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TechnologyCisco Router modes: Different Types of Interfaces on Cisco Routers

Cisco Router modes: Different Types of Interfaces on Cisco Routers

Today, we are going to discuss Cisco Router modes: Different Types of Interfaces on Cisco Routers

For managing routers, both console ports and the auxiliary port are used. LAN and WAN communication ports are also included on routers. Ethernet, Fast Ethernet, Giga Ethernet, Fiber Distributed Data Interface (FDDI), and Token Ring are the most common LAN interfaces. The description of each type of Cisco router interface is provided below.


The physical interface of a router is normally based on the IEEE 802.3 standard. The port’s working speed is 10 Mbps. The 10BaseT media standard is used for this interface.

Fast Ethernet

The FE interface is another name for Fast Ethernet. Its physical interface is based on the IEEE 802.3u standard. Fast Ethernet operates at 100 Mbps. The Fast Ethernet interface uses the 100BaseT media standard.

Gigabit Ethernet

GE interface is another name for gigabit Ethernet. IEEE 802.3ab is the Ethernet port standard. Gigabit Ethernet connections can be made at the astounding rate of 1000 mb/s. The employed media standard is 1000BASE-T.

Serial interfaces

A serial interface is a channel for data transmission between two digital systems that sends voltage pulses along a wire. Serial interfaces are frequently employed for WAN communications between an ISP and a host. Frame Relay, T1, T3, and other connectivity types are offered through the serial interface.

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A collection of ANSI and ISO standards called FDDI (Fiber Distributed Data Interface) governs data transfer over fibre optic connections in a local area network (LAN). The FDDI’s range can be increased to 200 km. FDDI networks use a token-passing mechanism and run at a speed of 100 Mbps to avoid collisions.

Token Ring

One or more logical tokens are passed from host to host in a token ring network, which is a local area network (LAN) made up of all linked computers in a ring or star topology. Tokens can only be sent by hosts that have them, and they are only issued when receipt of the data has been verified. Interfaces for Token Ring can run at speeds of 4 Mbps or 16 Mbps. Token-ring networks were absent from the networking market for a very long time. There is no Token Ring interface on modern Cisco routers.

Loopback interface

In a Cisco router, a loopback interface is a logical, virtual interface. Unlike the Fast Ethernet or Gigabit Ethernet interfaces, this interface is not physical. One significant application for a loopback interface is as an OSPF router ID.

Null Interface

A virtual interface that ignores IP packets is called a null interface. Its purpose is to shield the network against routing loops. We don’t provide a null interface or an IP address.

Cisco Router modes

A layer 3 device called a router is used to transmit packets from one network to another. Based on the destination IP address and the entry in the routing table, it passes the packet through one of its ports. It locates an ideal path between the source and destination networks by using a routing table.

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Router modes: The router has five primary modes:

User execution mode

After the interface up message appears, press Enter to bring up the router> prompt.”User execution mode” is what it’s known as. Some monitoring commands can only be used in this mode.

Privileged mode

When we type enable into user mode, we enter privileged mode, which allows us to examine and modify the router’s configuration. Several commands, like show running-configuration and show IP interface brief, among others, can be used in this mode for troubleshooting.

Global configuration mode

When we enter configure terminal into user mode, the global configuration mode is activated.Global commands, which are entered in these modes, have an impact on the router’s operational configuration. In this mode, various configurations can be made, such as creating a local database on the router and setting an enable and secret password, etc.

Interface configuration mode

Only interface configuration is carried out in this mode. The typical actions carried out in this mode include setting up the interface and assigning an IP address to it.


When we pause the router’s booting process, we may access the ROMMON mode. Typically, we enter this mode when recovering lost passwords or backing up iOS on TFTP servers. It resembles a computer’s BIOS mode.


How many interfaces does a router have?

The majority of switches are routers, or layer 3 switches. Many business routers only have 2 or 3 ports because most businesses don’t require more. In this instance, the router has an “inside” interface that is normally connected to a layer 2 switch and an “outside” interface that is connected to the Internet.

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What exactly do router interfaces do?

The port through which a router connects to a specific network.The port on the router that is directly connected to the network for a given network is referred to as the local router interface, and any other port on the router that is connected to another network is referred to as the remote router interface.

How many different types of Cisco routers exist?

Consider the numerous interface types available on Cisco routers.

According to the various application categories, there are five different types of routers available. They include VPN routers, core routers, edge routers, wireless routers, and wired routers.

On a Cisco router, how can I view every interface?

Information for all interface types will be displayed if you execute the show interfaces command on a Cisco 7200 series router without the slot or port parameters. You will get information for all ethernet, serial, Token Ring, and FDDI interfaces, for instance, if you type “display interfaces ethernet.”

Which four types of interfaces are there?

Command-line interface (CLI), graphical user interface (GUI), and menu-driven user interface touch-screen interface

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