Zack Tech Blog

DHCP Go to the router cli enable it configure terminal it ip dhcp pool anyname          //this is to create dhcp pool name can be any network start_ip_address subnet_mask     // from what ip address you want to configure default-router gateway_ip_address     // this is to provide default gateway To exclude the ip address to assign use: ip dhcp excluded-address ip_address

Configuring OSPF  Step 1: Enter Configuration Mode Router>   enable Router#  configure terminal Step 2: Enable OSPF Enable OSPF with a process ID. The process ID is locally significant and can be any number. Router(config)# router ospf <process-Id> Step 3: Set the OSPF Router ID Setting a unique OSPF Router ID is optional but recommended for stability and troubleshooting. The Router ID should be a unique IPv4 address within the OSPF domain. Router(config-router)# router-id <router-id> Step 4: Define Networks to Include in OSPF Specify which networks will participate in OSPF and their corresponding areas. Ensure the areas match across all routers in the OSPF domain. Router(config-router)# network <network-address> <wildcard-mask> area <area-id> Step 5: Save the configuration Router(config-router)# exit Router(config)# do write / do wr Verification Commands View OSPF Neighbors show ospf neighbor View the OSPF Routing Table show ip route ospf View OSPF Pro

 QuickStart Every program must begin with the class name,  and the class must match the filename. Hello world program In above program, First class is created and file is saved as First.java same as class name.              Now, to run the program First.java, we need to compile it and it will run     To compile the java file, open cmd and locate the java file.     Type: javac filename.java     This will compile the java file and class file will be created  Now to run the java file. Type: java filename We can write java code in IDE  such as VS code, Intellj Idea, to write and run the program.

   Variables in Java Variables are the containers to store the data values in the memory.  Variables are naming entities and must follow naming conventions. These rules typically include starting with a letter or underscore, using letters, numbers, or underscores (no spaces or special characters), avoiding reserved keywords, and using naming conventions such as CamelCase or snake_case for readability. These conventions help keep the code organized and understandable.                         Syntax:                                   data_type      variable_name;                                   data_type     variable_name     =     value;         Examples:                                   int myAge = 21;                                   String myName = "Zack";

What is Java?  Java is a popular programming language for developing web, mobile, and desktop applications. It is a high-level and object-oriented programming language. It is platform-independent. It required the Java Virtual Machine(JVM) to run the Java code. Java is similar to C/C++. Application of Java Mobile Application Desktop Application Web Application Embedded System Smart Card Payment System Games History of Java Java's history dates back to the early 1990s when a group of researchers at Sun Microsystems led by James Gosling started a "green project". The goal of this project was to create a portable home-appliance software that could run on embedded processor chips. Initially, the team planned to use C++ programming language for this project. However, they encountered portability issues with C++ and decided to develop a new programming language from scratch. This led to the creation of the Oak programming language, named after an oak tree outside Gosling's o