The regional court in the western city of Cologne said it would suspend the sentence of one year and eight months against the defendant, Daniel Kaye, following pleas to this effect by both prosecutors and the defence.
The 29-year-old last week described as "the worst mistake of my life" the attack that knocked more than one million German households offline in November, carried out for money on behalf of a Liberian client.
He was detained in February at London's Luton airport on a European arrest warrant for attempted computer sabotage and extradited to Germany.
Kaye told the court he was paid USD 10,000 (about 8,500 euros) by a Liberian telecom company which wanted to use the botnet to damage a local rival.
The attack, which the company said caused about two million euros of damage, ended when it advised customers to disconnect their routers and restart them after a software update.
The large-scale strike fuelled concerns over cyber security in Germany and officials have warned that more online assaults are possible ahead of a general election in September.
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