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Computer Networking

Computer networks are collections of computers which are connected together in order to communicate and transfer information. Questions about computer networks, networking protocols, and how to set them up belong here.

18,810 Questions

Which topology is commonly used and why?

Answer: Star topology is commonly used in present days. It is used so much because it has more speed, and fast data transmission. It has one good quality that if one computer become out of order then no other computer experience any affacted.

What is unmanageable switch?

Unmanageable Switch -

Unmanageable Switches are just working on layer 2 switching.

these switches are basically counted under dumb switch catagory.

By using these kinds of switches we dont have to do anything, not even IP addresses.

These switches are Plug n Play devices.

Managable Switches -

Managable switches comes under smart switch category.

These switches performs on layer2 as well as layer3 switching.

By using manageable switches we can perform or manage following services over the network infrastructure -

DHCP (Dynamic Host Configuration Protocol)

VLAN (Virtual LAN)

Layer3 Routing

etc..

These switches are not Plug N Play devices, we need to manage means we need to introduce them to the network first before using it.

Siapa hacker pertama di dunia?

Terminologi hacker muncul pada awal tahun 1960-an diantara para anggota organisasi mahasiswa Tech Model Railroad Club di Laboratorium Kecerdasan Artifisial Massachusetts Institute of Technology (MIT). Kelompok mahasiswa tersebut merupakan salah satu perintis perkembangan teknologi komputer dan mereka berkutat dengan sejumlah komputer mainframe. Kata hacker pertama kalinya muncul dengan arti positif untuk menyebut seorang anggota yang memiliki keahlian dalam bidang komputer dan mampu membuat program komputer yang lebih baik ketimbang yang telah dirancang bersama. Kemudian pada tahun 1983, istilah hacker berubah menjadi negatif. Pasalnya, pada tahun tersebut untuk pertama kalinya FBI menangkap kelompok kriminal komputer The 414syang berbasis di Milwaukee AS. 414 merupakan kode area lokal mereka. Kelompok yang kemudian disebut hacker tersebut dinyatakan bersalah atas pembobolan 60 buah komputer, dari komputer milik Pusat Kanker Memorial Sloan-Kettering hingga komputer milik Laboratorium Nasional Los Alamos. Satu dari pelaku tersebut mendapatkan kekebalan karena testimonialnya, sedangkan 5 pelaku lainnya mendapatkan hukuman masa percobaan. Kemudian pada perkembangan selanjutnya muncul kelompok lain yang menyebut-nyebut diri hacker, padahal bukan. Mereka ini (terutama para pria dewasa) yang mendapat kepuasan lewat membobol komputer dan mengakali telepon (phreaking). Hacker sejati menyebut orang-orang ini 'cracker' dan tidak suka bergaul dengan mereka. Hacker sejati memandang cracker sebagai orang malas, tidak bertanggung jawab, dan tidak terlalu cerdas. Hacker sejati tidak setuju jika dikatakan bahwa dengan menerobos keamanan seseorang telah menjadi hacker. Para hacker mengadakan pertemuan setiap setahun sekali yaitu diadakan setiap pertengahan bulan Juli di Las Vegas. Ajang pertemuan hacker terbesar di dunia tersebut dinamakan Def Con. Acara Def Con tersebut lebih kepada ajang pertukaran informasi dan teknologi yang berkaitan dengan aktivitas hacking. Hackermemiliki konotasi negatif karena kesalahpahaman masyarakat akan perbedaan istilah tentang hacker dan cracker. Banyak orang memahami bahwa hackerlah yang mengakibatkan kerugian pihak tertentu seperti mengubah tampilan suatu situs web (defacing), menyisipkan kode-kode virus dsb. Padahal, mereka adalah cracker. Crackerlah menggunakan celah-celah keamanan yang belum diperbaiki oleh pembuat perangkat lunak (bug) untuk menyusup dan merusak suatu sistem. Atas alasan ini biasanya para hacker dipahami dibagi menjadi 2 golongan White Hat Hackers, yakni hacker yang sebenarnya dan cracker yang sering disebut dengan istilah Black Hat Hackers. Kemudian pada tahun 1995 keluarlah film berjudul Hackers, yang menceritakan pertarungan antara anak muda jago komputer bawah tanah dengan sebuah perusahaan high-techdalam menerobos sebuah sistem komputer. Dalam film tersebut digambarkan bagaimana akhirnya anak-anak muda tersebut mampu menembus dan melumpuhkan keamanan sistem komputer perusahaan tersebut. Salah satu pemainnya adalah Angelina Jolie berperan sebagai Kate Libby alias Acid Burn. Pada tahun yang sama keluar pula film berjudul The Net yang dimainkan oleh Sandra Bullock sebagai Angela Bennet. Film tersebut mengisahkan bagaimana perjuangan seorang pakar komputer wanita yang identitas dan informasi jati dirinya di dunia nyata telah diubah oleh seseorang. Dengan keluarnya dua film tersebut, maka eksistensi terminologi hacker semakin jauh dari yang pertama kali muncul di tahun 1960-an di MIT.

What is specified by the network number in an IP address?

The network number in an IP address is that portion of the IP address that matches the subnet mask. For instance, if the IP address is 10.11.12.13 and the subnet mask is 255.255.0.0, then the network number is 10.11.0.0. If the subnet mask is 255.255.255.0, then the network number is 10.11.12.0.

The network layer (layer 2 in the OSI model) in the TCP/IP protocol stack uses the network number to determine if the destination address is directly reachable, or if the frame needs to be routed through the default gateway.

How many collision domain do you have if you have 3 HUSwith 10 clients connected per HUB?

If, by "HUSwith" you mean "hubs with", and by "hub" you really mean "hub" and not "switch" then you'll have either three collision domains (if the three hubs are not connected to each other) or a single collision domain (if the three hubs are connected to each other). Replace the hubs with switches and you'll have 30 collision domains, if the switches are not connected, or 32 or 33 if they are (depending on how the inter-switch connections are made: two switches connected to a common third vs. each switch connected to both the other two).

How do you make bus port connectors in Logic Works?

Press Ctrl+B (or alternative go to "Schematic" --> " New Breakout")

Enter the Bus name followed by the number of pins you want and press OK.

example for name is

D0..2 -> creates Bus D with signals D0, D1 , D2

What does plug in mean?

Plug-ins are basically other features to download. For example in Mozilla Firefox you may get a music control plug in which you can control itunes/windows media player while using the browser.

How many bits in a bit?

There is only 1 bit in a bit. If you are meaning how many bits are in a byte, there are 8 bits in one byte.

What are 3 types of authentication used to access a wireless network?

There are many types of authentications can be used in access wireless network. mainly 3 types are used: User only Authentication, Device Only Authentication, User+Device Authentication. They are self explanatory.

Why the global catalog server and infrastructure master not avail in the same domain controllers?

1. GC holds group membership of universal group. while

Infrastructure hold group information in domain level.

2. We can't set infrastructure master and GC together on same DC.

If

infrastructure master and GC is on the same server then infrastructure will not function because it will never find the data that is out of date.


Syed Mukthar Ahammed.

The Infrastructure Master (IM) role should be held by a domain controller that is not a Global Catalog server (GC). If the Infrastructure Master runs on a Global Catalog server it will stop updating object information because it does not contain any references to objects that it does not hold. This is because a Global Catalog server holds a partial replica of every object in the forest. As a result, cross-domain object references in that domain will not be updated and a warning to that effect will be logged on that DC's event log. If all the domain controllers in a domain also host the global catalog, all the domain controllers have the current data, and it is not important which domain controller holds the infrastructure master role.

What is a synonym for encounter form and what is important to remember if an encounter form has preprinted ICD-9CM and CPT codes?

Superbill is another term used. The most important thing to remember about pre-printed ICD-9 and CPT codes is these codes change annually so it is important to review the form to ensure all codes are current.

How do you calculate throughput?

Throughput in manufacturing or in queuing problems is calculated through the following formula: Throughput time (Tt) = Work in process (WiP) X Cycle time (Ct)

*where WiP represents work in process or persons in a queue

* and Ct represents the time it takes for a product to go through the manufacturing processes or for a person to join and leave a queue after being served.

e.g. If it takes 2 minutes to get served coffee in a restaurant and there are 10 people in the queue

Tt = WiP x Ct : 10 x 2 = 20min

The throughput time tells that it will take the last man 20minutes to get served from the moment he joins the queue.

What are the letters following after the domain name tell you the type of site?

The Top Level Domain (TLD), classic examples being .gov, .mil, .com, .edu, and .org, provide an indication in many cases as to what type of site you're visiting. The Top Level Domain (TLD), classic examples being .gov, .mil, .com, .edu, and .org, provide an indication in many cases as to what type of site you're visiting.

How do you install Equalizer in a home stereo system?

You must have 'tape monitor' button on your stereo

Hook play in from equalizer out and rec out to eqalizer in.

Then press tape monitor button.

How do you reset a Lost password on a belkin router?

You have to call the service number on the back of the router.They will ask you some questions,and then they should be able to reset that for you.