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In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. [ 1 ] [ 2 ] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet , [ 3 ] or between several VLAN s.
Network topology is the arrangement of the elements (links, nodes, etc.) of a communication network. [1] [2] Network topology can be used to define or describe the arrangement of various types of telecommunication networks, including command and control radio networks, [3] industrial fieldbusses and computer networks.
Firewall dual-homing provides the first-line defense and protection technology for keeping untrusted bodies from compromising information security by violating trusted network space. A dual-homed host (or dual-homed gateway [ 2 ] ) is a system fitted with two network interfaces (NICs) that sits between an untrusted network (like the Internet ...
3 Network Topology. 4 Layer 2.5. 5 Layer 3 (Network Layer) 6 Layer 3+4 (Protocol Suites) 7 Layer 4 (Transport Layer) 8 Layer 5 (Session Layer) 9 Layer 6 (Presentation ...
Based on the most commonly deployed network topology of systems within a data center, north–south traffic typically indicates data flow that either enters or leaves the data center from/to a system physically residing outside the data center, such as user to server.
Network Enclaves consist of standalone assets that do not interact with other information systems or networks. A major difference between a DMZ or demilitarized zone and a network enclave is a DMZ allows inbound and outbound traffic access, where firewall boundaries are traversed. In an enclave, firewall boundaries are not traversed.
Traditionally, many data centers today deploy their systems using a fat-tree or CLOS topology. In this network topology, servers and appliances that host applications are deployed within the racks. There is a top of the rack (ToR) switch (a leaf switch) that connects the systems within the rack as well as to other spine switches.
A single firewall with at least 3 network interfaces can be used to create a network architecture containing a DMZ. The external network is formed from the ISP to the firewall on the first network interface, the internal network is formed from the second network interface, and the DMZ is formed from the third network interface. The firewall ...