Gigabit Ethernet Managed Switch User Manual
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Black Box Explains...Layer 2, 3, and 4 switching.
The Open Systems Interconnection (OSI) Reference Model provides a layered network design framework that establishes a standard so that devices from different vendors work together.
Layer 2 (The Data-Link Layer)
Layer 2... more/see it nowswitches operate using physical network addresses. Physical addresses, also known as link-layer, hardware, or MAC-layer addresses, identify individual devices. Most hardware devices are permanently assigned this number during the manufacturing process.
Switches operating at Layer 2 are very fast because they’re just sorting physical addresses, but they usually arent very smart.
Layer 3 (The Network Layer)
Layer 3 switches use network or IP addresses that identify locations on the network. Physical addresses identify devices; network addresses identify locations. A location can be a LAN workstation, a location in a computer’s memory, or even a packet of data traveling through a network.
Network addresses are hierarchical. The more details included, the more specific the address becomes and the easier it is to find.
Switches operating at Layer 3 are smarter than Layer 2 devices and incorporate routing functions to actively calculate the best way to send a packet to its destination. However, because Layer 3 Switches take the extra time to read more details of a network address, they are sometimes much slower than Layer 2 Switches.
Layer 4 (The Transport Layer)
Layer 4 of the OSI Model coordinates communications between systems. Layer 4 identifies which application protocols (HTTP, SNTP, FTP, etc.) are included with each packet and uses 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 a packet belongs to.
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 Peoplesoft®, 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. collapse
PoE+ Gigabit Managed Switch Eco User Manual
User Manual for the LPB2810A, LPB2826A, and LPB2848A (Version 1)
Unmanaged Gigabit Switch
The difference between unmanaged, managed, and Web-smart switches
With regard to management options, the three primary classes of switches are unmanaged, managed, and Web smart. Which you choose depends largely on the size of your network and how... more/see it nowmuch control you need over that network.
Unmanaged switches are basic plug-and-play switches with no remote configuration, management, or monitoring options, although many can be locally monitored and configured via LED indicators and DIP switches. These inexpensive switches are typically used in small networks or to add temporary workgroups to larger networks.
Managed switches support Simple Network Management Protocol (SNMP) via embedded agents and have a command line interface (CLI) that can be accessed via serial console, Telnet, and Secure Shell. These switches can often be configured and managed as groups. More recent managed switches may also support a Web interface for management through a Web browser.
These high-end switches enable network managers to remotely access a wide range of capabilities including:
Enabling and disabling individual ports or port Auto MDI/MDI-X.
Port bandwidth and duplex control.
IP address management.
MAC address filtering.
Port mirroring to monitor network traffic.
Prioritization of ports for quality of service (QoS).
802.1X network access control.
Link aggregation or trunking.
Managed switches, with their extensive management capabilities, are at home in large enterprise networks where network administrators need to monitor and control a large number of network devices. Managed switches support redundancy protocols for increased network availability.
Web-smart switches—sometimes called smart switches or Web-managed switches—have become a popular option for mid-sized networks that require management. They offer access to switch management features such as port monitoring, link aggregation, and VPN through a simple Web interface via an embedded Web browser. What these switches generally do not have is SNMP management capabilities or a CLI. Web-smart switches must usually be managed individually rather than in groups.
Although the management features found in a Web-smart switch are less extensive than those found in a fully managed switch, these switches are becoming smarter with many now offering many of the features of a fully managed switch. Like managed switches, they also support redundancy protocols for increased network availability.