What is the color of RJ45 port?
It doesn't have standard color, even if it does manufactories don't use it. Usually it's really hard to put something it RJ45 port, unless it's a RJ45 connector.
The ports are available to see on the front and back of your computer. For instance the RJ45 port is the port that you plug in the cable to get to the Internet. If you want to see where the ports are located on the inside, just open your case and you will see them along the back of your computer. For instance, your keyboard is connected to a input port.
If you have a laptop that only has a RJ45 female connector and need to plug in a dial-up modem that uses a RJ11 male connector is it necessary to buy a special adapter for the RJ11 male?
A typical network connection is what's called an RJ45 plug. It looks like a telephone plug but has 8 connectors rather than the 4 that comes on a telephone. The RJ45 plug connects to the network card (provided that the computer is so equipped) and lets you connect to the network. It's possible to get fiber-optic network connectivity, or even use your USB port. Some computers are even equipped with a wireless connection. If yours…
Many routers, incuding all cisco products, use a special cable to carry a terminal session between the serial port of a connected computer and the "console" port of the router (looks like an RJ45 but is wired differently). Cisco includes a custom cable with every router... it is almost alway a flat blue cable with a db9 on one end and an rj45 male on the other. Internally it is a "rollover". Pin 9 goes…
Technically, wireless networking standards are part of the Ethernet family of standards, so what you're really asking about is changing from wireless Ethernet to wired Ethernet. If your computer has a working RJ45 port, all you need is an Ethernet connector cable to connect to a suitable hub or router. If your computer doesn't have that port, you need to install a wired network adapter.