By Lawrence Matheson Cisco Systems, an internet networking pioneer, is set to lay off more than 4,000 employees. This move joins a growing trend among tech companies that has seen profits and stock prices rise, but also highlights the job insecurity in an industry increasingly turning to artificial intelligence. The mass layoffs, announced alongside Cisco’s latest quarterly results, represent about 5% of its global workforce of 84,900. This follows Cisco’s late 2022 cutbacks that saw 5,000 workers let go, and comes before its $28 billion (£22 billion) acquisition of Splunk, which management no…