How do I identify Cisco switch ,router and firewall?

There are various ways to identify the switch from a router or a firewall.

1. Look at the model number: Cisco devices have model numbers that indicate the type of device it is. For example, Cisco switches typically have model numbers that start with "SG" or "Cisco Nexus", routers with "ISR" or "ASR" and firewall with "ASA" or "Firepower"

2. Check the interface ports: A switch typically has multiple Ethernet ports, while a router typically has both Ethernet ports and WAN (Wide Area Network) ports, such as serial or T1/E1 ports. Firewall often have both Ethernet and serial ports, but also have additional ports like DMZ and management ports

3. Check the firmware: The firmware version and software running on the device can also indicate the type of device it is. For example, switches typically run IOS (Internetwork Operating System) or NX-OS, routers run IOS or IOS-XE, and firewalls typically run ASA or Firepower OS

4. Check the web interface or command line interface: Cisco devices have their own web interface or command line interface, which can be accessed using a web browser or terminal program. Depending on the device, it will have different options and settings.

It's important to note that the above methods are not definitive, some devices may have additional interfaces or run different firmware versions. It's always good to check the official documentation of the device or consult with the network administrator.