Day: September 21, 2021

Model 2 State (Sistem Operasi)

Posted on by Ilham

 Introduction

Sistem operasi bertanggung jawab untuk mengatur pengeksekusian proses yang meliputi pengaturan pola pengalihan proses dan alokasi sumber daya untuk proses tersebut.  Langkah pertama untuk mndesain sebuah OS yang dapat mengontrol proses adalah mendeskripsikan sifat2/prilaku dari proses.  Kita dapat menkonstruksi pemodelan untuk mendeskripsikan manajemn proses yang trjadi pada sistm operasi. Kita mulai dengan model yang paling sederhana yaitu model 2 state sampai dengan model 7 state. 

Model 2 State

Model yang paling sederhana adalah model 2 state yang terdiri dari 2 buag status yaitu running dan not running. Pada saat OS menciptakan proses baru, maka akan dibuat PCB nya dan poses masuk kedalam sistem dengan status not running. Proses tersebut menunggu sampai mendapat kesempatan diproses oleh CPU. Proses tersebut mendapat kesempatan dieksekusi bila proses yang sedang berjalan diinterupsi

Referensi

-William Stallings. Hak Cipta © 2001. Operating Systems. Prentice Hall.

Cara Akses Mikrotik Melalui PUTTY (SSH)

Posted on by Ilham

Pendahuluan 

Perangkat Mikrotik dapat diakses dengan menggunakan berbagai media, dan salah satunya yaitu menggunakan putty.
Mikrotik bisa kita akses langsung via console/shell maupun remote akses menggunakan PUTTY (www.putty.nl). Caranya tinggal masukkan alamat IP Mikrotik ke kolom Host Name nya PuTTY. sebelum akses melalui putty pastikan ip address pada router di mikrotik sudah di setting. apabila default maka ip nya 192.168.88.1

Tips Command : “Manfaatkan auto complete” (mirip bash auto complete di linux) Tekan Tombol TAB di keyboard untuk mengetahui/melengkapi daftar perintah selanjutnya. Jadi perintah yang panjang tidak perlu kita ketik lagi, cukup ketikkan awal perintah itu, lalu tekan TAB-TAB maka otomatis Shell akan menampilkan/melengkapi daftar perintah yang kita maksud.

Cukup ketikkan Ip Add >>> lalu tekan TAB >>> maka otomatis shell akan melengkapi menjadi Ip address dan tambahkan print. 

Lalu ketik “..” (titik dua) untuk kembali ke sub menu diatasnya, dan ketik “/“ untuk kembali ke root menu.

IP Address and Subnetting (English)

Posted on by Ilham

Introduction 

An IP address is an address used to uniquely identify a devices such as computer,server and printers on an IP network. The address is made up of 32 binary bits which can be divisible into a network portion and host portion with the help of a subnet mask. The 32 binary bits are broken into four octets (1 octet = 8 bits). Each octet is converted to decimal and separated by a period (dot). IP address divided into different classes. Class A (1.0.0.0-127.255.255.255), Class B (128.0.0.0-191.255.255.255), Class C (192.0.0.0-223.255.255.255), Class D (224.0.0.0-239.255.255.255), class D, Class E and Classless Inter-domain Routing (CIDR).
  • Class A—The first octet (8bits) denotes the network address, and the last three octets (24bits) are the host portion. Any IP address whose first octet is between 1 and 126 is a Class A address. Note that 0 is reserved as a part of the default address, and 127 is reserved for loopback.
  • Class B—The first two octets (16 bits) denote the network address, and the last two octets (16 bits) are the host portion. Any address whose first octet is in the range 128 to 191 is a Class B address.
  • Class C—The first three octets (24bits) denote the network address, and the last octet (8bits) is the host portion. The first octet range of 192 to 223 is a Class C address.
  • Class D—Used for multicast. Multicast IP addresses have their first octets in the range 224 to 239.
  • Class E—Reserved for future use and includes the range of addresses with a first octet from 240 to 255.
And subnetting
By subnetting you will be able to create multiple logical networks in a single physically connected networks (a single Class A, B, or C network). If you do not have subnet, you are only able to use one network from your desired Class A, B, or C network, for example 10.143.8.1 – 00001010.10001111.00001000.00000001 255.255.255.128- 11111111.11111111.11111111.10000000 If you count number of 1 in the bitmask you will get total 25. So the mask of 255.255.255.128 can also be denoted as /25 as there are 25 bits that are set in the mask. There is another method called CIDR. Classless Interdomain Routing (CIDR) was introduced to improve both address space utilization and routing scalability in the Internet. CIDR moves way from the traditional IP classes (Class A, Class B, Class C, and so on). In CIDR , an IP network is represented by a prefix, which is an IP address and some indication of the length of the mask. one of these networks can be described with the notation prefix/length. For example, 10.0.0.0/25 denotes the network 10.0.0.0 255.255.255.128 CIDR also depicts a more hierarchical Internet architecture, where each domain takes its IP addresses from a higher level. This allows for the summarization of the domains to be done at the higher level. For example, if an ISP owns network 203.17.0.0/16, then the ISP can offer 203.17.1.0/24, 203.17.2.0/24, and so on to their clients.
You can see on this picture for subnetting

You can use calculator to make sure for the subnetting and host 

Source : 

– Cisco
– Source 2

Simulasi Sidang ~ Live Video

Posted on by Ilham

 Pada kali ini saya akan share simulasi sidang bersama bapak Muhammad Rizqy Alfarisi, S.ST, M.T selaku pembimbing ke 2 saya.

berikut video nya :

Disini adalah video seminar proposal namun dalam keadaan terpisah jadi pembimbing 1 khusus , lalu untuk pembimbing ke 2 harus sendiri-sendiri, maaf maaf ya dalam videonya saya agak kurang bagus karena saya gugup bet wkwkwkwk……. semoga jadi pembelajaran aja ya buat menghadapi sidang atau sempro nya intinya jangan takut , harus dalam keadaan tenang.

Ilham Idfiana