When would you use a layer 2 switch?

When would you use a layer 2 switch?

Layer 2 switches are generally used in combination with routers to create larger networks. Layer 2 switches are used for creating LAN segments, while the routers provide higher-level functions such as providing wide-area access or protocol translation.

Which impact does adding a layer 2 switch?

Which impact does adding a Layer 2 switch have on a network? Explanation: Adding a Layer 2 switch to a network increases the number of collision domains and increases the size of the broadcast domain.

What is Layer 2 switching in networking?

Switches are one of the traffic directors on the network, and traditionally operate at Layer 2. They allow for the connection of multiple devices in a LAN while decreasing the collision domain by employing packet switching.

What are the characteristics of Layer 2 switches?

Does LAYER-2 Switches forward traffic addressed to hosts that reside on a different collision domain. Layer 2 Switches separate multicast domains. Layer 2 Switches forward broadcast traffic.

How does a layer 2 switch differ from a router?

How does a layer-2 switch differ from a router? A layer-2 switch operates at the data link layer, and a router operates at the network layer.

Why is Layer 2 security so important?

Because any user can gain access to any Ethernet port and be a potential hacker, open campus networks cannot guarantee network security. Because the OSI model was built to allow different communications layers to work without knowledge of each other, Layer 2 security is critical.

Why switching is faster than routing?

In a LAN environment, a switch is faster than Router. In Router, every port has its own broadcast domain. The switch has one broadcast domain except VLAN implemented. Router operations revolve around IP Addresses.

Can a Layer 2 switch be hacked?

Data Link layer is considered as the weakest link in a secured network. If an initial attack comes in at Layer 2, the whole network can be compromised.

What are the layer 2 switch security controls?


  • Securing Layer 2.
  • Port-Level Traffic Controls.
  • Private VLAN (PVLAN)
  • Access Lists on Switches.
  • Spanning Tree Protocol Features.
  • Dynamic Host Configuration Protocol (DHCP) Snooping.
  • IP Source Guard.
  • Dynamic ARP Inspection (DAI)

What are the 3 main functions of Layer 2 switching?

There are three distinct functions of layer 2 switching (you need to remember these!): address learning, forward/filter decisions, and loop avoidance.

What is the difference between Layer 2 and Layer 3 switches?

Layer2 is the process of using devices and MAC addresses on a LAN to segment a network. A Layer 3 switch is a switch that performs routing functions in addition to switching. Layer 2 switches perform the switching function to re-arrange the data frames from the source to its destination network.

What is better switch or router?

A router can take a routing decision much faster than a switch. It provides only port security. It provides security measures to protect the network from security threats. It comes in the category of semi-Intelligent devices.

Why is Layer 2 considered as the weakest link in securing a network?

Security is only as strong as the weakest link in the system, and Layer 2 is considered to be that weak link. This is because LANs were traditionally under the administrative control of a single organization. We inherently trusted all persons and devices connected to our LAN.

Can a layer 2 switch be hacked?

What is layer 2 switching?

Layer 2 switching (or Data Link layer switching) is the process of using devices’ MAC addresses on a LAN to segment a network. Switches and bridges are used for Layer 2 switching. They break up one large collision domain into multiple smaller ones. In a typical LAN, all hosts are connected to one central device.

Why are Layer 2 switches faster than routers?

Layer 2 switches are faster than routers because they don’t take up time looking at the Network layer header information. Instead, they look at the frame’s hardware addresses to decide what to do with the frame – to forward, flood, or drop it. Here are other major advantages of Layer 2 switching:

What are the benefits of Ethernet at Layer 2?

If more of the end-to-end transfer of information from a source to a destination can be done in the form of Ethernet frames, more of the benefits of Ethernet can be realized on the network. Networking at Layer 2 can be a powerful adjunct to IP networking, but it is not usually a substitute for IP networking.

What is the difference between Layer 2 and Layer 3?

Layer 2 networks work for IP packets and all other Layer 3 protocols. More layers added to the Ethernet frame only slow the networking process down (“nodal processing delay”). Adjunct networking features such as class of service (CoS) or multicasting can be added to Ethernet as readily as IP networks.