Hard or difficult

things getting more complicated. i have too much thinking on my mind, but no action to do. it feels hot in the head.

what do i do. i don’t know, i don’t understand.
i lost my self easily, being affected by surrounding environment easily. hanging on empty promise by my self. big mouthed, don’t understand what i have said.
“tomorrow i will give the answer” but i still don’t know what the answer. and then, the answer come out carelessly without thinking to my self.

things getting more complicated when everybody know my premature answer. my mind almost blowing. especially when i thought of the reason why my friend was not here. the bomb in my mind became tears. i cant hold it. the saddest day in my life: things done badly according to a premature decision.

just kill me.

i can’t undo things. actually i can, but i think it will be bad to the other side, because things have gotten more complicated and involve more people. then, i thought that i should try doing this premature answer. even though it is not that convenient.

i hope no body read my post. haha

(and actually before i post this article, i have done something bigger that more people know my decision)

Networking (continued)

In the last session, I state an example for the networking process. Now, I will explain it in another way.

There is an OSI model for the standard reference of communication protocol. In OSI, there are 7 self-contained layer as a step for the communication protocol. They are (from the digital process until the analogue signal) a) application, b) presentation, c) session, d) transport, e) Network, f) data link, and g) physical layer. For the simplicity, lets reduce those layer into a) application layer, b) transport layer, c) network layer, d) link layer, and e) physical layer.

I say, HTTP is the first step of networking process (for this instance TCP/IP). HTTP (Hypertext Transfer Protocol) is one of application layer. TCP (Transmission Control Protocol) present in the transport layer. Another transport layer is UDP (User Datagram Protocol). IP (Internet Protocol) is a network layer. Ethernet card is one of a link layer besides Wi-Fi card. Link layer makes analogue signal from digital signal. Then, the analogue signal is transmitted through physical layer to another communication media (like computer). The example of physical layer is coaxial cable, fiber-optic cable, or radio wave (electromagnetic wave).

Data (data packet) that we want to send, step-by-step will through the layers. The data will be somewhat converted by application layer becomes “segment”. The segment then being a “message” after converted by transport layer. Then, it will be datagram through the network layer. Finally it is being a frame before it is transferred through the physical layer after being converted by link layer.

TCP, in its activity will somewhat ask for the agreement from the destined object before it send the data. And also, it will make sure that the sent data is not damaged. If it is damaged then, TCP will ask for the data resend. In contrast, UDP (another transport layer) will not ask any feedback from the destined object. It will directly send the data.

IP is protocol that establishes the route of the data from the sender to receiver. IP needs IP addresses to establish the connection. Without IP address, the communication media cannot be identified by another digital communication media. Commonly, size of IP address is 32 bit. The example of IP address is xxxxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxxx (where x is 0 or 1) or yyy.yyy.yyy.yyy (where y is a number from 0-9. yyy has maximum value 255). That commonly used IP address is a IP address 4th version (IPv4). Each IP address can only define a communication media. IPv4 have maximum combination number 232.

Now, there is new version of IP address. It is IPv6 (the 6th version of IP address). IPv6 has a size 128 bit. It contains 2128 combination number. It uses the hexadecimal number (from 0-9 then a-f). The example of IPv6 is zzzz.zzzz.zzzz.zzzz.zzzz.zzzz.zzzz.zzzz where z is hexadecimal number.

Networking

Hampir semua komunikasi masa kini, di dunia maya terhubung dengan networking. Pada dasarnya, networking menghubungkan antara satu media komunikasi ke media lain. Networking menghubungkan media komunikasi sati dengan yang lainnya seperti sebuah jaring (web).

Kita misalkan sebuah personal komputer adalah salah satu media komunikasi. Agar komputer ini bisa terhubung dengan komputer lainnya (berkomunikasi), ada sebuah proses yang sistematis. Ada proses seperti pengubahan proses digital ke analog, lalu diubah lagi ke digital.

Salah satu contoh prosesnya adalah sebagai berikut. Dari sebuah HTTP diubah melalui TCP, lalu diubah melalui IP. IP adalah bentuk yang cukup sederhana untuk sebuah alamat komputer yang bisa dijalankan di hardware. Dari IP, data diubah menjadi sinyal analog menggunakan hardware seperti ethernet card. Dari ethernet card, sinyal ditransfer melalui kabel, lalu dikirimkan ke komputer lain dan diproses lagi sehingga menjadi data digital yang dapat dibaca oleh komputer. Pemrosesannya dari ethernet card akan melalui IP, TCP, lalu pada akhirnya sampai ke HTTP

1 + 1 gak selalu 2

gimana tuh???

temen2 gw kadang2 gak setuju denger pernyataan ini.

padahal ya, kalo menurut gw, ..

1+1 = 5-3

juga sah kan?

di sd di dago pojok diajarin ini lho…

tp apakah mereka dapet esensinya??

(gw sih gak inget kalo dulu pernah diajarin kalo 1+1 gak selalu 2. tp diajarin kalo 1+1=2)

hehehe

hayoo.. kenapa tu…

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