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# Switch   *It is a network devices.   *It works at layer 2 of OSI Model.   *It is used to connect more than one end devices for sharing purpose, security, etc.  # Ma nageable Switch: Those switches which can be configured by administrator i.e., administrator can modify the default configuration of switch. They have a console port. # Unma nageable Switch: Those switches which cannot be configured by administrator. They already have a default configuration. They don't have a console port. Setting Passwords Five passwords are used to secure your Cisco Switch: console, auxiliary, telnet (VTY), enable password, and enable secret. The enable secret and enable password are used to set the password that’s used to secure privileged mode. This will prompt a user for a password when the enable command is used. The other three are used to configure a password when user mode is accessed through the console port, through the auxiliary port, or via Telnet. 1. Enable Passw

Java Java is a programming language and a computing platform for application development. It was first released by Sun Microsystem in 1995 and later acquired by Oracle Corporation. It is one of the most used programming languages. Java Platform Java platform is a collection of programs that help to develop and run programs written in the Java programming language. Java platform includes an execution engine, a compiler, and a set of libraries. JAVA is platform-independent language. It is not specific to any processor or operating system. To understand JAVA programming language, we need to understand some basic concept of how a computer program can run a command and execute the action. PC A computer is an electronic device capable of performing computations, and we all know that it is composed of a monitor, keyboard, mouse, and memory to store information. But the most important component of the computer is a PROCESSOR. Which does all thinking of computer, but

CCNA is a popular certification course among computer network engineers. It is estimated that more than 1 million CCNA certificates have been awarded since it was first launched in 1998. The CCNA certificate covers a broad range of networking concepts. It helps candidates to prepare for the latest network technologies they are likely to work on. What is CCNA? Cisco Certified Network Associate often known as CCNA. It is an IT network certification course offered by Cisco. It is a certification program valid for all type of engineers. It includes entry-level network engineers, Network Administrators, Network Support Engineers and Network Specialists. Some of the common topics covered under CCNA certification include: OSI models IP addressing WLAN and VLAN Network security and management (ACL included) Routers / routing protocols ( EIGRP, OSPF, and RIP) IP Routing Network Device Security Troubleshooting Note that Cisco certification is valid only for 3 year