Community Interfaces and Ports – Is There Any Change?


In excess of the lengthy course of my occupation I have read quite a few of my colleagues refer to these two terms interchangeably, despite the fact that this is basically not true and may perhaps price you a erroneous answer on an exam such as Cisco’s CCNA or CCNP which could make the difference involving you passing the examination or not. Permit us consider a glance at the variations in these two conditions.


The Port resides at layer 1 of the OSI design, the Bodily layer. This layer defines the electrical and actual physical specs for a gadget, these as copper or fiber media as properly as the voltages, line impedance, signal timing, and the actual physical layout of pins for the connecting device this kind of as twisted pairs, coaxial or in the case of fiber cable solitary manner or multi-method.


The Interface resides at layer 2 of the OSI design, the Data Url layer. This layer defines the useful and procedural system of transferring information between community gadgets, this kind of as Serial, Ethernet, FDDI, and Token-Ring. Moreover this layer might offer the ability to detect and perhaps appropriate mistakes that may possibly happen at the bodily layer.

Digital Interfaces:

There are a amount of interfaces that have no bodily link to any system this kind of as Loopbacks, Lines, and VLANs. These interfaces are referred to as digital interfaces, and whilst these interfaces have no physical connection they can still be resolved and accessed by other equipment in a network. Interfaces such as Loopback interfaces are very helpful in insuring equipment are reachable with many routing protocols.

Sub interfaces are an additional variety of digital interface and are made use of in WAN connections like Body-Relay, and VLAN Trunks between routers and switches when generating a router on a adhere to route among VLANs or deploying DHCP addressing for various VLANs.

In conclusion the line concerning Ports and Interfaces could be blurry, and in the actual world the two conditions may well be utilized interchangeably but there is a distinction and you need to have to fully grasp the variance not only to move an exam, but to enable you effectively configure community interfaces on Cisco routing and swap equipment and support you troubleshoot some sophisticated networking problems. A good way to don’t forget this is you use some kind of media to bodily link a community port to an additional network system port and you configure a network interface with some kind of protocol to enable communication concerning network units on a LAN or WAN.

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