Gōngchéngshī zhèngzài tiáoshì yī gè xīn de wǎngluò xiéyì.
The engineer is debugging a new network protocol.
Tips
memory
Built from two transparent compounds: 网络 (wǎngluò) = 'network' (网 net + 络 connect), 协议 (xiéyì) = 'agreement/protocol' (协 cooperate + 议 discuss). Two parties on a network agreeing how to talk.
register
Standard technical term, identical usage to English 'network protocol'. In Taiwan you'll often see 網路協定 (wǎnglù xiédìng) instead — same meaning, different vocabulary.