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Sunday, 28 July 2019

Layer 4 Switch

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Layer 4 Switches:

Layer 4 of the OSI Model coordinates communications between systems. Layer 4 (The Transport Layer) switches are capable of identifying which application protocols (HTTP, SNTP, FTP, and so forth) are included with each packet, and they use this information to hand off the packet to the appropriate higher-layer software. Layer 4 switches make packet-forwarding decisions based not only on the MAC address and IP address, but also on the application to which a packet belongs.

Because Layer 4 devices enable you to establish priorities for network traffic based on application, you can assign a high priority to packets belonging to vital in-house applications, such as e-mail and video conferencing, with different forwarding rules for low-priority packets such as generic HTTP-based Internet traffic. Layer 4 switches also provide an effective wire-speed security shield for your network because any company-or industry-specific protocols can be confined to only authorize switched ports or users. This security feature is often reinforced with traffic filtering and forwarding features.

Speed vs. Capability:

As the layers increase in switches, so does the CPU power and processing time (latency) of the switch. The trade-off for more control and capabilities in a higher layer switch is less speed and increased power consumption. Lower layer switches are faster and use less processing power. Choosing a switch that matches your network needs creates maximum networking efficiency

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