Network is a 1976 American satirical drama film produced by Metro-Goldwyn-Mayer, released by United Artists, written by Paddy Chayefsky and directed by Sidney Lumet. It is about a fictional television network, the Union Broadcasting System (UBS; sometimes referred to as "UBS-TV";[3] situated in the film as the "fourth television network" after NBC, CBS, & ABC), and its struggle with poor ratings. The film stars Faye Dunaway, William Holden, Peter Finch (in his final film role), Robert Duvall, Wesley Addy, Ned Beatty, and Beatrice Straight.

Seeking another hit, Christensen cuts a deal with a terrorist group called the Ecumenical Liberation Army (ELA) for a new docudrama series, The Mao Tse-Tung Hour, for which the ELA will provide exclusive footage of their activities. Meanwhile, Beale discovers that Communications Corporation of America (CCA), the parent company of UBS, will be bought out by a larger Saudi conglomerate. He urges his audience to pressure the White House to quash the deal. This panics UBS because the network's debt load has made the merger essential for its survival. CCA chairman Arthur Jensen arranges a meeting with Beale, describing the interrelatedness of the participants in the international economy and the illusory nature of nationality distinctions. Jensen persuades Beale to abandon his message and preach his new "evangel".


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A system of computers and peripherals, such as printers, that are linked together. A network can consist of as few as two computers connected with cables or millions of computers that are spread over a large geographical area and are connected by telephone lines, fiberoptic cables, or radio waves. The Internet is an example of very large network. See more at LAN WAN.

A computer network is a group of interconnected nodes or computing devices that exchange data and resources with each other. A network connection between these devices can be established using cable or wireless media. Once a connection is established, communication protocols -- such as TCP/IP, Simple Mail Transfer Protocol and Hypertext Transfer Protocol -- are used to exchange data between the networked devices.

Devices attached to a computer network use IP addresses that are resolved into hostnames through a domain name system server to communicate with each other over the internet and on other computer networks. A variety of protocols and algorithms are also used to specify the transmission of data among endpoints.

Network systems must follow certain standards or guidelines to operate. Standards are a set of data communication rules required for the exchange of information between devices and are developed by various standards organizations, including IEEE, the International Organization for Standardization and the American National Standards Institute. For example, the Ethernet standard establishes a common communication language for wired or physical networks, and the 802.11 standard specifies connectivity for wireless local area networks (WLANs).

A computer network must be physically and logically designed in such a way that makes it possible for the underlying network elements to communicate with each other. This layout of a computer network is known as the computer network architecture.

A well-defined computer network also takes network capacity into account. A network's capacity is how much traffic the network can support at any given time, while still meeting service-level agreements. It's measured in terms of bandwidth, which is quantified by the theoretical maximum number of bits per second that can pass through a network device.

There are several types of computer networks. Which network an organization uses depends on factors such as the number of devices, types of operating systems, transmission medium used, network topology, the distance between each device and their geographic scale.

A network topology is the physical and logical arrangement of a network. All topologies come with different pros and cons. Organizations should consider the scope of a network -- including its size, scaling needs and business goals -- before selecting a particular topology.

If you want to control traffic flow at the IP address or port level for TCP, UDP, and SCTP protocols,then you might consider using Kubernetes NetworkPolicies for particular applications in your cluster.NetworkPolicies are an application-centric construct which allow you to specify how a pod is allowed to communicate with various network"entities" (we use the word "entity" here to avoid overloading the more common terms such as"endpoints" and "services", which have specific Kubernetes connotations) over the network.NetworkPolicies apply to a connection with a pod on one or both ends, and are not relevant toother connections.

Network policies are implemented by the network plugin.To use network policies, you must be using a networking solution which supports NetworkPolicy.Creating a NetworkPolicy resource without a controller that implements it will have no effect.

Cluster ingress and egress mechanisms often require rewriting the source or destination IPof packets. In cases where this happens, it is not defined whether this happens before orafter NetworkPolicy processing, and the behavior may be different for differentcombinations of network plugin, cloud provider, Service implementation, etc.

When a deny all network policy is defined, it is only guaranteed to deny TCP, UDP and SCTPconnections. For other protocols, such as ARP or ICMP, the behaviour is undefined.The same applies to allow rules: when a specific pod is allowed as ingress source or egress destination,it is undefined what happens with (for example) ICMP packets. Protocols such as ICMP may be allowed by somenetwork plugins and denied by others.

When a new NetworkPolicy object is created, it may take some time for a network pluginto handle the new object. If a pod that is affected by a NetworkPolicyis created before the network plugin has completed NetworkPolicy handling,that pod may be started unprotected, and isolation rules will be applied whenthe NetworkPolicy handling is completed.

Allow rules will be applied eventually after the isolation rules (or may be applied at the same time).In the worst case, a newly created pod may have no network connectivity at all when it is first started, ifisolation rules were already applied, but no allow rules were applied yet.

Therefore, pods must be resilient against being started up with different networkconnectivity than expected. If you need to make sure the pod can reach certain destinationsbefore being started, you can use an init containerto wait for those destinations to be reachable before kubelet starts the app containers.

Every NetworkPolicy will be applied to all selected pods eventually.Because the network plugin may implement NetworkPolicy in a distributed manner,it is possible that pods may see a slightly inconsistent view of network policieswhen the pod is first created, or when pods or policies change.For example, a newly-created pod that is supposed to be able to reach both Pod Aon Node 1 and Pod B on Node 2 may find that it can reach Pod A immediately,but cannot reach Pod B until a few seconds later.

As of Kubernetes 1.29, the following functionality does not exist in theNetworkPolicy API, but you might be able to implement workarounds using Operating Systemcomponents (such as SELinux, OpenVSwitch, IPTables, and so on) or Layer 7 technologies (Ingresscontrollers, Service Mesh implementations) or admission controllers. In case you are new tonetwork security in Kubernetes, its worth noting that the following User Stories cannot (yet) beimplemented using the NetworkPolicy API.

A network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

Computers connected to a network are broadly categorized as servers or workstations. Servers are generally not used by humans directly, but rather run continuously to provide "services" to the other computers (and their human users) on the network. Services provided can include printing and faxing, software hosting, file storage and sharing, messaging, data storage and retrieval, complete access control (security) for the network's resources, and many others.

Workstations are called such because they typically do have a human user which interacts with the network through them. Workstations were traditionally considered a desktop, consisting of a computer, keyboard, display, and mouse, or a laptop, with with integrated keyboard, display, and touchpad. With the advent of the tablet computer, and the touch screen devices such as iPad and iPhone, our definition of workstation is quickly evolving to include those devices, because of their ability to interact with the network and utilize network services.

Servers tend to be more powerful than workstations, although configurations are guided by needs. For example, a group of servers might be located in a secure area, away from humans, and only accessed through the network. In such cases, it would be common for the servers to operate without a dedicated display or keyboard. However, the size and speed of the server's processor(s), hard drive, and main memory might add dramatically to the cost of the system. On the other hand, a workstation might not need as much storage or working memory, but might require an expensive display to accommodate the needs of its user. Every computer on a network should be appropriately configured for its use.

On a single LAN, computers and servers may be connected by cables or wirelessly. Wireless access to a wired network is made possible by wireless access points (WAPs). These WAP devices provide a bridge between computers and networks. A typical WAP might have the theoretical capacity to connect hundreds or even thousands of wireless users to a network, although practical capacity might be far less. ff782bc1db

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