Ashikin_Hussin

One day, a father of a very wealthy family took his son on a trip to the country with the firm purpose of showing his son how poor people live. They spent a couple of days and nights on the farm of what would be considered a very poor family. On their return from their trip, the father asked his son, “How was the trip?”


“It was great, Dad.”


“Did you see how poor people live?” the father asked.


“Oh yeah,” said the son.


“So, tell me, what did you learn from the trip?” asked the father.


The son answered, “I saw that we have one cat and they had four. We have a pool that reaches to the middle of our garden, and they have a creek that has no end. We have imported lanterns in our garden, and they have the stars at night. Our patio reaches to the front yard, and they have the whole horizon. We have a small piece of land to live on, and they have fields that go beyond our sight. We have servants who serve us, but they serve others. We buy our food, but they grow theirs. We have walls around our property to protect us; they have friends to protect them.”


The boy’s father was speechless.


Then his son added, “Thanks, Dad, for showing me how poor we are.”

Introduction to Network Types
LAN, WAN and Other Area Networks


By Bradley Mitchell, About.com Guide
See More About:types of area networks local area networks wide area networks
One way to categorise the different types of computer network designs is by their scope or scale. For historical reasons, the networking industry refers to nearly every type of design as some kind of area network. Common examples of area network types are:
LAN - Local Area Network
WLAN - Wireless Local Area Network
WAN - Wide Area Network
MAN - Metropolitan Area Network
SAN - Storage Area Network, System Area Network, Server Area Network, or sometimes Small Area Network
CAN - Campus Area Network, Controller Area Network, or sometimes Cluster Area Network
PAN - Personal Area Network
DAN - Desk Area Network
LAN and WAN were the original categories of area networks, while the others have gradually emerged over many years of technology evolution.
Note that these network types are a separate concept from network topologies such as bus, ring and star.


See also - Introduction to Network Topologies
LAN - Local Area Network


A LAN connects network devices over a relatively short distance. A networked office building, school, or home usually contains a single LAN, though sometimes one building will contain a few small LANs (perhaps one per room), and occasionally a LAN will span a group of nearby buildings. In TCP/IP networking, a LAN is often but not always implemented as a single IP subnet.
In addition to operating in a limited space, LANs are also typically owned, controlled, and managed by a single person or organization. They also tend to use certain connectivity technologies, primarily Ethernet and Token Ring.


WAN - Wide Area Network


As the term implies, a WAN spans a large physical distance. The Internet is the largest WAN, spanning the Earth.
A WAN is a geographically-dispersed collection of LANs. A network device called a router connects LANs to a WAN. In IP networking, the router maintains both a LAN address and a WAN address.


A WAN differs from a LAN in several important ways. Most WANs (like the Internet) are not owned by any one organization but rather exist under collective or distributed ownership and management. WANs tend to use technology like ATM, Frame Relay and X.25 for connectivity over the longer distances.


LAN, WAN and Home Networking


Residences typically employ one LAN and connect to the Internet WAN via an Internet Service Provider (ISP) using a broadband modem. The ISP provides a WAN IP address to the modem, and all of the computers on the home network use LAN (so-called private) IP addresses. All computers on the home LAN can communicate directly with each other but must go through a central gateway, typically a broadband router, to reach the ISP.
Other Types of Area Networks


While LAN and WAN are by far the most popular network types mentioned, you may also commonly see references to these others:
Wireless Local Area Network - a LAN based on WiFi wireless network technology
Metropolitan Area Network - a network spanning a physical area larger than a LAN but smaller than a WAN, such as a city. A MAN is typically owned an operated by a single entity such as a government body or large corporation.
Campus Area Network - a network spanning multiple LANs but smaller than a MAN, such as on a university or local business campus.
Storage Area Network - connects servers to data storage devices through a technology like Fibre Channel.
System Area Network - links high-performance computers with high-speed connections in a cluster configuration. Also known as Cluster Area Network.

 SURAH AL-QADR

Diantara kita mungkin pernah mendengar tanda-tanda malam lailatul qadar yang telah tersebar di masyarakat luas. Sebahagian kaum muslimin awam memiliki beragama khurafat dan keyakinan bathil

seputar tanda-tanda lailatul qadar, diantaranya: pohon sujud, bangunan-bangunan tidur, air tawar berubah asin, anjing-anjing tidak menggonggong, dan beberapa tanda yang jelas bathil dan rusak. Maka dalam masalah ini keyakinan tersebut tidak boleh diyakini kecuali berdasarkan atas dalil, sedangkan tanda-tanda di atas sudah jelas kebathilannya karena tidak adanya dalil baik dari al-Quran ataupun hadist yang mendukungnya.

Lalu bagaimanakah tanda-tanda yang benar berkenaan dengan malam yang mulia ini ? Nabi shallallahu’alaihi wa sallam pernah mengabarkan kita di beberapa sabda beliau tentang tanda-tandanya, yaitu:

1. Udara dan suasana pagi yang tenang

Ibnu Abbas radliyallahu’anhu berkata: Rasulullah shallahu’alaihi wa sallam bersabda:

“Lailatul qadar adalah malam tentram dan tenang, tidak terlalu panas dan tidak pula terlalu dingin, esok paginya sang surya terbit dengan sinar lemah berwarna merah” (Hadist hasan)

2. Cahaya mentari lemah, cerah tak bersinar kuat keesokannya

Dari Ubay bin Ka’ab radliyallahu’anhu, bahwasanya Rasulullah shallahu’alaihi wa sallam bersabda:

“Keesokan hari malam lailatul qadar matahari terbit hingga tinggi tanpa sinar bak nampan” (HR Muslim)

3. Terkadang terbawa dalam mimpi

Seperti yang terkadang dialami oleh sebagian sahabat Nabi radliyallahu’anhum

4. Bulan nampak separuh bulatan

Abu Hurairoh radliyallahu’anhu pernah bertutur: Kami pernah berdiskusi tentang lailatul qadar di sisi Rasulullah shallahu’alaihi wa sallam, beliau berkata,

“Siapakah dari kalian yang masih ingat tatkala bulan muncul, yang berukuran separuh nampan.” (HR. Muslim)

5. Malam yang terang, tidak panas, tidak dingin, tidak ada awan, tidak hujan, tidak ada angin kencang dan tidak ada yang dilempar pada malam itu dengan bintang (lemparan meteor bagi setan)

Sebagaimana sebuah hadits, dari Watsilah bin al-Asqo’ dari Rasulullah shallallahu’alaihi wa sallam:

“Lailatul qadar adalah malam yang terang, tidak panas, tidak dingin, tidak ada awan, tidak hujan, tidak ada angin kencang dan tidak ada yang dilempar pada malam itu dengan bintang (lemparan meteor bagi setan)” (HR. at-Thobroni dalam al-Mu’jam al-Kabir 22/59 dengan sanad hasan)

6. Orang yang beribadah pada malam tersebut merasakan lezatnya ibadah, ketenangan hati dan kenikmatan bermunajat kepada Rabb-nya tidak seperti malam-malam lainnya.