E-4 and E-5, but not E-3

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Possible Answers: NCOS.

Last seen on: NY Times Crossword 24 Nov 18, Saturday

Random information on the term “NCOS”:

system]] for a network device such as a router, switch or firewall.

Network operating systems can be embedded in a router or hardware firewall that operates the functions in the network layer (layer 3).[Message 1]

Early microcomputer operating systems such as CP/M, DOS and classic Mac OS were designed for one user on one computer. As local area network technology became available, two general approaches to handle sharing arose.

In a peer-to-peer network operating system users are allowed to share resources and files located on their computers and access shared resources from others. This system is not based with having a file server or centralized management source. A peer-to-peer network sets all connected computers equal; they all share the same abilities to use resources available on the network.[3]

The advantages include:

The disadvantages include:

Network operating systems can be based on a client–server model (architecture) in which a server enables multiple clients to share resources.[1]Client-server network operating systems allow networks to centralize functions and applications in one or more dedicated file servers. The server is the center of the system, allowing access to resources and instituting security. The network operating system provides the mechanism to integrate all the components on a network to allow multiple users to simultaneously share the same resources regardless of physical location.[3][4][5[4]]] j

NCOS on Wikipedia