols like TCP/IP which supports netbios.netbios is a session/transport layer protocol which can be seen as netbeui and netbt . the main function sof NetBIOS are Starting and stopping sessions Name registration Session layer data transfer(reliable) Datagram data transfer (un reliable) Protocol driver and network adapter management functions General or NETBIOS status This service helps in gathering the information about aparticular network name and terminate a trace at local or a remote system. NETBIOS name services NetBIOS name table (NBT) service processes can be used with active directories components, domains and workgroups. The system details can be enumerated by querying the name service. Add, add group, delete and find, the naming services provide the capability to install a LAN adapter card can be done using netbios name services. NETBIOS Session Services Session services provides authentication across workgroups and provides access to resources like files and printers. Once the authentication is done session services provide reliable data transfer by establishing sessions between names over which data can be transmitted. Messages that are send are acknowledge by the receiving station, if an expected acknowledgement is not received the sender retransmit the message NETBIOS Datagram services The datagram services are used to define the way in which a host encapsulates information to netbios header , so that when a request occurs the information from the header is extracted and stores it in the cache. Datagram services allows sending messages one by one, broadcast without requiring a connection. The messages can be send to different networks by knoeing individual names or group names. http://www.fvsolutions.com/Support/index3.htm 2. How can NetBIOS be used to enumerate a Domain, a Host NetBIOS Enumeration Utility (NBTEnum) is a utility for Windows that can be used to enumerate NetBIOS information from one host or a range of hosts. The enumerated information includes the network transports, NetBIOS name, account lockout threshold, logged on users, local groups and users, global groups and users, and shares. If run under the context of a valid user account additional information is enumerated including operating system information, services, installed programs, Auto Admin Logon information and encrypted WinVNC/RealVNC passwords. This utility will also perform password checking with the use of a dictionary file. Runs on Windows NT 4.0/2000/XP/2003. PERL source included. Examples : * nbtenum -q 192.168.1.1 Enumerates NetBIOS information on host 192.168.1.1 as the null user. * nbtenum -q 192.168.1.1 johndoe Enumerates NetBIOS information on host 192.168.1.1 as user johndoe with a blank password. * nbtenum -a iprange.txt Enumerates NetBIOS information on all hosts specified in the iprange.txt input file as the null user and checks each user account for blank passwords and passwords the same as the username in lower case. * nbtenum -s iprange.txt dict.txt Enumerates NetBIOS information on all hosts specified in the iprange.txt input file as the null user and checks each user account for blank passwords and passwords the same as the username in lower case and all passwords specified in dict.txt if the account lockout threshold is 0. http://www.secguru.com/link/nbtenum_netbios_enumeration_utility 3. What vulnerabilities are associated with netbios and how they can be exploited? The following are the some of the vulneabilities of the netbios and their exploitations Windows NetBIOS Name Conflicts vulnerability The Microsoft Windows implementation of NetBIOS allows an unsolicited UDP datagram to remotely deny access to services offered by registered NetBIOS names. An attacker can remotely shut down all Domain Logins, the ability to access SMB shares, and NetBIOS name resolution services. Vulnerable systems: Microsoft Windows 95 Microsoft Windows 98 Microsoft Windows NT Microsoft Windows 2000 NetBIOS Name Conflicts, defined in RFC 1001 (15.1.3.5), occur when a unique NetBIOS name has been registered by more than one node. Under normal circumstances, name conflicts are detected during the NetBIOS name discovery process. In other words, a NetBIOS name should only be marked in conflict when an end node is actively resolving a NetBIOS name. The delivery of an unsolicited NetBIOS Conflict datagram to any Microsoft Windows operating system will place a registered NetBIOS name into a conflicted state. Conflicted NetBIOS names are effectively shut down since they cannot respond to name discovery requests or be used for session establishment, sending, or receiving NetBIOS datagrams. The security implications of conflicting a NetBIOS name depend upon the NetBIOS name affected. If the NetBIOS names associated with the Computer Browser service are conflicted, utilities such as Network Neighborhood may become unusable. If the Messenger Service is affected, the net send command equivalents are unusable. If NetLogon is conflicted, Domain logons can not be authenticated by the affected server, thus allowing an attacker to systematically shutdown the NetLogon service on all domain controllers in order to deny domain services. Finally, conflicting the Server and Workstation Services will stop access to shared resources and many fundamental NetBIOS services such as NetBIOS name resolution. Microsoft Windows 9x NETBIOS password verification vulnerability. A vulnerability exists in the password verification scheme utilized by Microsoft Windows 9x NETBIOS protocol implementation. This vulnerability will allow any user to access the Windows 9x file shared service with password protection. Potential attackers dont have to know the share password. Vulnerable systems: Microsoft Windows 95 Microsoft Windows 98 Microsoft Windows 98 Second Edition Immune systems: Windows NT 4.0 Windows 2000 Anyone can set a password to protect Microsoft Windows 9x systems shared resources. But a vulnerability in the password verification scheme can be used to bypass this protection. To verify the password, the length of the password depends on the length of the data sent from client to server. That is, if a client sets the length of password to a 1 byte and sends the packet to server, the server will only compare the first byte of the shared password, and if there is a match, the authentication will be complete (the user will be granted access). So, all an attacker need to do is to guess and try the first byte of password in the victim. Windows 9x remote management system is also affected since it adopts the same share password authentication method. Exploit: Here is one simple example to demonstrate this bug. Get samba source package and modify source/client/client.c like this: samba-2.0.6.orig/source/client/client.c Thu Nov 11 10:35:59 1999 +++ samba-2.0.6/source/client/client.c Mon Sep 18 21:20:29 2000 @@ -1961,12 +1961,22 @@ struct cli_state *do_connect(char *serve DEBUG(4,( session setup okn)); +/* if (!cli_send_tconX(c, share, , password, strlen(password)+1)) { DEBUG(0,(tree connect failed: %sn, cli_errstr(c))); cli_shutdown(c); return NULL; } +*/ + + password[0] = 0; + c->sec_mode = 0; + do{ + + password[0]+=1; + + }while(!cli_send_tconX(c, share, , password, 1)); Flaw in NetBIOS Could Lead to Information Disclosure Network basic input/output system (NetBIOS) is an application-programming interface (API) that can be used by programs on a local area network (LAN). NetBIOS provides programs with a uniform set of commands for requesting the lower-level services required to manage names, conduct sessions, and send datagrams between nodes on a network.   This vulnerability involves one of the NetBT (NetBIOS over TCP) services, namely, the NetBIOS Name Service (NBNS). NBNS is analogous to DNS in the TCP/IP world and it provides a way to find a systems IP address given its NetBIOS name, or vice versa.   Under certain conditions, the response to a NetBT Name Service query may, in addition to the typical reply, contain random data from the target systems memory. This data could, for example, be a segment of HTML if the user on the target system was using an Internet browser, or it could contain other types of data that exist in memory at the time that the target system responds to the NetBT Name Service query.   An attacker could seek to exploit this vulnerability by sending a NetBT Name Service query to the target system and then examine the response to see if it included any random data from that systems memory.   If best security practices have been followed and port 137 UDP has been blocked at the firewall, Internet based attacks would not be possible. To exploit this vulnerability, an attacker would have to be able to send a specially-crafted NetBT request to port 137 on the target system and then examine the response to see whether any random data from that systems memory is included. In intranet environments, these ports are usually accessible, but systems that are connected to the Internet usually have these ports blocked by a firewall.   How could an attacker exploit this vulnerability?   An attacker could seek to exploit this vulnerability by sending NetBT Name Service queries to a target system and then examining the responses for arbitrary data from the target systems memory.   NetBIOS Name Server Protocol Spoofing (Patch available) Microsoft has released a patch that eliminates a security vulnerability in the NetBIOS protocol implemented in Microsoft Windows systems. This can be exploited to cause a denial of service attack. Affected Software Versions:    Microsoft Windows NT 4.0 Workstation    Microsoft Windows NT 4.0 Server    Microsoft Windows NT 4.0 Server, Enterprise Edition    Microsoft Windows NT 4.0 Server, Terminal Server Edition    Microsoft Windows 2000 The NetBIOS Name Server (NBNS) protocol, part of the NetBIOS over TCP/IP (NBT) family of protocols, is implemented in Windows systems as the Windows Internet Name Service (WINS). By design, NBNS allows network peers to assist in managing name conflicts. Also by design, it is an unauthenticated protocol and therefore subject to spoofing. A malicious user could misuse the Name Conflict and Name Release mechanisms to cause another machine to conclude that its name was in conflict. Depending on the scenario, the machine would as a result either be unable to register a name on the network, or would relinquish a name it already had registered. The result in either case would be the same the machine would not respond requests sent to the conflicted name anymore. If normal security practices have been followed, and port 137 UDP has been blocked at the firewall, external attacks would not be possible. A patch is available that changes the behavior of Windows systems in order to give administrators additional flexibility in managing their networks. The patch allows administrators to configure a machine to only accept a name conflict datagram in direct response to a name registration attempt, and to configure machines to reject all name release datagrams. This will reduce but not eliminate the threat of spoofing. Customers needing additional protection may wish to consider using IPSec in Windows 2000 to authenticate all sessions on ports 137-139. Patch Availability:    Windows 2000:   Ã‚  Ã‚  http://www.microsoft.com/Downloads/Release.asp?ReleaseID=23370    Windows NT 4.0 Workstation, Server, and Server, Enterprise   Ã‚  Ã‚  Edition:Patch to be released shortly.    Windows NT 4.0 Server, Terminal Server Edition: Patch to be   Ã‚  Ã‚  released shortly. 4. How can the security problems associated with netbios be mitigated? Defending against external NetBIOS connections If NetBIOS has to be allowed, the first step is to ensure that only a very small number of devices are accessible.   As youll see, leaving your network open to external NetBIOS traffic significantly increases the complexity of system hardening.   Complexity is the enemy of system assurance. Next, ensure that the exposed systems are hardened by, Disabling the systems ability to support null sessions Defining very strong passwords for the local administrator accounts Defining very strong passwords for shares, assuming you absolutely have to have shares on exposed systems Keeping the Guest account disabled Under no circumstances allowing access to the root of a hard drive via a share Under no circumstances sharing the Windows or WinNT directories or any directory located beneath them Crossing your fingers Mitigating Factors Any information disclosure would be completely random in nature. By default, Internet Connection Firewall (ICF) blocks those ports. ICF is available with Windows XP and Windows Server 2003. To exploit this vulnerability, an attacker must be able to send a specially crafted NetBT request to port 137 on the destination computer and then examine the response to see whether any random data from that computers memory is included. For intranet environments, these ports are typically accessible, but for Internet-connected computers, these ports are typically blocked by a firewall Some of the ways in which the intruder can be prevented from attacking the target system are Limit the network hosts that can access the service. Limit the user who accesses the service. Configure service which allows only authenticated connections. Limit the degree of access that would permit a user to change configuration of networks. links http://www.securiteam.com/windowsntfocus/5WP011F2AA.html http://www.securiteam.com/windowsntfocus/5MP02202KW.html http://www.securiteam.com/windowsntfocus/5DP03202AA.html http://www.secguru.com/link/nbtenum_netbios_enumeration_utility http://www.securityzero.com/uploaded_files/vulnerabilities_report.pdf http://www.securiteam.com/exploits/5JP0R0K4AW.html http://www.windowsitpro.com/article/netbios/information-disclosure-vulnerability-in-microsoft-netbios.aspx http://www.informit.com/articles/article.aspx?p=130690seqNum=11 http://www.microsoft.com/technet/security/Bulletin/MS03-034.mspx http://marc.info/?l=bugtraqm=96480599904188w=2 http://descriptions.securescout.com/tc/14002 http://www.securityspace.com/smysecure/viewreport.html?repid=3style=k4 http://blogs.techrepublic.com.com/security/?p=196

Difference Between Critical Analysis and Analytical Thinking

When you really want to reflect and put your points across, it’s said that you have to speak through your mind but from your heart with what you have lived and experienced. In this piece, I am going to use real life issues and experiences to help put forth my genuine reflections on the different ways of thinking analytical, critical and strategic. To start with, I would like to discuss the latest and prominent issue in Mumbai, whether it should be called Mumbai or Bombay. There was this debate going around in the class and one of my peers analyzed that it should be called Bombay because 80% people in Mumbai want to call it by that name. Then he also corroborated this by linking it with one of the newspaper and saying that it has stated that 65% of the public want to call this city Bombay and not Mumbai. He also conducted his survey and collected data of people from various parts of the city, the South Mumbai, the Central Mumbai and the North Mumbai. He later analyzed the question on the data collected and concluded that indeed people of this city want to call it by its colonial name Bombay. He was indeed very right because he had broken down this problem and had made all effort to reach every corner of the city for the survey. His survey number too indicated the same and with the help of analytical thinking, he convinced that people want to call this city Bombay. Thus the beauty of analytical thinking is that with the data and figure well in placed you can possibly prove anything without anyone even questioning it. However I was born in Mumbai knew this city in and out and decided to find the answer to the same problem but critically. More than numbers and figures, I relied more on my knowledge and experiences of this beautiful city. Therefore, I too conducted a similar but asked one more question, Why do they want to call Mumbai as Bombay? And the answer was surprising. They wanted to call it Mumbai but as the name of Mumbai was Bombay in the business circle, they wanted it to named Bombay. Moreover, the survey conducted by my friend was done in commercial areas of the South, central and North Mumbai. Where majority of the people come from other cities and have no knowledge and understanding of the local feelings. So the analytical thinking over here clearly missed out the local feeling of the people as well as the understanding of the complex community. I have mentioned the above experience because I want to bring forth the major difference between analytical and critical thinking. While analytical thinking did prove and gave an answer to the above question and even looked more credible because of the numbers, it failed to include local feeling and knowledge of the local area. This is one of the major differences between analytical and critical thinking. While analytical thinking segregates the problem into many areas and tries to back it up with figures, critical thinking uses the knowledge and experience and put them into logical thinking to formulate an answer. As far as strategic thinking is concern, I am still trying to define the meaning and the closer I am defining it the farther it goes. It’s like debating whether GOD exist or not. GOD is there we believe, but on experiences and intuitions. We cannot see Him but still feel He’s there. Similarly, strategic thinking eludes its definite existence but is always there. You can call it a plan of actions designed to achieve a particular goal. This plan of action is implemented by considering and weighing several facets and views. Your knowledge and most importantly your understanding and application is of uttermost importance for strategic thinking. After these prerequisites comes the analysis and synthesis of these prerequisites keeping the importance of all possible view and possibilities open. Hence, strategic thinking never has a definite answer or solution. Its all about selecting the best possibility. So even If I do manage to come out with a winning strategy other might ridicule it simply because they might look at it from different angle. So more you are ridiculed or castigated the better will be your strategic thinking. Today leadership is like a soul trapped between his internal consciousness and external realities. The soul can choose infinite possibilities but yet have to select a very few. Moreover, whatever he does should be such that it takes the side that benefits the all. In today world, a leadership would be difficult to sustain without keeping all the three things like financial, social and environmental aspects. And to keep this leadership has to inculcate power with ethics for any sort of sustainability. Leadership can be short-lived if one doesn’t compromise on some of the ethics at the same time would be dangerous if he follows none. So it has t o have it only to the point of sustainability. When an enlightened one writes a poem thousands read it. However, each one of them perceives it in a way they want to and this depends on their own life experiences and knowledge. Similarly, I use to perceive the World in a way I have seen it with my eyes and observed. But to really understand you need to perceive it through the eyes of many others and that is one thing that I have learned from this edifying experience of the last two weeks. Today when I am leading, I am open to infinite possibilities and views. I am trying to use the five why technique in my mind to reach out to the possible root cause.. Then the model that I am trying to work is to use critical thinking first and then use analytical thinking to corroborate the findings of the critical thinking. This I feel would help counter the limitations of the analytical thinking and at the same time will help foster the critical thinking results.

Lies Youve Been Told About Annotated Bibliography Mla

Lies You've Been Told About Annotated Bibliography Mla What You Need to Do About Annotated Bibliography Mla Beginning in the Next 9 Minutes Third, be certain to put all your references in an alphabetical order. Bibliography generator is another service that is provided by us, so you could save yourself the time involved during the period of citation creation. Please be aware it is also appropriate to use the parenthetical references explained in the site section also. When one wants to enhance the grade of the bibliography and prevent losing face before the professor, he can make the most of the annotated bibliography maker which will address the issue of formatting once for all. One of the main advantages of our bibliography maker is it enables the students to choose from various regions of study like science, nursing, mathematics or social sciences. When you choose us to assist you with a bibliography APA making you know that you're receiving the best assistance possible. If you need assistance with your academic assignment, there's no better choice for you than our services! If you are thinking about how to compose an annotated bibliography which will be formatted correctly and will include all the relevant sources, then you've come to the proper location for paper writing help. While an abstract also summarizes a guide, book, Web site or other sort of publication, it's purely descriptive. While an abstract also summarizes a guide, book, web site or other sort of publication, it's purely descriptive. The New Angle On Annotated Bibliography Mla Just Released Annotations incorporate a review of the work, a critique of the author or trustworthiness of the source, and a discussion of whether the source will be beneficial to your research. You must also assess the source and choose whether it's credible and whether it's useful. So as to compose an annotated bibliography, you must be in a position to summarize the source. The exact same source cou ld have been published on more than 1 date, including an on-line version of an original source. There are annotated bibliographies that contain a mixture of annotations. Annotated bibliography template is going to be a vivid example and you are going to be able to make an outstanding annotation with no mistakes and flaws! An annotation should provide enough info to produce a reader decide whether to read the comprehensive work. Some annotations might include all 3 paragraphs. The One Thing to Do for Annotated Bibliography Mla Since an write-up is a typical format, you don't require a format description bracket. Please remember that all of your text, for example, write-up beneath the citation, must be indented so the author's last name is the sole text that's flush left. Jokes aside, if you'd like to master your academic writing just like us you want to understand how to compose an annotative bibliography. There are particular teacher or professors who might ask for a certai n kind of Word Annotated Bibliography Templates and thus the professor needs to be consulted in regards to the exact same. Especially in regards to an MLA Style annotated bibliography, a great deal of men and women thrive to discover the most suitable approach to compose a bibliography correctly enough. Students may determine the present bibliography in MLA format that's followed in the majority of the colleges and schools. Bibliography generator MLA has become the most creative and useful facet of MLA bibliography format site. Bibliography APA generator is beneficial for students, who wishes to get the sources to be cited in the particular format. Citation Machine can help you cite your sources. Annotated Bibliography Mla - the Conspiracy The word analytical clues you into the concept that you have to rate the sources you're working with and offer some type of critique. Examine the sources you gathered! When citing sources make sure to use the appropriate citation style for the training course. Precisely, it is possible to easily come to understand about the means of citing sources in the event of books, online sources, journals and articles. Vital Pieces of Annotated Bibliography Mla Each of your entries will start with a complete bibliographic entry. Should you need a really original bibliography page, you always have the option to consult Place-4-Papers. A totally free bibliography is not ev er an option, because scam papers may be detectable. Now you're ready to start writing your very own annotated bibliography. The very first line of the citation that starts with the author's last name is the sole text that's flush left in the whole bibliography. Therefore it is truly important to compose an annotated bibliography together with the work. Whenever your teacher or professor assigns your project, they will let you know to format your bibliography in a particular citation style.

We Must Educate the Children of Illegal Immigrants Essay

Immigration laws have been a subject of debate throughout American history, especially in states such as California and Texas, where immigrant populations are high. Recently, some citizens have been questioning whether we should continue to educate the children of illegal immigrants. While this issue is steeped in emotional controversy, we must not allow divisive us against them rhetoric to cloud our thinking. Yes, educating undocumented immigrants costs us, but not educating them would cost us much more. Those who propose barring the children of illegal immigrants from our schools have understandable worries. They worry that their state taxes will rise as undocumented children crowd their school systems. They worry about†¦show more content†¦One way to help these and other states is to have the federal government pick up the cost of educating undocumented children, with enough funds to alleviate the overcrowded classrooms that cause parents such concern. Such cost shifting could have a significant benefit, for if the federal government had to pay, it might work harder to stem the tide of illegal immigrants. So far, attempts to bar undocumented children from public schools have failed. In the 1982 case of Plyler v. Doe, the Supreme Court ruled on the issue. In a 5-4 decision, it overturned a Texas law that allowed schools to deny education to illegal immigrants. Martha McCarthy reports that Texas had justified its law as a means of preserving financial resources, protecting the state from an influx of illegal immigrants, and maintaining high quality education for resident children (128). The Court considered these issues but concluded that in the long run the costs of educating immigrant children would pale in comparison to the costs--both to the children and to society--of not educating them. It isnt hard to figure out what the costs of not educating these children would be. 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