How many interfaces A router can have?
An IP address is assigned to each of the router’s two “interfaces”. The first router interface is called the WAN (Wide Area Network) interface. This is the side of the router that faces the Internet and has a public IP address. The second router interface is called the LAN (Local Area Network) interface.
Why does a router have multiple interfaces?
The short answer is: Yes. By definition, a router must have more than one interface (with an IP address per interface) to send and receive packets and forward packets from one to the other based on the destination addresses of the packets.
Can we create VLAN on router?
You can configure the software to allow traffic on a VLAN to be treated as if the VLAN were a router port. A port can be either a VLAN port or a router port, but not both. However, a VLAN port may be part of a VLAN that is itself a router port. Section , Configuring VLAN Routing via Web Interface.
What kind of interfaces does a router have?
The router in the figure has four interfaces. Each interface has a Layer 3 IP address and subnet mask that configures it for a different network. The Ethernet interfaces also have Layer 2 Ethernet MAC addresses. The WAN interfaces are using different Layer 2 encapsulations. Serial 0/0/0 is using HDLC and Serial 0/0/1 is using PPP.
Why are there so many ports in a router?
A router has multiple ports, in turn, each port is a network interface. When we talk about a network interface, we refer to the hardware component that allows a device to connect to any network. Consequently, a router has multiple network interfaces, that is, several network cards packed into a single device.
Can you have two Cisco router interfaces on the same network?
Cisco IOS will not allow two active interfaces on the same router to belong to the same network. As the name indicates, LAN interfaces are used to connect the router to the LAN, similar to how a PC Ethernet NIC is used to connect the PC to the Ethernet LAN.
What do you need to know about a Cisco router?
However, you need to perform some basic Cisco router configuration before the basic router will start routing packets. In particular, the router needs to be told what interfaces (and which IP address on each of those interfaces) to use. Routers play a key role in enterprise networks because they connect the organization’s devices to the internet.