Newly appointed Communications Minister Paul Fletcher says one of his key priorities will be completing the rollout of the national broadband network.

The chief executive of a cyber security firm in Canberra says the announcement of $156 million in funding by Prime Minister Scott Morrison, to bolster cyber security efforts that are in place to guard the country's communications networks, would do little to directly improve the protection of government agencies.

The Coalition Government will pledge $156 million to bolster cyber security efforts that are in place to guard the country's communications networks, with Prime Minister Scott Morrison set to make the pledge on Monday.