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Computer network engineering is a technology discipline within engineering that deals with the design, implementation, and management of computer networks. These systems contain both physical components, such as routers , switches, cables, and some logical elements, such as protocols and network services .
The physical layer consists of the electronic circuit transmission technologies of a network. [3] It is a fundamental layer underlying the higher level functions in a network, and can be implemented through a great number of different hardware technologies with widely varying characteristics.
As with many technical roles, network administrator positions require a breadth of technical knowledge and the ability to learn the intricacies of new networking and server software packages quickly. Within smaller organizations, the more senior role of network engineer is sometimes attached to the responsibilities of the network administrator.
A NOC engineer has several duties in order to ensure the smooth running of the network. They deal with things such as DDoS attacks, power outages, network failures, and routing black-holes. There are of course the basic roles, such as remote hands, support, configuration of hardware (such as firewalls and routers, purchased by a client).
Here is very important role of L1/L2 router - if it is connected to L2 router in another area, then it sets ATT (ATTached bit) in its L1 LSP. L1 routers which receive this LSP (with ATT bit) add default route to originator of this LSP. This is different from OSPF, where ABR generates default route to stub area routers and sends it via LSA 3.
Network engineering may refer to: Internetworking, service requirements for switched telephone networks; Computer network engineering, the design and management of computer networks; Telecommunications Engineering, developing telecommunications network topologies; Broadcasting, spreading messages to a dispersed audience electronically