Difference Between L3 Switch And Router Pdf

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Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. A L2 switch does switching only. This means that it uses MAC addresses to switch the packets from a port to the destination port and only the destination port. A L3 switch also does switching exactly like a L2 switch. The L3 means that it has an identity from the L3 layer. Practically this means that a L3 switch is capable of having IP addresses and doing routing.

The layer 3 vs 2 refers to the OSI model. A layer 3 switch supports routing. A layer 2 switch only knows ethernet, you may be able to setup VLANs. Otherwise, the packet is bridged layer 2 behavior on all the same vlan ports. Or, on separate sets of ports of the switch some ports as L2 ports while some ports as L3 ports : A set of "x" ports on a switch may be configured as a bridge and will bridge packets.

While, another set of "y" ports may have IP addresses assigned to them and will act as router ports routing received IP packets. Layer 2 is generally hardware i. Layer 3 has to do with ip's. Layer 3 devices are usually managed and they can create and route between vlans.

Sign up to join this community. The best answers are voted up and rise to the top. Asked 10 years, 11 months ago. Active 4 years, 6 months ago. Viewed k times. I've always wondered and never needed to know until now.

Improve this question. Jon Rhoades Jon Rhoades 4, 3 3 gold badges 28 28 silver badges 46 46 bronze badges. See the related question serverfault. Add a comment. Active Oldest Votes. I will complete Zoredache's answer. Improve this answer. Antoine Benkemoun Antoine Benkemoun 7, 3 3 gold badges 39 39 silver badges 60 60 bronze badges. So if a L3 switch had two hosts on separate VLANs it could route between them rather than going through a router? Most with routing can. If you've got a lot of L2 vlans, which overlay L3 subnets, then you needed something called a one armed router aka router on a stick.

Thus, if you had a lot of intra vlan traffic then this would be come the bottle neck. L3 switches can fulfil this job. Zoredache Zoredache k 35 35 gold badges silver badges bronze badges. Adding to that a layer 2 switch normally does hardware routing. It basically sets up a hardware switch module based on bytes in the ethernet packet for "switching the packets according to route".

Some of those get pretty powerfull looking at the direction of Extreme Networks. A switch can be thought of as a more powerful bridge and a less powerful router. If a switch is configured to work only as a bridge, it is called a layer 2 switch. If a switch is configured to work only as a router, it is called a layer 3 switch.

A switch configured as a bridge would be working at layer 1, not 2. A switch working only as a router would be a router, not a switch As per Wikipedia page on this topic, "bridge" operates at layer 2.

So, a switch configured as a "bridge" will be a layer 2 switch. If you go through the data sheets of the different switches manufactured by Juniper Networks eg, ex , ex, ex, ex, etc or Cisco, you will find all the layer 3 functionality available including routing protocols like rip, ospf, isis, bgp. So, most switches, these days, do operate at layer 3. All IP packets passed over the Ethernet among the intermediate hops are encapsulated in Ethernet header.

DMAC is present in the Ethernet header. So, a layer 3 switch behaves in the same way. This isn't all necessarily true and has already been covered by previous answers. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

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Layer 3 Switch Vs Router: What Is Your Best Bet?

Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. A L2 switch does switching only. This means that it uses MAC addresses to switch the packets from a port to the destination port and only the destination port. A L3 switch also does switching exactly like a L2 switch. The L3 means that it has an identity from the L3 layer. Practically this means that a L3 switch is capable of having IP addresses and doing routing.

Your solution lies in networking tools such as a router or switch. Both these devices are helpful for the cause and will help you remain connected as you go through your day to day work at office, shop, home, or any other commercial establishment. The questions related to what is a router, what is a switch, definition, and function of routers and switches, the difference between a router and switch, are quite common in interviews. Through this article, we aim to help you get a fair idea about the functions of a switch and router, a comparative study of router and switch, and how they can be of use to you. Read on for more! A router is used for forwarding data packets across linked networks. Routers are situated at the gateway where multiple networks merge to connect.


The key distinction between Layer-3 switches and routers lies within the hardware technology accustomed build the unit. The hardware within a.


difference between switch and router pdf

In the networking world, term like layer 3 switch and router gets thrown around often — both are seeing broad deployment in network data transmission. We may get confused regarding layer 3 switch vs router: they bear much similarities as they both support the same routing protocols, inspect incoming packets and make dynamic routing decisions based on the source and destination addresses inside. But they also differ in performance, flexibility, cost and etc.

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Difference between Switch and Router with Comparison Chart

The term Layer 2 is adopted from the Open System Interconnect OSI model, which is a reference model for explaining and describing network communications. Switches and bridges are mostly used for Layer 2 switching. They help to break up large size collision domain into separate smaller ones. They interconnect networks at layer 2, mostly at the MAC sub-layer, and operate as bridges.

Routers : Routers are the connecting devices in networking. Layer-3 Switches : Layer-3 Switches were formed as a technology to boost on the performance of routers utilized in massive native space networks LANs like company intranets. The key distinction between Layer-3 switches and routers lies within the hardware technology accustomed build the unit. Layer-3 switches typically value but ancient routers. Designed to be used among native networks, a Layer-3 switch can usually not possess the WAN ports and wide space network options a conventional router can perpetually have.

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Layer-3 devices, as routers process logical addressing information in the. Network header of a Hubs do not differentiate between frame types, and thus will.


Key Difference Summary –

The switch can only share a network connection. The router works in the network layer of the OSI model. Similarly, routers are identified as Layer-3 devices, as routers process logical addressing information in the Network header of a packet such as IP addresses. The router is a routing device. Hence, a switch is a layer 2 device while a router is a layer 3 device. Routers use headers and forwarding tables to determine the best path for forwarding the packets, and they use protocols to communicate with each other and configure the best route between any two hosts. HUB Hub is known as the most simplest amongst these device In general, hub is the central part of a wheel where the spokes come together.

A router, like a switch forwards packets based on address. So again, what is the difference between an Ethernet router and an Ethernet switch? Your modem acts as the bridge between your LAN local area network and the Internet. In an ethernet network there are 4 devices that from the the outside look very similar. Unlike a router, a switch only sends data to the single device it is intended for which may be another switch, a router, or a user's computer , not to networks of multiple devices.

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4 Response
  1. Brent S.

    Generally speaking, a layer 3 switch connects hosts to form local area networks (LANs) while routers connect multiple LANs into wide area networks (WANs).

  2. Favor T.

    Hardware/Software decision making – The key difference between Layer 3 switches and routers lies in the hardware technology used to making forwarding​.

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