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Network performance refers to measures of service quality of a network as seen by the end-user. Network speed is sometimes synonymous with the performance of a network. Bandwidth, latency, jitter are some of the metrics which affect network performance.
To understand the computer networking basics, you need to understand at least a few important things such as computer network architecture, basic building blocks of any computer network, such as routers, network switches, IP address, DNS, etc., different communication models and services.
Network sniffing is a method to monitor & analyze data packets being communicated over a network. It is also called snooping, packet sniffing, network probing, etc. Network sniffing can be done for both ethical & unethical reasons. Some network sniffer software are wireshark, tcpdump, snort, capsa, etc.
NetBIOS is an abbreviation that stands for Network Basic Input Output System. It is an industry standard that facilitates communication between devices on a LAN. It operated on the session layer (Layer 5) of the OSI (Open Systems Interconnection) model. NetBIOS uses ports 137, 138 & 139 for communication