Computer Network Gateways
By Stephen Bucaro
When networks with different protocols, such as Ethernet and Token Ring need to be connected
together, this requires reconstruction of the data packets. To do this, information from above
the network layer is required. A gateway is a device that can function at all seven layers of
the OSI model. A gateway can connect a LAN to a WAN, a LAN to a mainframe, translate protocols,
or convert transmission media.
A router that connects a local subnet to other networks is called a "default gateway".
A gateway that connects a LAN to the Internet is called a "proxy server" when it receives all
requests for Internet access from the LAN and routes them to the Internet. A gateway that
connects a LAN to the Internet is called a "firewall" when it provides security and protection
against external intrusions.
More Networking Protocols and Standards:
• Remote Control Protocols
• An Introduction to the Types of VPNs
• The OSI Application Layer
• A Simple Description of the IPv6 Header and Datagram
• NTP Server Systems - The Network Time Protocol
• Active Directory : How Objects Are Stored and Identified
• The OSI Data Link Layer
• Wireless Standards - 802.11a 802.11b 802.11g 802.11n 802.11i Explained
• Comparison of the Layers of the OSI and TCP/IP Models
• Video - Network Layer (Layer 3) of OSI Networking Model
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