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Content Tagged with address + network

Layer 2 switch is A network device that forwards traffic based on MAC layer (Ethernet or Token Ring) addresses.

Bridging technology has been around since the 1980s (and maybe even earlier). Bridging involves segmentation of local-area networks (LANs) at the Layer 2 level. A multiport bridge typically learns about the Media Access Control (MAC) addresses on each of its ports and transparently passes MAC frames destined to those ports. These bridges also ensure that frames destined for MAC addresses that lie on the same port as the originating station are not forwarded to the other ports. For the sake of this discussion, we consider only Ethernet LANs.

Layer 2 switches effectively provide the same functionality. They are similar to multiport bridges in that they learn and forward frames on each port. The major difference is the involvement of hardware that ensures that multiple switching paths inside the switch can be active at the same time.

There are three distinct functions of layer 2 switching

1)address learning

2)forward/filter decisions

3)loop avoidance

Address learning

Layer 2 switches and bridges remember the source hardware address of each
frame received on an interface, and they enter this information into a MAC database called a forward/filter table.

Forward/filter decisions

When a frame is received on an interface, the switch looks at the destination
hardware address and finds the exit interface in the MAC database. The frame is only
forwarded out the specified destination port.

Loop avoidance

If multiple connections between switches are created for redundancy purposes,
network loops can occur. Spanning Tree Protocol (STP) is used to stop network loops
while still permitting redundancy.

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Public IP Addresses

What is Public IP address

Public IP Addresses (also known as Static IP Addresses) are IP addresses that are visible to the public.Because these ip addresses are public, they allow other people to know about and access your computer, like a Web server.In some cases, you do not want people to access your computer or you want to restrict certain individuals from accessing your computer or server.

Private IP Addresses

What is Private IP address

These addresses can be used on a private network, but they’re not routable through the public Internet. This not only creates a measure of much-needed security, but it also conveniently saves valuable IP address space.

Current Private IP addresses as follows

Class A

10.0.0.0 through 10.255.255.255

Class B

172.16.0.0 through 172.31.255.255

Class C

192.168.0.0 through 192.168.255.255