What is Layer 2 configuration?

You can configure Layer 2 switching ports as access or trunk ports. Trunks carry the traffic of multiple VLANs over a single link and allow you to extend VLANs across an entire network. All Layer 2 switching ports maintain MAC address tables.

Can you configure a Layer 2 firewall?

Single Layer 2 Firewall example Using the Layer 2 Firewall makes it possible to implement access control for any Ethernet protocols between switches within the same network segment. There is no need to change the network topology.

What are the layer 2 switch security controls?

Contents

  • 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)

How do I configure a Layer 2 port channel?

When configuring Layer 2 EtherChannels, follow these guidelines:

  1. Assign all ports in the EtherChannel to the same VLAN, or configure them as trunks.
  2. If you configure an EtherChannel from trunk ports, verify that the trunking mode (ISL or IEEE 802.1Q) is the same on all the trunks.

Can a Layer 2 switch have VLANs?

Layer 2 Switch—Switching Layer for OSI Model By looking at the destination MAC address in the frame header, the Layer 2 switch interconnects multiple end nodes of VLAN and intelligently forwards traffic between them without unnecessary flooding of frames onto the network.

How do I configure a VLAN on a Cisco Layer 2 switch?

Layer 2 VLAN Configuration on a Cisco Switch (with Example)

  1. Accounting Department: IP Subnet 192.168. 2.0/24 –> VLAN 2.
  2. Management Department: IP Subnet 192.168. 3.0/24 –> VLAN 3.
  3. Engineering Department: IP Subnet 192.168. 4.0/24 –> VLAN 4.

What is the difference between network Layer 2 and 3?

The layer 2 and Layer 3 differs mainly in the routing function. A Layer 2 switch works with MAC addresses only and does not care about IP address or any items of higher layers. Layer 3 switch, or multilayer switch, can do all the job of a layer 2 switch and additional static routing and dynamic routing as well.

Is firewall a Layer 2 or 3?

A firewall generally works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function. Many firewalls today have advanced up the OSI layers and can even understand Layer 7 – the Application Layer.

Why is security on a Layer 2 switch 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.

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

A Layer 2 switch only works with MAC addresses and doesn’t interact with any higher layer addresses, like an IP. A Layer 3 switch, on the other hand, can also do static routing and dynamic routing, which includes IP and virtual local area network (VLAN) communications.

What is a Layer 2 port channel?

A layer2 etherchannel is seen as a single link by STP allowing to use all the member links for better performance. Most of the times a layer2 etherchannel is configured as a trunk ( 802.1Q more often) and can carry multiple Vlans/broadcast domains.